Signal generation device and method and power amplification system

Abstract

The invention discloses a signal generation device and method and a power amplification system. The signal generation device comprises a compensation module and a signal amplification module. The compensation module is used for providing at least one path of compensation signal; and the signal amplification module is used for amplifying the compensation signal, so that the amplified compensation signal is matched with the power amplifier. In the application, the compensation signal generated by the compensation module can compensate the variable quantity of the related signal in the power amplifier along with time and / or environmental factors, so that the output signal of the power amplifier is prevented from being influenced by the environmental factors such as time and / or temperature and is more stable; and the compensation signal provided by the compensation module can be determined according to the possible change condition of the power amplifier in the corresponding application scene, is independent of components such as a main bias circuit in the power amplifier, does not need to change the internal structure and / or parameters of the power amplifier, can be applied to various types of power amplifiers, and has high practicability. And the method can be applied to various application scenes and has higher flexibility.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a signal generating device, method and power amplification system. Background Art

[0002] The power amplifier (PA) is an important component of the RF device, and the stability of its output signal has a significant impact on the performance of the RF device. However, in actual operation, the output signal of the power amplifier is easily affected by environmental factors such as time and / or temperature. For example, the output signal amplitude of some power amplifiers will increase as the ambient temperature rises. Traditional solutions often adjust the output signal of the power amplifier by reconfiguring the structure and / or parameters of the main bias circuit in the power amplifier to make its output signal tend to be stable; this adjustment solution requires changing the structure and / or parameters of the power amplifier (such as the main bias circuit), which has limitations. Summary of the invention

[0003] In view of this, the present application provides a signal generating device, method and power amplification system to solve the problem that the traditional solution for stabilizing the output signal of the power amplifier has limitations.

[0004] The present application provides a signal generating device, comprising a compensation module and a signal amplification module;

[0005] The compensation module is used to provide at least one compensation signal;

[0006] The signal amplification module is used to amplify the compensation signal so that the amplified compensation signal matches the power amplifier.

[0007] Optionally, the compensation module includes a reference current source, a first resistor and at least one current providing unit; the input end of the reference current source is used to access the first voltage, and the output end is connected to the input end of the signal amplification module, for generating a reference current; the current providing unit is used to output a time-varying current in at least one direction to the output end of the reference current, and the time-varying current is superimposed on the reference current to form the compensation current; the first resistor is connected between the output end of the reference current source and the ground end, for converting the compensation current into a compensation voltage.

[0008] Optionally, the at least one current providing unit includes a first current providing unit and / or a second current providing unit; the first current providing unit is used to provide a first superimposed current so that the corresponding compensation current has a downward compensation capability; the second current providing unit is used to provide a second superimposed current so that the corresponding compensation current has an upward compensation capability.

[0009] Optionally, the first current providing unit includes at least one pull-up current generating branch; the pull-up current generating branch includes a first current source, a first variable capacitor, a first variable resistor and a first MOS tube; the input end of the first current source is used to access the second voltage and is connected to the first end of the first variable resistor, and the output end is respectively connected to the first end of the first variable capacitor and the gate of the first MOS tube; the second end of the first variable capacitor is grounded; the source of the first MOS tube is connected to the second end of the first variable resistor, and the drain is connected to the output end of the reference current source.

[0010] Optionally, the first current providing unit also includes a first switch corresponding to each of the pull-up current generating branches; the first switch is arranged between the drain of the first MOS tube and the output end of the reference current source, and is used to control the on and off of the corresponding pull-up current generating branch.

[0011] Optionally, the second current providing unit includes at least one pull-down current generating branch; the pull-down current generating branch includes a second current source, a second variable capacitor, a second variable resistor, a second MOS tube, a third MOS tube and a fourth MOS tube; the input end of the second current source is used to access the third voltage and is connected to the first end of the second variable resistor, and the output end is respectively connected to the first end of the second variable capacitor and the gate of the second MOS tube; the second end of the second variable capacitor is grounded; the drain of the second MOS tube is respectively connected to the drain of the third MOS tube, the gate of the third MOS tube and the gate of the fourth MOS tube; the source of the third MOS tube is grounded; the drain of the fourth MOS tube is connected to the output end of the reference current source, and the source is grounded.

[0012] Optionally, the second current providing unit also includes a second switch corresponding to each of the pull-down current generating branches; the second switch is arranged between the drain of the fourth MOS tube and the output end of the reference current source, and is used to control the on and off of the corresponding pull-down current generating branch.

[0013] Optionally, the compensation module includes a downward compensation branch and / or an upward compensation branch; the downward compensation branch is used to provide a first time-varying voltage that decreases with time; and the upward compensation branch is used to provide a second time-varying voltage that increases with time.

[0014] Optionally, the signal generating device also includes a third switch corresponding to the downward compensation branch and a fourth switch corresponding to the upward compensation branch; the third switch is arranged between the output end of the downward compensation branch and the input end of the signal amplification module, and is used to control the on-off of the downward compensation branch; the fourth switch is arranged between the output end of the upward compensation branch and the input end of the signal amplification module, and is used to control the on-off of the upward compensation branch.

[0015] Optionally, the downward compensation branch includes a first voltage source, a second resistor, a third resistor and a first capacitor; the first end of the first voltage source is grounded, and the second end is respectively connected to the first end of the second resistor and the first end of the first capacitor; the second end of the second resistor is respectively connected to the second end of the first capacitor, the first end of the third resistor and the input end of the signal amplification module; the second end of the third resistor is grounded.

[0016] Optionally, the upward compensation branch includes a second voltage source, a fourth resistor, a fifth resistor, a sixth resistor and a second capacitor; the first end of the second voltage source is grounded, and the second end is connected to the first end of the fourth resistor; the second end of the fourth resistor is respectively connected to the first end of the fifth resistor, the first end of the second capacitor and the input end of the signal amplification module; the second end of the fifth resistor is respectively connected to the second end of the second capacitor and the first end of the sixth resistor; the second end of the sixth resistor is grounded.

[0017] The present application also provides a signal generation method, which is applied to any of the above-mentioned signal generation devices, including:

[0018] Obtain compensation requirements for power amplifiers;

[0019] Providing at least one compensation signal according to the compensation requirement;

[0020] The compensation signal is amplified so that the amplified compensation signal matches the power amplifier.

[0021] The present application also provides a power amplification system, which includes a power amplifier and any one of the above-mentioned signal generating devices.

[0022] In the above-mentioned signal generating device, method and power amplification system of the present application, the compensation module can provide at least one compensation signal according to the possible changes in the output signal of the power amplifier in the corresponding application scenario to compensate the output signal of the power amplifier, so that the signal amplification module amplifies the above-mentioned compensation signal and then acts on the power amplifier. In this way, the compensation signal can compensate for the changes in the relevant signal in the power amplifier caused by time and / or environmental factors, so that the output signal of the power amplifier is not affected by environmental factors such as time and / or temperature, and is more stable. The compensation signal provided by the compensation module can be determined according to the changes that may occur in the power amplifier in the corresponding application scenario, and is independent of components such as the main bias circuit in the power amplifier. There is no need to change the internal structure and / or parameters of the power amplifier, and can be applicable to multiple types of power amplifiers and multiple types of application scenarios, with higher flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic diagram of the structure of a power amplification system according to an embodiment of the present application;

[0025] Figure 2 is a schematic diagram of the structure of a power amplification system according to another embodiment of the present application;

[0026] Figure 3 is a schematic diagram of the structure of a power amplification system according to another embodiment of the present application;

[0027] Figure 4a , Figure 4b , Figure 4c and Figure 4d is a schematic diagram of related signals according to an embodiment of the present application;

[0028] Figure 5a , Figure 5b and Figure 5c is a schematic diagram of a first current providing unit according to an embodiment of the present application;

[0029] Figure 6a , Figure 6b and Figure 6c is a schematic diagram of a second current providing unit according to an embodiment of the present application;

[0030] Figure 7 is a schematic diagram of the structure of a power amplification system according to another embodiment of the present application;

[0031] Figure 8a , Figure 8b and Figure 8c is a schematic diagram of the structure of a power amplification system according to another embodiment of the present application;

[0032] Figure 9a is a schematic diagram of the structure of a power amplification system according to another embodiment of the present application;

[0033] Figure 9b and Fig.9c It is a schematic diagram of related signals of an embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In the absence of conflict, the following embodiments and their technical features can be combined with each other.

[0035] In a first aspect, the present application provides a signal generating device, which is used in a power amplifier system to provide a control signal to a power amplifier in the power amplifier system, so that the output signal of the power amplifier is more stable. Figure 1 As shown, the signal generating device comprises a compensation module 100 and a signal amplifying module 200 .

[0036] The compensation module 100 is used to provide at least one compensation signal (such as a compensation voltage or a compensation current, etc.) to compensate for possible changes in the output signal of the power amplifier 300. The number of compensation signals and compensation characteristics provided by the compensation module 100 can be determined according to possible changes in the output signal of the power amplifier 300 in the corresponding application scenario; for example, if the output signal of the power amplifier 300 increases with the increase of temperature, the compensation module 100 can provide a compensation signal that gradually decreases; for another example, if the output signal of the power amplifier 300 decreases with time, the compensation module 100 can provide a compensation signal that gradually increases; for another example, the compensation module 100 can provide two or more compensation signals to compensate for the changes of the power amplifier 300 after the multiple compensation signals are combined. Optionally, the compensation module 100 can output multiple compensation signals, such as simultaneously outputting multiple upward compensation signals (gradually increasing compensation signals), and simultaneously outputting multiple downward compensation signals (gradually decreasing compensation signals), or simultaneously outputting at least one upward compensation signal and at least one downward compensation signal, etc. Optionally, the compensation module 100 includes a plurality of compensation branches, and each compensation branch can output a compensation signal.

[0037] The signal amplification module 200 is used to amplify the compensation signal so that the amplified compensation signal matches the bias / drive requirements of the power amplifier 300. For example, the amplified compensation signal can directly act on the main bias circuit and other components of the power amplifier 300. In this way, the compensation signal can compensate for the changes in the relevant signals in the power amplifier 300 caused by time and / or environmental factors, so that the output signal of the power amplifier 300 is not affected by environmental factors such as time and / or temperature, and is more stable. The compensation signal provided by the compensation module 100 can be determined based on the changes that may occur in the power amplifier 300 in the corresponding application scenario, and is independent of the main bias circuit and other components in the power amplifier 300. There is no need to change the internal structure and / or parameters of the power amplifier 300, and it can be applicable to multiple types of power amplifiers and multiple types of application scenarios, with higher flexibility.

[0038] Optionally, the signal amplification module 200 refers to Figure 2 As shown, it includes an operational amplifier Q, a resistor Ra1 and a resistor Ra2; the first input terminal (non-inverting input terminal) of the operational amplifier Q serves as the input terminal of the signal amplification module 200, connected to the output terminal of the compensation module 100, and the second input terminal (inverting input terminal) is respectively connected to the first end of the resistor Ra1 and the first end of the resistor Ra2; the second end of the resistor Ra2 is grounded; the second end of the resistor Ra1 is connected to the output terminal of the operational amplifier Q; the output terminal of the operational amplifier Q serves as the output terminal of the signal amplification module 200, and is used to output the amplified compensation signal.

[0039] In some embodiments, reference Figure 3 As shown, the compensation module 100 includes a reference current source I0, a first resistor R1 and at least one current providing unit (such as a first current providing unit 111 and / or a second current providing unit 112).

[0040] The input end of the reference current source I0 is used to access the first voltage Vdd1 , and the output end is connected to the input end of the signal amplification module 200 , and is used to generate a reference current, which may be a bandgap reference current.

[0041] The output end of the current providing unit is connected to the output end of the reference current source I0, and is used to output a time-varying current in at least one direction to the output end of the reference current, so as to generate a time-varying current, and the time-varying current is superimposed on the reference current to form the compensation current.

[0042] The first resistor R1 is connected between the output end of the reference current source I0 and the ground end, and is used to convert the compensation current into a compensation voltage. The compensation voltage is input into the signal amplification module 200 as a compensation signal. The amplified compensation voltage output by the signal amplification module 200 can act on components such as the main bias circuit of the power amplifier 300 to compensate for possible changes in the output signal of the power amplifier 300.

[0043] In some examples, such as Figure 3 As shown, the at least one current providing unit includes a first current providing unit 111 and / or a second current providing unit 112 .

[0044] The first current providing unit 111 is used to provide a first superimposed current so that the corresponding compensation current has a downward compensation capability (for example, compensating for the increase in the corresponding signal), so that the subsequent compensation voltage can compensate for the increase in the output signal of the power amplifier 300. Specifically, the compensation current after the first superimposed current and the reference current are superimposed can refer to Figure 4a , Figure 4a In the figure, Ios represents the first superimposed current, I0 represents the reference current, and the compensation current after the superposition of the two is converted into a compensation voltage. The compensation voltage decreases with time, so it has a downward compensation capability and can compensate for the situation where the relevant signal in the power amplifier 300 becomes larger. After being amplified by the signal amplification module 200, the compensation voltage acts on the power amplifier 300, and the output signal RFout of the power amplifier 300 may refer to Figure 4b As shown, Figure 4b It is characterized that when the output signal of the power amplifier 300 may increase due to environmental factors, the first current providing unit 111 is used to provide the first superimposed current Ios, and the power amplifier 300 is compensated after corresponding processing, so that the output signal RFout of the power amplifier 300 can be kept within a stable range, and the fidelity of the output signal RFout of the power amplifier 300 can be improved.

[0045] The second current providing unit 112 is used to provide a second superimposed current so that the corresponding compensation current has an upward compensation capability (for example, compensating for the decrease in the corresponding signal), so that the subsequent compensation voltage can compensate for the decrease in the output signal of the power amplifier 300. Specifically, the compensation current after the second superimposed current and the reference current are superimposed can refer to Figure 4c , Figure 4cIn the figure, Ius represents the second superimposed current, and I0 represents the reference current. The compensation current after the superposition of the two is converted into a compensation voltage. The compensation voltage increases with time, so it has an upward compensation capability and can compensate for the situation where the relevant signal in the power amplifier 300 becomes smaller. After being amplified by the signal amplification module 200, the compensation voltage acts on the power amplifier 300, and the output signal RFout of the power amplifier 300 may refer to Figure 4d As shown, Figure 4d It is characterized that when the output signal of the power amplifier 300 may become smaller due to environmental factors, the second current providing unit 112 is used to provide the second superimposed current Ius, and the power amplifier 300 is compensated after corresponding processing, so that the output signal RFout of the power amplifier 300 can be kept within a stable range, and the fidelity of the output signal RFout of the power amplifier 300 can be improved.

[0046] In some examples, such as Figure 5a As shown, the first current providing unit 111 includes at least one pull-down current generating branch Ios, and each pull-down current generating branch Ios is used to generate a first superimposed current. The first superimposed current has a decreasing rate (also referred to as a slope), and optionally, the amplitude and decreasing rate of the first superimposed current generated by each pull-down current generating branch Ios are different from each other, so that the decreasing rate of the first superimposed current provided by the entire first current providing unit 111 can be adjusted by adjusting the pull-down current generating branch connected to the first current providing unit 111.

[0047] Specifically, refer to Figure 5b As shown, the pull-down current generating branch Ios includes a first current source Ir_os, a first variable capacitor Ct_os, a first variable resistor Rt_os and a first MOS tube M1; the first MOS tube M1 can be a PMOS tube. The input end of the first current source Ir_os is used to access the second voltage Vdd2 and is connected to the first end of the first variable resistor Rt_os, and the output end is respectively connected to the first end of the first variable capacitor Ct_os and the gate of the first MOS tube M1. The second end of the first variable capacitor Ct_os is grounded. The source of the first MOS tube M1 is connected to the second end of the first variable resistor Rt_os, and the drain is connected to the output end of the reference current source I0, which can be used as the output end of the pull-down current generating branch Ios to output a first superimposed current Ios, so that the first superimposed current Ios is superimposed on the reference current. The specific parameters of the first variable capacitor Ct_os and the first variable resistor Rt_os can be set according to the required decrease rate of the corresponding first superimposed current Ios. For example, the first variable resistor Rt_os can be used to determine the maximum value of the first superimposed current Ios, and the first variable capacitor Ct_os can be used to determine the time when the first superimposed current Ios changes from the maximum value to the minimum value.

[0048] Figure 5b In the pull-down current generating branch Ios shown in FIG. 1 , when the first current source Ir_os starts to provide current, the first MOS tube M1 is turned on, and the first superimposed current Ios reaches a maximum value at this time. As the gate voltage of the first MOS tube M1 increases, the first superimposed current Ios gradually decreases. The change process can be referred to Figure 4a As shown in Ios, when the gate voltage of the first MOS tube M1 rises to a certain level, the first MOS tube M1 is turned off. At this time, the first superimposed current Ios is 0. Since the current direction of the first superimposed current Ios is consistent with the current direction of the reference current I0, the compensation current after the superposition of the two is as follows: Figure 4a Optionally, the first current source Ir_os may be controlled by an enable signal, for example, the control terminal of the first current source Ir_os may be connected to the enable signal, when the enable signal is at a high level, the first current source Ir_os provides a corresponding current, and when the enable signal is at a low level, the first current source Ir_os does not provide a current.

[0049] Optionally, refer to Figure 5c As shown, the first current providing unit 111 also includes first switches S1 corresponding to each pull-down current generating branch Ios; the first switch S1 can be arranged between the drain of the first MOS tube M1 and the output end of the reference current source I0, and is used to control the on-off of the corresponding pull-down current generating branch Ios, that is, when the pull-down current generating branch Ios needs to be turned on, the corresponding first switch S1 is closed, and when the pull-down current generating branch Ios needs to be turned off, the corresponding first switch S1 is opened.

[0050] In some examples, such as Figure 6a As shown, the second current supply unit includes at least one pull-up current generating branch Ius, and each pull-up current generating branch Ius is used to generate a second superimposed current. The second superimposed current has a rising rate (also referred to as a slope), and optionally, the rising rates of the second superimposed current generated by each pull-up current generating branch Ius are different from each other, so that the rising rate of the second superimposed current provided by the entire second current providing unit 112 can be adjusted by adjusting the pull-up current generating branch connected to the second current providing unit 112.

[0051] Specifically, refer to Figure 6bAs shown, the pull-up current generating branch Ius includes a second current source Ir_us, a second variable capacitor Ct_us, a second variable resistor Rt_us, a second MOS transistor M2, a third MOS transistor M3 and a fourth MOS transistor M4; wherein the second MOS transistor M2 is a PMOS transistor, and the third MOS transistor M3 and the fourth MOS transistor M4 are NMOS transistors respectively. The input end of the second current source Ir_us is used to access the third voltage Vdd3 and is connected to the first end of the second variable resistor Rt_us, and the output end is respectively connected to the first end of the second variable capacitor Ct_us and the gate of the second MOS transistor M2; the second end of the second variable capacitor Ct_us is grounded; the drain of the second MOS transistor M2 is respectively connected to the drain M3 of the third MOS transistor, the gate of the third MOS transistor M3 and the gate of the fourth MOS transistor M4; the source of the third MOS transistor M3 is grounded; the source of the fourth MOS transistor M4 is grounded, and the drain is connected to the output end of the reference current source I0, which can be used as the output end of the pull-up current generating branch Ius to output a second superimposed current Ius, so that the second superimposed current Ius is superimposed on the reference current. The specific parameters of the second variable capacitor Ct_us and the second variable resistor Rt_us can be set according to the required rising rate of the corresponding second superimposed current Ius. For example, the second variable resistor Rt_us can be used to determine the maximum value of the second superimposed current Ius, and the second variable capacitor Ct_us can be used to determine the time when the second superimposed current Ius changes from the minimum value to the maximum value.

[0052] Figure 6b In the pull-up current generating branch Ius shown in FIG. 1 , when the second current source Ir_us just starts to provide current, the second MOS tube M2 is turned on, and the drain current of the second MOS tube M2 reaches a maximum value. The third MOS tube M3 and the fourth MOS tube M4 form a mirror circuit to copy the drain current of the second MOS tube M2 to obtain the second superimposed current Ius, so that the second superimposed current Ius reaches a maximum value. As the gate voltage of the second MOS tube M2 increases, the drain current of the second MOS tube M2 gradually decreases. When the gate voltage of the second MOS tube M2 rises to a certain level, the second MOS tube M2 is turned off. At this time, the drain current of the second MOS tube M2, that is, the second superimposed current Ius is 0. Since the current direction of the second superimposed current Ius is opposite to the current direction of the reference current I0, the compensation current after the superposition of the two is as follows: Figure 4c Optionally, the second current source Ir_us may be controlled by an enable signal, for example, the control terminal of the second current source Ir_us may be connected to the enable signal, when the enable signal is at a high level, the second current source Ir_us provides a corresponding current, and when the enable signal is at a low level, the second current source Ir_us does not provide a current.

[0053] Among them, the above-mentioned first voltage Vdd1, second voltage Vdd2 and third voltage Vdd3 can be the same voltage or can be unequal voltages; for example, the three can be the same voltage, or the three can be three different voltages, or any two of the three can be the same voltage and the other can be another voltage.

[0054] Optionally, refer to Figure 6c As shown, the second current providing unit 112 also includes a second switch S2 corresponding to each pull-up current generating branch Ius; the second switch is arranged between the drain of the fourth MOS tube M4 and the output end of the reference current source I0, and is used to control the on-off of the corresponding pull-up current generating branch Ius, that is, when the pull-up current generating branch Ius needs to be turned on, the corresponding second switch S2 is closed, and when the pull-up current generating branch Ius needs to be turned off, the corresponding second switch S2 is opened.

[0055] In some examples, reference Figure 7 As shown, the compensation module 100 includes a first current providing unit 111 and a second current providing unit 112, that is, includes at least one pull-down current generating branch Ios, at least one pull-up current generating branch Ius, at least one first switch S1 corresponding to each pull-down current generating branch Ios, and at least one second switch S2 corresponding to each pull-up current generating branch Ius. In this way, the compensation module 100 can close at least one first switch S1 and connect the corresponding pull-down current generating branch Ios when a downward compensation voltage (also referred to as a negative compensation voltage) is required, and close at least one second switch S2 and connect the corresponding pull-up current generating branch Ius when an upward compensation voltage (also referred to as a positive compensation voltage) is required. In some scenarios, the compensation module 100 can also simultaneously connect at least part of the first switch S1 and at least part of the second switch S2 to provide a superimposed current with an appropriate rate of change.

[0056] Optionally, the signal generating device may further include a control module (not shown in the figure), which may connect each first switch S1 and each second switch S2 to control the on and off of each first switch S1 and each second switch S2 according to the compensation requirement of the power amplifier 300. The control module may be implemented using a low-power chip such as a single-chip microcomputer. Optionally, the control module can load a control program according to the compensation requirements of the power amplifier 300 in each time period, so as to control the on and off of each first switch S1 and second switch S2 according to the control program. For example, if the output signal of the power amplifier 300 in the first time period may become larger and downward compensation is required, the output signal in the second time period is within an acceptable range, the output signal in the third time period may become smaller and upward compensation is required, and the output signal in the fourth time period becomes smaller to a greater extent and a larger upward compensation is required, then the control module can turn on a pull-down current generating branch Ios in the first time period, disconnect all first switches S1 and second switches S2 in the second time period, turn on a pull-up current generating branch Ius in the third time period, and continue to turn on another pull-up current generating branch Ius in the fourth time period (a larger upward compensation is provided by turning on two pull-up current generating branches Ius).

[0057] In some embodiments, reference Figure 8a and Figure 8b As shown, the compensation module 100 includes a downward compensation branch 121 and / or an upward compensation branch 122. Specifically, when the compensation module 100 includes both the downward compensation branch 121 and the upward compensation branch 122, the downward compensation branch 121 and the upward compensation branch 122 respectively have corresponding switches to switch one of them on.

[0058] The downward compensation branch 121 is used to provide a first time-varying voltage that decreases with time. The first time-varying voltage can be amplified by the signal amplification module 200 to obtain a downward compensation voltage, which can compensate for the change of the relevant signal in the power amplifier 300 that increases with time.

[0059] The upward compensation branch 122 is used to provide a second time-varying voltage that increases with time. After being amplified by the signal amplification module 200, the second time-varying voltage can obtain an upward compensation voltage, which can compensate for the change in the relevant signal in the power amplifier 300 that decreases with time.

[0060] In some examples, reference Figure 8cAs shown, the signal generating device further includes a third switch S3 corresponding to the downward compensation branch 121 and a fourth switch S4 corresponding to the upward compensation branch 122. The third switch S3 is arranged between the output end of the downward compensation branch 121 and the input end of the signal amplification module 200, and is used to control the on-off of the downward compensation branch 121, that is, when the downward compensation branch 121 needs to be connected, the corresponding third switch S3 is closed, and when the downward compensation branch 121 needs to be turned off, the corresponding third switch S3 is turned off. The fourth switch S4 is arranged between the output end of the upward compensation branch 122 and the input end of the signal amplification module 200, and is used to control the on-off of the upward compensation branch 122, that is, when the upward compensation branch 122 needs to be connected, the corresponding fourth switch S4 is closed, and when the upward compensation branch 122 needs to be turned off, the corresponding fourth switch S4 is turned off.

[0061] Optionally, if the signal generating device further includes a control module, the third switch S3 and the fourth switch S4 may be connected to the control module respectively, so that the control module controls the on and off of the third switch S3 and the fourth switch S4 according to the compensation requirement of the power amplifier 300 .

[0062] In some examples, reference Figure 9a As shown, the downward compensation branch 121 includes a first voltage source V1, a second resistor R2, a third resistor R3 and a first capacitor C1. The first end of the first voltage source V1 is grounded, and the second end is respectively connected to the first end of the second resistor R2 and the first end of the first capacitor C1; the second end of the second resistor R2 serves as the output end of the downward compensation branch 121, and is respectively connected to the second end of the first capacitor C1, the first end of the third resistor R3 and the input end of the signal amplification module 200; the second end of the third resistor R3 is grounded. If the signal generating device further includes a third switch S3, the second end of the second resistor R2 can be connected to the input end of the signal amplification module 200 through the third switch S3.

[0063] In the downward compensation branch 121, when the first voltage source V1 starts to provide voltage, the voltage at the output end of the downward compensation branch 121 (i.e., the second end of the second resistor R2) is the voltage provided by the first voltage source V1. Due to the charging effect of the first capacitor C1, the voltage at the output end gradually decreases and eventually forms a stable voltage. The voltage change process of the output end can be referred to Figure 9b As shown, it is the first time-varying voltage that decreases with time.

[0064] Optionally, the first voltage source V1 can be controlled by an enable signal. For example, the control end of the first voltage source V1 can be connected to the enable signal. When the enable signal is at a high level, the first voltage source V1 provides a corresponding voltage. When the enable signal is at a low level, the first voltage source V1 does not provide a voltage.

[0065] In some examples, such as Figure 9aAs shown, the upward compensation branch 122 includes a second voltage source V2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a second capacitor C2. The first end of the second voltage source V2 is grounded, and the second end is connected to the first end of the fourth resistor R4; the second end of the fourth resistor R4 is used as the output end of the upward compensation branch 122, and is respectively connected to the first end of the fifth resistor R5, the first end of the second capacitor C2, and the input end of the signal amplification module 200; the second end of the fifth resistor R5 is respectively connected to the second end of the second capacitor C2 and the first end of the sixth resistor R6; the second end of the sixth resistor R6 is grounded. If the signal generating device further includes a fourth switch S4, the second end of the fourth resistor R4 can be connected to the input end of the signal amplification module 200 through the fourth switch S4.

[0066] In the upward compensation branch 122, when the second voltage source V2 starts to provide voltage, the voltage at the output end of the upward compensation branch 122 (i.e., the second end of the fourth resistor R4) is the voltage at the first end of the sixth resistor R6. Due to the charging effect of the second capacitor C2, the voltage at the output end gradually increases and eventually forms a stable voltage. The voltage change process of the output end can be referred to Fig.9c As shown, it is a second time-varying voltage that increases with time.

[0067] Optionally, the second voltage source V2 can be controlled by an enable signal. For example, the control end of the second voltage source V2 can be connected to the enable signal. When the enable signal is at a high level, the second voltage source V2 provides a corresponding voltage. When the enable signal is at a low level, the second voltage source V2 does not provide a voltage.

[0068] In the above signal generating device, the compensation module 100 can provide at least one compensation signal according to the possible changes in the output signal of the power amplifier 300 in the corresponding application scenario to compensate for the output signal of the power amplifier 300, so that the signal amplification module 200 amplifies the above compensation signal and then acts on the power amplifier 300. In this way, the compensation signal can compensate for the changes in the relevant signal in the power amplifier 300 caused by time and / or environmental factors, so that the output signal of the power amplifier 300 is not affected by environmental factors such as time and / or temperature, and is more stable. The compensation signal provided by the compensation module 100 can be determined based on the changes that may occur in the power amplifier 300 in the corresponding application scenario, and is independent of the main bias circuit and other components in the power amplifier 300. There is no need to change the internal structure and / or parameters of the power amplifier 300. It can be applicable to multiple types of power amplifiers and multiple types of application scenarios, and has higher flexibility.

[0069] It should be noted that, in the above-mentioned embodiments, one end of a device is connected (or accessed) to an object, and one end of the device may be directly connected (or accessed) to the corresponding object, for example, the input end of the reference current source I0 is used to access the first voltage Vdd1, and the input end of the reference current source I0 may be directly connected to the first voltage Vdd1; one end of a device is connected (or accessed) to an object, and one end of the device may be indirectly connected (or accessed) to the corresponding object, for example, the input end of the reference current source I0 is used to access the first voltage Vdd1, and the input end of the reference current source I0 may be connected to the first voltage Vdd1 through other components, that is, the input end of the reference current source I0 is first connected to one end of a component, and the other end of the component is then connected to the first voltage Vdd1; the present application does not make specific limitations on this.

[0070] A second aspect of the present application provides a signal generating method, which is applied to the signal generating device described in any of the above embodiments, and includes steps S410 to S430.

[0071] S410, obtaining the compensation requirement of the power amplifier. In step S410, the power amplifier may be tested and analyzed in the corresponding application scenario to obtain the variation characteristics of the output signal of the power amplifier in each time period in such application scenario, so as to determine the compensation requirement of the power amplifier; for example, in a certain application scenario, the output signal of the power amplifier may increase in the first time period, and the compensation requirement in the first time period is downward compensation, and the output signal in the second time period may decrease, and the compensation requirement in the second time period is upward compensation.

[0072] S420, providing at least one compensation signal according to the compensation requirement. Specifically, step S420 can provide the compensation signal in different time periods, for example, it can connect a pull-down current generating branch or a downward compensation branch in the first time period to provide a downward compensation signal, connect a pull-up current generating branch or an upward compensation branch in the second time period to provide an upward compensation signal, connect two pull-down current generating branches in the third time period to continue to increase the amplitude of the downward compensation signal, and so on.

[0073] S430, amplify the compensation signal so that the amplified compensation signal matches the power amplifier and can directly act on components such as the main bias circuit of the power amplifier, so that the compensation signal can compensate for the changes in the relevant signal in the power amplifier caused by time and / or environmental factors, so that the output signal of the power amplifier is not affected by environmental factors such as time and / or temperature, and is more stable.

[0074] The above signal generating method is applied to the signal generating device described in any of the above embodiments, and has all the beneficial effects of the signal generating device described in any of the above embodiments, which will not be described in detail here.

[0075] The third aspect of the present application provides a power amplification system, referring to Figures 1 to 3 As shown in the figures, the power amplification system includes a power amplifier 300 and a signal generating device as described in any of the above embodiments.

[0076] Specifically, refer to Figure 2 and Figure 3 As shown, the power amplifier 300 may include components such as a main bias circuit 310, a resistor Rb, an inductor L, a voltage source Vcc, a capacitor Cin and a capacitor Cout. These components are connected accordingly and can be applied to various application scenarios under the action of the compensation signal output by the above-mentioned signal generating device. It has a stable output signal in various application scenarios and has higher reliability.

[0077] The above-mentioned power amplifier includes the signal generating device described in any of the above-mentioned embodiments, and has all the beneficial effects of the signal generating device described in any of the above-mentioned embodiments, which will not be repeated here.

[0078] Although the present application has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art based on reading and understanding of this specification and the accompanying drawings. The present application includes all such modifications and variations and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the above-mentioned components, the terms used to describe such components are intended to correspond to any component (unless otherwise indicated) that performs the specified function of the component (e.g., it is functionally equivalent), even if it is not structurally equivalent to the disclosed structure that performs the functions in the exemplary implementation of this specification shown herein.

[0079] That is, the above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present application, such as the mutual combination of technical features between the embodiments, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

[0080] In addition, in the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, for structural elements with the same or similar characteristics, the present application may use the same or different reference numerals for identification. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0081] In this application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or more advantageous than other embodiments. In order to enable any technician in the field to implement and use the present application, the present application provides the above description. In the above description, various details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other embodiments, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

Claims

1. A signal generating device, characterized in that: The signal generating device comprises a compensation module and a signal amplifying module; The compensation module is used to provide at least one compensation signal; The signal amplification module is used to amplify the compensation signal so that the amplified compensation signal matches the power amplifier.

2. The signal generating device according to claim 1, characterized in that: The compensation module includes a reference current source, a first resistor and at least one current providing unit; The input end of the reference current source is used to access the first voltage, and the output end is connected to the input end of the signal amplification module, so as to generate a reference current; The current providing unit is used to output a time-varying current in at least one direction to the output end of the reference current, and the time-varying current is superimposed on the reference current to form the compensation current; The first resistor is connected between the output terminal of the reference current source and the ground terminal, and is used to convert the compensation current into a compensation voltage.

3. The signal generating device according to claim 2, characterized in that: The at least one current providing unit includes a first current providing unit and / or a second current providing unit; The first current providing unit is used to provide a first superimposed current so that the corresponding compensation current has a downward compensation capability; The second current providing unit is used for providing a second superimposed current so that the corresponding compensation current has an upward compensation capability.

4. The signal generating device according to claim 3, characterized in that: The first current providing unit includes at least one pull-up current generating branch; The pull-up current generating branch includes a first current source, a first variable capacitor, a first variable resistor and a first MOS transistor; the input end of the first current source is used to access the second voltage and is connected to the first end of the first variable resistor, and the output end is respectively connected to the first end of the first variable capacitor and the gate of the first MOS transistor; The second end of the first variable capacitor is grounded; the source of the first MOS tube is connected to the second end of the first variable resistor, and the drain is connected to the output end of the reference current source.

5. The signal generating device according to claim 4, characterized in that: The first current providing unit further includes first switches corresponding to each of the pull-up current generating branches; The first switch is arranged between the drain of the first MOS tube and the output end of the reference current source, and is used to control the on-off of the corresponding pull-up current generating branch.

6. The signal generating device according to claim 3, characterized in that: The second current providing unit includes at least one pull-down current generating branch; The pull-down current generating branch includes a second current source, a second variable capacitor, a second variable resistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor; the input end of the second current source is used to access the third voltage and is connected to the first end of the second variable resistor, and the output end is respectively connected to the first end of the second variable capacitor and the gate of the second MOS transistor; the second end of the second variable capacitor is grounded; the drain of the second MOS transistor is respectively connected to the drain of the third MOS transistor, the gate of the third MOS transistor and the gate of the fourth MOS transistor; The source of the third MOS tube is grounded; the drain of the fourth MOS tube is connected to the output end of the reference current source, and the source is grounded.

7. The signal generating device according to claim 6, characterized in that: The second current providing unit further includes second switches corresponding to each of the pull-down current generating branches; The second switch is arranged between the drain of the fourth MOS tube and the output end of the reference current source, and is used to control the on-off of the corresponding pull-down current generating branch.

8. The signal generating device according to claim 1, characterized in that: The compensation module includes a downward compensation branch and / or an upward compensation branch; The downward compensation branch is used to provide a first time-varying voltage that decreases with time; The upward compensation branch is used to provide a second time-varying voltage that increases with time.

9. The signal generating device according to claim 8, characterized in that: The signal generating device further comprises a third switch corresponding to the downward compensation branch and a fourth switch corresponding to the upward compensation branch; The third switch is arranged between the output end of the downward compensation branch and the input end of the signal amplification module, and is used to control the on-off of the downward compensation branch; The fourth switch is arranged between the output end of the upward compensation branch and the input end of the signal amplification module, and is used to control the on-off of the upward compensation branch.

10. The signal generating device according to claim 8, characterized in that: The downward compensation branch includes a first voltage source, a second resistor, a third resistor and a first capacitor; The first end of the first voltage source is grounded, and the second end is respectively connected to the first end of the second resistor and the first end of the first capacitor; the second end of the second resistor is respectively connected to the second end of the first capacitor, the first end of the third resistor and the input end of the signal amplification module; the second end of the third resistor is grounded.

11. The signal generating device according to claim 8, characterized in that: The upward compensation branch includes a second voltage source, a fourth resistor, a fifth resistor, a sixth resistor and a second capacitor; The first end of the second voltage source is grounded, and the second end is connected to the first end of the fourth resistor; the second end of the fourth resistor is respectively connected to the first end of the fifth resistor, the first end of the second capacitor and the input end of the signal amplification module; the second end of the fifth resistor is respectively connected to the second end of the second capacitor and the first end of the sixth resistor; the second end of the sixth resistor is grounded.

12. A signal generating method, characterized in that: The signal generating method is applied to the signal generating device according to any one of claims 1 to 11, comprising: Obtain compensation requirements for power amplifiers; Providing at least one compensation signal according to the compensation requirement; The compensation signal is amplified so that the amplified compensation signal matches the power amplifier.

13. A power amplification system, characterized in that: The power amplification system comprises a power amplifier and the signal generating device according to any one of claims 1 to 11.

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