A radio frequency power amplifier and radio frequency module

Abstract

The application provides a radio frequency power amplifier and a radio frequency module, which comprise a substrate input unit, a power amplifier unit and a substrate output unit; the power amplifier unit comprises a first input radio frequency matching network, a first driving stage power amplifier, a first inter-stage matching network, a first amplification stage power amplifier, a second input radio frequency matching network, a second driving stage power amplifier, a second inter-stage matching network, a second amplification stage power amplifier, a twelfth capacitor, a thirteenth capacitor and a ninth capacitor; the first input radio frequency matching network comprises a third capacitor and a third inductor; the first inter-stage matching network comprises a seventh inductor, a fifth capacitor, a fifth inductor and a seventh capacitor; the second input radio frequency matching network comprises a fourth capacitor and a fourth inductor; and the second inter-stage matching network comprises an eighth inductor, a sixth capacitor, a sixth inductor and an eighth capacitor. The technical scheme of the application has a high working frequency bandwidth and a good harmonic suppression effect when the output power is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit, in particular to a radio frequency power amplifier and a radio frequency module. BACKGROUND

[0002] At present, in the satellite communication system, the radio frequency front end has a greater impact on the communication quality, and the radio frequency power amplifier is a key device of the radio frequency front end.

[0003] The radio frequency power amplifier of the related art generally comprises a driver amplifier, a first input matching network, a carrier power amplifier, a second input matching network, a peak power amplifier, a first output matching network and a second output matching network.

[0004] However, the radio frequency power amplifier of the related art is used in the satellite communication system. Modern satellite communication is mainly applied to areas where ordinary mobile communication signals cannot cover (such as uninhabited areas, deserts, oceans, polar regions, etc.) or communication base stations are damaged (such as earthquakes, floods, typhoons, etc.). Since the communication environment is more severe and complex, and the communication distance between the terminal and the satellite is much farther than the cellular mobile network, the accuracy and stability of the communication system are particularly critical. When the handheld wireless terminal is working normally, it can directly transmit and receive information through satellite signals with the satellite and the ground monitoring center station, and the communication mode is in the form of short messages as the basic unit of transmission. Compared with cellular mobile communication, since the distance is farther, the radio frequency power amplifier, as a key device of the radio frequency front end, needs to output higher saturation power. When the radio frequency power amplifier outputs high power, it usually works in the nonlinear region, which will generate a series of harmonic components. When the radio frequency power amplifier module works at high power output and saturation output, it is difficult to simultaneously achieve a wide working frequency and high harmonic suppression.

[0005] Therefore, it is necessary to provide a new radio frequency power amplifier and module to solve the above problems. SUMMARY

[0006] In view of the above deficiencies of the prior art, the present application provides a radio frequency power amplifier and a radio frequency module with high working frequency and high output power, and good harmonic suppression effect.

[0007] To solve the above technical problems, in a first aspect, an embodiment of the present application provides a radio frequency power amplifier, which comprises a substrate input unit, a power amplifier unit and a substrate output unit connected in sequence.

[0008] The substrate input unit is used for receiving an external single-ended signal and converting it into two first signals with the same power and a phase difference of 180°.

[0009] The power amplifier unit is used for amplifying power of two paths of the first signals to generate two paths of second signals;

[0010] The substrate output unit is used for receiving the two paths of the second signals to perform power synthesis and conversion into a third signal, and outputting the third signal after suppressing harmonics of the third signal;

[0011] The power amplifier unit comprises a first input radio frequency matching network, a first driving stage power amplifier, a first inter-stage matching network, a first amplification stage power amplifier, a second input radio frequency matching network, a second driving stage power amplifier, a second inter-stage matching network, a second amplification stage power amplifier, a twelfth capacitor, a thirteenth capacitor and a ninth capacitor; the first input radio frequency matching network comprises a third capacitor and a third inductor; the first inter-stage matching network comprises a seventh inductor, a fifth capacitor, a fifth inductor and a seventh capacitor; the second input radio frequency matching network comprises a fourth capacitor and a fourth inductor; the second inter-stage matching network comprises an eighth inductor, a sixth capacitor, a sixth inductor and an eighth capacitor;

[0012] A first end of the third capacitor is used as a first input end of the power amplifier unit, and the first end of the third capacitor is connected to a first end of the third inductor, and a second end of the third inductor is grounded;

[0013] A second end of the third capacitor is connected to an input end of the first driving stage power amplifier;

[0014] Output ends of the first driving stage power amplifier are respectively connected to a second end of the seventh inductor and a first end of the fifth capacitor;

[0015] A first end of the seventh inductor is respectively connected to a first power supply voltage, a first end of the eighth inductor, a first end of the twelfth capacitor and a first end of the thirteenth capacitor, a second end of the twelfth capacitor is grounded, and a second end of the thirteenth capacitor is grounded;

[0016] A second end of the fifth capacitor is respectively connected to a first end of the fifth inductor and a first end of the seventh capacitor, and a second end of the fifth inductor is grounded;

[0017] A second end of the seventh capacitor is connected to an input end of the first amplification stage power amplifier;

[0018] An output end of the first amplification stage power amplifier is used as a first output end of the power amplifier unit, and the output end of the first amplification stage power amplifier is connected to a first end of the ninth capacitor;

[0019] The first end of the fourth capacitor is a second input end of the power amplifier unit, and the first end of the fourth capacitor is connected to the first end of the fourth inductor, and the second end of the fourth inductor is grounded;

[0020] The second end of the fourth capacitor is connected to the input end of the second driving stage power amplifier;

[0021] The output end of the second driving stage power amplifier is respectively connected to the second end of the eighth inductor and the first end of the sixth capacitor;

[0022] The second end of the sixth capacitor is respectively connected to the first end of the sixth inductor and the first end of the eighth capacitor, and the second end of the sixth inductor is grounded;

[0023] The second end of the eighth capacitor is connected to the input end of the second amplification stage power amplifier;

[0024] The output end of the second amplification stage power amplifier is a second output end of the power amplifier unit, and the output end of the second amplification stage power amplifier is connected to the second end of the ninth capacitor.

[0025] Preferably, the substrate input unit is an LC concentrated balun.

[0026] Preferably, the substrate input unit comprises a first capacitor, a second capacitor, a first inductor and a second inductor;

[0027] The first end of the first capacitor is an input end of the substrate input unit, and the first end of the first capacitor is connected to the first end of the second inductor;

[0028] The second end of the first capacitor is a first output end of the substrate input unit, and the second end of the first capacitor is connected to the first end of the first inductor, and the second end of the first inductor is grounded;

[0029] The second end of the second inductor is a second output end of the substrate input unit, and the second end of the second inductor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.

[0030] Preferably, the substrate output unit comprises a transformer, a tenth capacitor, an eleventh capacitor, a fourteenth capacitor, a series resonance network and an output matching circuit;

[0031] The series resonance network is used to suppress harmonics of four orders or more;

[0032] The output matching circuit is used to match the output impedance;

[0033] The first end of the primary coil of the transformer is as the first input end of the substrate output unit; the second end of the primary coil of the transformer is as the second input end of the substrate output unit;

[0034] The center tap end of the primary coil of the transformer is connected to the first end of the tenth capacitor, the first end of the fourteenth capacitor and the second power voltage, the second end of the tenth capacitor is grounded, and the second end of the fourteenth capacitor is grounded;

[0035] The first end of the secondary coil of the transformer is connected to the interface end of the series resonance network and the input end of the output matching circuit respectively;

[0036] The second end of the secondary coil of the transformer is connected to the first end of the eleventh capacitor, and the second end of the eleventh capacitor is grounded;

[0037] The output end of the output matching circuit is as the output end of the substrate output unit.

[0038] Preferably, the series resonance network comprises a fifteenth capacitor, a sixteenth capacitor, a ninth inductor and a tenth inductor;

[0039] The first end of the fifteenth capacitor is as the interface end of the series resonance network, and the first end of the fifteenth capacitor is connected to the first end of the sixteenth capacitor;

[0040] The second end of the fifteenth capacitor is connected to the first end of the ninth inductor, and the second end of the ninth inductor is grounded;

[0041] The second end of the sixteenth capacitor is connected to the first end of the tenth inductor, and the second end of the tenth inductor is grounded.

[0042] Preferably, the output matching circuit comprises a first low-pass matching network, a second low-pass matching network, a third low-pass matching network and a band-stop matching network connected in sequence.

[0043] Preferably, the first low-pass matching network comprises an eleventh inductor, a seventeenth capacitor and a twelfth inductor;

[0044] The second low-pass matching network comprises a thirteenth inductor, an eighteenth capacitor and a fourteenth inductor;

[0045] The third low-pass matching network comprises a fifteenth inductor, a nineteenth capacitor and a sixteenth inductor;

[0046] The band-stop matching network comprises a twentieth capacitor and a seventeenth inductor;

[0047] The first end of the eleventh inductor is as the input end of the output matching circuit;

[0048] a second end of the eleventh inductor is connected to a first end of the seventeenth capacitor and a first end of the thirteenth inductor respectively; a second end of the seventeenth capacitor is connected to a first end of the twelfth inductor, and a second end of the twelfth inductor is grounded;

[0049] a second end of the thirteenth inductor is connected to a first end of the eighteenth capacitor and a first end of the fifteenth inductor respectively; a second end of the eighteenth capacitor is connected to a first end of the fourteenth inductor, and a second end of the fourteenth inductor is grounded;

[0050] a second end of the fifteenth inductor is connected to a first end of the nineteenth capacitor, a first end of the twentieth capacitor and a first end of the seventeenth inductor respectively; a second end of the nineteenth capacitor is connected to a first end of the sixteenth inductor, and a second end of the sixteenth inductor is grounded;

[0051] a second end of the twentieth capacitor is an input end of the output matching circuit, and the second end of the twentieth capacitor is connected to a second end of the seventeenth inductor.

[0052] Preferably, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor and the ninth capacitor are all STACK capacitors or MIM capacitors.

[0053] In a second aspect, an embodiment of the present application further provides a radio frequency module, which comprises a substrate and a radio frequency power amplifier as described above and provided by an embodiment of the present application welded to the substrate.

[0054] Preferably, the power amplifier unit is a semiconductor chip; and the substrate input unit and the substrate output unit are both made of a plurality of discrete components.

[0055] Compared with the related art, the radio frequency power amplifier and the radio frequency module of the present application have the first inter-stage matching network and the second inter-stage matching network arranged in the power amplifier unit, wherein the first inter-stage matching network comprises the seventh inductor, the fifth capacitor, the fifth inductor and the seventh capacitor; the second inter-stage matching network comprises the eighth inductor, the sixth capacitor, the sixth inductor and the eighth capacitor; the first inter-stage matching network and the second inter-stage matching network improve the frequency bandwidth of the matching network, and further improve the working bandwidth of the radio frequency power amplifier, so that the radio frequency power amplifier has a high working bandwidth. More preferably, the radio frequency power amplifier of the present application has the substrate input unit and the substrate output unit arranged in front of and behind the power amplifier unit respectively, and the balun of the substrate input unit and the transformer of the substrate output unit constitute a differential power amplifier, and the differential structure itself can also realize the function of enhancing the suppression of the even harmonics. The series resonance network of the substrate output unit suppresses the fourth order harmonics and above; the output matching circuit of the substrate output unit realizes the suppression of the second order harmonics and the third order harmonics. Thus, the radio frequency power amplifier and the radio frequency module of the present application have a good harmonic suppression effect when the output power is high. BRIEF DESCRIPTION OF DRAWINGS

[0056] The present application will be described in detail below with reference to the accompanying drawings. The above and other aspects of the present application will become more apparent and more readily appreciated from the following detailed description, taken in conjunction with the accompanying drawings, in which:

[0057] Figure 1 It is a circuit structure schematic diagram of the radio frequency power amplifier of the related art;

[0058] Figure 2 It is a circuit diagram of the substrate input unit of the radio frequency power amplifier of the present application;

[0059] Figure 3 It is a circuit diagram of the substrate output unit of the radio frequency power amplifier of the present application;

[0060] Figure 4 It is a gain-frequency relationship curve diagram of the radio frequency power amplifier provided by the embodiment of the present application;

[0061] Figure 5 It is a gain-output power relationship curve diagram of the radio frequency power amplifier provided by the embodiment of the present application. DETAILED DESCRIPTION

[0062] The specific embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0063] The specific embodiments described herein are presented for purposes of illustration and description. They are not intended to be exhaustive of or to limit this application to the precise forms described. Many modifications and variations are possible in view of the above teachings. They are chosen and described in order to best explain the aspects of this application and its best mode and to enable others skilled in the art to best use it in various embodiments and with various modifications as are suited to the particular use contemplated.

[0064] (E1)

[0065] The embodiment of the present application provides a radio frequency power amplifier 100.

[0066] Please refer to Figure 1 , Figure 1 is a circuit structure schematic diagram of a radio frequency power amplifier 100 in the related art. Specifically, the radio frequency power amplifier 100 comprises a substrate input unit 1, a power amplifier unit 2 and a substrate output unit 3 connected in sequence.

[0067] The circuit connection relationship of the radio frequency power amplifier 100 is as follows:

[0068] The input end of the substrate input unit 1 is used as the input end RFin of the radio frequency power amplifier 100.

[0069] The first output end of the substrate input unit 1 is connected to the first input end of the power amplifier unit 2. The second output end of the substrate input unit 1 is connected to the second input end of the power amplifier unit 2.

[0070] The first output end of the power amplifier unit 2 is connected to the first input end of the substrate output unit 3.

[0071] The second output end of the power amplifier unit 2 is connected to the second input end of the substrate output unit 3.

[0072] The output end of the substrate output unit 3 is used as the output end RFout of the radio frequency power amplifier 100.

[0073] The substrate input unit 1 is used for receiving an external single-end signal and converting it into two first signals with the same power and a phase difference of 180°. The substrate input unit 1 is also used for matching the input end RFin of the radio frequency power amplifier 100 to 50 ohms.

[0074] In the embodiment, the substrate input unit 1 is an LC lumped balun. The LC lumped balun has the advantages of flexibility, the substrate input unit 1 is built on the off-chip substrate by using SMD components, effectively reducing the chip area, reducing the dependence on semiconductor manufacturer manufacturing process, saving cost; in addition, the advantage of the LC lumped balun is that 180° phase difference can be realized in a larger working frequency band bandwidth.

[0075] Please refer to Figure 2 Figure 2 It is a circuit diagram of the substrate input unit 1 of the radio frequency power amplifier 100. Specifically, the substrate input unit 1 includes a first capacitor, a second capacitor, a first inductor and a second inductor.

[0076] The circuit connection relationship of the substrate input unit 1 is as follows:

[0077] The first end of the first capacitor is used as the input end of the substrate input unit 1, and the first end of the first capacitor is connected to the first end of the second inductor.

[0078] The second end of the first capacitor is used as the first output end of the substrate input unit 1, and the second end of the first capacitor is connected to the first end of the first inductor. The second end of the first inductor is grounded GND.

[0079] The second end of the second inductor is used as the second output end of the substrate input unit 1, and the second end of the second inductor is connected to the first end of the second capacitor. The second end of the second capacitor is grounded GND.

[0080] The power amplifier unit 2 is used to amplify the power of two paths of the first signal to generate two paths of the second signal.

[0081] Specifically, the power amplifier unit 2 includes a first input radio frequency matching network 21, a first driver stage power amplifier DA1, a first inter-stage matching network 22, a first amplification stage power amplifier PA1, a second input radio frequency matching network 23, a second driver stage power amplifier DA2, a second inter-stage matching network 24, a second amplification stage power amplifier PA2, a twelfth capacitor C12, a thirteenth capacitor C13 and a ninth capacitor C9.

[0082] The first input radio frequency matching network 21 includes a third capacitor C3 and a third inductor L3.

[0083] The first inter-stage matching network 22 includes a seventh inductor L7, a fifth capacitor C5, a fifth inductor L5 and a seventh capacitor C7. The first inter-stage matching network 22 constitutes a CLCL radio frequency matching network.

[0084] ​The second input radio frequency matching network 23 comprises a fourth capacitor C4 and a fourth inductor L4.

[0085] The second inter-stage matching network 24 comprises an eighth inductor L8, a sixth capacitor C6, a sixth inductor L6 and an eighth capacitor C8. The second inter-stage matching network 24 constitutes another CLCL radio frequency matching network.

[0086] In this embodiment, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and the ninth capacitor C9 are all STACK capacitors or MIM capacitors.

[0087] The circuit connection relationship of the power amplifier unit 2 is as follows:

[0088] The first end of the third capacitor C3 serves as the first input end of the power amplifier unit 2, and the first end of the third capacitor C3 is connected to the first end of the third inductor L3. The second end of the third inductor L3 is grounded GND.

[0089] The second end of the third capacitor C3 is connected to the input end of the first driving stage power amplifier DA1.

[0090] The output end of the first driving stage power amplifier DA1 is respectively connected to the second end of the seventh inductor L7 and the first end of the fifth capacitor C5.

[0091] The first end of the seventh inductor L7 is respectively connected to a first power supply voltage VCC1, the first end of the eighth inductor L8, the first end of the twelfth capacitor C12 and the first end of the thirteenth capacitor C13. The second end of the twelfth capacitor C12 is grounded GND. The second end of the thirteenth capacitor C13 is grounded GND.

[0092] The second end of the fifth capacitor C5 is respectively connected to the first end of the fifth inductor L5 and the first end of the seventh capacitor C7. The second end of the fifth inductor L5 is grounded GND.

[0093] The second end of the seventh capacitor C7 is connected to the input end of the first amplification stage power amplifier PA1.

[0094] The output end of the first amplification stage power amplifier PA1 serves as the first output end of the power amplifier unit 2, and the output end of the first amplification stage power amplifier PA1 is connected to the first end of the ninth capacitor C9.

[0095] The first end of the fourth capacitor C4 is the second input end of the power amplifier unit 2, and the first end of the fourth capacitor C4 is connected to the first end of the fourth inductor L4. The second end of the fourth inductor L4 is grounded GND.

[0096] The second end of the fourth capacitor C4 is connected to the input end of the second driving stage power amplifier DA2.

[0097] The output end of the second driving stage power amplifier DA2 is respectively connected to the second end of the eighth inductor L8 and the first end of the sixth capacitor C6.

[0098] The second end of the sixth capacitor C6 is respectively connected to the first end of the sixth inductor L6 and the first end of the eighth capacitor C8. The second end of the sixth inductor L6 is grounded GND.

[0099] The second end of the eighth capacitor C8 is connected to the input end of the second amplification stage power amplifier PA2.

[0100] The output end of the second amplification stage power amplifier PA2 is the second output end of the power amplifier unit 2, and the output end of the second amplification stage power amplifier PA2 is connected to the second end of the ninth capacitor C9.

[0101] The first inter-stage matching network 22 is arranged between the first driving stage power amplifier DA1 and the first amplification stage power amplifier PA1 of the power amplifier unit 2, and the second inter-stage matching network 24 is arranged between the second driving stage power amplifier DA2 and the second amplification stage power amplifier PA2 of the power amplifier unit 2. Both of the two matching networks are double-stage matching, which can improve the frequency bandwidth of the matching network, and further improve the working bandwidth of the radio frequency power amplifier 100.

[0102] The seventh inductor L7 is connected to the twelfth capacitor C12, and the eighth inductor L8 is connected to the thirteenth capacitor C13. The main function of the twelfth capacitor C12 and the thirteenth capacitor C13 is to bypass the power supply of the power amplifier unit 2, so that the output power of the radio frequency power amplifier 100 is high.

[0103] The substrate output unit 3 is used for receiving two-way second signals output by the power amplifier unit 2, and then performing power synthesis to convert into one-way third signals, and then outputting the third signals after suppressing the harmonics.

[0104] Please refer to Figure 3 , Figure 3 The circuit diagram of the substrate output unit 3 of the radio frequency power amplifier 100 of the present application.

[0105] Specifically, the substrate output unit 3 comprises a transformer TF1, a tenth capacitor C10, an eleventh capacitor C11, a fourteenth capacitor C14, a series resonance network 31 and an output matching circuit 32.

[0106] The ninth capacitor C9, the tenth capacitor C10 and the eleventh capacitor C11 are respectively used for balancing port tuning capacitors of the transformer TF1, and also used for adjusting output impedance of the first amplification stage power amplifier PA1 and output impedance of the second amplification stage power amplifier PA2. The transformer TF1 can not only realize power synthesis of the input two-way differential signals, but also simultaneously plays a role of a blocking capacitor, so that the number of SMDs in the module can be reduced and cost can be saved.

[0107] The balun of the substrate input unit 1 and the transformer TF1 of the substrate output unit 3 constitute a differential power amplifier realized, which can not only realize power synthesis and improve the function of output power of the radio frequency power amplifier, but also can realize the function of enhanced suppression of even harmonics by the differential structure itself.

[0108] The circuit connection relationship of the substrate output unit 3 is as follows:

[0109] The first end of the primary coil of the transformer TF1 is used as the first input end of the substrate output unit 3. The second end of the primary coil of the transformer TF1 is used as the second input end of the substrate output unit 3.

[0110] The center tap end of the primary coil of the transformer TF1 is connected to the first end of the tenth capacitor C10, the first end of the fourteenth capacitor C14 and a second power supply voltage VCC2. The second end of the tenth capacitor C10 is grounded GND. The second end of the fourteenth capacitor C14 is grounded GND.

[0111] The first end of the secondary coil of the transformer TF1 is connected to the interface end of the series resonance network 31 and the input end of the output matching circuit 32 respectively.

[0112] The second end of the secondary coil of the transformer TF1 is connected to the first end of the eleventh capacitor C11. The second end of the eleventh capacitor C11 is grounded GND.

[0113] The output end of the output matching circuit 32 is used as the output end of the substrate output unit 3.

[0114] The series resonance network 31 is used to suppress the fourth order and above harmonics. Specifically, the series resonance network 31 includes a fifteenth capacitor C15, a sixteenth capacitor C16, a ninth inductor L9 and a tenth inductor L10. The ninth inductor L9 and the fifteenth capacitor C15 form a series resonance circuit (Trap) which mainly suppresses the fourth order and above harmonics. The tenth inductor L10 and the sixteenth capacitor C16 form another series resonance circuit (Trap) which mainly suppresses the fourth order and above harmonics. The fifteenth capacitor C15 and the sixteenth capacitor C16 are respectively used as the balance port tuning capacitors of the transformer TF1, and also realize adjusting the output impedance of the first amplification stage power amplifier PA1 and the output impedance of the second amplification stage power amplifier PA2.

[0115] The circuit connection relationship of the series resonance network 31 is as follows:

[0116] The first end of the fifteenth capacitor C15 is used as the interface end of the series resonance network 31, and the first end of the fifteenth capacitor C15 is connected to the first end of the sixteenth capacitor C16.

[0117] The second end of the fifteenth capacitor C15 is connected to the first end of the ninth inductor L9. The second end of the ninth inductor L9 is grounded GND.

[0118] The second end of the sixteenth capacitor C16 is connected to the first end of the tenth inductor L10. The second end of the tenth inductor L10 is grounded GND.

[0119] The output matching circuit 32 is used to match the output impedance.

[0120] Specifically, the output matching circuit 32 includes a first low-pass matching network 321, a second low-pass matching network 322, a third low-pass matching network 323 and a band-stop matching network 324 connected in sequence.

[0121] The first low-pass matching network 321 includes an eleventh inductor L11, a seventeenth capacitor C17 and a twelfth inductor L12. The seventeenth capacitor C17 and the twelfth inductor L12 form a series resonance circuit (Trap) which mainly suppresses the second order harmonics.

[0122] The second low-pass matching network 322 includes a thirteenth inductor L13, an eighteenth capacitor C18 and a fourteenth inductor L14. The eighteenth capacitor C18 and the fourteenth inductor L14 form a series resonance circuit (Trap) which mainly suppresses the second order harmonics.

[0123] The third low-pass matching network 323 includes a fifteenth inductor L15, a nineteenth capacitor C19, and a sixteenth inductor L16. The nineteenth capacitor C19 and the sixteenth inductor L16 form a series resonance circuit (Trap) mainly for suppressing third-order harmonics.

[0124] The band elimination matching network 324 includes a twentieth capacitor C20 and a seventeenth inductor L17. The twentieth capacitor C20 and the seventeenth inductor L17 form a parallel resonance circuit (Tank) mainly for suppressing third-order harmonics.

[0125] The circuit connection relationship of the output matching circuit 32 is as follows:

[0126] The first end of the eleventh inductor L11 is used as the input end of the output matching circuit 32.

[0127] The second end of the eleventh inductor L11 is connected to the first end of the seventeenth capacitor C17 and the first end of the thirteenth inductor L13, respectively. The second end of the seventeenth capacitor C17 is connected to the first end of the twelfth inductor L12. The second end of the twelfth inductor L12 is grounded GND.

[0128] The second end of the thirteenth inductor L13 is connected to the first end of the eighteenth capacitor C18 and the first end of the fifteenth inductor L15, respectively. The second end of the eighteenth capacitor C18 is connected to the first end of the fourteenth inductor L14. The second end of the fourteenth inductor L14 is grounded GND.

[0129] The second end of the fifteenth inductor L15 is connected to the first end of the nineteenth capacitor C19, the first end of the twentieth capacitor C20, and the first end of the seventeenth inductor L17, respectively. The second end of the nineteenth capacitor C19 is connected to the first end of the sixteenth inductor L16. The second end of the sixteenth inductor L16 is grounded GND.

[0130] The second end of the twentieth capacitor C20 is used as the input end of the output matching circuit 32, and the second end of the twentieth capacitor C20 is connected to the second end of the seventeenth inductor L17.

[0131] In this embodiment, the inductors used in the substrate output unit 3 can be in SMT form, wound inductor form, or IPD form. The capacitors used in the substrate output unit 3 can be in SMT form or IPD form.

[0132] In this embodiment, the simulation of the radio frequency power amplifier 100 verifies the high operating bandwidth of the radio frequency power amplifier 100. Please refer to Figure 4 , Figure 4A gain-frequency relationship curve of the radio frequency power amplifier 100 is provided in the embodiment of the present application. The curve S(1, 1) is an input power curve of the radio frequency power amplifier 100, and the curve S(2, 1) is an output power curve of the radio frequency power amplifier 100. Wherein, the frequency of the frequency point m7 is 1.616GHz, the gain dB(S(2, 1)) of the frequency point m7 is 32.567; the frequency of the frequency point m8 is 3.232GHz, the gain dB(S(2, 1)) of the frequency point m8 is -60.725; the frequency of the frequency point m16 is 4.848GHz, the gain dB(S(2, 1)) of the frequency point m16 is -100.900; it can be known from the gain and frequency comparison of the different frequency points m7, m8 and m16 on the graph that the working frequency bandwidth of the radio frequency power amplifier 100 is high.

[0133] In the embodiment, the saturation power of the radio frequency power amplifier 100 is verified through simulation. Figure 5 Figure 5 A gain-output power relationship curve of the radio frequency power amplifier 100 is provided in the embodiment of the present application. It can be obtained from the graph that the saturation power of the radio frequency power amplifier 100 is high.

[0134] The radio frequency module provided in the embodiment of the present application comprises a substrate and the radio frequency power amplifier 100 welded to the substrate.

[0135] In the embodiment, the power amplifier unit 2 is a semiconductor chip. The substrate input unit 1 and the substrate output unit 3 are both made of a plurality of discrete components.

[0136] The radio frequency module provided in the embodiment of the present application can realize each embodiment of the radio frequency power amplifier 100, and has corresponding beneficial effects. To avoid repetition, details are not described here.

[0137] It should be pointed out that the related circuits, transformers, capacitors, inductors and power amplifiers used in the present application are all common circuits, components in the art. The corresponding specific indexes and parameters are adjusted according to actual application, and details are not described here.

[0138] ​Compared with the related art, the radio frequency power amplifier and the radio frequency module of the present application set the first inter-stage matching network and the second inter-stage matching network in the power amplifier unit, wherein the first inter-stage matching network comprises the seventh inductor, the fifth capacitor, the fifth inductor and the seventh capacitor; the second inter-stage matching network comprises the eighth inductor, the sixth capacitor, the sixth inductor and the eighth capacitor; the first inter-stage matching network and the second inter-stage matching network improve the frequency bandwidth of the matching network, and further improve the working bandwidth of the radio frequency power amplifier, so that the working bandwidth of the radio frequency power amplifier is high. More preferably, the radio frequency power amplifier of the present application sets the substrate input unit and the substrate output unit in front of and behind the power amplifier unit respectively, the balun of the substrate input unit and the transformer of the substrate output unit constitute a differential power amplifier, and the differential structure itself can also realize the function of strengthening the suppression of even harmonics. The series resonance network of the substrate output unit suppresses the fourth order and above harmonics; the output matching circuit of the substrate output unit realizes the suppression of the second order and third order harmonics. Thus, the radio frequency power amplifier and the radio frequency module of the present application have good harmonic suppression effect when the output power is high.

[0139] It should be noted that the various embodiments described above with reference to the drawings are merely intended to illustrate the present application and not to limit the scope of the present application, and those of ordinary skill in the art should understand that modifications or equivalent replacements made to the present application without departing from the spirit and scope of the present application should be covered within the scope of the present application. In addition, unless otherwise indicated by the context, the word appearing in the singular form includes the plural form, and vice versa. In addition, unless otherwise specified, all or part of any embodiment can be used in combination with all or part of any other embodiment.

Claims

1. A radio frequency power amplifier, characterized in that, The radio frequency power amplifier includes a substrate input unit, a power amplifier unit, and a substrate output unit connected in sequence. The substrate input unit is used to receive external single-ended signals and convert them into two first signals with the same power and a phase difference of 180°. The power amplifier unit is used to amplify the power of the two first signals to generate two second signals; The substrate output unit is used to receive two second signals, perform power combining to convert them into a third signal, and suppress the harmonics of the third signal before outputting it. The power amplifier unit includes a first input RF matching network, a first driver stage power amplifier, a first interstage matching network, a first amplification stage power amplifier, a second input RF matching network, a second driver stage power amplifier, a second interstage matching network, a second amplification stage power amplifier, a twelfth capacitor, a thirteenth capacitor, and a ninth capacitor; the first input RF matching network includes a third capacitor and a third inductor; the first interstage matching network includes a seventh inductor, a fifth capacitor, a fifth inductor, and a seventh capacitor; the second input RF matching network includes a fourth capacitor and a fourth inductor; the second interstage matching network includes an eighth inductor, a sixth capacitor, a sixth inductor, and an eighth capacitor; The first terminal of the third capacitor serves as the first input terminal of the power amplifier unit, and the first terminal of the third capacitor is connected to the first terminal of the third inductor, while the second terminal of the third inductor is grounded. The second terminal of the third capacitor is connected to the input terminal of the first driver stage power amplifier; The output terminal of the first driver stage power amplifier is connected to the second terminal of the seventh inductor and the first terminal of the fifth capacitor, respectively. The first terminal of the seventh inductor is connected to the first power supply voltage, the first terminal of the eighth inductor, the first terminal of the twelfth capacitor, and the first terminal of the thirteenth capacitor, respectively. The second terminal of the twelfth capacitor is grounded, and the second terminal of the thirteenth capacitor is grounded. The second terminal of the fifth capacitor is connected to the first terminal of the fifth inductor and the first terminal of the seventh capacitor, respectively, and the second terminal of the fifth inductor is grounded; The second terminal of the seventh capacitor is connected to the input terminal of the first amplification stage power amplifier; The output terminal of the first amplification stage power amplifier serves as the first output terminal of the power amplifier unit, and the output terminal of the first amplification stage power amplifier is connected to the first terminal of the ninth capacitor. The first terminal of the fourth capacitor serves as the second input terminal of the power amplifier unit, and the first terminal of the fourth capacitor is connected to the first terminal of the fourth inductor, while the second terminal of the fourth inductor is grounded. The second terminal of the fourth capacitor is connected to the input terminal of the second driver stage power amplifier; The output terminal of the second driver stage power amplifier is connected to the second terminal of the eighth inductor and the first terminal of the sixth capacitor, respectively. The second terminal of the sixth capacitor is connected to the first terminal of the sixth inductor and the first terminal of the eighth capacitor, respectively, and the second terminal of the sixth inductor is grounded; The second terminal of the eighth capacitor is connected to the input terminal of the second amplification stage power amplifier; The output terminal of the second amplification stage power amplifier serves as the second output terminal of the power amplifier unit, and the output terminal of the second amplification stage power amplifier is connected to the second terminal of the ninth capacitor.

2. The radio frequency power amplifier according to claim 1, characterized in that, The substrate input unit is an LC balun.

3. The radio frequency power amplifier according to claim 2, characterized in that, The substrate input unit includes a first capacitor, a second capacitor, a first inductor, and a second inductor; The first terminal of the first capacitor serves as the input terminal of the substrate input unit, and the first terminal of the first capacitor is connected to the first terminal of the second inductor. The second terminal of the first capacitor serves as the first output terminal of the substrate input unit, and the second terminal of the first capacitor is connected to the first terminal of the first inductor, and the second terminal of the first inductor is grounded. The second end of the second inductor serves as the second output end of the substrate input unit, and the second end of the second inductor is connected to the first end of the second capacitor, and the second end of the second capacitor is grounded.

4. The radio frequency power amplifier according to claim 1, characterized in that, The substrate output unit includes a transformer, a tenth capacitor, an eleventh capacitor, a fourteenth capacitor, a series resonant network, and an output matching circuit. The series resonant network is used to suppress harmonics of the fourth order and above; The output matching circuit is used to match the output impedance; The first end of the primary coil of the transformer serves as the first input terminal of the substrate output unit; the second end of the primary coil of the transformer serves as the second input terminal of the substrate output unit. The center tap of the primary coil of the transformer is connected to the first terminal of the tenth capacitor, the first terminal of the fourteenth capacitor, and the second power supply voltage. The second terminal of the tenth capacitor is grounded, and the second terminal of the fourteenth capacitor is grounded. The first end of the secondary coil of the transformer is connected to the interface end of the series resonant network and the input end of the output matching circuit, respectively. The second terminal of the secondary coil of the transformer is connected to the first terminal of the eleventh capacitor, and the second terminal of the eleventh capacitor is grounded. The output terminal of the output matching circuit serves as the output terminal of the substrate output unit.

5. The radio frequency power amplifier according to claim 4, characterized in that, The series resonant network includes a fifteenth capacitor, a sixteenth capacitor, a ninth inductor, and a tenth inductor; The first terminal of the fifteenth capacitor serves as the interface terminal of the series resonant network, and the first terminal of the fifteenth capacitor is connected to the first terminal of the sixteenth capacitor. The second terminal of the fifteenth capacitor is connected to the first terminal of the ninth inductor, and the second terminal of the ninth inductor is grounded. The second terminal of the sixteenth capacitor is connected to the first terminal of the tenth inductor, and the second terminal of the tenth inductor is grounded.

6. The radio frequency power amplifier according to claim 4, characterized in that, The output matching circuit includes a first low-pass matching network, a second low-pass matching network, a third low-pass matching network, and a band-stop matching network connected in sequence.

7. The radio frequency power amplifier according to claim 6, characterized in that, The first low-pass matching network includes an eleventh inductor, a seventeenth capacitor, and a twelfth inductor; The second low-pass matching network includes a thirteenth inductor, an eighteenth capacitor, and a fourteenth inductor; The third low-pass matching network includes a fifteenth inductor, a nineteenth capacitor, and a sixteenth inductor; The band-stop matching network includes a twentieth capacitor and a seventeenth inductor; The first terminal of the eleventh inductor serves as the input terminal of the output matching circuit; The second terminal of the eleventh inductor is connected to the first terminal of the seventeenth capacitor and the first terminal of the thirteenth inductor, respectively; the second terminal of the seventeenth capacitor is connected to the first terminal of the twelfth inductor, and the second terminal of the twelfth inductor is grounded; The second terminal of the thirteenth inductor is connected to the first terminal of the eighteenth capacitor and the first terminal of the fifteenth inductor, respectively; the second terminal of the eighteenth capacitor is connected to the first terminal of the fourteenth inductor, and the second terminal of the fourteenth inductor is grounded; The second terminal of the fifteenth inductor is connected to the first terminal of the nineteenth capacitor, the first terminal of the twentieth capacitor, and the first terminal of the seventeenth inductor, respectively; the second terminal of the nineteenth capacitor is connected to the first terminal of the sixteenth inductor, and the second terminal of the sixteenth inductor is grounded; The second terminal of the twentieth capacitor serves as the input terminal of the output matching circuit, and the second terminal of the twentieth capacitor is connected to the second terminal of the seventeenth inductor.

8. The radio frequency power amplifier according to claim 1, characterized in that, The third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, and the ninth capacitor are all STACK capacitors or MIM capacitors.

9. A radio frequency module, characterized in that, The radio frequency module includes a substrate and a radio frequency power amplifier as described in any one of claims 1-8, soldered to the substrate.

10. The radio frequency module according to claim 9, characterized in that, The power amplifier unit is a semiconductor chip; the substrate input unit and the substrate output unit are both made of multiple discrete components.

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