Common-base radio frequency power amplifier

Abstract

The embodiment of the invention discloses a common-base radio frequency power amplifier. The common-base radio frequency power amplifier comprises an input balun, an output balun, at least one transistor and a feedback circuit, wherein the first input end of the input Balun receives a first signal; the second input end of the input Balun is grounded; the emitter of the transistor is connected with one output end corresponding to the input Balun; the collector electrode of the transistor is connected with one input end corresponding to the output Balun; the first output end of the output Balun outputs a second signal; the second output end of the output Balun is grounded; the feedback circuit is connected to the base of the transistor. An input balun, a transistor, and an output balun are configured to amplify a first signal to a second signal. And a feedback circuit configured to generate a feedback signal based on the input balun and / or the output balun and couple the feedback signal to the base of the transistor.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of communication, in particular to a common-base radio frequency power amplifier. BACKGROUND

[0002] Radio frequency power amplifier is an important component of various wireless transmitters, which is used to amplify radio frequency signals. In the front-end circuit of the wireless transmitter, the power of the radio frequency signal generated by the modulation oscillator circuit is very small, and needs to pass through a series of amplification stages to obtain sufficient radio frequency power before being fed to the antenna for radiation.

[0003] Although the current radio frequency power amplifier is widely used in radio frequency circuits, it has the disadvantage of low gain. However, a radio frequency power amplifier with low gain will significantly increase the design difficulty of other circuits in the radio frequency circuit, resulting in higher design and manufacturing costs. Therefore, how to improve the gain of the radio frequency power amplifier has become a problem to be solved. SUMMARY

[0004] The technical scheme of the embodiments of the present disclosure is implemented as follows: The embodiments of the present disclosure provide a common-base radio frequency power amplifier, which comprises: an input balun, an output balun, at least one transistor and a feedback circuit; a first input end of the input balun receives a first signal; a second input end of the input balun is grounded; an emitter of the transistor is connected to a corresponding output end of the input balun; a collector of the transistor is connected to a corresponding input end of the output balun; a first output end of the output balun outputs a second signal; a second output end of the output balun is grounded; the feedback circuit is connected to a base of the transistor; the input balun, the transistor and the output balun are configured to amplify the first signal into the second signal; the feedback circuit is configured to generate a feedback signal based on the input balun and / or the output balun, and couple the feedback signal to the base of the transistor.

[0005] In some embodiments of the present disclosure, the feedback circuit comprises: at least one feedback capacitor; a first end of the feedback capacitor is connected to the base of the corresponding transistor; a second end of the feedback capacitor receives the feedback signal.

[0006] In some embodiments of the present disclosure, the feedback circuit further comprises: at least one feedback inductor; the feedback inductor is connected to the second end of the feedback capacitor; the feedback inductor is coupled to the input balun and / or the output balun.

[0007] In some embodiments of the present disclosure, the feedback inductor couples a differential inductance of the input balun and / or a differential inductance of the output balun.

[0008] In some embodiments of the present disclosure, the at least one transistor comprises: a first transistor and a second transistor; a first output terminal of the input bar is connected to an emitter of the first transistor; a first input terminal of the output bar is connected to a collector of the first transistor; a second output terminal of the input bar is connected to an emitter of the second transistor; a second input terminal of the output bar is connected to a collector of the second transistor; the feedback circuit comprises: a first feedback capacitor and a second feedback capacitor; a first end of the first feedback capacitor is connected to a base of the first transistor; a first end of the second feedback capacitor is connected to a base of the second transistor.

[0009] In some embodiments of the present disclosure, a second end of the first feedback capacitor is connected to the second input terminal of the output bar; a second end of the second feedback capacitor is connected to the first input terminal of the output bar.

[0010] In some embodiments of the present disclosure, the feedback circuit further comprises: a first feedback inductor; a second end of the first feedback capacitor and a second end of the second feedback capacitor are respectively connected to two ends of the first feedback inductor; the first feedback inductor is coupled with the input bar or the output bar.

[0011] In some embodiments of the present disclosure, the at least one transistor comprises: a third transistor; a first output terminal of the input bar is connected to an emitter of the third transistor; a first input terminal of the output bar is connected to a collector of the third transistor; the feedback circuit comprises: a third feedback capacitor and a second feedback inductor; a first end of the third feedback capacitor is connected to a base of the third transistor; a second end of the third feedback capacitor is connected to a first end of the second feedback inductor; the second feedback inductor is coupled with the input bar or the output bar; a second end of the second feedback inductor, a second output terminal of the input bar and a second input terminal of the output bar are all grounded.

[0012] In some embodiments of the present disclosure, the common-base radio frequency power amplifier further comprises: at least one current source; a base of the transistor is connected to a corresponding current source.

[0013] In some embodiments of the present disclosure, the common-base radio frequency power amplifier further comprises: a preamplifier; an output terminal of the preamplifier is connected to a first input terminal of the input bar; the preamplifier is configured to preamplify a signal received by the common-base radio frequency power amplifier and output the first signal.

[0014] It can be understood that the feedback circuit couples the signal of the transistor input or output back to the base of the transistor, so as to affect the base voltage of the transistor, so as to adjust the Vbe equivalent radio frequency swing to a suitable range, and improve the gain, power added efficiency and linearity of the amplifier. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Circuit structure schematic of a common base radio frequency power amplifier in the related art Figure 1 ; Figure 2 Circuit structure schematic of a common base radio frequency power amplifier in the related art Figure 2 ; Figure 3 Circuit structure schematic of a common base radio frequency power amplifier provided by an embodiment of the present disclosure Figure 1 ; Figure 4 Circuit structure schematic of a common base radio frequency power amplifier provided by an embodiment of the present disclosure Figure 2 ; Figure 5 Circuit structure schematic of a common base radio frequency power amplifier provided by an embodiment of the present disclosure Figure 3 ; Figure 6 Circuit structure schematic of a common base radio frequency power amplifier provided by an embodiment of the present disclosure Figure 4 ; Figure 7 Circuit structure schematic of a common base radio frequency power amplifier provided by an embodiment of the present disclosure Figure 5 ; Figure 6 Circuit structure schematic of a common base radio frequency power amplifier provided by an embodiment of the present disclosure Figure 7 ; Figure 1 Circuit structure schematic of a common base radio frequency power amplifier provided by an embodiment of the present disclosure Figure 1 . DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the present disclosure clearer, the technical scheme of the present disclosure will be further described in detail below in combination with the drawings and embodiments, and the described embodiments should not be regarded as limiting the present disclosure, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present disclosure.

[0017] In the following description, “some embodiments” are related to a subset of all possible embodiments, but it can be understood that “some embodiments” can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0018] If the application file contains similar descriptions of "first / second", the following description is added. In the following description, the terms "first / second / third" are only used to distinguish similar objects, and do not represent a specific order of the objects. Understandably, "first / second / third" can be interchanged in a specific order or sequence as allowed, so that the embodiments of the disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0019] In this document, when a layer / element is referred to as being "on" another layer / element, it can be directly on the other layer / element, or there can be intervening layers / elements between them. Also, in one orientation, a layer / element is "on" another layer / element, when reversed, the layer / element can be "under" the other layer / element.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in this document is for the purpose of describing embodiments of the disclosure only and is not intended to be limiting of the disclosure.

[0021] Figure 1 A circuit of a common-base radio frequency power amplifier in the related art is shown.

[0022] Reference Figure 1 The common-base radio frequency power amplifier includes two transformers: an input transformer TF1 and an output transformer TF2. A first input end of the input transformer TF1 receives a first signal RF1, and a first output end of the output transformer TF2 outputs a second signal RF2, wherein the first signal RF1 and the second signal RF2 are both radio frequency signals. The input transformer TF1 and the output transformer TF2 can amplify the power of the first signal RF1 through coupling and output the second signal RF2.

[0023] Continuing to refer to Figure 2 The common-base radio frequency power amplifier further includes two transistors: a first transistor Q1 and a second transistor Q2. A first output end of the input transformer TF1 is connected to an emitter of the first transistor Q1, and a first input end of the output transformer TF2 is connected to a collector of the first transistor Q1. A second output end of the input transformer TF1 is connected to an emitter of the second transistor Q2, and a second input end of the output transformer TF2 is connected to a collector of the second transistor Q2. The first transistor Q1 and the second transistor Q2 can form a push-pull structure, thereby being able to cancel even harmonics and improve output power.

[0024] Continuing to refer to Figure 2The middle part of the coil of the differential inductor of the input balun TF1 (i.e. the inductor connecting the first transistor Q1 and the second transistor Q2) is connected to the ground terminal; in addition, the middle part of the coil of the differential inductor of the output balun TF2 (i.e. the inductor connecting the first transistor Q1 and the second transistor Q2) is connected to the DC voltage source U1. Meanwhile, the second input terminal of the input balun TF1 and the second output terminal of the output balun TF2 are both grounded. In this way, a stable static working point is provided for the input balun TF1 and the output balun TF2, so that the common mode noise can be suppressed and the signal loss can be reduced.

[0025] Figure 2 Another circuit of a common-base radio frequency power amplifier in the related art is shown.

[0026] Reference Figure 2 The common-base radio frequency power amplifier includes two baluns: an input balun TF1 and an output balun TF2. The first input terminal of the input balun TF1 receives a first signal RF1, and the first output terminal of the output balun TF2 outputs a second signal RF2, wherein the first signal RF1 and the second signal RF2 are both radio frequency signals. The input balun TF1 and the output balun TF2 can amplify the power of the first signal RF1 through coupling and output the second signal RF2.

[0027] Reference Figure 1 The common-base radio frequency power amplifier further includes a transistor: a third transistor Q3. The first output terminal of the input balun TF1 is connected to the emitter of the third transistor Q3, and the first input terminal of the output balun TF2 is connected to the collector of the third transistor Q3.

[0028] Reference Figure 2 The second input terminal and the second output terminal of the input balun TF1, and the second input terminal and the second output terminal of the output balun TF2 are both grounded. In this way, a stable static working point is provided for the input balun TF1 and the output balun TF2, so that the common mode noise can be suppressed and the signal loss can be reduced.

[0029] It should be noted that, with reference to Figure 1 and Figure 2 The common-base radio frequency power amplifier is called "common-base" because the bases of the transistors Q1, Q2 and Q3 in the circuit configuration serve as the common terminal of the input and output. Among them, the input signal is connected through the emitter of the transistors Q1, Q2 and Q3, and the output signal is led out from the collector of the transistors Q1, Q2 and Q3, while the bases of the transistors Q1, Q2 and Q3 simultaneously serve as the reference point of the input loop and the output loop, forming the structure of "common base".

[0030] Based on the impedance characteristics of the transistor, the input impedance of the common base amplifier is lower, and the output impedance is higher, so it is suitable for high frequency signal amplification, and is widely used in radio frequency and microwave fields. Compared with the common emitter amplifier with a common emitter and the common collector amplifier with a common collector, the common base amplifier has unique voltage gain and frequency response advantages. Specifically, the current gain of the common base amplifier is about 1, but the voltage gain is higher, and the total power gain is determined by the voltage gain and impedance transformation, so the common base amplifier has higher total power gain; at the same time, the common base amplifier takes the base as the reference point, reduces the influence of the inter-electrode capacitance of the transistor, effectively expands the upper cut-off frequency of the amplifier, and is suitable for linear power amplification of radio frequency signals.

[0031] In Figures 3 to 9 and Figures 3 to 9 Based on the common base radio frequency power amplifier shown in the figure, the embodiment of the present disclosure provides a common base radio frequency power amplifier, as shown in the figure. Figure 3

[0032] Referring to any one of the drawings in Figure 4 In the embodiment of the present disclosure, the common base radio frequency power amplifier comprises: an input balun TF1, an output balun TF2, at least one transistor and a feedback circuit FB1 / FB2. The first input end of the input balun TF1 receives a first signal RF1, and the second input end of the input balun TF1 is grounded. The emitter of the transistor is connected to the corresponding output end of the input balun TF1, and the collector of the transistor is connected to the corresponding input end of the output balun TF2. The first output end of the output balun TF2 outputs a second signal RF2, and the second output end of the output balun TF2 is grounded. Wherein, the input balun TF1, the transistor and the output balun TF2 are configured to amplify the first signal RF1 into the second signal RF2. That is, the input balun TF1 and the output balun TF2 can amplify the power of the first signal RF1 through coupling, and output the second signal RF2.

[0033] In the embodiment of the present disclosure, the base of the transistor is connected with the feedback circuit FB1 / FB2. Wherein, the feedback circuit FB1 / FB2 is configured to generate a feedback signal based on the input balun TF1 and / or the output balun TF2, and couple the feedback signal to the base of the transistor. That is, the feedback circuit FB1 / FB2 can couple the signal input or output by the transistor back to the base of the transistor, thereby affecting the base voltage of the transistor.

[0034] ​It can be understood that the feedback circuit couples the signal of the transistor input or output back to the base of the transistor, so that the base voltage of the transistor can be affected, and thus the Vbe equivalent RF swing can be adjusted to a suitable range. The Vbe equivalent RF swing refers to the dynamic change range of the base-emitter voltage (Vbe) of the transistor under the action of the RF signal, which directly affects the linearity and efficiency of the amplifier. Therefore, the cascode RF power amplifier provided in the embodiments of the present disclosure has higher gain, better power added efficiency (PAE), and better linearity.

[0035] It should be noted that, Figure 5 、 Figure 8 、 Figure 6 and Figure 7 The feedback circuit FB2 shown in the figure is based on the output balun TF2 to generate a feedback signal, that is, feedback based on the output signal of the transistor, which can be referred to as "feedback". Correspondingly, Figure 9 、 Figures 3 to 9 and Figures 3 to 9 The feedback circuit FB1 shown in the figure is based on the input balun TF1 to generate a feedback signal, that is, feedback based on the input signal of the transistor, which can be referred to as "feedforward".

[0036] In some embodiments of the present disclosure, the feedback circuit FB1 of "feedforward" and the feedback circuit FB2 of "feedback" can be separately provided in the cascode RF power amplifier, as shown in the circuit of Figures 4 to 9 .

[0037] In some embodiments of the present disclosure, the feedback circuit FB1 of "feedforward" and the feedback circuit FB2 of "feedback" can be simultaneously provided in the cascode RF power amplifier; that is, the feedback circuit FB1 of "feedforward" and the feedback circuit FB2 of "feedback" can simultaneously act on the base of the transistor.

[0038] In some embodiments of the present disclosure, with reference to any one of the accompanying drawings in Figures 4 to 9 , the feedback circuit FB1 / FB2 comprises at least one feedback capacitor (including feedback capacitors C1, C2 or C3). The first end of the feedback capacitor is connected to the base of the corresponding transistor, and the second end of the feedback capacitor receives a feedback signal. The feedback capacitor is configured to couple the feedback signal to the base of the transistor.

[0039] It can be understood that, by using the coupling effect of the feedback capacitor on the RF signal, the feedback signal can be coupled to the base of the transistor, the base voltage of the transistor can be affected, and thus the Vbe equivalent RF swing can be adjusted to a suitable range, thereby improving the gain, power added efficiency, and linearity of the cascode RF power amplifier.

[0040] In some embodiments of the present disclosure, with reference toFigures 3 to 7 As shown in any one of the accompanying drawings, the feedback circuit FB1 / FB2 further comprises at least one feedback inductor (including the feedback inductor L1 or L2). The feedback inductor is connected to the second end of the feedback capacitor, and is coupled with the input balun and / or the output balun. The feedback inductor is configured to generate the feedback signal.

[0041] It can be understood that, by virtue of the coupling of the feedback inductor with the input / output balun, the feedback signal can be generated, and then the feedback signal can be coupled to the base of the transistor to affect the base voltage of the transistor, so that the Vbe equivalent RF swing can be adjusted to a suitable range, and the gain, power added efficiency and linearity of the common-base RF power amplifier can be improved.

[0042] In some embodiments of the present disclosure, referring to any one of the accompanying drawings, the feedback inductor L1 or L2 is coupled with the differential inductor of the input balun TF1 and / or the differential inductor of the output balun TF2. Figures 3 to 7

[0043] In the embodiments of the present disclosure, the input balun TF1 and the output balun TF2 are each formed by the mutual winding of a primary coil (i.e., a differential inductor) and a secondary coil (i.e., a single-ended inductor). The differential inductor of the input balun TF1 and the differential inductor of the output balun TF2 are directly connected to the transistor, and the signal strength on the differential inductor is consistent with the input / output signal of the transistor. Therefore, the feedback inductor L1 or L2 is coupled with the differential inductor, and the feedback signal can be generated based on the input / output signal of the transistor, so that the base voltage of the transistor can be more effectively affected, and the Vbe equivalent RF swing can be adjusted to a suitable range.

[0044] In some embodiments of the present disclosure, referring to any one of the accompanying drawings, the at least one transistor comprises a first transistor Q1 and a second transistor Q2. The first output end of the input balun TF1 is connected to the emitter of the first transistor Q1, and the first input end of the output balun TF2 is connected to the collector of the first transistor Q1. The second output end of the input balun TF1 is connected to the emitter of the second transistor Q2, and the second input end of the output balun TF2 is connected to the collector of the second transistor Q2. Figure 3 Continuing to refer to any one of the accompanying drawings, the feedback circuit FB1 / FB2 comprises a first feedback capacitor C1 and a second feedback capacitor C2. The first end of the first feedback capacitor C1 is connected to the base of the first transistor Q1, and the first end of the second feedback capacitor C2 is connected to the base of the second transistor Q2.

[0045] Figures 4 to 7 In some embodiments of the present disclosure, referring to any one of the accompanying drawings, the feedback circuit FB1 / FB2 further comprises at least one feedback inductor (including the feedback inductor L1 or L2). The feedback inductor is connected to the second end of the feedback capacitor, and is coupled with the input balun and / or the output balun. The feedback inductor is configured to generate the feedback signal.

[0046] In some embodiments of the present disclosure, referring to any one of the accompanying drawings, the feedback circuit FB1 / FB2 further comprises at least one feedback inductor (including the feedback inductor L1 or L2). The feedback inductor is connected to the second end of the feedback capacitor, and is coupled with the input balun and / or the output balun. The feedback inductor is configured to generate the feedback signal. Figure 4 ​​The second end of the first feedback capacitor C1 is connected to the second input end of the output balun TF2, and the second end of the second feedback capacitor C2 is connected to the first input end of the output balun TF2. In this way, the first feedback capacitor C1 can couple the output signal of the second transistor Q2 to the base of the first transistor Q1, and the second feedback capacitor C2 can couple the output signal of the first transistor Q1 to the base of the second transistor Q2, and the base voltage of each transistor can be adjusted based on the output signal of the symmetrical transistor, so that the circuit is more convenient.

[0047] In some embodiments of the present disclosure, referring to any one of the accompanying drawings, Figure 5 In some embodiments of the present disclosure, referring to any one of the accompanying drawings,

[0048] In some embodiments of the present disclosure, the first feedback inductor L1 is coupled to the differential inductor of the input balun TF1 or the differential inductor of the output balun TF2. Wherein, the winding direction of the first feedback inductor L1 and the differential inductor can be the same or opposite. For example, in Figure 6 , the winding direction of the first feedback inductor L1 and the differential inductor of the output balun TF2 is the same; in Figure 7 , the winding direction of the first feedback inductor L1 and the differential inductor of the output balun TF2 is opposite. In Figures 8 to 9 , the winding direction of the first feedback inductor L1 and the differential inductor of the input balun TF1 is the same; in Figures 8 to 9 , the winding direction of the first feedback inductor L1 and the differential inductor of the input balun TF1 is opposite. The same or opposite winding direction will affect the signal waveform coupled to the bases of the transistors Q1 and Q2, which can be set according to specific conditions.

[0049] In some embodiments of the present disclosure, referring to any one of the accompanying drawings, Figures 3 to 9 In some embodiments of the present disclosure, referring to any one of the accompanying drawings,

[0050] Continuing to refer to any one of the accompanying drawings, Figures 3 to 9 In some embodiments of the present disclosure, referring to any one of the accompanying drawings,

[0051] In the embodiments of the present disclosure, the second feedback inductor L2 is coupled with the input balun TF1 or the output balun TF2; wherein the second feedback inductor L2 is coupled with the differential inductor of the input balun TF1 or the differential inductor of the output balun TF2. The second end of the second feedback inductor L2, the second output end of the input balun TF1 and the second input end of the output balun TF2 are all grounded; in this way, a stable static working point is provided, so that common-mode noise can be suppressed and signal loss can be reduced.

[0052] In some embodiments of the present disclosure, referring to any one of the drawings in ​ , the common-base radio frequency power amplifier further comprises at least one current source A1, A2 or A3. The base of the transistor is connected to the corresponding current source; that is, the base of the transistor Q1 is connected to the current source A1, the base of the transistor Q2 is connected to the current source A2, and the base of the transistor Q3 is connected to the current source A3.

[0053] In the embodiments of the present disclosure, the current source provides a constant bias current (Ib) for the base of the transistor, ensuring that the transistor always works in the amplification zone; at the same time, the constant current characteristic of the current source can reduce the random noise of the base current, improving the signal-to-noise ratio of the amplifier; at the same time, the current source can control the base current, optimizing the transconductance (gm) of the transistor, thereby improving the power gain and efficiency; at the same time, the base current source cooperates with the emitter signal input, and by using the current amplification characteristic of the transistor, the small signal current input at the emitter can be converted into a large signal current output at the collector.

[0054] In some embodiments of the present disclosure, referring to any one of the drawings in ​ , the common-base radio frequency power amplifier further comprises a preamplifier Amp1. The output end of the preamplifier Amp1 is connected to the first input end of the input balun TF1. The preamplifier Amp1 is configured to preamplify the signal received by the common-base radio frequency power amplifier and output a first signal RF1.

[0055] In the embodiments of the present disclosure, the preamplifier Amp1 can preamplify and preprocess the signal received by the common-base radio frequency power amplifier, improving the gain of the common-base radio frequency power amplifier; at the same time, the preamplifier Amp1 can isolate the signal source from the balun TF1 / TF2, avoiding mutual interference.

[0056] It should be noted that, in the present document, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that processes, methods, articles, or apparatuses that comprise a list of elements are not required to only those elements, but can include other elements not expressly listed, or inherent to such processes, methods, articles, or apparatuses. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0057] The above-mentioned sequence numbers of the embodiments of the present disclosure are only for description, and do not represent advantages or disadvantages of the embodiments. The disclosed methods in the several method embodiments provided by the present disclosure can be combined arbitrarily without conflict, to obtain new method embodiments. The disclosed features in the several product embodiments provided by the present disclosure can be combined arbitrarily without conflict, to obtain new product embodiments. The disclosed features in the several method or device embodiments provided by the present disclosure can be combined arbitrarily without conflict, to obtain new method or device embodiments.

[0058] The above describes only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure.

Claims

1. A common-base radio frequency power amplifier, characterized in that, The common-base RF power amplifier includes: an input balun, an output balun, at least one transistor, and a feedback circuit; The first input terminal of the input balun receives a first signal; the second input terminal of the input balun is grounded. The emitter of the transistor is connected to one of the output terminals corresponding to the input balun; The collector of the transistor is connected to one of the input terminals corresponding to the output balun; The first output terminal of the output balun outputs a second signal; the second output terminal of the output balun is grounded. The feedback circuit is connected to the base of the transistor; The input balun, the transistor, and the output balun are configured to amplify the first signal into a second signal; The feedback circuit is configured to generate a feedback signal based on the input balun and / or the output balun, and to couple the feedback signal to the base of the transistor.

2. The common-base RF power amplifier according to claim 1, characterized in that, The feedback circuit includes: at least one feedback capacitor; The first terminal of the feedback capacitor is connected to the base of the corresponding transistor; The second terminal of the feedback capacitor receives the feedback signal.

3. The common-base RF power amplifier according to claim 2, characterized in that, The feedback circuit further includes: at least one feedback inductor; The feedback inductor is connected to the second terminal of the feedback capacitor; The feedback inductor is coupled to the input balun and / or the output balun.

4. The common-base RF power amplifier according to claim 3, characterized in that, The feedback inductor is coupled to the differential inductor of the input balun and / or the differential inductor of the output balun.

5. The common-base RF power amplifier according to claim 1, characterized in that, The at least one transistor includes: a first transistor and a second transistor; The first output terminal of the input balun is connected to the emitter of the first transistor; the first input terminal of the output balun is connected to the collector of the first transistor. The second output terminal of the input balun is connected to the emitter of the second transistor; the second input terminal of the output balun is connected to the collector of the second transistor. The feedback circuit includes: a first feedback capacitor and a second feedback capacitor; The first terminal of the first feedback capacitor is connected to the base of the first transistor; The first terminal of the second feedback capacitor is connected to the base of the second transistor.

6. The common-base RF power amplifier according to claim 5, characterized in that, The second end of the first feedback capacitor is connected to the second input terminal of the output balun; the second end of the second feedback capacitor is connected to the first input terminal of the output balun.

7. The common-base RF power amplifier according to claim 5, characterized in that, The feedback circuit further includes: a first feedback inductor; The second end of the first feedback capacitor and the second end of the second feedback capacitor are respectively connected to the two ends of the first feedback inductor; The first feedback inductor is coupled to either the input balun or the output balun.

8. The common-base RF power amplifier according to claim 1, characterized in that, The at least one transistor includes: a third transistor; The first output terminal of the input balun is connected to the emitter of the third transistor; the first input terminal of the output balun is connected to the collector of the third transistor. The feedback circuit includes: a third feedback capacitor and a second feedback inductor; The first terminal of the third feedback capacitor is connected to the base of the third transistor; the second terminal of the third feedback capacitor is connected to the first terminal of the second feedback inductor. The second feedback inductor is coupled to either the input balun or the output balun; The second terminal of the second feedback inductor, the second output terminal of the input balun, and the second input terminal of the output balun are all grounded.

9. The common-base radio frequency power amplifier according to any one of claims 1 to 8, characterized in that, The common-base radio frequency power amplifier further includes: at least one current source; The base of the transistor is connected to the corresponding current source.

10. The common-base radio frequency power amplifier according to any one of claims 1 to 8, characterized in that, The common-base RF power amplifier further includes: a preamplifier; The output of the preamplifier is connected to the first input of the input balun. The preamplifier is configured to preamplify the signal received by the common-base RF power amplifier and output the first signal.

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