A power amplifier circuit, device and radio frequency front-end module

Abstract

The present invention provides a power amplifier circuit, device and radio frequency front-end module. The power amplifier circuit provided by the present invention includes a voltage conversion circuit, a first power amplifier and at least one second power amplifier connected to the first power amplifier; the first power amplifier is used to receive a first power supply voltage; the voltage conversion circuit is used to receive a preset voltage and the first power supply voltage, and output a second power supply voltage to the second power amplifier according to the first power supply voltage; wherein the preset voltage is used to power the voltage conversion circuit, and the voltage value of the first power supply voltage is linearly related to the voltage value of the second power supply voltage. The power amplifier circuit of the present invention can reduce the power supply pressure of the power supply of the radio frequency power amplifier system, thereby improving the stability and power added efficiency of the radio frequency power amplifier system.

Description

Technical Field

[0001] The present invention relates to the technical field of power amplifiers, and in particular to a power amplifier circuit, a device and a radio frequency front-end module. Background Art

[0002] The RF power amplifier system is an important component of the RF front end. Through the RF power amplifier system, the electronic terminal can obtain a higher RF output power. At present, when the RF output power of the RF power amplifier system is high, the power supply voltage of the RF power amplifier system is generally adjusted in real time to adapt to the change of the RF output power of the RF power amplifier system, reduce the power consumption of the RF power amplifier system, and thus make the working efficiency of the power supply supplying power to the RF power amplifier system better.

[0003] At present, the power amplifier structure generally includes multi-stage cascade amplification or parallel amplification (for example: Doherty architecture, differential architecture, etc.), and the multi-stage power amplifiers are all powered by one power supply, which leads to excessive power supply pressure on the power supply of the RF power amplifier system, thereby affecting the stability of the RF power amplifier system. Summary of the invention

[0004] The purpose of the present invention is to provide a power amplifier circuit, device and radio frequency front-end module to solve the technical problem in the prior art that the stability of the radio frequency power amplification system is poor due to the use of the same power supply to power multiple power amplifiers.

[0005] The technical solution of the present invention is as follows: a power amplifier circuit is provided, comprising: a voltage conversion circuit, a first power amplifier and at least one second power amplifier connected to the first power amplifier;

[0006] The first power amplifier is used to receive a first supply voltage;

[0007] The voltage conversion circuit is used to receive a preset voltage and the first power supply voltage, and output a second power supply voltage to the second power amplifier according to the first power supply voltage; wherein the preset voltage is used to power the voltage conversion circuit, and the voltage value of the first power supply voltage is linearly related to the voltage value of the second power supply voltage. Through this technical solution, not only can the power supply pressure of the power supply of the power amplifier circuit be reduced, but also the oscillation caused by the formation of a power supply loop can be avoided, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0008] Furthermore, the second power amplifier is configured as one, the power supply end of the first power amplifier is used to receive the first power supply voltage, the power supply end of the voltage conversion circuit is used to receive the preset voltage, the input end of the voltage conversion circuit is used to receive the first power supply voltage, and the output end of the voltage conversion circuit is used to output the second power supply voltage to the power supply end of the second power amplifier. Through this technical solution, the two power amplifiers in the power amplifier circuit are powered by the voltage conversion circuit and the first power supply voltage respectively, which not only reduces the load pressure of the power supply that provides the first power supply voltage, but also avoids the oscillation caused by the formation of a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0009] Furthermore, the voltage conversion circuit and the second power amplifier are respectively provided in plurality, and the number of the voltage conversion circuits is equal to that of the second power amplifiers and corresponds one to one.

[0010] Furthermore, the power supply end of the first power amplifier is used to receive the first power supply voltage, the power supply end of each voltage conversion circuit is used to receive the preset voltage, the input end of each voltage conversion circuit is used to receive the first power supply voltage, and the output end of each voltage conversion circuit outputs the second power supply voltage to the corresponding second power amplifier. Through this technical solution, it is possible to power more than two power amplifiers, reduce the load pressure of the power supply that provides the first power supply voltage, avoid oscillation caused by forming a power supply loop, and thus improve the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0011] Furthermore, the power supply end of the first power amplifier is used to receive the first power supply voltage, the power supply end of each voltage conversion circuit is used to receive the preset voltage, and in each two adjacent voltage conversion circuits, the output end of the previous voltage conversion circuit is connected to the input end of the next voltage conversion circuit, and the input end of the first voltage conversion circuit is used to receive the first power supply voltage. Through this technical solution, it is also possible to power more than two power amplifiers and reduce the load pressure of the power supply that provides the first power supply voltage.

[0012] Furthermore, the voltage conversion circuit is configured to make the preset voltage connected to the power amplifier circuit and the first power supply voltage connected to the power amplifier circuit in an open-loop state. Through this technical solution, the oscillation caused by the formation of a power supply loop between the preset voltage connected to the power amplifier circuit, the first power supply voltage connected to the power amplifier circuit, the first power amplifier and the voltage conversion circuit can be avoided.

[0013] Further, the voltage conversion circuit includes a first capacitor, a second capacitor, a first field effect transistor, a second field effect transistor, an inductor and a pulse width modulator, the two ends of the first capacitor are the input ends of the voltage conversion circuit, the two ends of the first capacitor are also connected to the drain of the first field effect transistor and the first end of the pulse width modulator respectively, the second end of the pulse width modulator is connected to the gate of the first field effect transistor, the third end of the pulse width modulator is connected to the gate of the second field effect transistor, the drain of the second field effect transistor is connected to the source of the first field effect transistor and one end of the inductor, the source of the second field effect transistor is connected to one end of the second capacitor, the other end of the second capacitor is connected to the other end of the inductor, and the two ends of the second capacitor are the output ends of the voltage conversion circuit. Through this technical solution, it is possible to avoid using a single first power supply voltage to power all power amplifiers, which not only reduces the power supply pressure of the power supply that provides the first power supply voltage, but also avoids the oscillation caused by the formation of a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0014] Furthermore, the voltage conversion circuit includes a first resistor, a second resistor, an operational amplifier, a third field effect transistor and a third capacitor, one end of the first resistor is connected to the first input end of the operational amplifier and one end of the second resistor, the other end of the first resistor is connected to the drain of the third field effect transistor and one end of the third capacitor, the drain of the third field effect transistor is the output end of the voltage conversion circuit, the second input end of the operational amplifier is connected to the reference voltage, the output end of the operational amplifier is connected to the gate of the third field effect transistor, and the third field effect transistor Q 3 The source of is the input terminal of the voltage conversion circuit 101, one end of the second resistor is connected to one end of the first resistor, and the other end of the second resistor is connected to the other end of the third capacitor. Through this technical solution, it is also possible to avoid using a single first power supply voltage to power all power amplifiers, which not only reduces the power supply pressure of the power supply that provides the first power supply voltage, but also avoids the oscillation caused by the formation of a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0015] Furthermore, the first power amplifier is cascade-connected with the second power amplifier, and the input end of the first power amplifier is connected to the output end of the second power amplifier. Through this technical solution, a circuit consisting of two cascade-connected power amplifiers can be powered, and in this case, the load pressure of the power supply that provides the first power supply voltage is reduced.

[0016] Furthermore, the first power amplifier and the second power amplifier form a differential amplifier circuit, the first power amplifier is used to receive a first differential signal, and output a first differential amplified signal after amplifying the first differential signal; the second power amplifier is used to receive a second differential signal, and output a second differential amplified signal after amplifying the second differential signal, wherein the phase of the first differential signal differs from the phase of the second differential signal by 180 degrees. Through this technical solution, the differential amplifier circuit composed of two power amplifiers can be powered, and in this case, the load pressure of the power supply that provides the first power supply voltage can be reduced.

[0017] Furthermore, the first power amplifier is cascade-connected with the plurality of second power amplifiers, the output of the first power amplifier is coupled to the signal output, the input of the first power amplifier is connected to the output of the first second power amplifier, the input of the previous second power amplifier is connected to the output of the next second power amplifier, and the input of the last second power amplifier is coupled to the signal input. Through this technical solution, a circuit composed of more than two cascade-connected power amplifiers can be powered, and in this case, the load pressure of the power supply that provides the first power supply voltage can be reduced.

[0018] Further, the first power amplifier includes at least one first amplifying transistor, the first amplifying transistor is a BJT tube, the base of the first amplifying transistor is the input terminal of the first power amplifier, the collector of the first amplifying transistor is the output terminal of the first power amplifier, and the emitter of the first amplifying transistor is connected to the ground terminal; or, the first amplifying transistor is a MOS tube, the gate of the first amplifying transistor is the input terminal of the first power amplifier, the source of the first amplifying transistor is the output terminal of the first power amplifier, and the drain of the first amplifying transistor is connected to the ground terminal;

[0019] The second power amplifier includes at least one second amplifying transistor, the second amplifying transistor is a BJT tube, the base of the second amplifying transistor is the input terminal of the second power amplifier, the collector of the second amplifying transistor is the output terminal of the second power amplifier, and the emitter of the second amplifying transistor is connected to the ground terminal; or, the second amplifying transistor is a MOS tube, the gate of the second amplifying transistor is the input terminal of the second power amplifier, the source of the second amplifying transistor is the output terminal of the second power amplifier, and the drain of the second amplifying transistor is connected to the ground terminal.

[0020] Another technical solution of the present invention is as follows: a power amplifier device is also provided, comprising a power amplifier circuit as described in any of the above technical solutions, and also comprising a battery power module and a power supply module, wherein the battery power module is used to provide the preset voltage, and the power supply module is used to provide the first supply voltage.

[0021] Another technical solution of the present invention is as follows: a radio frequency front-end module is also provided, comprising a power amplifier circuit as described in any of the above technical solutions.

[0022] A power amplifier circuit, device and radio frequency front-end module provided in an embodiment of the present application are configured such that the first power amplifier receives a first power supply voltage; the voltage conversion circuit receives a preset voltage and the first power supply voltage, and outputs a second power supply voltage according to the first power supply voltage, so that the preset voltage supplies power to the voltage conversion circuit, and the voltage value of the first power supply voltage is linearly related to the voltage value of the second power supply voltage; the second power amplifier receives the second power supply voltage; thereby not only reducing the power supply pressure of the power supply of the power amplifier circuit, but also avoiding oscillation caused by forming a power supply loop, thereby improving the stability and power added efficiency of the power amplifier circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a power amplifier circuit provided by an embodiment of the present invention;

[0024] Figure 2 A first circuit schematic diagram of a power amplifier circuit provided by an embodiment of the present invention;

[0025] Figure 3 A second circuit schematic diagram of a power amplifier circuit provided by an embodiment of the present invention;

[0026] Figure 4 A third circuit schematic diagram of a power amplifier circuit provided by an embodiment of the present invention;

[0027] Figure 5 A first circuit schematic diagram of a voltage conversion circuit provided by an embodiment of the present invention;

[0028] Figure 6 A second circuit schematic diagram of a voltage conversion circuit provided by an embodiment of the present invention;

[0029] Figure 7 A fourth circuit schematic diagram of a power amplifier circuit provided by an embodiment of the present invention;

[0030] Figure 8 This is a structural block diagram of a power amplifier device provided in an embodiment of the present invention.

[0031] Figure numerals: 100 - power amplifier circuit; 101 - voltage conversion circuit; 102 - first power amplifier; 103 - second power amplifier; 200 - power amplifier device; 201 - battery power module; 202 - power supply module. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of this application, the words "first", "second", etc. are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order. In this specification, the terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] Figure 1 1 is a schematic diagram of the structure of the power amplifier circuit of an embodiment of the present invention. It should be noted that if there is substantially the same result, the power amplifier circuit of the present invention is not limited to Figure 1 The structural diagram shown is limited. Figure 1 As shown, the power amplifier circuit 100 includes a voltage conversion circuit 101, a first power amplifier 102, and at least one second power amplifier 103 connected to the first power amplifier 102;

[0036] The first power amplifier 102 is used to receive a first supply voltage;

[0037] The voltage conversion circuit 101 is used to receive a preset voltage and the first power supply voltage, and output a second power supply voltage to the second power amplifier according to the first power supply voltage; wherein the preset voltage is used to power the voltage conversion circuit 101, and the voltage value of the first power supply voltage is linearly related to the voltage value of the second power supply voltage.

[0038] Optionally, the first power amplifier 102 and the second power amplifier 103 can be two cascaded power amplifiers. For example, the first power amplifier 102 is a driver stage amplifier, and the second power amplifier 103 is a power stage amplifier. Alternatively, the first power amplifier 102 and the second power amplifier 103 can form a differential amplifier, and the phase of the first RF input signal input to the first power amplifier 102 is 180 degrees different from the phase of the first RF input signal input to the second power amplifier 103. Alternatively, the first power amplifier 102 and the second power amplifier 103 can form a Doherty power amplifier. For example, the first power amplifier 102 is a carrier amplifier, and the second power amplifier 103 is a peak amplifier. It should be noted that this embodiment does not specifically limit the types of the first power amplifier 102 and the second power amplifier 103.

[0039] The power amplifier circuit provided in the embodiment of the present invention enables the first power amplifier 102 to receive a first power supply voltage; enables the voltage conversion circuit 101 to receive a preset voltage and the first power supply voltage, and outputs a second power supply voltage according to the first power supply voltage, so that the preset voltage supplies power to the voltage conversion circuit 101, and the voltage value of the first power supply voltage is linearly related to the voltage value of the second power supply voltage; enables the second power amplifier 103 to receive the second power supply voltage; thereby not only reducing the power supply pressure of the power supply of the power amplifier circuit, but also avoiding oscillation caused by forming a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0040] Among them, the voltage conversion circuit makes the voltage value of the first power supply voltage and the voltage value of the second power supply voltage have a linear relationship, so that the voltage value of the second power supply voltage input to the power supply terminal VCC1 of the second power amplifier 103 can be adjusted by adjusting the voltage value of the first power supply voltage or by configuring the voltage conversion circuit.

[0041] In a specific embodiment, the voltage value of the first power supply voltage and the voltage value of the second power supply voltage are linearly related and can be expressed by the expression V 2 =aV 1 +b means, V 1 is the voltage value of the first power supply voltage, V 2 is the voltage value of the second power supply voltage, a and b are parameters, a can be 0.5-1.5; for example, when a is 0.9 and b is 0, if V 1 is 10V, then V 2 is 9V, if V 1 is 5V, then V2 is 4.5V.

[0042] In some embodiments, the second power amplifier 103 is configured as one, the power supply end of the first power amplifier 102 is used to receive the first power supply voltage, the power supply end of the voltage conversion circuit 101 is used to receive the preset voltage, the input end of the voltage conversion circuit 101 is used to receive the first power supply voltage, and the output end of the voltage conversion circuit 101 is used to output the second power supply voltage to the power supply end of the second power amplifier 103.

[0043] In a specific embodiment, the first circuit schematic diagram of the power amplifier circuit is as follows: Figure 2 As shown, the preset voltage Vbatt can be provided by a battery power module 201, the power battery module can be a power battery, and the first power supply voltage is provided by a power supply module 202, wherein the power supply module 202 can be a power management chip (PowerManagement Unit, PMU), the voltage Vbat output by the power battery module is a fixed voltage, and the voltage VCC output by the power supply module 202 is a variable voltage, and the voltage VCC output by the power supply module 202 can be adjusted according to the power supply mode (APT mode or ET mode) of the power amplifier. It can be understood that the present application is connected through a voltage conversion circuit, and the voltage conversion circuit makes the voltage value of the first power supply voltage and the voltage value of the second power supply voltage linearly related. Therefore, under the premise that the first power supply voltage can be adjusted according to the power supply mode (APT mode or ET mode) of the power amplifier, the second power supply voltage input to the power supply end of the second power amplifier 103 can also be adjusted according to the power supply mode (APT mode or ET mode) of the power amplifier.

[0044] In the embodiment of the present invention, power is supplied to two power amplifiers in the power amplifier circuit respectively through a voltage conversion circuit and a first power supply voltage, which not only reduces the load pressure of the power supply that provides the first power supply voltage, but also avoids oscillation caused by the formation of a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0045] In some implementations, the voltage conversion circuit 101 and the second power amplifier 103 are respectively provided in plurality, and the number of the voltage conversion circuit 101 and the number of the second power amplifier 103 are equal and correspond one to one.

[0046] In some embodiments, the power supply end of the first power amplifier 102 is used to receive the first power supply voltage, the power supply end of each of the voltage conversion circuits 101 is used to receive the preset voltage, the input end of each of the voltage conversion circuits 101 is used to receive the first power supply voltage, and the output end of each of the voltage conversion circuits 101 outputs the second power supply voltage to the corresponding second power amplifier 103.

[0047] The embodiments of the present invention can not only realize power supply for more than two power amplifiers and reduce the load pressure of the power supply that provides the first power supply voltage, but also avoid oscillation caused by forming a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0048] In a specific embodiment, the second circuit schematic diagram of the power amplifier circuit is as follows: Figure 3 As shown, Figure 3 In the embodiment, two voltage conversion circuits 101 and two second power amplifiers 103 are respectively provided, the power supply end of the first power amplifier 102 receives the first power supply voltage, and the power supply ends of the two voltage conversion circuits 101 respectively receive the preset voltage. Optionally, the preset voltage received by the power supply ends of the two voltage conversion circuits 101 can be provided by the same battery power module or by different battery power modules. The input ends of the two voltage conversion circuits 101 both receive the first power supply voltage, and the output ends of the two voltage conversion circuits 101 respectively output the second power supply voltage to the corresponding second power amplifier 103. It can be understood that the second power supply voltage output by the two voltage conversion circuits 101 to the corresponding second power amplifier 103 is linearly related to the first power supply voltage. If the two voltage conversion circuits 101 are exactly the same, the second power supply voltage output by the two voltage conversion circuits 101 to the corresponding second power amplifier 103 is the same. If the configurations of the two voltage conversion circuits 101 are different, the second supply voltages output by the two voltage conversion circuits 101 to the corresponding second power amplifier 103 may be the same or different. That is, by configuring the voltage conversion circuit 101, the linear ratio between the second supply voltage and the first supply voltage can be adjusted.

[0049] In some embodiments, the power supply end of the first power amplifier 102 is used to receive the first power supply voltage, and the power supply end of each of the voltage conversion circuits 101 is used to receive the preset voltage. Optionally, the preset voltage received by the power supply end of each of the voltage conversion circuits 101 can be provided by the same battery power module or by different battery power modules. In each of the two adjacent voltage conversion circuits 101, the output end of the previous voltage conversion circuit 101 is connected to the input end of the next voltage conversion circuit 101, and the input end of the first voltage conversion circuit 101 is used to receive the first power supply voltage.

[0050] As an example, since the present embodiment includes a plurality of voltage conversion circuits 101 and a corresponding plurality of second power amplifiers 103. Therefore, in the present embodiment, the input end of the first voltage conversion circuit 101 arranged adjacent to the first power amplifier 102 is used to receive the first power supply voltage, that is, the second power supply voltage output by the first voltage conversion circuit 101 is in a linear relationship with the first power supply voltage. Secondly, the input end of the second voltage conversion circuit 101 is connected to the second power supply voltage output by the first voltage conversion circuit 101, that is, the second power supply voltage output by the second voltage conversion circuit 101 is in a linear relationship with the second power supply voltage output by the first voltage conversion circuit 101, and so on, in each of the two adjacent voltage conversion circuits 101, the output end of the previous voltage conversion circuit 101 is connected to the input end of the next voltage conversion circuit 101, that is, the second power supply voltage output by the next voltage conversion circuit 101 is in a linear relationship with the second power supply voltage output by the previous voltage conversion circuit. It should be noted that, in this embodiment, the voltage conversion circuit 101 disposed adjacent to the first power amplifier 102 is taken as the first voltage conversion circuit 101 , and the voltage conversion circuit disposed farther away from the first power amplifier 102 is taken as the later voltage conversion circuit.

[0051] The embodiment of the present invention can also not only power more than two power amplifiers and reduce the load pressure of the power supply that provides the first power supply voltage, but also avoid oscillation caused by forming a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0052] In a specific embodiment, the third circuit schematic diagram of the power amplifier circuit is as follows: Figure 4 As shown, Figure 4In the embodiment, two voltage conversion circuits 101 and two second power amplifiers 103 are respectively provided, a power supply end of the first power amplifier 102 receives the first power supply voltage, power supply ends of the two voltage conversion circuits 101 respectively receive the preset voltage, an output end of the previous voltage conversion circuit 101 is connected to an input end of the next voltage conversion circuit 101, and an input end of the first voltage conversion circuit 101 is used to receive the first power supply voltage.

[0053] In some embodiments, the voltage conversion circuit 101 is configured to make the preset voltage connected to the power amplifier circuit and the first power supply voltage connected to the power amplifier circuit in an open-loop state. It should be noted that the preset voltage connected to the power amplifier circuit and the first power supply voltage connected to the power amplifier circuit are in an open-loop state, that is, the preset voltage and the first power supply voltage are not connected, and a feedback loop cannot be formed.

[0054] In the embodiment of the present invention, by making the preset voltage connected to the power amplifier circuit and the first power supply voltage connected to the power amplifier circuit in an open-loop state, it is possible to avoid the preset voltage connected to the power amplifier circuit and the first power supply voltage connected to the power amplifier circuit from forming a power supply loop, which may cause the power amplifier circuit to oscillate, thereby affecting the stability and power added efficiency of the power amplifier circuit.

[0055] In some implementations, the first circuit schematic diagram of the voltage conversion circuit 101 is as follows: Figure 5 The voltage conversion circuit 101 includes a first capacitor C IN , the second capacitor C o , the first field effect transistor Q 1 , the second field effect transistor Q 2 、Inductance L O and pulse width modulator PWM, the first capacitor C IN The two ends of the first capacitor C are the input ends of the voltage conversion circuit 101. IN The two ends of the first field effect transistor Q 1 The drain of the first field effect transistor Q is connected to the first end of the pulse width modulator PWM, and the second end of the pulse width modulator PWM is connected to the first field effect transistor Q 1 The gate of the pulse width modulator PWM is connected to the gate of the second field effect transistor Q 2 The gate of the second field effect transistor Q 2 The drain of the first field effect transistor Q 1 The source and the inductor L O One end of the second field effect transistor Q2 The source of the second capacitor C o One end of the second capacitor C o The other end is connected to the other end of the inductor L O , the second capacitor C o The two ends of are the output ends of the voltage conversion circuit 101. Figure 5 In the resistor R O is the load resistance.

[0056] The embodiment of the present invention can realize outputting the second power supply voltage according to the first power supply voltage, and make the voltage value of the first power supply voltage and the voltage value of the second power supply voltage have a linear relationship, thereby avoiding using the first power supply voltage alone to power all power amplifiers, which not only reduces the power supply pressure of the power supply power supply providing the first power supply voltage, but also avoids the oscillation caused by the formation of a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0057] In some implementations, the second circuit schematic diagram of the voltage conversion circuit 101 is as follows: Figure 6 The voltage conversion circuit 101 includes a first resistor R 1 , the second resistor R 2 , operational amplifier EA, third field effect transistor Q 3 And the third capacitor C a , the first resistor R 1 One end is connected to the first input end of the operational amplifier EA and the second resistor R 2 One end of the first resistor R 1 The other end is connected to the third field effect transistor Q 3 The drain and the third capacitor C a One end of the third field effect transistor Q 3 The drain of is the output terminal of the voltage conversion circuit 101, and the second input terminal of the operational amplifier EA is connected to the reference voltage V REF The output terminal of the operational amplifier EA is connected to the third field effect transistor Q 3 The gate of the third field effect transistor Q 3 The source of is the input terminal of the voltage conversion circuit 101, and the second resistor R 2 One end of the first resistor R 1 One end of the second resistor R 2 The other end is connected to the third capacitor C a The other end of Figure 6 In the resistor R L is the load resistance.

[0058] The embodiment of the present invention can also avoid using a single first power supply voltage to power all power amplifiers, which not only reduces the power supply pressure of the power supply that provides the first power supply voltage, but also avoids oscillation caused by forming a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0059] In some implementations, the first power amplifier 102 and the second power amplifier 103 are connected in cascade, and an input end of the first power amplifier 102 is connected to an output end of the second power amplifier 103 .

[0060] The embodiment of the present invention can supply power to a circuit composed of two cascade-connected power amplifiers, and in this case, reduce the load pressure of a power supply that provides a first power supply voltage.

[0061] In some implementations, a fourth circuit schematic diagram of the power amplifier circuit is as follows: Figure 7 The first power amplifier 102 and the second power amplifier 103 form a differential amplifier circuit, wherein the first power amplifier 102 is used to receive a first differential signal, and output a first differential amplified signal after amplifying the first differential signal; the second power amplifier 103 is used to receive a second differential signal, and output a second differential amplified signal after amplifying the second differential signal, wherein the phase of the first differential signal differs from the phase of the second differential signal by 180 degrees.

[0062] The embodiment of the present invention can provide power for a differential amplifier circuit composed of two power amplifiers, and in this case, reduce the load pressure of a power supply that provides a first power supply voltage.

[0063] In some embodiments, the first power amplifier 102 is cascaded with the multiple second power amplifiers 103, the output of the first power amplifier 102 is coupled to the signal output, the input of the first power amplifier 102 is connected to the output of the first second power amplifier 103, the input of the previous second power amplifier 103 is connected to the output of the next second power amplifier 103, and the input of the last second power amplifier 103 is coupled to the signal input.

[0064] The embodiment of the present invention can provide power for a circuit composed of two or more cascade-connected power amplifiers, and in this case, reduce the load pressure of a power supply that provides a first power supply voltage.

[0065] In some embodiments, the first power amplifier 102 includes at least one first amplifying transistor, the first amplifying transistor is a BJT tube, the base of the first amplifying transistor is the input terminal of the first power amplifier 102, the collector of the first amplifying transistor is the output terminal of the first power amplifier 102, and the emitter of the first amplifying transistor is connected to the ground terminal; or, the first amplifying transistor is a MOS tube, the gate of the first amplifying transistor is the input terminal of the first power amplifier 102, the source of the first amplifying transistor is the output terminal of the first power amplifier 102, and the drain of the first amplifying transistor is connected to the ground terminal;

[0066] The second power amplifier 103 includes at least one second amplifying transistor, the second amplifying transistor is a BJT tube, the base of the second amplifying transistor is the input terminal of the second power amplifier 103, the collector of the second amplifying transistor is the output terminal of the second power amplifier 103, and the emitter of the second amplifying transistor is connected to the ground terminal; or, the second amplifying transistor is a MOS tube, the gate of the second amplifying transistor is the input terminal of the second power amplifier 103, the source of the second amplifying transistor is the output terminal of the second power amplifier 103, and the drain of the second amplifying transistor is connected to the ground terminal.

[0067] The power amplifier circuit provided in the embodiment of the present invention enables the first power amplifier 102 to receive a first power supply voltage; enables the voltage conversion circuit 101 to receive a preset voltage and the first power supply voltage, and outputs a second power supply voltage according to the first power supply voltage, so that the preset voltage supplies power to the voltage conversion circuit 101, and the voltage value of the first power supply voltage is linearly related to the voltage value of the second power supply voltage; enables the second power amplifier 103 to receive the second power supply voltage; thereby not only reducing the power supply pressure of the power supply of the power amplifier circuit, but also avoiding oscillation caused by forming a power supply loop, thereby improving the stability, power added efficiency and adjacent channel leakage ratio of the power amplifier circuit.

[0068] The structural block diagram of the power amplifier device according to the embodiment of the present invention is as follows: Figure 8 As shown, the power amplifier device 200 includes the power amplifier circuit 100 described in any of the above embodiments, and also includes a battery power module 201 and a power supply module 202, wherein the battery power module 201 is used to provide the preset voltage Vbatt, and the power supply module 202 is used to provide the first power supply voltage VCC, wherein the battery power module 201 can be a battery power module for powering the bias transistor in the bias circuit, and can also be an independent battery power module 201.

[0069] An embodiment of the present invention provides a radio frequency front-end module, comprising the power amplifier circuit described in any embodiment.

[0070] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above embodiments only express the preferred implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A power amplifier circuit, characterized in that: comprising a voltage conversion circuit, a first power amplifier and at least one second power amplifier connected to the first power amplifier; The first power amplifier is used to receive a first supply voltage; The voltage conversion circuit is used to receive a preset voltage and the first power supply voltage, and output a second power supply voltage to the second power amplifier according to the first power supply voltage; wherein the preset voltage is used to power the voltage conversion circuit, and a voltage value of the first power supply voltage is linearly related to a voltage value of the second power supply voltage; The voltage conversion circuit includes a first capacitor, a second capacitor, a first field effect transistor, a second field effect transistor, an inductor and a pulse width modulator, wherein two ends of the first capacitor are input ends of the voltage conversion circuit, two ends of the first capacitor are respectively connected to the drain of the first field effect transistor and the first end of the pulse width modulator, the second end of the pulse width modulator is connected to the gate of the first field effect transistor, the third end of the pulse width modulator is connected to the gate of the second field effect transistor, the drain of the second field effect transistor is connected to the source of the first field effect transistor and one end of the inductor, the source of the second field effect transistor is connected to one end of the second capacitor, the other end of the second capacitor is connected to the other end of the inductor, and two ends of the second capacitor are output ends of the voltage conversion circuit; Alternatively, the voltage conversion circuit includes a first resistor, a second resistor, an operational amplifier, a third field effect transistor and a third capacitor, one end of the first resistor is connected to the first input end of the operational amplifier and one end of the second resistor, the other end of the first resistor is connected to the drain of the third field effect transistor and one end of the third capacitor, the drain of the third field effect transistor is the output end of the voltage conversion circuit, the second input end of the operational amplifier is connected to a reference voltage, the output end of the operational amplifier is connected to the gate of the third field effect transistor, the source of the third field effect transistor is the input end of the voltage conversion circuit, one end of the second resistor is connected to one end of the first resistor, and the other end of the second resistor is connected to the other end of the third capacitor.

2. The power amplifier circuit according to claim 1, characterized in that: The second power amplifier is set as one, the power supply end of the first power amplifier is used to receive the first power supply voltage, the power supply end of the voltage conversion circuit is used to receive the preset voltage, the input end of the voltage conversion circuit is used to receive the first power supply voltage, and the output end of the voltage conversion circuit is used to output the second power supply voltage to the power supply end of the second power amplifier.

3. The power amplifier circuit according to claim 1, characterized in that: The voltage conversion circuit and the second power amplifier are respectively provided in plurality, and the number of the voltage conversion circuits is equal to that of the second power amplifiers and corresponds one to one.

4. The power amplifier circuit according to claim 3, characterized in that: The power supply end of the first power amplifier is used to receive the first power supply voltage, the power supply end of each voltage conversion circuit is used to receive the preset voltage, the input end of each voltage conversion circuit is used to receive the first power supply voltage, and the output end of each voltage conversion circuit outputs the second power supply voltage to the corresponding second power amplifier.

5. The power amplifier circuit according to claim 3, characterized in that: The power supply end of the first power amplifier is used to receive the first power supply voltage, and the power supply end of each voltage conversion circuit is used to receive the preset voltage respectively. In each two adjacent voltage conversion circuits, the output end of the previous voltage conversion circuit is connected to the input end of the next voltage conversion circuit, and the input end of the first voltage conversion circuit is used to receive the first power supply voltage.

6. The power amplifier circuit according to any one of claims 2 to 5, characterized in that: The voltage conversion circuit is configured to make the preset voltage connected to the power amplifier circuit and the first power supply voltage connected to the power amplifier circuit in an open-loop state.

7. The power amplifier circuit according to claim 2, characterized in that: The first power amplifier is cascade-connected to the second power amplifier, and an input end of the first power amplifier is connected to an output end of the second power amplifier.

8. The power amplifier circuit according to claim 2, characterized in that: The first power amplifier and the second power amplifier form a differential amplifier circuit, the first power amplifier is used to receive a first differential signal, and output a first differential amplified signal after amplifying the first differential signal; the second power amplifier is used to receive a second differential signal, and output a second differential amplified signal after amplifying the second differential signal, wherein the phase of the first differential signal differs from the phase of the second differential signal by 180 degrees.

9. The power amplifier circuit according to claim 3, characterized in that: The first power amplifier is cascade-connected to the multiple second power amplifiers, the output end of the first power amplifier is coupled to the signal output end, the input end of the first power amplifier is connected to the output end of the first second power amplifier, the input end of the previous second power amplifier is connected to the output end of the next second power amplifier, and the input end of the last second power amplifier is coupled to the signal input end.

10. The power amplifier circuit according to claim 1, characterized in that: The first power amplifier includes at least one first amplifying transistor, the first amplifying transistor is a BJT tube, the base of the first amplifying transistor is the input terminal of the first power amplifier, the collector of the first amplifying transistor is the output terminal of the first power amplifier, and the emitter of the first amplifying transistor is connected to the ground terminal; or, the first amplifying transistor is a MOS tube, the gate of the first amplifying transistor is the input terminal of the first power amplifier, the source of the first amplifying transistor is the output terminal of the first power amplifier, and the drain of the first amplifying transistor is connected to the ground terminal; The second power amplifier includes at least one second amplifying transistor, the second amplifying transistor is a BJT tube, the base of the second amplifying transistor is the input terminal of the second power amplifier, the collector of the second amplifying transistor is the output terminal of the second power amplifier, and the emitter of the second amplifying transistor is connected to the ground terminal; or, the second amplifying transistor is a MOS tube, the gate of the second amplifying transistor is the input terminal of the second power amplifier, the source of the second amplifying transistor is the output terminal of the second power amplifier, and the drain of the second amplifying transistor is connected to the ground terminal.

11. A power amplifier device, characterized in that: The power amplifier circuit comprises the power amplifier circuit as described in any one of claims 1 to 10, and further comprises a battery power module and a power supply module, wherein the battery power module is used to provide the preset voltage, and the power supply module is used to provide the first supply voltage.

12. A radio frequency front-end module, characterized in that: A power amplifier circuit comprising any one of claims 1-10.

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