Pre-distortion counteracting and secondary counteracting power amplification circuit

Abstract

The invention provides a pre-distortion counteracting and secondary counteracting power amplification circuit, which is characterized in that an input signal is divided into two paths, one path generates a supporting pre-distortion signal through a supporting distortion extraction and adjustment circuit, and the supporting pre-distortion signal is combined with the other path of main signal to output a supporting pre-distortion power signal; one branch pre-distortion power signal is similarly offset with a branch distortion signal at the output end of the branch power amplification circuit, and a branch distortion offset signal is extracted from the branch power signal with the linearity of-45 dBc to-50 dBc, adjusted and output to the coupling input end of the main branch coupling circuit; the other path of supporting pre-distortion power signal is offset with the main path distortion signal at the output end of the main path power amplification circuit and is output to the main path input end of the main-branch coupling circuit, the two paths of supporting pre-distortion signals at the output end of the main-branch coupling circuit are offset, and the branch distortion signal and the main path distortion signal are similar or are offset in a similar pairing manner; the linearity of the main power amplification circuit is improved to-45 dBc to-50 dBc or above, the efficiency is improved, and the gain linear dynamic range of the C-type main power amplification circuit is expanded.

Description

Technical Field

[0001] The present invention relates to the technical field of signal power amplification, and in particular to a pre-distortion cancellation and secondary cancellation power amplifier circuit. Background Art

[0002] In existing power amplifier circuits, an impedance transformation network combiner circuit or a Doherty combiner circuit is generally used to improve the combined output power and efficiency of the power amplifier circuit. Among them, for the power circuit of the existing power amplifier circuit, when the output power is met, if the overall efficiency is improved, the overall output power linearity is reduced; when the overall output power linearity is improved, the overall power efficiency is further reduced. For the impedance transformation network combination or Doherty combination of the existing power amplifier circuit, when the combined output power is increased, if the overall power efficiency is improved, the overall output power linearity is reduced; when the overall power linearity is improved, the overall power efficiency is further reduced. Therefore, when it is necessary to increase the output power of the power amplifier circuit or the linearity of the combined output power, a pre-distortion circuit is generally connected in series at the input end of the combined power amplifier circuit to improve the linearity of the combined output power.

[0003] Among them, when the pre-distortion circuit improves the linearity of the output power of the power amplifier circuit, it cannot simultaneously expand the gain linear range of the Class C power amplifier circuit, and the pre-distortion circuit improves the linearity of the output power of the Class C power amplifier circuit worse than the linearity of the output power of the Class AB power amplifier circuit; or the existing feedforward cancellation technology improves the linearity of the Class C power amplifier circuit by reducing the efficiency of the Class C power amplifier circuit.

[0004] Therefore, when the output power of the existing power amplifier circuit is increased, the overall power increases linearly but the overall power efficiency decreases, or the overall power efficiency increases but the overall power decreases linearly, which is a problem that cannot be solved at the same time. Summary of the Invention

[0005] The main purpose of the present invention is to provide a power amplifier circuit with predistortion cancellation and secondary cancellation that can not only improve the power efficiency of the whole machine but also improve the power linearity of the whole machine and expand the gain linear dynamic range of the whole machine C class power amplifier circuit.

[0006] The technical solution adopted in the present invention is: Provided is a predistortion cancellation and secondary cancellation power amplifier circuit, wherein an input signal passes through two output terminals of a branch circuit, and a predistortion signal output by a branch distortion extraction and adjustment circuit and a power signal output by a branch signal adjustment circuit through one of the output terminals of the branch circuit are respectively connected to two input terminals of a corresponding branch combining circuit; The branch power signal and the branch predistortion signal in the branch predistortion power signal are combined and output at the output end of the branch combining circuit, and are transmitted to the output end of the branch power amplifier circuit through one of the output ends of the main branch shunt circuit, thereby achieving synchronous branch predistortion cancellation of the branch predistortion signal in the branch predistortion power signal and the branch distortion signal in the branch power signal output by the branch power amplifier circuit. The generated branch power signal and the branch predistortion cancellation signal with a linearity of more than -45 to -50 dBc are output through the branch attenuation circuit, or are transmitted through the main path of the branch coupling circuit to the branch absorbing load, and then output through the coupling end of the branch coupling circuit. The branch power signal is transmitted through the output end of the branch signal adjustment circuit through the second output end of the branch shunt circuit to the output of the branch adjustment circuit, and then respectively reaches the two input ends of the branch combining circuit. The two branch power signals are cancelled at the output end of the branch combining circuit, and the branch predistortion cancellation signal is extracted. At the output end of the branch combining circuit, the support power signal and the support predistortion signal in the support predistortion power signal are combined and output, and the support predistortion signal in the support predistortion power signal is output to the output end of the main power amplifier circuit through the second output end of the main branch branch circuit to realize the main predistortion cancellation of the support predistortion signal in the support predistortion power signal and the main distortion signal in the main power signal output by the main power amplifier circuit. The formed main power signal and main predistortion cancellation signal are output to the main path input end of the main branch coupling circuit, and the branch predistortion cancellation signal extracted at the output end of the branch combining circuit is output to the main branch coupling circuit through the branch distortion cancellation adjustment circuit. The coupling input end realizes two-way identical cancellation of the branch pre-distortion signal in the branch pre-distortion power signal outputted by the branch combiner circuit at the main path output end of the main branch coupling circuit, and realizes similar cancellation or paired similar cancellation of the branch distortion signal in the output of the branch power amplifier circuit and the main distortion signal in the output of the main power amplifier circuit, thereby forming a power amplifier circuit with pre-distortion cancellation and secondary cancellation, improving the linearity of the main power signal outputted by the main power amplifier circuit to above -45~-50dBc and improving the efficiency, and extending the dynamic range of the gain linearity of the Class C main power amplifier circuit.

[0007] Preferably, the offset distortion extraction and adjustment circuit includes: transmitting the offset power signal and the offset predistortion signal in the offset predistortion power signal output by the offset power amplifier circuit to the output end of the offset attenuation circuit through the two output ends of the offset branch circuit, or transmitting the offset power signal and the offset predistortion signal in the offset predistortion power signal output by the offset power amplifier circuit to the output end of the offset attenuation circuit through the main path of the offset coupling circuit, outputting the offset power signal through the coupling end of the offset coupling circuit, and transmitting the offset power signal output by the offset adjustment circuit to the two input ends of the offset combining circuit respectively; when the offset power signal in the offset predistortion power signal output by the offset power amplifier circuit and the offset power signal output by the offset adjustment circuit have equal or similar time delays, equal or similar amplitudes, and opposite or nearly opposite phases at the output end of the offset combining circuit, the two offset power signals are offset, and the offset predistortion signal in the offset predistortion power signal output by the offset power amplifier circuit is extracted and output through the offset distortion adjustment circuit to form the offset distortion extraction and adjustment circuit.

[0008] Preferably, in the offset distortion extraction and adjustment circuit, the offset power amplifier circuit is composed of an offset similarity power amplifier circuit, or a small signal power amplifier circuit connected in series with the offset similarity power amplifier circuit, wherein the offset similarity power amplifier circuit is composed of multiple power amplifier circuits connected in series, or / and multiple power amplifier circuits connected in parallel, and the power amplifier circuit includes a class A, class B, class C, class AB or Doherty power amplifier circuit; The output combining circuit of the multiple power amplifier circuits connected in parallel includes a power combining circuit, an impedance conversion network combining circuit and a Doherty combining circuit, which output the supporting power signal and the supporting predistortion signal in the supporting power amplifier circuit; The small signal power amplifier circuit in the supporting power amplifier circuit is similar to the small signal power amplifier circuit in the branch power amplifier circuit; and the output power of the supporting similar power amplifier circuit in the supporting power amplifier circuit is less than or equal to the output power of the branch similar power amplifier circuit in the branch power amplifier circuit; When the support distortion extraction and adjustment circuit is a support analog distortion extraction and adjustment circuit, the support power amplifier circuit is composed of a support similar analog power amplifier circuit, or is composed of a small signal power amplifier circuit connected in series with a support similar analog power amplifier circuit, wherein the support similar analog power amplifier circuit is composed of multiple stages of analog power amplifier circuits connected in series, or / and multiple analog power amplifier circuits connected in parallel to form a support similar analog power amplifier circuit, the analog power amplifier circuit includes a Class A, Class B, Class C, Class AB or Doherty power amplifier circuit, the output combining circuit of the multiple analog power amplifier circuits connected in parallel includes a power combining circuit, an impedance transformation network combining circuit and a Doherty combining circuit, and the circuit outputs a support power signal and a support analog predistortion signal in the support predistortion power signal; Alternatively, when the branch distortion extraction and adjustment circuit is a branch analog-to-digital distortion extraction and adjustment circuit, the branch power amplifier circuit is composed of an A / D analog-to-digital conversion circuit, a digital predistortion circuit, a D / A digital-to-analog conversion circuit, and a low-power amplifier circuit to form a branch analog-to-digital predistortion amplifier circuit. Simultaneously, a feedback coupling circuit is added between the output end of the branch power amplifier circuit and the main path input end of the branch coupling circuit. The coupling output end of the feedback coupling circuit is connected to the input end of the newly added feedback sampling circuit. The output end of the feedback sampling circuit is connected to the feedback sampling input end of the branch analog-to-digital predistortion amplifier circuit. Furthermore, the branch analog-to-digital predistortion amplifier circuit outputs a branch power signal and a branch analog-to-digital predistortion signal from the branch power amplifier circuit. Alternatively, when the branch distortion extraction and adjustment circuit is a branch digital distortion extraction and adjustment circuit, the branch power amplifier circuit is composed of a digital predistortion circuit to a D / A digital-to-analog conversion circuit via a low-power amplifier circuit to form a branch digital predistortion amplifier circuit. Simultaneously, a feedback coupling circuit is added between the output end of the branch power amplifier circuit and the main path input end of the branch coupling circuit. The coupling output end of the feedback coupling circuit is connected to the input end of the newly added feedback sampling circuit. The output end of the feedback sampling circuit is connected to the feedback sampling input end of the branch analog digital predistortion amplifier circuit. Furthermore, the circuit outputs a branch power signal and a branch digital predistortion signal from the branch digital predistortion power signal. Among them, at the output end of the branch power amplifier circuit, the branch predistortion signal in the branch predistortion power signal output by the branch power amplifier circuit is similar or paired similar and time-delay synchronized with the branch distortion signal in the branch power signal output by the branch power amplifier circuit, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby achieving synchronous branch predistortion similarity or paired similarity cancellation, and forming a branch predistortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc.

[0009] The branch distortion signal in the branch power signal output by the branch power amplifier circuit and the offset predistortion signal in the offset predistortion power signal output by the offset power amplifier circuit are similarly canceled in pairing as follows: the number of paired final-stage parallel circuits in the offset power amplifier circuit is equal to the number of final-stage parallel circuits in the branch power amplifier circuit, and the offset predistortion signal output by one of the final-stage parallel circuits in each pair of the offset power amplifier circuits and the branch distortion signal output by one of the final-stage parallel circuits in the branch power amplifier circuit are similarly canceled in pairing or similarly canceled in pairing, and the linearity of the branch power signal output by the branch power amplifier circuit is improved to above -45 to -50 dBc. Preferably, in the offset distortion extraction and adjustment circuit, the offset adjustment circuit is composed of an offset main signal power amplifier circuit, a delay adjustment circuit, and an offset main signal amplitude modulation and phase modulation amplifier circuit connected in series; When the support power amplifier circuit is a support analog power amplifier circuit, the support adjustment circuit is composed of a support analog main signal power amplifier circuit, an analog delay adjustment circuit, and a support main signal analog amplitude modulation and phase modulation amplifier circuit connected in series to form a support analog adjustment circuit, and the circuit outputs a support power signal; Alternatively, when the support power amplifier circuit is a support analog-digital predistortion amplifier circuit, the support adjustment circuit is composed of an A / D analog-to-digital conversion circuit, a digital delay circuit, a D / A digital-to-analog conversion circuit, and a low-power amplifier circuit to form a support analog-to-digital adjustment circuit, and the circuit outputs a support power signal; Alternatively, when the support power amplifier circuit is a support digital pre-distortion amplifier circuit, the support adjustment circuit is composed of a digital delay adjustment circuit, a D / A digital-to-analog conversion circuit, and a low-power amplifier circuit to form a support digital adjustment circuit, and the circuit outputs a support power signal. The branch circuit is changed into a branch digital branch circuit, and an additional A / D analog-to-digital conversion circuit is installed between one output end of the branch circuit and the input end of the branch digital branch circuit, or additional A / D analog-to-digital conversion circuits are installed between two output ends of the branch circuit and the input end of the support digital pre-distortion amplifier circuit and between the output end of the branch digital adjustment circuit respectively. Wherein, from the input end of the branch loss splitting circuit to the output end of the branch loss combining circuit, when the offset power signal in the offset predistortion power signal output by the offset power amplifying circuit and the offset power signal output by the offset adjustment circuit have equal or similar time delays, equal or similar amplitudes, and opposite or nearly opposite phases, the two offset power signals are canceled out, and the offset predistortion signal in the offset predistortion power signal output by the offset power amplifying circuit is extracted and outputted by the offset distortion adjustment circuit to form an offset analog distortion extraction adjustment circuit, or an offset analog-digital distortion extraction adjustment circuit, or an offset digital distortion extraction adjustment circuit in the offset distortion extraction and adjustment circuit; Among them, at the output end of the branch power amplifier circuit, the branch pre-distortion signal output by the branch distortion extraction and adjustment circuit is similar to the branch distortion signal in the branch power signal output by the branch power amplifier circuit or is paired similarly and time-delayed synchronously, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch pre-distortion cancellation and forming a branch pre-distortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc.

[0010] Preferably, the support signal adjustment circuit is composed of a support delay adjustment circuit and a support signal amplitude modulation and phase modulation amplification circuit connected in series; When the offset distortion extraction and adjustment circuit is an offset analog distortion extraction and adjustment circuit, the offset signal adjustment circuit is composed of an offset analog delay adjustment circuit and an offset analog signal amplitude modulation and phase modulation amplification circuit connected in series to form an offset analog signal adjustment circuit, and the circuit outputs an offset power signal; Alternatively, when the offset distortion extraction and adjustment circuit is an offset analog-to-digital distortion extraction and adjustment circuit, the offset signal adjustment circuit is composed of an A / D analog-to-digital conversion circuit, a digital delay circuit, a D / A digital-to-analog conversion circuit, and an amplitude modulation and phase modulation amplification circuit in series to form an offset analog-to-digital signal adjustment circuit, and the circuit outputs an offset power signal; Alternatively, when the offset distortion extraction and adjustment circuit is a offset digital distortion extraction and adjustment circuit, the offset signal adjustment circuit is composed of a digital delay adjustment circuit, a D / A digital-to-analog conversion circuit, and an amplitude modulation and phase modulation amplification circuit connected in series to form an offset digital signal adjustment circuit, and the circuit outputs an offset power signal; wherein an A / D analog-to-digital conversion circuit is added between the input end of the offset digital signal adjustment circuit and one of the output ends of the offset shunt circuit; Wherein, when the time delay of the offset power signal output by the offset signal adjustment circuit and the offset predistortion signal output by the offset distortion extraction adjustment circuit from the input end of the offset branch circuit to the output end of the offset combiner circuit is equal to or similar to that of the offset predistortion signal, the amplitude is equal to or similar to that of the offset signal, and the phase is the same or similar, the offset power signal and the offset predistortion signal in the offset predistortion power signal are combined to output; Among them, at the output end of the branch power amplifier circuit, the branch power signal in the branch predistortion power signal output by the output end of the branch combiner circuit and the branch distortion signal in the branch power signal output by the branch power amplifier circuit are similar or paired similarly and delayed synchronously, and have equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch predistortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc.

[0011] Preferably, in the main path output end from the input end of the main branch shunt circuit to the main branch coupling circuit, when the time delay of the branch power signal and the branch pre-distortion cancellation signal output by the branch power amplifier circuit in the input end of the branch shunt circuit to the output end of the branch combining circuit is equal or similar, the amplitude is equal or similar, and the phase is opposite or nearly opposite, the cancellation of the two branch power signals is achieved, the branch pre-distortion cancellation signal in the output of the branch power amplifier circuit extracted at the output end of the branch combining circuit is transmitted to the coupling input end of the main branch coupling circuit through the branch distortion cancellation adjustment circuit, and the main pre-distortion cancellation signal in the main power signal output through the output end of the main power amplifier circuit is transmitted to the main path input end of the main branch coupling circuit, and in the main path of the main branch coupling circuit At the output end, the branch distortion signal in the output of the branch power amplifier circuit extracted at the output end of the branch combining circuit is similar or paired similar to the main distortion signal in the main power signal output by the main power amplifier circuit, and the offset predistortion signal in the output of the branch power amplifier circuit extracted at the output end of the branch combining circuit is identical to the offset predistortion signal in the output of the main power amplifier circuit. When the time delays are equal or similar, the amplitudes are equal or similar, and the phases are opposite or nearly opposite, at the main path output end of the main branch coupling circuit, two-way identical cancellation of the offset predistortion signal in the offset predistortion power signal output by the output end of the branch combining circuit is achieved, and similar cancellation or paired similar cancellation of the branch distortion signal in the output of the branch power amplifier circuit is achieved with the main distortion signal in the output of the main power amplifier circuit. This improves the linearity of the main power signal output by the main power amplifier circuit to above -45 to -50 dBc, improves the efficiency, and expands the dynamic range of the gain linearity of the Class C main power amplifier circuit.

[0012] Among them, the paired similarity cancellation of the branch distortion signal in the branch power signal output by the branch power amplifier circuit in the main path output end of the main branch coupling circuit and the main distortion signal in the main path main power signal output by the main path power amplifier circuit is as follows: the number of paired final-stage parallel circuits in the branch power amplifier circuit is equal to the number of paired final-stage parallel circuits in the main path power amplifier circuit, and the branch distortion signal in the output of one of the final-stage parallel circuits in each pair of branch power amplifier circuits and the main path distortion signal in the output of one of the final-stage parallel circuits in the main path power amplifier circuit are paired similarity canceled or paired similarity canceled, and the linearity of the main path main power signal output by the main path power amplifier circuit is improved to above -45~-50dBc and the efficiency is improved, and the gain linearity dynamic range of the Class C main path main power amplifier circuit is extended.

[0013] Preferably, the main power amplifier circuit is composed of a main power amplifier circuit, or a small signal power amplifier circuit connected in series with the main power amplifier circuit, wherein the main power amplifier circuit is composed of multiple power amplifier circuits connected in series, or / and multiple power amplifier circuits connected in parallel, and the power amplifier circuit includes a class A, class B, class C, class AB or Doherty power amplifier circuit; The output combining circuit of the multiple power amplifier circuits connected in parallel includes a power combining circuit, an impedance conversion network combining circuit and a Doherty combining circuit, and the main power amplifier circuit outputs a main power signal and a main distortion signal. Among them, at the output end of the main power amplifier circuit, the support predistortion signal in the support predistortion power signal output by the output end of the support combiner circuit and the main distortion signal in the main main power signal output by the main power amplifier circuit are canceled out by the main predistortion, thereby forming a main predistortion cancellation signal in the main main power signal output by the main power amplifier circuit.

[0014] Preferably, the branch power amplifier circuit is composed of a branch similar power amplifier circuit, or a small signal power amplifier circuit connected in series with a branch similar power amplifier circuit, wherein the branch similar power amplifier circuit is composed of multiple power amplifier circuits connected in series, or / and multiple power amplifier circuits connected in parallel, the power amplifier circuit includes a Class A, Class B, Class C or Class AB, or a Doherty circuit, and the branch power amplifier circuit outputs a branch power signal and a branch distortion signal; The output combining circuit of the multiple power amplifier circuits connected in parallel includes a power combining circuit, an impedance conversion network combining circuit and a Doherty combining circuit; The small signal power amplifier circuit in the branch power amplifier circuit is similar to the small signal power amplifier circuit in the main power amplifier circuit; Among them, the output power of the branch power amplifier circuit is much smaller than the output power of the main power amplifier circuit; Among them, in the main path output end from the input end of the main branch shunt circuit to the main branch coupling circuit, the branch distortion signal in the branch power signal output by the branch power amplifier circuit and the main distortion signal in the main power signal output by the main power amplifier circuit are similarly offset or paired similarly offset, and the linearity of the main power signal output by the main power amplifier circuit is improved to above -45~-50dBc.

[0015] Preferably, the branch adjustment circuit is composed of a branch main signal power amplifier circuit and a branch main signal amplitude modulation and phase modulation amplifier circuit connected in series, and the branch adjustment circuit outputs a branch power signal; Among them, when the branch power signal output by the branch adjustment circuit and the branch power signal and the branch pre-distortion cancellation signal output by the branch power amplification circuit have equal or similar time delays, equal or similar amplitudes, and opposite or nearly opposite phases at the output end of the branch combining circuit from the input end of the branch splitting circuit to the output end of the branch combining circuit, the two branch power signals are canceled and the branch pre-distortion cancellation signal in the output of the branch power amplification circuit is extracted. Preferably, the offset distortion adjustment circuit is composed of an offset predistortion power amplifier circuit and an offset predistortion amplitude modulation and phase modulation amplifier circuit connected in series.

[0016] Preferably, the branch distortion cancellation adjustment circuit is composed of a branch distortion power amplifier circuit and a branch distortion amplitude modulation and phase modulation amplifier circuit connected in series; Among them, the output power of the branch distortion cancellation adjustment circuit is inversely proportional to the cancellation value of the branch pre-distortion cancellation signal output by the branch power amplifier circuit or inversely proportional to the linearity of the branch power signal, and is inversely proportional to the linearity of the main power signal output by the main power amplifier circuit, and is directly proportional to the coupling degree of the main-branch coupling circuit.

[0017] Preferably, the branch-loss shunt circuit, the branch-loss shunt circuit, the branch shunt circuit, and the main branch shunt circuit are shunt circuits simulating equal-power shunt circuits, unequal-power shunt circuits, or unequal-power coupling circuits; The branch-loss digital shunt circuit is a shunt circuit of a digital equal-power shunt circuit, a digital unequal-power shunt circuit, or a digital unequal-power coupling circuit.

[0018] Preferably, the branch-combining circuit, the branch-loss combining circuit, and the branch combining circuit include power combining circuits of equal power, unequal power, and combining circuits of unequal power coupling circuits.

[0019] Preferably, the main path of the main branch coupling circuit is a high-power main path circuit, and the coupling degree of the main branch coupling circuit is directly proportional to the cancellation value of the branch pre-distortion cancellation signal output by the branch power amplifier circuit within a certain range of -40dBc to -50dBc or above, or is directly proportional to the linearity of the branch power signal within a certain range of -40~-50dBc or above, and the insertion loss of the main path of the main branch coupling circuit is inversely proportional to the linearity of the branch power signal output by the branch power amplifier circuit within a certain range of -40~-50dBc or above. Preferably, the support coupling circuit, the branch coupling circuit, and the feedback coupling circuit include a microstrip coupling circuit and a separation coupling circuit; Or the rated power of the support attenuation circuit should be greater than the power loss determined by the support power signal output by the support power amplifier circuit passing through the attenuation range of the support attenuation circuit; The rated power of the branch attenuation circuit should be greater than the power loss determined by the branch power signal output by the branch power amplifier circuit passing through the attenuation range of the branch attenuation circuit; The support attenuation circuit and the branch attenuation circuit include an attenuation circuit composed of a π-type circuit and an impedance network or a band-stop network circuit.

[0020] Preferably, the branch absorption load should be greater than the power of the branch power signal output by the branch power amplifier circuit, the rated power of the branch absorption load should be greater than the power of the branch power signal output by the branch power amplifier circuit, and good heat dissipation should be maintained.

[0021] The beneficial effects of the present invention are as follows: the present invention improves the linearity of the main power signal output by the main power amplifier circuit to above -45--50dBc by achieving a similar cancellation value or a paired similar cancellation value between the input end of the main branch shunt circuit and the main path output end of the main branch coupling circuit, and the branch distortion signal in the branch power signal output by the branch power amplifier circuit and the main distortion signal in the main power signal output by the main power amplifier circuit. The branch power signal and the branch predistortion signal in the combined output of the combiner circuit output end, or the branch predistortion signal output by the branch distortion extraction and adjustment circuit, are similar or paired with the branch distortion signal in the branch power signal output by the branch power amplifier circuit at the output end of the branch power amplifier circuit, and are synchronized in time delay, and have equal or similar amplitudes and opposite or nearly opposite phases, thereby achieving synchronous branch predistortion cancellation and forming a branch predistortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc. Between the input end of the main branch splitting circuit and the main path output end of the main branch coupling circuit, the branch distortion signal extracted from the output of the branch power amplifier circuit at the output end of the branch combining circuit is similar or paired similar to the main distortion signal in the output of the main power amplifier circuit, and the support pre-distortion signal extracted from the output end of the branch combining circuit is identical to the support pre-distortion signal in the output of the main power amplifier circuit. When the time delays are equal or similar, the amplitudes are equal or similar, and the phases are opposite or nearly opposite, at the main path output end of the main branch coupling circuit, two-way identical cancellation of the support pre-distortion signal in the combined output of the support pre-distortion power signal at the output end of the branch combining circuit is achieved, and similar cancellation or paired similar cancellation of the branch distortion signal in the output of the branch power amplifier circuit is achieved with the main distortion signal in the output of the main power amplifier circuit. This improves the linearity of the main power signal output by the main power amplifier circuit to above -45 to -50 dBc, improves efficiency, and expands the dynamic range of the gain linearity of the Class C main power amplifier circuit. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 1 is a schematic diagram of the basic circuit structure of the pre-distortion cancellation and secondary cancellation power amplifier circuit according to the first embodiment of the present invention; Figure 2 1 is a schematic structural diagram of a support distortion extraction and adjustment circuit in a pre-distortion cancellation and secondary cancellation power amplifier circuit according to a first embodiment of the present invention; Figure 3 1. It is a circuit structure diagram of a case where the offset distortion extraction and adjustment circuit in the pre-distortion cancellation and secondary cancellation power amplifier circuit of the first embodiment of the present invention is an offset analog distortion extraction and adjustment circuit; Figure 4 1. It is a circuit structure diagram of the front series-connected small signal analog similar main input combining circuit in the predistortion cancellation and secondary cancellation power amplifier circuit of the first embodiment of the present invention; Figure 5 It is a structural diagram of a small-signal analog similar main input combined signal extraction and adjustment circuit in a circuit of a small-signal analog similar main input combined circuit connected in series in a predistortion cancellation and secondary cancellation power amplifier circuit in a first embodiment of the present invention; Figure 6 This is a schematic diagram of a circuit structure in which the predistortion cancellation and secondary cancellation power amplifier circuit cooperates with an envelope tracking circuit to further improve efficiency according to the first embodiment of the present invention; Figure 7 This is a schematic diagram of a circuit structure in which a feedforward cancellation circuit is connected in series at the output end of a predistortion cancellation and secondary cancellation power amplifier circuit according to the first embodiment of the present invention to further improve linearity; Figure 8 It is a circuit structure diagram of a second embodiment of the present invention in which the support distortion extraction and adjustment circuit in the pre-distortion cancellation and secondary cancellation power amplifier circuit is a support digital distortion extraction and adjustment circuit. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] It should be noted that the diagrams provided in the embodiments of the present application only schematically illustrate the basic concepts of the present application, and thus only the components related to the present application are shown in the diagrams, rather than being drawn according to the number, shape and size of the components in actual implementation, the type, number and ratio of the components in actual implementation can be arbitrarily changed, and the component layout type can be more complex.

[0025] In the present application, it should be further noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like appear, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and thus cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be understood as limiting the present application. In addition, if the terms "first", "second" appear, they are only for description and differentiation purposes, and cannot be understood as indicating or implying relative importance.

[0026] In addition, it should be further noted that the features of various embodiments of the present application can be combined or integrated partially or entirely, and can interact and operate in different ways as understood by those skilled in the art. Each embodiment can be implemented independently of each other, or in an associated relationship.

[0027] Embodiment 1 As Figure 1 the circuit structure of the distortion extraction adjustment circuit in the pre-distortion cancellation and secondary cancellation power amplification circuit of the present application is shown as the circuit shown in Figure 2 .

[0028] Among them, Figure 1 is a basic circuit structure diagram of the pre-distortion cancellation and secondary cancellation power amplification circuit of the present application, which is composed of branch cancellation circuit, distortion extraction adjustment circuit, branch signal adjustment circuit, branch branch circuit, branch combination circuit, main branch branch circuit, branch power amplification circuit, branch coupling circuit, branch absorption load, branch adjustment circuit, branch combination circuit, branch distortion cancellation adjustment circuit, main branch power amplification circuit, branch coupling circuit; Specifically, the input signal is connected to two output ends of the branch cancellation circuit, and the branch pre-distortion signal output by the distortion extraction adjustment circuit and the branch power signal output by the branch signal adjustment circuit through one of the output ends of the branch branch circuit are connected to two input ends of the branch combination circuit, respectively. The branch power signal and the branch predistortion signal in the branch predistortion power signal are combined and output at the output end of the branch combining circuit, and are transmitted to the output end of the branch power amplifier circuit through one of the output ends of the main branch shunt circuit, thereby achieving synchronous branch predistortion cancellation of the branch power signal in the branch predistortion power signal and the branch distortion signal in the branch power signal output by the branch power amplifier circuit. The generated branch power signal and the branch predistortion cancellation signal have a linearity of more than -45 to -50 dBc, and are output through the branch attenuation circuit, or through the main path of the branch coupling circuit to the branch absorbing load, and then output through the coupling end of the branch coupling circuit. The branch power signal is transmitted through the output end of the branch signal adjustment circuit through the second output end of the branch shunt circuit to the output of the branch adjustment circuit, and respectively to the two input ends of the branch combining circuit. The two branch power signals are cancelled at the output end of the branch combining circuit to extract the branch predistortion cancellation signal. At the output end of the branch combining circuit, the support power signal and the support predistortion signal in the support predistortion power signal are combined and output, and the support predistortion signal in the support predistortion power signal is output to the output end of the main power amplifier circuit through the second output end of the main branch branch circuit to realize the main predistortion cancellation of the support predistortion signal in the support predistortion power signal and the main distortion signal in the main power signal output by the main power amplifier circuit. The formed main power signal and main predistortion cancellation signal are output to the main path input end of the main branch coupling circuit, and the branch predistortion cancellation signal extracted at the output end of the branch combining circuit is output to the main branch coupling circuit through the branch distortion cancellation adjustment circuit. The coupling input end realizes two-way identical cancellation of the branch pre-distortion signal in the branch pre-distortion power signal outputted by the branch combiner circuit at the main path output end of the main branch coupling circuit, and realizes similar cancellation or paired similar cancellation of the branch distortion signal in the output of the branch power amplifier circuit and the main distortion signal in the output of the main power amplifier circuit, thereby forming a power amplifier circuit with pre-distortion cancellation and secondary cancellation, improving the linearity of the main power signal outputted by the main power amplifier circuit to above -45~-50dBc and improving the efficiency, and extending the dynamic range of the gain linearity of the Class C main power amplifier circuit.

[0029] in, Figure 2 This is a circuit structure diagram of the branch distortion extraction and adjustment circuit in the pre-distortion cancellation and secondary cancellation power amplifier circuit of the present invention. The circuit consists of a branch distortion branch circuit, a branch distortion power amplifier circuit, a branch distortion adjustment circuit, a branch distortion combining circuit, a branch distortion coupling circuit, a branch distortion absorption load, and a branch distortion adjustment circuit. Specifically, the offset power signal and the offset predistortion signal in the offset predistortion power signal output by the offset power amplifier circuit are respectively transmitted through the two output ends of the branch loss division circuit to the output end of the offset attenuation circuit, or through the main path of the offset coupling circuit to the offset absorption load, output through the coupling end of the offset coupling circuit, and the offset power signal output by the offset adjustment circuit are respectively transmitted to the two input ends of the branch loss combination circuit. When the time delay of the offset power signal in the offset predistortion power signal output by the offset power amplifier circuit and the offset power signal output by the offset adjustment circuit at the output end of the branch loss combination circuit are equal or similar, the amplitude is equal or similar, and the phase is opposite or nearly opposite, the two offset power signals are offset, and the offset predistortion signal in the offset predistortion power signal output by the offset power amplifier circuit is extracted and output through the offset distortion adjustment circuit to form a offset distortion extraction and adjustment circuit.

[0030] A specific circuit structure diagram of a pre-distortion cancellation and secondary cancellation power amplifier circuit of this embodiment is shown in FIG. Figure 3 As shown, specifically including: Branch shunt circuit, branch analog distortion extraction adjustment circuit, branch analog signal adjustment circuit, branch shunt circuit, branch combining circuit, main branch shunt circuit, branch power amplifier circuit, branch coupling circuit, branch absorbing load, branch adjustment circuit, branch combining circuit, branch distortion cancellation adjustment circuit, main power amplifier circuit, main branch coupling circuit; Specifically, the analog distortion extraction and adjustment circuit is composed of a branch circuit, an analog power amplifier circuit, an analog adjustment circuit, a coupling circuit, an absorption load, a combining circuit, and a distortion adjustment circuit. in Figure 1 The support distortion extraction and adjustment circuit in Figure 2 The support analog distortion extraction and adjustment circuit in the support distortion extraction and adjustment circuit is formed by the support power amplifier circuit being a support analog power amplifier circuit and the support adjustment circuit being a support analog adjustment circuit. Figure 3 The support analog distortion extraction adjustment circuit in.

[0031] Among them, this embodiment Figure 3The main power amplifier circuit is composed of a main power amplifier circuit connected in series with a small signal power amplifier circuit. The final power amplifier circuit in the main power amplifier circuit is composed of a single power amplifier circuit to form a single main power amplifier circuit, or multiple main power amplifier circuits are composed of multiple main power amplifier circuits through Doherty combining. The power amplifier tubes in the single or multiple final power amplifier circuits include MOS tubes, LDMOS power amplifier tubes, gallium nitride power amplifier tubes, gallium arsenide power amplifier tubes, etc. The rated output power meets the output power requirement of a pre-distortion cancellation and secondary cancellation power amplifier circuit. The gate voltage of the single or multiple final power amplifier tubes is adjusted to make the output rated power of the single or multiple final power amplifier circuits in a Class C working state, thereby forming a Class C single or multiple main power amplifier circuit, and forming a Class C main single or multiple power amplifier circuit.

[0032] The small signal power amplifier circuit connected in series with the input end of the class C single-channel or multi-channel main power amplifier circuit in the class C main single-channel or multi-channel power amplifier circuit is an input in-phase combining compensation small signal power amplifier circuit, wherein the input in-phase combining compensation small signal power amplifier circuit is constructed as follows: In this embodiment, as shown in the attached Figure 4 As shown, the input signal passes through the two output ends of the input compensation shunt circuit, and respectively outputs a distortion signal with input in-phase combiner compensation and an input combined power signal output by the input combined signal adjustment circuit through the input in-phase combiner compensation distortion extraction adjustment circuit, and is respectively connected to the two input ends of the corresponding input compensation combiner circuit. When the time delay of the input in-phase combiner compensation distortion signal and the input combined power signal at the output end of the input compensation combiner circuit are equal or similar, the amplitude is equal or similar, and the phase is equal or similar, the input combined power signal and the distortion signal of the input in-phase combiner compensation in the input in-phase combiner compensation distortion power signal are combined to form an input in-phase combiner compensation small signal power amplifier circuit.

[0033] In this embodiment, as shown in the attached Figure 5As shown, the input combined power signal and the input combined distortion compensation power signal in the input in-phase combined compensation power signal output by the input in-phase combined power amplifier circuit are respectively transmitted to the output end of the input combining attenuation circuit through the two output ends of the compensation distortion branch circuit, or are transmitted to the input combining absorption load through the main path of the input combining coupling circuit, and the input combined power signal output by the input combining adjustment circuit are respectively transmitted to the two input ends of the compensation distortion combining circuit correspondingly, and are output at the output of the compensation distortion combining circuit. When the time delays of the input combined power signal in the input in-phase combined compensation distortion power signal output by the input in-phase combined power amplifier circuit and the input combined power signal output by the input combined adjustment circuit are equal or similar, the amplitudes are equal or similar, and the phases are opposite or nearly opposite, the two input combined power signals are canceled out, and the input in-phase combined compensation distortion signal in the input in-phase combined compensation distortion power signal output by the input in-phase combined power amplifier circuit is extracted and output by the input in-phase combined compensation distortion adjustment amplifier circuit to form an input in-phase combined compensation distortion extraction and adjustment circuit; Wherein, at the output end of the C main single-channel or multi-channel power amplifier circuit composed of a C main single-channel or multi-channel main power amplifier circuit connected in series with an input in-phase combiner compensation small signal power amplifier circuit, when the input in-phase compensation distortion power signal output by the input in-phase combiner compensation small signal power amplifier circuit is synchronized with the input combiner synchronization power point in the C main power signal output by the C main single-channel or multi-channel main power amplifier circuit, the amplitude is equal or close, and the phase is the same or close, the input in-phase combiner compensation distortion power signal output by the input in-phase combiner compensation small signal power amplifier circuit is synchronized with the input combiner synchronization power point ... The invention discloses a method for improving the gain linear dynamic range of the Class C main power signal output by the Class C single-channel or multi-channel main power amplifier circuit, which is less than the input combined synchronous power point, and the compensation is extended to a smaller output main power signal, and the EVM value and gain fluctuation are improved within the gain linear dynamic range of the output Class C main power signal that has been extended to a smaller value, thereby improving the gain linear dynamic range of the Class C main power signal of the Class C main single-channel or multi-channel power amplifier circuit, and improving the linearity of the Class C main power signal to above 30~35dBc.

[0034] Among them, this embodiment Figure 3The middle branch power amplifier circuit is composed of a branch similar power amplifier circuit connected in series with a small signal power amplifier circuit, wherein the single-channel or multi-channel final-stage power amplifier circuit in the branch similar power amplifier circuit is selected from the same type of MOS power amplifier tube, LDMOS power amplifier tube, gallium nitride, gallium arsenide power amplifier tube, etc. as the single-channel or multi-channel final-stage power amplifier circuit selected in the main power amplifier circuit, and has similar characteristics and models, and the output power of the single-channel or multi-channel final-stage power amplifier circuit of the branch similar power amplifier circuit is much smaller than the output power of the single-channel or multi-channel final-stage power amplifier circuit of the main power amplifier circuit in the main power amplifier circuit, wherein the output rated power of the single-channel or multi-channel final-stage power amplifier circuit is in a Class C working state by adjusting the gate voltage of the single-channel or multi-channel final-stage power amplifier tube of the branch similar power amplifier circuit, thereby forming a Class C single-channel or multi-channel branch similar power amplifier circuit, and forming a Class C branch single-channel or multi-channel power amplifier circuit; Wherein, the Class C branch multi-channel power amplifier circuit and the Class C main multi-channel power amplifier circuit in the branch power amplifier circuit are paired at the main path output end of the main branch coupling circuit, the number of final-stage parallel circuits in the branch power amplifier circuit is equal to the number of final-stage parallel circuits in the main power amplifier circuit, and the branch distortion signal outputted by one of the final-stage parallel circuits in each pair of branch power amplifier circuits and the main distortion signal outputted by one of the final-stage parallel circuits in the main power amplifier circuit are similarly canceled or similarly canceled in pair, and the linearity of the main power signal outputted by the main power amplifier circuit is improved to above -45 to -50 dBc and the efficiency is improved, and the gain linear dynamic range of the Class C main power amplifier circuit is extended; Among them, the small signal power amplifier circuit connected in series at the input end of the similar power amplifier circuit of the class C branch single-channel or multi-channel power amplifier circuit is the same as or similar to the input in-phase combining compensation small signal power amplifier circuit connected in series in the class C main single-channel or multi-channel power amplifier circuit, and the output power is equal or similar.

[0035] Among them, at the output end of the C-type branch single-channel or multi-channel power amplifier circuit composed of a C-type single-channel or multi-channel branch similar power amplifier circuit connected in series with an input in-phase combining compensation small signal power amplifier circuit, when the input in-phase compensation distortion power signal output by the input in-phase combining compensation small signal power amplifier circuit is synchronized with the input combining synchronization power point in the C-type branch power signal output by the C-type single-channel or multi-channel branch similar power amplifier circuit, the amplitude is equal or close, and the phase is the same or close, the input in-phase combining compensation small signal power amplifier circuit outputs a power signal with input in-phase. Combined compensation distorted signal, compensates for the gain linear dynamic range of the Class C branch power signal output by the Class C branch single-channel or multi-channel power amplifier circuit that is smaller than the Class C branch power signal at the input combined synchronous power point, and expands to a smaller output main power signal, and improves the EVM value and gain fluctuation within the gain linear dynamic range of the output branch power signal that has been expanded to a smaller one, improves the gain linear dynamic range of the Class C branch main power signal of the Class C branch single-channel or multi-channel power amplifier circuit, and improves the linearity of the Class C branch main power signal to above 30~35dBc.

[0036] Among them, in the main path output end from the input end of the main branch shunt circuit to the main branch coupling circuit, the branch distortion signal in the branch power signal output by the branch power amplifier circuit is similar to or paired with the main distortion signal in the main main power signal output by the main power amplifier circuit, and the linearity of the main main power signal output by the main power amplifier circuit is improved to above -45~-50dBc and the efficiency is improved, and the gain linear dynamic range of the Class C main power amplifier circuit is expanded.

[0037] Among them, or this embodiment Figure 3The branch resistance analog power amplifier circuit is composed of branch resistance similar analog power amplifier circuits or branch resistance similar analog power amplifier circuits in series with small signal power amplifier circuits. The single-channel or multi-channel final power amplifier circuits in the branch resistance similar analog power amplifier circuits select single-channel or multi-channel power amplifier circuits selected from the single-channel or multi-channel final power amplifier circuits in the branch resistance similar power amplifier circuits. The selected MOS power amplifier tubes, LDMOS power amplifier tubes, gallium nitride, gallium arsenide power amplifier tubes, etc. are of the same type and have similar characteristics. The output power of the single-channel or multi-channel final power amplifier circuits in the branch resistance similar analog power amplifier circuits is similar to the output power of the single-channel or multi-channel final power amplifier circuits in the branch resistance similar power amplifier circuits. By adjusting the gate voltage of the single-channel or multi-channel final power amplifier tubes in the branch resistance similar analog power amplifier circuits to make the single-channel or multi-channel final power amplifier circuits in the C-class working state, the output rated power of the single-channel or multi-channel branch resistance similar analog power amplifier circuits is formed, and the C-class single-channel or multi-channel branch resistance similar analog power amplifier circuits are composed. The C-class branch resistance multi-channel similar analog power amplifier circuits in the branch resistance power amplifier circuit and the C-class branch resistance similar multi-channel power amplifier circuit in the branch power amplifier circuit are at the output end of the branch power amplifier circuit. The number of final parallel circuits in the branch resistance similar analog power amplifier circuit is equal to the number of final parallel circuits in the branch resistance similar power amplifier circuit. The branch resistance analog predistortion signal in the output of one of the final parallel circuits in the branch resistance similar analog power amplifier circuit and the branch distortion signal in the output of one of the final parallel circuits in the branch resistance similar power amplifier circuit are paired and similar to each other, and the linearity of the branch power signal output by the branch power amplifier circuit is improved to more than -45~ -50dBc. The input end of the C-class single-channel or multi-channel branch resistance similar analog power amplifier circuit in the C-class branch resistance single-channel or multi-channel analog power amplifier circuit is in series with the small signal power amplifier circuit, which is the same as or similar to the input in-phase branch compensation small signal power amplifier circuit in the C-class branch single-channel or multi-channel power amplifier circuit, and the output power is equal or similar.

[0038] Among them, at the output end of the C-type single-channel or multi-channel analog power amplifier circuit composed of a C-type single-channel or multi-channel analog power amplifier circuit connected in series with an input in-phase combiner compensation small signal power amplifier circuit, when the input in-phase compensation distortion power signal output by the input in-phase combiner compensation small signal power amplifier circuit is synchronized with the input combiner synchronization power point in the C-type support power signal output by the C-type single-channel or multi-channel analog power amplifier circuit, the amplitude is equal or close, and the phase is the same or close, the input in-phase combiner compensation small signal power amplifier circuit outputs a power signal with input in-phase combination. The invention can compensate for the distortion signal of the Class C support power signal output by the Class C support single-channel or multi-channel analog power amplifier circuit, and compensate for the gain linear dynamic range of the Class C support power signal that is smaller than the Class C support power signal at the input combined synchronous power point, and expand it to a smaller output support power signal, and improve the EVM value and gain fluctuation within the gain linear dynamic range of the output support power signal that has been expanded to a smaller output support power signal, thereby improving the gain linear dynamic range of the Class C support main power signal of the Class C support single-channel or multi-channel analog power amplifier circuit, and improving the linearity of the Class C support main power signal to above 30~35dBc.

[0039] Among them, at the output end of the branch power amplifier circuit, the branch analog predistortion signal in the branch predistortion power signal output by the branch analog power amplifier circuit is similar or paired similarly and time-delayed synchronously with the branch distortion signal in the branch power signal output by the branch power amplifier circuit, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch predistortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc.

[0040] The analog adjustment circuit is composed of a series connection of an analog main signal power amplifier circuit, an analog delay adjustment circuit, and an analog amplitude modulation and phase modulation amplifier circuit for the main signal, and the circuit outputs an analog power signal. Wherein, from the input end of the branch loss splitting circuit to the output end of the branch loss combining circuit, when the offset power signal in the offset predistortion power signal output by the offset analog power amplifying circuit has the same or similar time delay, the same or similar amplitude, and the opposite or nearly opposite phase as the offset power signal output by the offset analog adjustment circuit, the two offset power signals are canceled, and the offset analog predistortion signal in the offset analog predistortion power signal output by the offset analog power amplifying circuit is extracted and outputted by the offset distortion adjustment circuit to form the offset analog distortion extraction and adjustment circuit in the offset distortion extraction and adjustment circuit; The analog signal adjustment circuit is composed of an analog delay adjustment circuit and an analog signal amplitude modulation and phase modulation amplifier circuit connected in series, and the circuit outputs an analog power signal. Wherein, when the time delay of the offset power signal output by the offset analog signal adjustment circuit and the offset analog predistortion signal output by the offset analog distortion extraction adjustment circuit from the input end of the offset branch circuit to the output end of the offset combiner circuit is equal to or similar to that of the offset analog signal, the amplitude is equal to or similar to that of the offset analog predistortion signal, and the phase is the same or similar, the offset power signal and the offset analog predistortion signal in the offset analog predistortion power signal are combined to output; Among them, at the output end of the branch power amplifier circuit, the branch power signal in the branch analog predistortion power signal output by the output end of the branch combiner circuit and the branch distortion signal in the branch power signal output by the branch power amplifier circuit are similar or paired similarly and time-delayed synchronously, and have equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch predistortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc.

[0041] The support distortion adjustment circuit is composed of a support predistortion power amplifier circuit and a support predistortion amplitude modulation and phase modulation amplifier circuit connected in series, and is used to adjust the amplitude and phase of the support predistortion power signal.

[0042] The branch distortion cancellation adjustment circuit is composed of a branch delay adjustment circuit, a branch distortion power amplifier circuit, and a branch distortion amplitude modulation and phase modulation amplifier circuit connected in series, and is used to adjust the delay, amplitude, and phase of the branch pre-distortion cancellation signal; the output power of the branch distortion cancellation adjustment circuit is inversely proportional to the linearity of the branch power signal, and is directly proportional to the main distortion signal value in the main power signal output by the main power amplifier circuit, and is directly proportional to the coupling degree of the main-branch coupling circuit; Specifically, if the linearity of the branch power amplifier circuit is -40~-50dBc, the main power signal output by the main power amplifier circuit is 50dBm, the amplitude of the main distortion signal is -30~-35dBc, and the coupling degree of the main-branch coupling circuit is -15~-20dB, the distortion signal power output by the branch distortion cancellation adjustment circuit is +25dBm to 20dBm. Since the output power of the branch distortion cancellation adjustment circuit should be about 10~12dB greater than the distortion power, the output power of the branch distortion cancellation adjustment circuit is 30~37dBm. The above different conditions are combined, and the output power range of the branch distortion cancellation adjustment circuit is different. Among them, the branch-added shunt circuit, the branch-loss shunt circuit, the branch shunt circuit, and the main branch shunt circuit can be simulated equal-power circuits, and in the specific implementation process can also be simulated unequal-power circuits.

[0043] Among them, the branch-combining circuit, the branch-discombining circuit, and the branch-combining circuit can be composed of analog coupling circuits of equal power, and in the specific implementation process, they can also be composed of analog unequal power circuits.

[0044] Among them, the main path of the main branch coupling circuit is a high-power main path circuit, and the coupling degree of the main branch coupling circuit is directly proportional to the linearity of the branch power signal output by the branch power amplifier circuit above -45~-50dBc, and the insertion loss of the main path of the main branch coupling circuit and the power consumption of the branch distortion cancellation adjustment circuit are inversely proportional to the linearity of the branch power signal output by the branch power amplifier circuit above -45~-50dBc.

[0045] Specifically, when the linearity of the branch power signal is above -40 to -50 dBc, the coupling degree of the main branch coupling circuit is proportional to the linearity of the branch power amplifier circuit, and when the coupling degree is above -10 dB to -20 dB, for example, in the range of -10 dB to -30 dB, the main path insertion loss of the main branch coupling circuit is below -0.55 dB to 0.1 dB, for example, -0.55 dB to 0.05 dB. When the linearity of the branch power signal is lower than -40 dBc, the coupling degree is -10 dB, for example, the main path insertion loss of the main branch coupling circuit is -0.55 dB. Among them, the branch coupling circuit is a forward coupling circuit and can be realized by a separation coupler.

[0046] The rated power of the support attenuation circuit is greater than the power loss determined by the support power signal output by the support power amplification circuit passing through the attenuation range of the support attenuation circuit.

[0047] The rated power of the branch attenuation circuit should be greater than the power loss determined by the branch power signal output by the branch power amplification circuit passing through the attenuation range of the branch attenuation circuit.

[0048] Among them, the support attenuation circuit and the branch attenuation circuit include an attenuation circuit composed of a π-type circuit and an impedance network or a band-stop network circuit.

[0049] The branch absorption load is greater than the power of the branch power signal output by the branch power amplifier circuit, the rated power of the branch absorption load is greater than the power of the branch power signal output by the branch power amplifier circuit, and good heat dissipation is maintained.

[0050] This embodiment Figure 3 In the embodiment, at the output end of the branch power amplifier circuit, the support analog predistortion signal in the support analog predistortion power signal output by the support analog power amplifier circuit is similar to or paired with the branch distortion signal in the branch power signal output by the branch power amplifier circuit and is synchronized in time delay, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch power signal and a branch predistortion cancellation signal with a power signal linearity of more than -45~-50dBc.

[0051] This embodiment Figure 3In the embodiment, from the input end of the branch loss branch circuit to the output end of the branch loss combining circuit, when the support power signal in the support analog predistortion power signal output by the support analog power amplifier circuit has the same or similar time delay, the same or similar amplitude, and the opposite or nearly opposite phase as the support power signal output by the support analog adjustment circuit, the two support power signals are canceled, and the support analog predistortion signal in the support analog predistortion power signal output by the support analog power amplifier circuit is extracted and output by the support distortion adjustment circuit to form the support analog distortion extraction and adjustment circuit in the support distortion extraction and adjustment circuit.

[0052] This embodiment Figure 3 In the embodiment, at the output end of the branch power amplifier circuit, the branch analog predistortion signal output by the branch analog distortion extraction and adjustment circuit is similar to the branch distortion signal in the branch power signal output by the branch power amplifier circuit or is paired similarly and time-delayed synchronously, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch power signal and a branch predistortion cancellation signal with a power signal linearity of more than -45~-50dBc.

[0053] This embodiment Figure 3 In the embodiment, from the input end of the support branch circuit to the output end of the support combining circuit, when the time delay of the support power signal output by the support analog signal adjustment circuit and the support analog predistortion signal output by the support analog distortion extraction adjustment circuit are equal or similar, the amplitudes are equal or similar, and the phases are the same or similar, the support power signal and the support analog predistortion signal in the support analog predistortion power signal are combined to output the support analog predistortion power signal.

[0054] This embodiment Figure 3 In the process, at the output end of the branch power amplifier circuit, the branch power signal in the branch analog predistortion power signal output by the output end of the branch combiner circuit and the branch distortion signal in the branch power signal output by the branch power amplifier circuit are similar or paired similarly and delayed synchronously, and have equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch power signal and a branch analog predistortion cancellation signal with a power signal linearity of more than -45~-50dBc.

[0055] Among them, at the output end of the main power amplifier circuit, the supporting analog predistortion signal in the supporting analog predistortion power signal output by the output end of the supporting combiner circuit and the main distortion signal in the main main power signal output by the main power amplifier circuit are canceled out to form a main predistortion cancellation signal in the main main power signal output by the main power amplifier circuit.

[0056] This embodiment Figure 3In the main path output end from the input end of the main branch shunt circuit to the main branch coupling circuit, when the time delay of the branch power signal and the branch predistortion cancellation signal output by the branch power amplifier circuit in the input end of the branch shunt circuit to the output end of the branch combining circuit is equal or similar, the amplitude is equal or similar, and the phase is opposite or nearly opposite, the cancellation of the two branch power signals is achieved. The branch predistortion cancellation signal in the output of the branch power amplifier circuit extracted at the output end of the branch combining circuit is transmitted to the coupling input end of the main branch coupling circuit through the branch distortion cancellation adjustment circuit, and the main predistortion cancellation signal in the main power signal output through the output end of the main power amplifier circuit is transmitted to the main path input end of the main branch coupling circuit. At the main path output end of the main branch coupling circuit, the branch predistortion cancellation signal in the main power signal is transmitted to the main path input end of the main branch coupling circuit. In the embodiment of the present invention, the branch true signal in the output of the branch power amplifier circuit extracted at the output end of the branch combining circuit is similar to or paired with the main distortion signal in the main main power signal output by the main power amplifier circuit, and the support predistortion signal in the output of the branch power amplifier circuit extracted at the output end of the branch combining circuit is identical to the support predistortion signal in the output of the main power amplifier circuit. When the time delays are equal or similar, the amplitudes are equal or similar, and the phases are opposite or nearly opposite, at the main path output end of the main branch coupling circuit, two-way identical cancellation of the support analog predistortion signal in the combined output of the branch combining circuit output end is achieved, and similar cancellation or paired similar cancellation of the branch distortion signal in the output of the branch power amplifier circuit and the main distortion signal in the output of the main power amplifier circuit are achieved. The linearity of the main main power signal output by the main power amplifier circuit is improved to above -45 to -50 dBc, the efficiency is improved, and the dynamic range of the gain linearity of the Class C main power amplifier circuit is expanded.

[0057] Furthermore, as attached Figure 6 As shown, the power amplifier circuit for pre-distortion cancellation and secondary cancellation in this embodiment can also cooperate with the envelope tracking circuit to maintain the linearity of the main power signal of the main power amplifier circuit to meet the requirements by changing the drain voltage and gate voltage of the main power amplifier circuit, the branch power amplifier circuit, and the branch power amplifier circuit, thereby further improving the working efficiency of the whole machine.

[0058] Furthermore, as attached Figure 7 As shown, based on the power amplifier circuit for pre-distortion cancellation and secondary cancellation in this embodiment, an input branch circuit, a feedforward main signal adjustment circuit, a distortion combining circuit, a distortion coupling circuit, a time delay circuit, a distortion adjustment circuit, a distortion power amplifier circuit, and a feedforward coupling circuit are added to form a combination of a power amplifier circuit for pre-distortion cancellation and secondary cancellation and a feedforward cancellation circuit of the present invention. This combination circuit further improves the linearity of the main power signal output by the main power amplifier circuit of the entire device to above -60dBc to -70dBc, while sacrificing a certain efficiency of the entire device.

[0059] Example 2 As attached Figure 8 , which is a circuit structure diagram of Example 2 of the present invention. Example 2 of the present invention is improved on the basis of Example 1 of the present invention. Specifically, in Example 1, the offset analog distortion extraction and adjustment circuit is replaced with an offset digital distortion extraction and adjustment circuit. In the offset digital distortion extraction and adjustment circuit, the offset power amplifier circuit is composed of a digital pre-distortion circuit to a D / A digital-to-analog conversion circuit via a low-power amplifier circuit to form an offset digital pre-distortion amplifier circuit. The circuit outputs an offset power signal and an offset digital pre-distortion signal in the offset digital pre-distortion power signal.

[0060] At the same time, the analog offset adjustment circuit in Example 1 is replaced by a digital offset adjustment circuit. The digital offset adjustment circuit is composed of a digital delay adjustment circuit to a D / A digital-to-analog conversion circuit through a low-power amplifier circuit, and the circuit outputs a power offset signal. The branch circuit is replaced by a digital offset branch circuit, and an additional A / D analog-to-digital conversion circuit is installed between one output terminal of the branch circuit and the input terminal of the digital offset branch circuit. At the same time, the analog signal adjustment circuit in Example 1 is changed to a digital signal adjustment circuit. The digital signal adjustment circuit is composed of a digital delay adjustment circuit, a D / A digital-to-analog conversion circuit, and an amplitude modulation and phase modulation amplification circuit connected in series to form a digital signal adjustment circuit. When the circuit outputs a power signal, an A / D analog-to-digital conversion circuit is added between the input end of the digital signal adjustment circuit and one of the output ends of the branch circuit. Alternatively, the branch circuit is changed to a digital branch circuit, and an A / D analog-to-digital conversion circuit is added to the input end of the digital branch circuit. One of the output ends of the digital branch circuit is directly connected to the input end of the digital branch circuit. At the same time, a feedback coupling circuit is added between the output end of the branch power amplifier circuit and the main path input end of the branch coupling circuit, the coupling output end of the feedback coupling circuit is connected to the input end of the newly added feedback sampling circuit, the output end of the feedback sampling circuit is connected to the feedback sampling input end of the support digital pre-distortion amplifier circuit, and the support digital pre-distortion amplifier circuit outputs the support power signal and the support digital pre-distortion signal in the support digital pre-distortion power signal; After the above adjustments, the circuit structure of the second embodiment specifically includes: Branch shunt circuit, branch digital distortion extraction and adjustment circuit, branch digital signal adjustment circuit, branch shunt circuit, branch combining circuit, main branch shunt circuit, branch power amplifier circuit, branch coupling circuit, branch absorption load, branch adjustment circuit, branch combining circuit, branch distortion cancellation adjustment circuit, main power amplifier circuit, main branch coupling circuit, feedback coupling circuit, feedback sampling circuit.

[0061] Specifically, the digital distortion extraction and adjustment circuit is composed of an A / D analog-to-digital conversion circuit, a digital branch circuit, a digital pre-distortion amplifier circuit, a digital adjustment circuit, a coupling circuit, a absorbing load, a combining circuit, and a distortion adjustment circuit.

[0062] The rest of the circuit structure is the same as that in the original embodiment 1; Among them, this embodiment Figure 8 A main power amplifier circuit composed of a main power amplifier circuit is selected, wherein the final amplifier circuit of the main power amplifier circuit in the main power amplifier circuit selects a single-channel power amplifier circuit to realize a single-channel main power amplifier circuit or selects a multi-channel power amplifier circuit to realize a multi-channel main power amplifier circuit through Doherty combining, and the power amplifier tubes in the single-channel or multi-channel final-stage power amplifier circuit include MOS tubes, LDMOS power amplifier tubes, gallium nitride, gallium arsenide power amplifier tubes, etc., and the rated output power thereof meets the output power requirement of a pre-distortion cancellation and secondary cancellation power amplifier circuit, wherein the rated output power of the single-channel or multi-channel final-stage power amplifier circuit is in a Class C working state by adjusting the gate voltage of the single-channel or multi-channel final-stage power amplifier tube to form a Class C single-channel or multi-channel power amplifier circuit, forming a Class C main single-channel or multi-channel power amplifier circuit; Among them, this embodiment Figure 8 A branch power amplifier circuit composed of branch similar power amplifier circuits is selected, wherein the single-channel or multiple-channel final-stage amplifier circuits of the branch similar power amplifier circuits in the branch power amplifier circuit are selected from the same type as the MOS power amplifier tubes, LDMOS power amplifier tubes, gallium nitride power amplifier tubes, gallium arsenide power amplifier tubes, etc. selected in the single-channel or multiple-channel final-stage amplifier circuits of the main power amplifier circuit in the main power amplifier circuit, and have similar characteristics and models, and the output power of the single-channel or multiple-channel final-stage power amplifier circuits of the branch similar power amplifier circuit in the branch power amplifier circuit is much smaller than the output power of the single-channel or multiple-channel final-stage power amplifier circuits of the main power amplifier circuit in the main power amplifier circuit, wherein the output rated power of the single-channel or multiple-channel final-stage power amplifier circuit is in a Class C working state by adjusting the gate voltage of the single-channel or multiple-channel final-stage power amplifier tubes of the branch similar power amplifier circuit, thereby forming a Class C single-channel or multiple-channel branch similar power amplifier circuit, and forming a Class C branch single-channel or multiple-channel power amplifier circuit; In the branch power amplifier circuit, the number of paired final-stage parallel circuits of the Class C branch multi-channel power amplifier circuit and the Class C main multi-channel power amplifier circuit at the main path output end of the main branch coupling circuit in the branch power amplifier circuit is equal to the number of paired final-stage parallel circuits in the main path power amplifier circuit, and the branch distortion signal output from one of the final-stage parallel circuits in each pair of branch power amplifier circuits and the main path distortion signal output from one of the final-stage parallel circuits in the main path power amplifier circuit are similarly offset or similarly offset, and the linearity of the main path main power signal output from the main path power amplifier circuit is improved to above -45 to -50 dBc and the efficiency is improved, and the gain linear dynamic range of the Class C main path main power amplifier circuit is extended; in, Figure 8 At the output end of the branch power amplifier circuit, the support digital predistortion signal in the support digital predistortion power signal output by the support digital predistortion amplifier circuit is similar to the branch distortion signal in the branch power signal output by the branch power amplifier circuit and is synchronized in time delay, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby achieving synchronous branch predistortion cancellation that improves the linearity of the branch power signal to above -45~-50dBc, and forming a branch predistortion cancellation signal. Among them, the digital predistortion circuit in the branch digital predistortion amplifier circuit provides a branch distortion signal similar to and synchronized with the branch power signal output by the branch power amplifier circuit, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby achieving synchronous branch predistortion cancellation that improves the linearity of the branch power signal to above -45~-50dBc, and the low-power amplifier circuit provides small-signal amplification of the predistortion power signal; Wherein, the feedback coupling circuit is used to extract the branch distortion signal outputted from the output end of the branch power amplifier circuit; The feedback sampling circuit is composed of a low-power amplifier circuit and an analog-to-digital conversion circuit in series, which is used to convert the radio frequency signal into a digital signal and output it to the digital predistortion circuit; The distorted signal outputted from the output end of the branch power amplifier circuit is sampled by a feedback sampling circuit and outputted to a feedback sampling port of a digital pre-distortion circuit. In the digital pre-distortion circuit, the distorted signal is aligned with the time delay of the forward output main signal, and the distortion characteristics of the distorted signal are extracted through a correlation budget. A digital pre-distorter in the digital pre-distortion circuit generates a digital pre-distortion signal having characteristics opposite to those of the distorted signal. The offset distortion adjustment circuit is composed of an offset predistortion power amplifier circuit and an offset predistortion amplitude modulation and phase modulation amplifier circuit connected in series, and is used to adjust the amplitude and phase of the offset digital predistortion signal.

[0063] The digital pre-distortion amplifier circuit is composed of a digital pre-distortion circuit to a D / A digital-to-analog conversion circuit through a low-power amplifier circuit, and the circuit outputs a support power signal and a support digital pre-distortion signal in the digital pre-distortion power signal; Among them, at the output end of the branch power amplifier circuit, the branch digital predistortion signal in the branch digital predistortion power signal output by the branch digital predistortion amplifier circuit is similar to the branch distortion signal in the branch power signal output by the branch power amplifier circuit and is synchronized in time delay, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch predistortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc.

[0064] The digital adjustment circuit for the support is composed of a digital delay adjustment circuit to a D / A digital-to-analog conversion circuit through a low-power amplifier circuit, and the circuit outputs a support power signal; Wherein, from the input end of the branch loss splitting circuit to the output end of the branch loss combining circuit, when the offset power signal in the offset digital predistortion power signal output by the offset digital predistortion amplifying circuit has the same or similar time delay, the same or similar amplitude, and the opposite or nearly opposite phase as the offset power signal output by the offset digital adjustment circuit, the two offset power signals are canceled, and the offset digital predistortion signal in the offset digital predistortion power signal output by the offset digital predistortion amplifying circuit is extracted and outputted by the offset distortion adjustment circuit to form the offset digital distortion extraction and adjustment circuit in the offset distortion extraction and adjustment circuit; Among them, at the output end of the branch power amplifier circuit, the branch digital predistortion signal output by the branch digital distortion extraction and adjustment circuit is similar to the branch distortion signal in the branch power signal output by the branch power amplifier circuit and is synchronized in time delay, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch predistortion cancellation signal, which improves the linearity of the branch power signal to above -45~-50dBc.

[0065] The digital signal adjustment circuit is composed of a digital delay adjustment circuit, a D / A digital-to-analog conversion circuit, and an amplitude modulation and phase modulation amplifier circuit in series, and the circuit outputs a power signal. When the time delay of the offset power signal output by the offset digital signal adjustment circuit and the offset digital predistortion signal output by the offset digital distortion extraction adjustment circuit from the input end of the offset branch circuit to the output end of the offset combiner circuit is equal to or similar to that of the offset digital predistortion signal, the amplitude is equal to or similar to that of the offset digital predistortion signal, and the phase is the same or similar, the offset power signal and the offset digital predistortion signal in the offset digital predistortion power signal are combined to output; Among them, at the output end of the branch power amplifier circuit, the branch power signal in the branch digital predistortion power signal output by the output end of the branch combiner circuit and the branch distortion signal in the branch power signal output by the branch power amplifier circuit are similar and synchronized in time delay, and have equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch predistortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc.

[0066] The branch distortion cancellation adjustment circuit is composed of a branch delay adjustment circuit, a branch distortion power amplifier circuit, and a branch distortion amplitude modulation and phase modulation amplifier circuit connected in series, and is used to adjust the delay, amplitude, and phase of the branch pre-distortion cancellation signal; the output power of the branch distortion cancellation adjustment circuit is inversely proportional to the linearity of the branch power signal, and is directly proportional to the main distortion signal value in the main power signal output by the main power amplifier circuit, and is directly proportional to the coupling degree of the main-branch coupling circuit; Specifically, for example, when the linearity of the branch power amplifier circuit is -40 to -50 dBc, the main power signal output by the main power amplifier circuit is 50 dBm, the amplitude of the main distortion signal is -30 to -35 dBc, and the coupling degree of the main-branch coupling circuit is -15 to -20 dB, the distortion signal power output by the branch distortion cancellation adjustment circuit is +25 dBm to 20 dBm. According to the branch distortion cancellation adjustment circuit, the output power of the branch distortion cancellation adjustment circuit is about 10 to 12 dB greater than the distortion power, and the output power of the branch distortion cancellation adjustment circuit is 30 to 37 dBm. When the above different conditions are met, the output power range of the branch distortion cancellation adjustment circuit is different. Among them, in the main path output end from the input end of the main branch shunt circuit to the main branch coupling circuit, the branch distortion signal in the branch power signal output by the branch power amplifier circuit and the main distortion signal in the main main power signal output by the main power amplifier circuit are similarly offset, and the linearity of the main main power signal output by the main power amplifier circuit is improved to above -45~-50dBc and the efficiency is improved, and the gain linear dynamic range of the Class C main power amplifier circuit is expanded.

[0067] Among them, the branch shunt circuit, the branch shunt circuit, and the main branch shunt circuit are simulated equal power circuits, and in the specific implementation process, they can also be composed of simulated unequal power circuits.

[0068] Among them, the digital branch circuit for gain and the digital branch circuit for loss are composed of digital branch circuits with equal power, and can also be composed of digital branch circuits with unequal power.

[0069] Among them, the branch-combining circuit, the branch-discombining circuit, and the branch-combining circuit are composed of analog coupling circuits of equal power, and in the specific implementation process, they can also be composed of analog unequal power circuits.

[0070] Among them, the main path of the main branch coupling circuit can be a high-power main path circuit, and the coupling degree of the main branch coupling circuit is directly proportional to the linearity of the branch power signal output by the branch power amplifier circuit, which is above -45~-50dBc. The insertion loss of the main path of the main branch coupling circuit and the power consumption of the branch distortion cancellation adjustment circuit are inversely proportional to the linearity of the branch power signal output by the branch power amplifier circuit, which is above -45~-50dBc.

[0071] When the linearity of the branch power signal is above -40 to -50 dBc, the coupling degree of the main branch coupling circuit is proportional to the linearity of the branch power amplifier circuit, and when the coupling degree is above -10 dB to -20 dB, for example, in the range of -10 dB to -30 dB, the main path insertion loss of the main branch coupling circuit is -0.55 to 0.1 dB, or below, for example, -0.55 dB to 0.05 dB. When the linearity of the branch power signal is lower than -40 dBc, the coupling degree is -10 dB, for example, the main path insertion loss of the main branch coupling circuit is -0.55 dB. Among them, the support coupling circuit, the branch coupling circuit and the feedback coupling circuit are realized by a separation coupler.

[0072] The rated power of the support attenuation circuit is greater than the power loss determined by the support power signal output by the support power amplification circuit passing through the attenuation range of the support attenuation circuit.

[0073] The rated power of the branch attenuation circuit should be greater than the power loss determined by the branch power signal output by the branch power amplification circuit passing through the attenuation range of the branch attenuation circuit.

[0074] Among them, the support attenuation circuit and the branch attenuation circuit include an attenuation circuit composed of a π-type circuit and an impedance network or a band-stop network circuit.

[0075] The branch absorption load is greater than the power of the branch power signal output by the branch power amplifier circuit, the rated power of the branch absorption load is greater than the power of the branch power signal output by the branch power amplifier circuit, and good heat dissipation is maintained.

[0076] This implementation Figure 8In the embodiment, at the output end of the branch power amplifier circuit, the support digital predistortion signal in the support digital predistortion power signal output by the support digital predistortion amplifier circuit is similar to the branch distortion signal in the branch power signal output by the branch power amplifier circuit and is synchronized in time delay, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch power signal and a branch predistortion cancellation signal with a power signal linearity of more than -45~-50dBc.

[0077] This embodiment Figure 8 In the embodiment, from the input end of the branch loss digital branch circuit to the output end of the branch loss combining circuit, when the offset power signal in the offset digital predistortion power signal output by the offset digital predistortion amplifying circuit has the same or similar time delay, the same or similar amplitude, and the opposite or nearly opposite phase as the offset power signal output by the offset digital adjustment circuit, the two offset power signals are canceled, and the offset digital predistortion signal in the offset digital predistortion power signal output by the offset digital predistortion amplifying circuit is extracted and outputted by the offset distortion adjustment circuit to form the offset digital distortion extraction and adjustment circuit in the offset distortion extraction and adjustment circuit.

[0078] This embodiment Figure 8 In the embodiment, at the output end of the branch power amplifier circuit, the branch digital predistortion signal output by the branch digital distortion extraction and adjustment circuit is similar to the branch distortion signal in the branch power signal output by the branch power amplifier circuit and is synchronized in time delay, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch power signal and a branch predistortion cancellation signal with a power signal linearity of more than -45~-50dBc.

[0079] This embodiment Figure 8 In the embodiment, from the input end of the support branch circuit to the output end of the support combining circuit, when the time delay of the support power signal output by the support digital signal adjustment circuit and the support digital predistortion signal output by the support digital distortion extraction adjustment circuit are equal or similar, the amplitudes are equal or similar, and the phases are the same or similar, the support power signal and the support digital predistortion signal in the support digital predistortion power signal are combined to output.

[0080] This embodiment Figure 8 In the process, at the output end of the branch power amplifier circuit, the branch power signal in the branch digital predistortion power signal output by the output end of the branch combiner circuit and the branch distortion signal in the branch power signal output by the branch power amplifier circuit are similar and synchronized in time delay, and have equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch power signal and a branch predistortion cancellation signal with a power signal linearity of more than -45~-50dBc.

[0081] This embodiment Figure 8 In the main branch coupling circuit, the time delay of the branch power signal output by the branch power amplifier circuit through the input end of the branch shunt circuit to the output end of the branch combining circuit is equal to or close to the time delay of the branch power signal output by the branch adjustment circuit, the amplitude of the branch power signal output by the branch power amplifier circuit through the input end of the branch shunt circuit to the output end of the branch combining circuit is equal to or close to the amplitude of the branch power signal output by the branch adjustment circuit, and the phase of the branch power signal output by the branch power amplifier circuit through the input end of the branch shunt circuit to the output end of the branch combining circuit is opposite to or close to the phase of the branch power signal output by the branch adjustment circuit. When the time delay of the branch pre-distortion cancellation signal in the branch power amplifier circuit output through the output end of the branch combining circuit to the coupling input end of the main branch coupling circuit is equal to or close to the time delay of the main pre-distortion cancellation signal in the main path main power signal output through the output end of the main path power amplifier circuit to the main path input end of the main branch coupling circuit, the amplitude of the branch pre-distortion cancellation signal in the branch power amplifier circuit output through the output end of the branch combining circuit to the coupling input end of the main branch coupling circuit is equal to or close to the amplitude of the main pre-distortion cancellation signal in the main path main power signal output through the output end of the main path power amplifier circuit to the main path input end of the main branch coupling circuit, and the phase of the branch pre-distortion cancellation signal in the branch power amplifier circuit output through the output end of the branch combining circuit to the coupling input end of the main branch coupling circuit is opposite to or close to the phase of the main pre-distortion cancellation signal in the main path main power signal output through the output end of the main path power amplifier circuit to the main path input end of the main branch coupling circuit, the branch distortion signal in the branch power amplifier circuit output through the output end of the branch combining circuit to the main path output end of the main branch coupling circuit is similar to the main distortion signal in the main path main power signal output by the main path power amplifier circuit, and the branch pre-distortion signal in the branch power amplifier circuit output through the output end of the branch combining circuit is the same as the branch pre-distortion signal in the main path power amplifier circuit output. When the time delay is equal to or close, the amplitude is equal to or close, and the phase is opposite or close to opposite, the two-way same cancellation of the branch pre-distortion digital power signal in the branch pre-distortion digital power signal output by the branch pre-distortion combining circuit output end in the main path output end of the main branch coupling circuit and the similar cancellation of the branch distortion signal in the branch power amplifier circuit output and the main distortion signal in the main path power amplifier circuit output are realized, the linearity of the main path main power signal output by the main path power amplifier circuit is improved to above-45~-50dBc, the efficiency is improved, and the dynamic range of the gain linearity of the C-class main path power amplifier circuit is expanded.

[0082] It should be noted that, according to the needs of implementation, each step / component described in the present application can be split into more steps / components, or two or more steps / components or part of the operation of the steps / components can be combined into a new step / component, so as to achieve the purpose of the present application.

[0083] The size of the serial number of each step in the above embodiment does not mean the order of execution, the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. It should be understood that those skilled in the art can improve or transform according to the above description, and all these improvements and transformations should belong to the protection scope of the claims of the present application.

Claims

1. A power amplifier circuit with predistortion cancellation and secondary cancellation, characterized in that: The input signal passes through the two output ends of the branch circuit, and the support predistortion signal output by the support distortion extraction and adjustment circuit and the support power signal output by the support signal adjustment circuit through one of the output ends of the branch circuit are respectively connected to the two input ends of the corresponding branch combining circuit; The branch power signal and the branch predistortion signal in the branch predistortion power signal are combined and output at the output end of the branch combining circuit, and are transmitted to the output end of the branch power amplifier circuit through one of the output ends of the main branch shunt circuit, thereby achieving synchronous branch predistortion cancellation of the branch predistortion signal in the branch predistortion power signal and the branch distortion signal in the branch power signal output by the branch power amplifier circuit. The generated branch power signal and the branch predistortion cancellation signal with a linearity of more than -45 to -50 dBc are output through the branch attenuation circuit, or through the main path of the branch coupling circuit to the branch absorbing load, and then output through the coupling end of the branch coupling circuit. The branch power signal is transmitted through the output end of the branch signal adjustment circuit through the second output end of the branch shunt circuit to the output of the branch adjustment circuit, and then respectively reaches the two input ends of the branch combining circuit. The two branch power signals are cancelled at the output end of the branch combining circuit, and the branch predistortion cancellation signal is extracted. At the output end of the branch combining circuit, the support power signal and the support predistortion signal in the support predistortion power signal are combined and output, and the support predistortion signal in the support predistortion power signal is output to the output end of the main power amplifier circuit through the second output end of the main branch branch circuit to realize the main predistortion cancellation of the support predistortion signal in the support predistortion power signal and the main distortion signal in the main power signal output by the main power amplifier circuit. The formed main power signal and main predistortion cancellation signal are output to the main path input end of the main branch coupling circuit, and the branch predistortion cancellation signal extracted at the output end of the branch combining circuit is output to the main branch coupling circuit through the branch distortion cancellation adjustment circuit. The coupling input end realizes two-way identical cancellation of the branch pre-distortion signal in the branch pre-distortion power signal outputted by the branch combiner circuit at the main path output end of the main branch coupling circuit, and realizes similar cancellation or paired similar cancellation of the branch distortion signal in the output of the branch power amplifier circuit and the main distortion signal in the output of the main power amplifier circuit, thereby forming a power amplifier circuit with pre-distortion cancellation and secondary cancellation, improving the linearity of the main power signal outputted by the main power amplifier circuit to above -45~-50dBc and improving the efficiency, and extending the dynamic range of the gain linearity of the Class C main power amplifier circuit.

2. The predistortion cancellation and secondary cancellation power amplifier circuit according to claim 1, characterized in that: in, The support distortion extraction and adjustment circuit includes: The support power signal and the support predistortion signal in the support predistortion power signal output by the support power amplifier circuit are respectively transmitted through the two output ends of the branch loss dividing circuit to the output end of the support attenuation circuit, or through the main path of the support coupling circuit to the support absorption load, output through the coupling end of the support coupling circuit, and the support power signal output by the support adjustment circuit are respectively correspondingly transmitted to the two input ends of the branch loss combining circuit. When the time delay of the support predistortion power signal output by the support power amplifier circuit and the support power signal output by the support adjustment circuit at the output end of the branch loss combining circuit are equal or similar, the amplitude is equal or similar, and the phase is opposite or nearly opposite, the two support power signals are canceled, and the support predistortion signal in the support predistortion power signal output by the support power amplifier circuit is extracted and output through the support distortion adjustment circuit to form a support distortion extraction and adjustment circuit.

3. The predistortion cancellation and secondary cancellation power amplifier circuit according to claim 1 or 2, characterized in that: in, In the offset distortion extraction and adjustment circuit, the offset power amplifier circuit is composed of an offset similar power amplifier circuit, or a small signal power amplifier circuit connected in series with an offset similar power amplifier circuit, wherein the offset similar power amplifier circuit is composed of multiple power amplifier circuits connected in series, or / and multiple power amplifier circuits connected in parallel, and the power amplifier circuit includes a class A, class B, class C, class AB or Doherty power amplifier circuit; The output combining circuit of the multiple power amplifier circuits connected in parallel includes a power combining circuit, an impedance conversion network combining circuit and a Doherty combining circuit, which output the supporting power signal and the supporting predistortion signal in the supporting power amplifier circuit; The small signal power amplifier circuit in the supporting power amplifier circuit is similar to the small signal power amplifier circuit in the branch power amplifier circuit; and the output power of the supporting similar power amplifier circuit in the supporting power amplifier circuit is equal to or less than the output power of the branch similar power amplifier circuit in the branch power amplifier circuit; When the support distortion extraction and adjustment circuit is a support analog distortion extraction and adjustment circuit, the support power amplifier circuit is composed of a support similar analog power amplifier circuit, or is composed of a small signal power amplifier circuit connected in series with a support similar analog power amplifier circuit, wherein the support similar analog power amplifier circuit is composed of multiple stages of analog power amplifier circuits connected in series, or / and multiple analog power amplifier circuits connected in parallel to form a support similar analog power amplifier circuit, the analog power amplifier circuit includes a Class A, Class B, Class C, Class AB or Doherty power amplifier circuit, the output combining circuit of the multiple analog power amplifier circuits connected in parallel includes a power combining circuit, an impedance transformation network combining circuit and a Doherty combining circuit, and the circuit outputs a support power signal and a support analog predistortion signal in the support predistortion power signal; Alternatively, when the branch distortion extraction and adjustment circuit is a branch analog-to-digital distortion extraction and adjustment circuit, the branch power amplifier circuit is composed of an A / D analog-to-digital conversion circuit, a digital predistortion circuit, a D / A digital-to-analog conversion circuit, and a low-power amplifier circuit to form a branch analog-to-digital predistortion amplifier circuit. Simultaneously, a feedback coupling circuit is added between the output end of the branch power amplifier circuit and the main path input end of the branch coupling circuit. The coupling output end of the feedback coupling circuit is connected to the input end of the newly added feedback sampling circuit. The output end of the feedback sampling circuit is connected to the feedback sampling input end of the branch analog-to-digital predistortion amplifier circuit. Furthermore, the branch analog-to-digital predistortion amplifier circuit outputs a branch power signal and a branch analog-to-digital predistortion signal from the branch power amplifier circuit. Alternatively, when the branch distortion extraction and adjustment circuit is a branch digital distortion extraction and adjustment circuit, the branch power amplifier circuit is composed of a digital predistortion circuit to a D / A digital-to-analog conversion circuit via a low-power amplifier circuit to form a branch digital predistortion amplifier circuit. Simultaneously, a feedback coupling circuit is added between the output end of the branch power amplifier circuit and the main path input end of the branch coupling circuit. The coupling output end of the feedback coupling circuit is connected to the input end of the newly added feedback sampling circuit. The output end of the feedback sampling circuit is connected to the feedback sampling input end of the branch analog digital predistortion amplifier circuit. Furthermore, the circuit outputs a branch power signal and a branch digital predistortion signal from the branch digital predistortion power signal. Wherein, at the output end of the branch power amplifier circuit, the branch predistortion signal in the branch predistortion power signal output by the branch power amplifier circuit is similar or paired similar and time-delay synchronized with the branch distortion signal in the branch power signal output by the branch power amplifier circuit, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby achieving synchronous branch predistortion similarity or paired similarity cancellation, and forming a branch predistortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc; The branch distortion signal in the branch power signal output by the branch power amplifier circuit and the offset predistortion signal in the offset predistortion power signal output by the offset power amplifier circuit are paired similarly to each other, as follows: the number of paired final-stage parallel circuits in the offset power amplifier circuit is equal to the number of final-stage parallel circuits in the branch power amplifier circuit, and the offset predistortion signal output by one of the final-stage parallel circuits in each pair of the offset power amplifier circuits and the branch distortion signal output by one of the final-stage parallel circuits in the branch power amplifier circuit are paired similarly to each other or paired similarly to each other, and the linearity of the branch power signal output by the branch power amplifier circuit is improved to above -45 to -50 dBc.

4. The predistortion cancellation and secondary cancellation power amplifier circuit according to claim 1, 2 or 3, wherein: In the support distortion extraction and adjustment circuit, the support adjustment circuit is composed of a support main signal power amplifier circuit, a delay adjustment circuit and a support main signal amplitude modulation and phase modulation amplifier circuit connected in series; When the support power amplifier circuit is a support analog power amplifier circuit, the support adjustment circuit is composed of a support analog main signal power amplifier circuit, an analog delay adjustment circuit, and a support main signal analog amplitude modulation and phase modulation amplifier circuit connected in series to form a support analog adjustment circuit, and the circuit outputs a support power signal; Alternatively, when the support power amplifier circuit is a support analog-digital predistortion amplifier circuit, the support adjustment circuit is composed of an A / D analog-to-digital conversion circuit, a digital delay circuit, a D / A digital-to-analog conversion circuit, and a low-power amplifier circuit to form a support analog-to-digital adjustment circuit, and the circuit outputs a support power signal; Alternatively, when the support power amplifier circuit is a support digital pre-distortion amplifier circuit, the support adjustment circuit is composed of a digital delay adjustment circuit, a D / A digital-to-analog conversion circuit, and a low-power amplifier circuit to form a support digital adjustment circuit, and the circuit outputs a support power signal. The branch circuit is changed into a branch digital branch circuit, and an additional A / D analog-to-digital conversion circuit is installed between one output end of the branch circuit and the input end of the branch digital branch circuit, or additional A / D analog-to-digital conversion circuits are installed between two output ends of the branch circuit and the input end of the support digital pre-distortion amplifier circuit and between the output end of the branch digital adjustment circuit respectively. Wherein, from the input end of the branch loss splitting circuit to the output end of the branch loss combining circuit, when the offset power signal in the offset predistortion power signal output by the offset power amplifying circuit and the offset power signal output by the offset adjustment circuit have equal or similar time delays, equal or similar amplitudes, and opposite or nearly opposite phases, the two offset power signals are canceled out, and the offset predistortion signal in the offset predistortion power signal output by the offset power amplifying circuit is extracted and outputted by the offset distortion adjustment circuit to form an offset analog distortion extraction adjustment circuit, or an offset analog-digital distortion extraction adjustment circuit, or an offset digital distortion extraction adjustment circuit in the offset distortion extraction and adjustment circuit; Among them, at the output end of the branch power amplifier circuit, the branch pre-distortion signal output by the branch distortion extraction and adjustment circuit is similar to the branch distortion signal in the branch power signal output by the branch power amplifier circuit or is paired similarly and time-delayed synchronously, and has equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch pre-distortion cancellation and forming a branch pre-distortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc.

5. The predistortion cancellation and secondary cancellation power amplifier circuit according to claim 1, wherein: in, The support signal adjustment circuit is composed of a support time delay adjustment circuit and a support signal amplitude modulation and phase modulation amplification circuit connected in series; When the offset distortion extraction and adjustment circuit is an offset analog distortion extraction and adjustment circuit, the offset signal adjustment circuit is composed of an offset analog delay adjustment circuit and an offset analog signal amplitude modulation and phase modulation amplification circuit connected in series to form an offset analog signal adjustment circuit, and the circuit outputs an offset power signal; Alternatively, when the offset distortion extraction and adjustment circuit is an offset analog-to-digital distortion extraction and adjustment circuit, the offset signal adjustment circuit is composed of an A / D analog-to-digital conversion circuit, a digital delay circuit, a D / A digital-to-analog conversion circuit, and an amplitude modulation and phase modulation amplification circuit in series to form an offset analog-to-digital signal adjustment circuit, and the circuit outputs an offset power signal; Alternatively, when the offset distortion extraction and adjustment circuit is a offset digital distortion extraction and adjustment circuit, the offset signal adjustment circuit is composed of a digital delay adjustment circuit, a D / A digital-to-analog conversion circuit, and an amplitude modulation and phase modulation amplification circuit connected in series to form an offset digital signal adjustment circuit, and the circuit outputs an offset power signal; wherein an A / D analog-to-digital conversion circuit is added between the input end of the offset digital signal adjustment circuit and one of the output ends of the offset shunt circuit; Wherein, when the time delay of the offset power signal output by the offset signal adjustment circuit and the offset predistortion signal output by the offset distortion extraction adjustment circuit from the input end of the offset branch circuit to the output end of the offset combiner circuit is equal to or similar to that of the offset predistortion signal, the amplitude is equal to or similar to that of the offset signal, and the phase is the same or similar, the offset power signal and the offset predistortion signal in the offset predistortion power signal are combined to output; Among them, at the output end of the branch power amplifier circuit, the branch power signal in the branch predistortion power signal output by the output end of the branch combiner circuit and the branch distortion signal in the branch power signal output by the branch power amplifier circuit are similar or paired similarly and delayed synchronously, and have equal or similar amplitudes and opposite or nearly opposite phases, thereby realizing synchronous branch predistortion cancellation and forming a branch predistortion cancellation signal, thereby improving the linearity of the branch power signal to above -45~-50dBc.

6. The predistortion cancellation and secondary cancellation power amplifier circuit according to claim 1, characterized in that: in, In the path from the input end of the main branch branch circuit to the output end of the main branch coupling circuit, when the time delays of the branch power signal and the branch predistortion cancellation signal output by the branch power amplifier circuit in the input end of the branch branch circuit to the output end of the branch combining circuit are equal or similar, the amplitudes are equal or similar, and the phases are opposite or nearly opposite, the cancellation of the two branch power signals is achieved, the branch predistortion cancellation signal in the output of the branch power amplifier circuit extracted at the output end of the branch combining circuit is transmitted to the coupling input end of the main branch coupling circuit via the branch distortion cancellation adjustment circuit, and the main predistortion cancellation signal in the main power signal output via the output end of the main power amplifier circuit is transmitted to the main path input end of the main branch coupling circuit, and the main path output of the main branch coupling circuit is transmitted to the main path output end of the main branch coupling circuit. In the embodiment of the present invention, a branch distortion signal extracted from the output of the branch power amplifier circuit at the output of the branch combining circuit is similar to or similar to a main distortion signal in a main power signal output by the main power amplifier circuit, and a support predistortion signal extracted from the output of the branch power amplifier circuit at the output of the branch combining circuit is identical to the support predistortion signal in the output of the main power amplifier circuit. When the time delays are equal or similar, the amplitudes are equal or similar, and the phases are opposite or nearly opposite, at the main path output of the main branch coupling circuit, two-way identical cancellation of the support predistortion signal in the combined output of the support predistortion power signal at the output of the branch combining circuit is achieved, and similar cancellation or similar paired cancellation of the branch distortion signal in the output of the branch power amplifier circuit is achieved with the main distortion signal in the output of the main power amplifier circuit. This improves the linearity of the main power signal output by the main power amplifier circuit to above -45 to -50 dBc, improves the efficiency, and expands the dynamic range of the gain linearity of the Class C main power amplifier circuit. Among them, the paired similarity cancellation of the branch distortion signal in the branch power signal output by the branch power amplifier circuit in the main path output end of the main branch coupling circuit and the main distortion signal in the main path main power signal output by the main path power amplifier circuit is as follows: the number of paired final-stage parallel circuits in the branch power amplifier circuit is equal to the number of paired final-stage parallel circuits in the main path power amplifier circuit, and the branch distortion signal in the output of one of the final-stage parallel circuits in each pair of branch power amplifier circuits and the main path distortion signal in the output of one of the final-stage parallel circuits in the main path power amplifier circuit are paired similarity canceled or paired similarity canceled, and the linearity of the main path main power signal output by the main path power amplifier circuit is improved to above -45~-50dBc and the efficiency is improved, and the gain linearity dynamic range of the Class C main path main power amplifier circuit is extended.

7. The predistortion cancellation and secondary cancellation power amplifier circuit according to claim 1, wherein: in, The main power amplifier circuit is composed of a main power amplifier circuit, or a small signal power amplifier circuit connected in series with the main power amplifier circuit, wherein the main power amplifier circuit is composed of multiple power amplifier circuits connected in series, or / and multiple power amplifier circuits connected in parallel, and the power amplifier circuit includes a Class A, Class B, Class C, Class AB or Doherty power amplifier circuit; The output combining circuit of the multiple power amplifier circuits connected in parallel includes a power combining circuit, an impedance conversion network combining circuit and a Doherty combining circuit, and the main power amplifier circuit outputs a main power signal and a main distortion signal. Among them, at the output end of the main power amplifier circuit, the support predistortion signal in the support predistortion power signal output by the output end of the support combiner circuit and the main distortion signal in the main main power signal output by the main power amplifier circuit are canceled out by the main predistortion, thereby forming a main predistortion cancellation signal in the main main power signal output by the main power amplifier circuit.

8. The pre-distortion cancellation and secondary cancellation power amplifier circuit according to any one of claims 1 to 4, characterized in that: in, The branch power amplifier circuit is composed of a branch similar power amplifier circuit, or a small signal power amplifier circuit connected in series with a branch similar power amplifier circuit, wherein the branch similar power amplifier circuit is composed of multiple power amplifier circuits connected in series, or / and multiple power amplifier circuits connected in parallel, the power amplifier circuit includes Class A, Class B, Class C or Class AB, or a Doherty circuit, and the branch power amplifier circuit outputs a branch power signal and a branch distortion signal; The output combining circuit of the multiple power amplifier circuits connected in parallel includes a power combining circuit, an impedance conversion network combining circuit and a Doherty combining circuit; The small signal power amplifier circuit in the branch power amplifier circuit is similar to the small signal power amplifier circuit in the main power amplifier circuit; Among them, the output power of the branch power amplifier circuit is much smaller than the output power of the main power amplifier circuit; Among them, in the main path output end from the input end of the main branch shunt circuit to the main branch coupling circuit, the branch distortion signal in the branch power signal output by the branch power amplifier circuit and the main distortion signal in the main power signal output by the main power amplifier circuit are similarly offset or paired similarly offset, and the linearity of the main power signal output by the main power amplifier circuit is improved to above -45~-50dBc.

9. The pre-distortion cancellation and secondary cancellation power amplifier circuit according to claim 1, wherein: in, The branch adjustment circuit is composed of a branch main signal power amplifier circuit and a branch main signal amplitude modulation and phase modulation amplifier circuit connected in series, and the branch adjustment circuit outputs a branch power signal; Among them, when the branch power signal output by the branch adjustment circuit and the branch power signal and the branch pre-distortion cancellation signal output by the branch power amplification circuit have equal or similar time delays, equal or similar amplitudes, and opposite or nearly opposite phases at the output end of the branch combining circuit from the input end of the branch splitting circuit to the output end of the branch combining circuit, the two branch power signals are canceled and the branch pre-distortion cancellation signal in the output of the branch power amplification circuit is extracted.

10. The predistortion cancellation and secondary cancellation power amplifier circuit according to claim 2, characterized in that: in, The support distortion adjustment circuit is composed of a support predistortion power amplifier circuit and a support predistortion amplitude modulation and phase modulation amplifier circuit connected in series.

11. The predistortion cancellation and secondary cancellation power amplifier circuit according to claim 1, wherein: in, The branch distortion cancellation adjustment circuit is composed of a branch distortion power amplifier circuit and a branch distortion amplitude modulation and phase modulation amplifier circuit connected in series; Among them, the output power of the branch distortion cancellation adjustment circuit is inversely proportional to the cancellation value of the branch pre-distortion cancellation signal output by the branch power amplifier circuit or inversely proportional to the linearity of the branch power signal, and is inversely proportional to the linearity of the main power signal output by the main power amplifier circuit, and is directly proportional to the coupling degree of the main-branch coupling circuit.

12. The predistortion cancellation and secondary cancellation power amplifier circuit according to any one of claims 1 to 4 or 7 to 8, characterized in that: in, The branch shunt circuit, the branch loss shunt circuit, the branch shunt circuit, and the main branch shunt circuit are shunt circuits simulating equal power shunt circuits, unequal power shunt circuits, or unequal power coupling circuits; The branch-loss digital shunt circuit is a shunt circuit of a digital equal-power shunt circuit, a digital unequal-power shunt circuit, or a digital unequal-power coupling circuit.

13. The predistortion cancellation and secondary cancellation power amplifier circuit according to any one of claims 1 to 3, characterized in that: in, The branch-combining circuit, the branch-loss combining circuit, and the branch combining circuit include power combining circuits of equal power, unequal power, and combining circuits of unequal power coupling circuits.

14. The pre-distortion cancellation and secondary cancellation power amplifier circuit according to claim 1, wherein: in, The main path of the main branch coupling circuit is a high-power main path circuit, and the coupling degree of the main branch coupling circuit is directly proportional to the cancellation value of the branch pre-distortion cancellation signal output by the branch power amplifier circuit within a certain range of -40dBc to -50dBc or above, or is directly proportional to the linearity of the branch power signal within a certain range of -40~-50dBc or above. The insertion loss of the main path of the main branch coupling circuit is inversely proportional to the linearity of the branch power signal output by the branch power amplifier circuit within a certain range of -40~-50dBc or above.

15. The predistortion cancellation and secondary cancellation power amplifier circuit according to any one of claims 1 to 4 or 7 to 8, characterized in that: in, Support coupling circuit, branch coupling circuit, feedback coupling circuit includes microstrip coupling circuit and separation coupling circuit; Or the rated power of the support attenuation circuit should be greater than the power loss determined by the support power signal output by the support power amplifier circuit passing through the attenuation range of the support attenuation circuit; The rated power of the branch attenuation circuit should be greater than the power loss determined by the branch power signal output by the branch power amplifier circuit passing through the attenuation range of the branch attenuation circuit; The support attenuation circuit and the branch attenuation circuit include an attenuation circuit composed of a π-type circuit and an impedance network or a band-stop network circuit.

16. The predistortion cancellation and secondary cancellation power amplifier circuit according to any one of claims 1 to 4 or 7 to 8, characterized in that: in, The branch absorbing load should be greater than the power of the branch power signal output by the branch power amplifier circuit, the rated power of the branch absorbing load should be greater than the power of the branch power signal output by the branch power amplifier circuit, and maintain good heat dissipation.

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