Active negative feedback amplification circuit and electronic product

Abstract

Provided in the present application are an active negative feedback amplification circuit and an electronic product. The active negative feedback amplification circuit at least comprises: a signal input end, a signal output end, and a power amplifier and an active negative feedback circuit which are connected between the signal input end and the signal output end, wherein a radio-frequency signal input end of the power amplifier is connected to the signal input end, and a radio-frequency signal output end of the power amplifier is connected to the signal output end; the active negative feedback circuit is coupled between the two ends of the power amplifier, and the active negative feedback circuit couples the radio-frequency signal output end to the radio-frequency signal input end; and the active negative feedback circuit comprises a capacitor and a diode unit coupled to the capacitor. By means of the solution in the present application, a feedback gain can be adjusted on the basis of a change in the output power, thereby obtaining lower distortion and higher stability without being affected by the change in the frequency.

Description

Active negative feedback amplifier circuit and electronic product Technical Field

[0001] The present application relates to the technical field of radio frequency integrated circuits, and in particular to an active negative feedback amplifier circuit and an electronic product. Background Art

[0002] With the rapid development of communication technology, the performance of power amplifier chips is also constantly improving. Linearity, stability, efficiency, gain, etc. are all important factors affecting the performance of power amplifier chips, and are also key considerations in the chip circuit design process.

[0003] In existing circuit designs, a negative feedback amplifier circuit is commonly used to improve the linearity and stability of power amplifiers. Its circuit structure is shown in Figure 1. The negative feedback amplifier circuit primarily includes a power amplifier 101, a negative feedback circuit 102, an input port 105, and an output port 106. The input of power amplifier 101 is connected to input port 105, and the output of power amplifier 101 is connected to output port 106. Negative feedback circuit 102 includes a first capacitor 103 and a first resistor 104. The first port of first capacitor 103 is connected to input port 105, the second port of first capacitor 103 is connected to the first port of first resistor 104, and the second port of first resistor 104 is connected to output port 106. The negative feedback amplifier circuit described in the above design is a passive negative feedback amplifier circuit, which can achieve low distortion and higher stability. However, the feedback ratio required for different amplifier output powers varies. Passive negative feedback has a fixed feedback ratio, resulting in the same feedback gain for different amplifier output power states, affecting the stability of the amplifier circuit.

[0004] Therefore, it is urgent to propose a new active negative feedback amplifier circuit to solve the above problems. Summary of the Invention

[0005] In order to solve one or more of the above-mentioned technical problems existing in the prior art, an embodiment of the present application provides an active negative feedback amplifier circuit, which can improve the linearity of the power amplifier and improve the stability of the power amplifier.

[0006] In order to achieve the above objectives, the technical solutions adopted by this application to solve the technical problems are:

[0007] In a first aspect, the present application provides an active negative feedback amplifier circuit, comprising at least a signal input terminal, a signal output terminal, a power amplifier connected between the signal input terminal and the signal output terminal, and an active negative feedback circuit;

[0008] The radio frequency signal input terminal of the power amplifier is connected to the signal input terminal, and the radio frequency signal output terminal of the power amplifier is connected to the signal output terminal;

[0009] The active negative feedback circuit is coupled to both ends of the power amplifier, and the active negative feedback circuit couples the radio frequency signal output end to the radio frequency signal input end;

[0010] The active negative feedback circuit includes a capacitor and a diode unit coupled to the capacitor.

[0011] In a specific embodiment, the diode unit includes at least two anti-phase coupled diode groups.

[0012] In a specific embodiment, the diode unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first diode group and a second diode group;

[0013] The first end of the capacitor is connected to the RF signal input end, the second end of the capacitor is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the RF signal output end;

[0014] The first end of the third resistor is connected to the second end of the capacitor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the second end of the second resistor;

[0015] The first end of the first diode group is connected to the second end of the third resistor, the second end of the first diode group is connected to the second end of the first resistor and the first end of the second diode group, and the second end of the second diode group is connected to the first end of the first diode group.

[0016] In a specific embodiment, the diode unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first diode group and a second diode group;

[0017] The first end of the capacitor is connected to the RF signal output terminal, the second end of the capacitor is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the RF signal input terminal;

[0018] The first end of the third resistor is connected to the second end of the capacitor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the second end of the second resistor;

[0019] The first end of the first diode group is connected to the second end of the third resistor, the second end of the first diode group is connected to the second end of the first resistor and the first end of the second diode group, and the second end of the second diode group is connected to the first end of the first diode group.

[0020] In a specific embodiment, the resistance values ​​of the second resistor and the third resistor are equal, the resistance values ​​of the first resistor and the fourth resistor are equal, and the resistance values ​​of the first resistor and the second resistor are not equal.

[0021] In a specific embodiment, the diode group includes at least one field effect transistor.

[0022] In a specific embodiment, the gate of the field effect transistor is coupled to the source.

[0023] In a specific embodiment, the gate and drain of the field effect transistor are coupled.

[0024] In a specific embodiment, the signal input end includes a first signal input end and a second signal input end, and the signal output end includes a first signal output end and a second signal output end;

[0025] The power amplifier includes a differential power amplifier, the radio frequency signal input end includes a first radio frequency signal input end and a second radio frequency signal input end, and the radio frequency signal output end includes a first radio frequency signal output end and a second radio frequency signal output end;

[0026] The first RF signal input terminal is connected to the first signal input terminal, the second RF signal input terminal is connected to the second signal input terminal, the first RF signal output terminal is connected to the first signal output terminal, and the second RF signal output terminal is connected to the second signal output terminal;

[0027] The first end of the first active negative feedback circuit is coupled to the first RF signal output end, and the second end of the first active negative feedback circuit is coupled to the first RF signal input end; the first end of the second active negative feedback circuit is coupled to the second RF signal output end, and the second end of the second active negative feedback circuit is coupled to the second RF signal input end.

[0028] In a specific embodiment, one end of the capacitor of the first active negative feedback circuit away from the diode unit is connected to the first RF signal input end, and one end of the diode unit of the first active negative feedback circuit away from the capacitor is connected to the first RF signal output end;

[0029] One end of the capacitor of the second active negative feedback circuit away from the diode unit is connected to the second RF signal input end, and an output end of the diode unit of the second active negative feedback circuit away from the capacitor is connected to the second RF signal output end.

[0030] In a specific embodiment, the diode unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first diode group and a second diode group;

[0031] A first end of the capacitor is connected to the first RF signal input terminal or the second RF signal input terminal, a second end of the capacitor is connected to the first end of the first resistor, a second end of the first resistor is connected to the first end of the second resistor, and a second end of the second resistor is connected to the first RF signal output terminal or the second RF signal output terminal;

[0032] The first end of the third resistor is connected to the second end of the capacitor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the second end of the second resistor;

[0033] The first end of the first diode group is connected to the second end of the third resistor, the second end of the first diode group is connected to the second end of the first resistor and the first end of the second diode group, and the second end of the second diode is connected to the first end of the fourth resistor.

[0034] In a specific embodiment, one end of the capacitor of the first active negative feedback circuit away from the diode unit is connected to the first RF signal output terminal, and one end of the diode unit of the first active negative feedback circuit away from the capacitor is connected to the first signal input terminal;

[0035] One end of the capacitor of the second active negative feedback circuit away from the diode unit is connected to the second RF signal output end, and an output end of the diode unit of the second active negative feedback circuit away from the second capacitor is connected to the second signal input end.

[0036] In a specific embodiment, the diode unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first diode group and a second diode group;

[0037] A first end of the capacitor is connected to the first RF signal output terminal or the second RF signal output terminal, a second end of the capacitor is connected to the first end of the first resistor, a second end of the first resistor is connected to the first end of the second resistor, and a second end of the second resistor is connected to the first RF signal input terminal or the second RF signal input terminal;

[0038] The first end of the third resistor is connected to the second end of the capacitor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the second end of the second resistor;

[0039] The first end of the first diode group is connected to the second end of the third resistor, the second end of the first diode group is connected to the second end of the first resistor and the first end of the second diode group, and the second end of the second diode is connected to the first end of the fourth resistor.

[0040] In a specific embodiment, the resistance values ​​of the second resistor and the third resistor are equal, the resistance values ​​of the first resistor and the fourth resistor are equal, and the resistance values ​​of the first resistor and the second resistor are not equal.

[0041] In a specific embodiment, the active negative feedback circuit further includes a first resistor.

[0042] In a specific embodiment, the diode unit includes at least two anti-phase coupled diode groups.

[0043] In a specific embodiment, the diode unit includes a second resistor, a first diode group, and a second diode group;

[0044] A first end of the first resistor is connected to the RF signal input terminal, a second end of the first resistor is connected to the first end of the second resistor, a second end of the second resistor is connected to the first end of the capacitor, and a second end of the capacitor is connected to the RF signal output terminal;

[0045] The first end of the first diode group is connected to the second end of the second resistor and the second end of the second diode group. The second end of the first diode group is connected to the first end of the second resistor and the first end of the second diode group.

[0046] In a specific embodiment, the diode unit includes a second resistor, a first diode group, and a second diode group;

[0047] The first end of the capacitor is connected to the RF signal input end, the second end of the capacitor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the first resistor, and the second end of the first resistor is connected to the RF signal output end;

[0048] The first end of the first diode group is connected to the first end of the second resistor and the second end of the second diode group. The second end of the first diode group is connected to the second end of the second resistor and the first end of the second diode group.

[0049] In a specific embodiment, the resistance values ​​of the first resistor and the second resistor are not equal.

[0050] In a specific embodiment, the diode group includes at least one field effect transistor.

[0051] In a specific embodiment, the gate of the field effect transistor is coupled to the source.

[0052] In a specific embodiment, the gate and drain of the field effect transistor are coupled.

[0053] In a specific embodiment, the power amplifier includes a differential power amplifier, the radio frequency signal input end includes a first radio frequency signal input end and a second radio frequency signal input end, and the radio frequency signal output end includes a first radio frequency signal output end and a second radio frequency signal output end;

[0054] The signal input end includes a first signal input end and a second signal input end, and the signal output end includes a first signal output end and a second signal output end;

[0055] The first RF signal input terminal is connected to the first signal input terminal, the second RF signal input terminal is connected to the second signal input terminal, the first RF signal output terminal is connected to the first signal output terminal, and the second RF signal output terminal is connected to the second signal output terminal;

[0056] The active negative feedback circuit includes a first active negative feedback circuit and a second active negative feedback circuit;

[0057] The first end of the first active negative feedback circuit is coupled to the first RF signal output end, and the second end of the first active negative feedback circuit is coupled to the first RF signal input end; the first end of the second active negative feedback circuit is coupled to the second RF signal output end, and the second end of the second active negative feedback circuit is coupled to the second RF signal input end.

[0058] In a specific embodiment, the end of the first resistor of the first active negative feedback circuit away from the diode unit is connected to the first RF signal input end, and the end of the capacitor of the first active negative feedback circuit away from the diode unit is connected to the first RF signal output end;

[0059] One end of the first resistor of the second active negative feedback circuit away from the diode unit is connected to the second RF signal input end, and one end of the capacitor of the second active negative feedback circuit away from the diode unit is connected to the second RF signal output end.

[0060] In a specific embodiment, the diode unit includes a second resistor, a first diode group, and a second diode group;

[0061] A first end of the first resistor is connected to the first RF signal input terminal or the second RF signal input terminal, a second end of the first resistor is connected to the first end of the second resistor, a second end of the second resistor is connected to the first end of the capacitor, and a second end of the capacitor is connected to the first RF signal output terminal or the second RF signal output terminal;

[0062] The first end of the first diode group is connected to the second end of the first resistor and the second end of the second diode group. The second end of the first diode group is connected to the second end of the second resistor and the first end of the second diode group.

[0063] In a specific embodiment, one end of the capacitor of the first active negative feedback circuit away from the diode unit is connected to the first RF signal input end, and one end of the first resistor of the first active negative feedback circuit away from the diode unit is connected to the first RF signal output end;

[0064] One end of the capacitor of the second active negative feedback circuit away from the diode unit is connected to the second RF signal input end, and one end of the first resistor of the second active negative feedback circuit away from the diode unit is connected to the second RF signal output end.

[0065] In a specific embodiment, the diode unit includes a second resistor, a first diode group, and a second diode group;

[0066] A first end of the capacitor is connected to the first RF signal input terminal or the second RF signal input terminal, a second end of the capacitor is connected to the first end of the second resistor, a second end of the second resistor is connected to the first end of the first resistor, and a second end of the first resistor is connected to the first RF signal output terminal or the second RF signal output terminal;

[0067] The first end of the first diode group is connected to the second end of the second resistor and the second end of the second diode group. The second end of the first diode group is connected to the first end of the second resistor and the first end of the second diode group.

[0068] In a specific embodiment, the resistance values ​​of the first resistor and the second resistor are not equal.

[0069] In a second aspect, the present application also provides an electronic product comprising the active negative feedback amplifier circuit as described above.

[0070] The beneficial effects of the technical solution provided by the embodiments of the present application are:

[0071] The active negative feedback amplifier circuit provided in the embodiment of the present application includes at least a signal input terminal, a signal output terminal, and a power amplifier and an active negative feedback circuit connected between the signal input terminal and the signal output terminal; the RF signal input terminal of the power amplifier is connected to the signal input terminal, and the RF signal output terminal of the power amplifier is connected to the signal output terminal; the active negative feedback circuit is coupled to both ends of the power amplifier, and the active negative feedback circuit couples the RF signal output terminal to the RF signal input terminal; the active negative feedback circuit includes a capacitor and a diode unit coupled to the capacitor. The solution of the present application can adjust the feedback gain according to the change of the output power, thereby obtaining lower distortion and higher stability, and will not be affected by frequency changes.

[0072] Not all products in this application need to have all the above effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0074] FIG1 is a schematic structural diagram of a negative feedback amplifier circuit in the prior art;

[0075] FIG2 is a schematic structural diagram of an active negative feedback amplifier circuit provided in Example 1 of the present application;

[0076] FIG3 is a schematic structural diagram of an active negative feedback amplifier circuit provided in Example 2 of the present application;

[0077] 4 is a schematic structural diagram of an active negative feedback circuit with multi-stage field effect transistors provided in Example 3 of the present application;

[0078] 5 is a schematic structural diagram of an active negative feedback circuit having multiple cascaded diode groups provided in Example 4 of the present application;

[0079] FIG6 is a schematic structural diagram of an active negative feedback amplifier circuit provided in Example 5 of the present application;

[0080] FIG7 is a schematic structural diagram of an active negative feedback amplifier circuit provided in Example 6 of the present application;

[0081] 8-10 are data comparison diagrams of an active negative feedback amplifier circuit and a passive negative feedback amplifier circuit provided in Example 5 of the present application;

[0082] FIG11 is a schematic structural diagram of an active negative feedback amplifier circuit provided in Example 7 of the present application;

[0083] FIG12 is a schematic structural diagram of an active negative feedback amplifier circuit provided in Example 8 of the present application;

[0084] 13 is a schematic structural diagram of an active negative feedback circuit with multi-stage field effect transistors provided in Example 9 of the present application;

[0085] FIG14 is a schematic structural diagram of an active negative feedback circuit having multiple cascaded diode groups provided in Example 10 of the present application;

[0086] FIG15 is a schematic structural diagram of an active negative feedback amplifier circuit provided in Example 11 of the present application;

[0087] FIG16 is a schematic structural diagram of an active negative feedback amplifier circuit provided in Example 12 of the present application;

[0088] 17 , 18 , and 19 are data comparison diagrams of the active negative feedback amplifier circuit and the passive negative feedback amplifier circuit provided in Example 11 of the present application. DETAILED DESCRIPTION

[0089] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0090] As described in the background art, although the negative feedback amplifier circuits in the prior art can achieve low distortion and high stability, on the one hand, the feedback ratios required for different output power states of the amplifier vary. Passive negative feedback has a fixed feedback ratio, which results in the same feedback gain for different output power states of the amplifier, affecting the stability of the amplifier circuit. On the other hand, when the signal passes through the passive device, a certain amount of loss is generated, resulting in a difference between the feedback signal and the input signal, which leads to a reduction in the feedback gain, also affecting the stability of the amplifier circuit. In response to one or more of the above problems, the present application creatively proposes a novel structure of an active negative feedback amplifier circuit, which can adjust the feedback gain according to the output power of the amplifier, thereby improving the linearity and stability of the power amplifier. Compared with the existing negative feedback amplifier circuit, the active negative feedback amplifier circuit can achieve lower distortion.

[0091] The following describes the embodiments of the present application in detail with reference to the accompanying drawings. Example 1

[0092] Figure 2 is a structural diagram of the active negative feedback amplifier circuit provided in an embodiment of the present application. Referring to Figure 2, the active negative feedback amplifier circuit provided in an embodiment of the present application generally includes: a signal input terminal 210, a signal output terminal 211, a power amplifier 201 and an active negative feedback circuit 202.

[0093] During specific implementation, the RF signal input terminal 212 of the power amplifier 201 is connected to the signal input terminal 210, and the RF signal output terminal 213 of the power amplifier 201 is connected to the signal output terminal 211; the input terminal of the active negative feedback circuit 202 is connected to the RF signal output terminal 213 of the power amplifier 201, and the output terminal of the active negative feedback circuit 202 is connected to the RF signal input terminal 212 of the power amplifier 201.

[0094] Referring further to FIG. 2 , as a preferred embodiment, the active negative feedback circuit in this embodiment of the present application is primarily composed of a capacitor 203 and a diode unit coupled thereto. The end of the capacitor 203 away from the diode unit (i.e., the output end of the active negative feedback circuit 202 ) is connected to the RF signal input end 212 , while the end of the diode unit away from the capacitor 203 (i.e., the input end of the active negative feedback circuit 202 ) is connected to the RF signal output end 213 .

[0095] 2 , the diode unit includes a first resistor 204, a second resistor 205, a third resistor 206, a fourth resistor 207, and a first diode group 208 and a second diode group 209. In a specific implementation, a first end of the capacitor 203 is connected to the RF signal input terminal 212 of the power amplifier 201, a second end of the capacitor 203 is connected to the first end of the first resistor 204, a second end of the first resistor 204 is connected to the first end of the second resistor 205, a second end of the second resistor 205 is connected to the RF signal input terminal 212, a first end of the third resistor 206 is connected to the second end of the capacitor 203, a second end of the third resistor 206 is connected to the first end of the fourth resistor 207, a second end of the fourth resistor 207 is connected to the second end of the second resistor 205, a first end of the first diode group 208 is connected to the second end of the third resistor 206, a second end of the first diode group 208 is connected to the second end of the first resistor 204 and the first end of the second diode group 209, and a second end of the second diode group 209 is connected to the first end of the fourth resistor 207.

[0096] It should be noted that, in the embodiment of the present application, the first end of the first diode group 208 and the first end of the second diode group 209 are cathodes, and the second end of the first diode group 208 and the second end of the second diode group 209 are anodes.

[0097] As a preferred implementation, in the embodiment of the present application, the resistance values ​​of the second resistor 205 and the third resistor 206 are set to R A1 The resistance of the first resistor 204 and the fourth resistor 207 is R B1 , where R A1 and R B1 Not equal.

[0098] Take the active negative feedback circuit 202 as an example for explanation. Assume that the turn-on voltage of the first diode group 208 and the second diode group 209 is V on , the input voltage is V0. When the input voltage V0 is very small, the first diode group 208 and the second diode group 209 are not turned on, and the signal passes through the resistor; when V 0* abs(R A / R B -R B / R A )> V on When (abs refers to the absolute value), the first diode group 208 and the second diode group 209 are turned on. At this time, the first diode group 208 and the second diode group 209 in the active negative feedback circuit 202 are equivalent to being AC short-circuited. At this time, the AC impedance of the active negative feedback is 2*min(R A , R B )+Z Cdiode , Z Cdiode is the on-state AC resistance of the diode group (including the first diode group 208 and the second diode group 209). In summary, the novel active negative feedback amplifier circuit provided in the embodiment of the present application can provide different feedback AC impedances according to different output voltages, thereby obtaining different feedback gains in different output power states, thereby improving the stability of the power amplifier and enhancing the linearity of the power amplifier.

[0099] As a preferred implementation, in an embodiment of the present application, the diode group (including the first diode group and the second diode group) includes at least one field effect transistor, wherein the gate of the field effect transistor is coupled to the source, or the gate of the field effect transistor is coupled to the drain. Example 2

[0100] The difference from Example 1 is that, in this embodiment of the present application, the input end of the active negative feedback circuit is the end of the capacitor away from the diode unit, the output end of the active negative feedback circuit is the end of the diode unit away from the capacitor, the end of the capacitor in the active negative feedback circuit away from the diode unit is connected to the RF signal output end, and the end of the diode unit away from the capacitor is connected to the RF signal input end. The circuit structure of other parts of this embodiment of the present application is the same as that of Example 1 and will not be repeated here.

[0101] FIG3 is a schematic diagram of the structure of an active negative feedback amplifier circuit provided in an embodiment of the present application. As shown in FIG3 , as a preferred embodiment, the active negative feedback amplifier circuit provided in the embodiment of the present application generally includes: a signal input terminal 610, a signal output terminal 611, a power amplifier 601, and an active negative feedback circuit 602. The RF signal input terminal 612 of the power amplifier 601 is connected to the signal input terminal 610, and the RF signal output terminal 613 of the power amplifier 601 is connected to the signal output terminal 611; the input terminal of the active negative feedback circuit 602 (i.e., the end of the capacitor away from the diode unit) is connected to the RF signal input terminal of the power amplifier 601, and the output terminal of the active negative feedback circuit 602 (i.e., the end of the diode unit away from the capacitor) is connected to the RF signal output terminal of the power amplifier 601.

[0102] 3 , in this embodiment of the present application, the active negative feedback circuit is also composed of a capacitor 603 and a diode unit coupled thereto. The end of the capacitor 603 away from the diode unit is connected to the RF signal output terminal 613 , and the end of the diode unit away from the capacitor 603 is connected to the RF signal input terminal 612 .

[0103] 3 , the diode unit includes a first resistor 604, a second resistor 605, a third resistor 606, a fourth resistor 607, and a first diode group 608 and a second diode group 609. In a specific implementation, a first end of the capacitor 603 is connected to the RF signal output terminal 613 of the power amplifier 201, a second end of the capacitor 203 is connected to the first end of the first resistor 604, a second end of the first resistor 604 is connected to the first end of the second resistor 605, a second end of the second resistor 605 is connected to the RF signal input terminal 612, a first end of the third resistor 606 is connected to the second end of the capacitor 603, a second end of the third resistor 606 is connected to the first end of the fourth resistor 607, a second end of the fourth resistor 607 is connected to the second end of the second resistor 605, a first end of the first diode group 608 is connected to the second end of the third resistor 606, a second end of the first diode group 608 is connected to the second end of the first resistor 604 and the first end of the second diode group 609, and a second end of the second diode group 609 is connected to the first end of the fourth resistor 607.

[0104] It should be noted that, in the embodiment of the present application, the first end of the first diode group 608 and the first end of the second diode group 609 are cathodes, and the second end of the first diode group 608 and the second end of the second diode group 609 are anodes.

[0105] The actual effect of the active negative feedback amplifier circuit provided in the embodiment of the present application is the same as the actual effect of the active negative feedback amplifier circuit provided in the first embodiment. Example 3

[0106] The difference from Example 1 is that the active negative feedback circuit in the embodiment of the present application has a multi-stage field-effect transistor. The circuit structure of other parts is the same as that of Example 1 and will not be described in detail here. Referring to Figure 4, the active negative feedback circuit 401 in the embodiment of the present application has a multi-stage field-effect transistor, which is mainly composed of a capacitor 402 and a diode unit coupled thereto. The end of the capacitor 402 away from the diode unit is connected to the RF signal input terminal, and the end of the diode unit away from the capacitor 402 is connected to the RF signal output terminal.

[0107] As an illustrative, non-limiting illustration, the diode unit in the embodiment of the present application is composed of a first resistor 403, a second resistor 404, a third resistor 405, a fourth resistor 406, and a first diode unit group 407, a second diode unit group 408, a third diode unit group 409, and a fourth diode unit group 410. It will be understood that the embodiment of the present application does not specifically limit the number of diode unit groups. Without violating the inventive concept of the present application, the number of diode unit groups can also be 6, 8, 10, etc., and these are not listed here one by one.

[0108] Further referring to Figure 4, the first end of the first resistor 403 is connected to the second end of the capacitor 402, the second end of the first resistor 403 is connected to the first end of the second resistor 404, the second end of the second resistor 404 is connected to the second end of the fourth resistor 406, the third resistor 405 is connected to the first end of the first resistor 403, the second end of the third resistor 405 is connected to the first end of the fourth resistor 406, the first end of the first diode group 407 is connected to the second end of the second diode group 408 and the second end of the first resistor 403, the second end of the first diode group 407 is connected to the first end of the second diode 408, the first end of the third diode group 409, and the second end of the fourth diode 410, and the second end of the third diode group 409 is connected to the second end of the third resistor 405 and the first end of the fourth diode group 410.

[0109] It should be noted here that, in the embodiment of the present application, the first end of the first diode group 407, the first end of the second diode group 408, the first end of the third diode group 409, and the first end of the fourth diode group 410 are anodes, and the second end of the first diode group 407, the second end of the second diode group 408, the second end of the third diode group 409, and the second end of the fourth diode group 410 are cathodes.

[0110] As a preferred implementation, in the embodiment of the present application, the resistance values ​​of the second resistor 404 and the third resistor 405 are set to R A1 The resistance of the first resistor 403 and the fourth resistor 406 is R B1 , where RA1 and R B1 Not equal.

[0111] Take the active negative feedback circuit 401 of the multi-stage field effect transistor as an example for explanation. Assume that the turn-on voltage of the first diode group 408, the second diode group 409, the third diode group 409 and the fourth diode group 410 is V on , the input voltage is V0. When the input voltage V0 is very small, the first diode group 408, the second diode group 409, the third diode group 409 and the fourth diode group 410 are not turned on, and the signal passes through the resistor; when V 0* abs(R A / R B -R B / R A )> V on When (abs refers to the absolute value), the first diode group 208, the second diode group 409, the third diode group 409 and the fourth diode group 410 are turned on. At this time, the first diode group 408, the second diode group 409, the third diode group 409 and the fourth diode group 410 in the multi-stage active negative feedback circuit 401 are AC short-circuited. The AC impedance of the active negative feedback is 2*min(R A , R B )+Z Cdiode , Z Cdiode In summary, the novel active negative feedback amplifier circuit provided in the embodiment of the present application can provide different feedback AC impedances according to different output voltages, thereby obtaining different feedback gains in different output power states, thereby improving the stability of the power amplifier and enhancing the linearity of the power amplifier. Example 4

[0112] The difference from Example 1 is that the active negative feedback circuit in this embodiment of the present application has multiple cascaded diode groups. The circuit structure of other parts is the same as that of Example 1 and will not be described in detail here. Referring to Figure 5, the active negative feedback circuit 501 in this embodiment of the present application has multiple cascaded diode groups, which are mainly composed of a capacitor 502 and a diode unit coupled thereto. The end of the capacitor 502 away from the diode unit is connected to the RF signal input terminal, and the end of the diode unit away from the capacitor 502 is connected to the RF signal output terminal.

[0113] Preferably, the number of diode groups includes at least 2 groups. In the embodiment of the present application, the number of diode groups is described as 4 groups. It is understandable that the embodiment of the present application does not specifically limit the number of diode groups. Under the premise of not violating the inventive concept of the present application, the number of diode groups can also be 6 groups, 8 groups, 10 groups, etc., and they are not listed here one by one.

[0114] 5 , as a preferred embodiment, in the embodiment of the present application, the diode unit is composed of a first resistor 503, a second resistor 504, a third resistor 505, a fourth resistor 506, a fifth resistor 507, a sixth resistor 508, and a first diode group 509, a second diode group 510, a third diode group 511, and a fourth diode group 512. Preferably, the gate of the first diode group 509 is coupled to the source or the drain.

[0115] In a specific implementation, the second end of the first capacitor 502 is connected to the first end of the first resistor 503, the second end of the first resistor 503 is connected to the first end of the second resistor 504, the second end of the second resistor 504 is connected to the first end of the third resistor 505, the second end of the third resistor 505 is connected to the second end of the sixth resistor 508, the first end of the fourth resistor 506 is connected to the first end of the first resistor 503, the second end of the fourth resistor 506 is connected to the first end of the fifth resistor 507, and the second end of the fifth resistor 507 is connected to the first end of the sixth resistor 508. The first end of the first diode group 509 is connected to the second end of the second diode group 510 and the second end of the first resistor 503, the second end of the first diode group 509 is connected to the first end of the second diode group 510 and the second end of the fourth resistor 506, the first end of the third diode group 511 is connected to the second end of the fourth diode group 512 and the second end of the second resistor 504, and the second end of the third diode group 511 is connected to the first end of the fourth diode group 512 and the second end of the fifth resistor 511.

[0116] It should be noted here that, in the embodiment of the present application, the first end of the first diode group 509, the first end of the second diode group 510, the first end of the third diode group 511, and the first end of the fourth diode group 512 are anodes, and the second end of the first diode group 509, the second end of the second diode group 510, the second end of the third diode group 511, and the second end of the fourth diode group 512 are cathodes.

[0117] As a preferred implementation, in the embodiment of the present application, the resistance values ​​of the second resistor 504 and the fifth resistor 507 are set to R A1 The resistance of the first resistor 503 and the fourth resistor 506 is R B1 The resistance of the third resistor 505 and the sixth resistor 508 is R C1 , where R A1 、R B1 、R C1 Not equal.

[0118] Take the active negative feedback amplifier circuit 501 of multiple cascaded diode groups as an example for explanation. Assume that the turn-on voltage of the first diode group 509, the second diode group 510, the third diode group 511 and the fourth diode group 512 is V on , the input voltage is V0. When the input voltage V0 is very small, the first diode group 509, the second diode group 510, the third diode group 511 and the fourth diode group 512 are not turned on, and the signal passes through the resistor; when V 0* abs((R A / (R B +Rc))-((Rc+R B ) / R A ))> V on When (abs refers to the absolute value), the first diode group 509, the second diode group 510, the third diode group 511 and the fourth diode group 512 are turned on. At this time, the first diode group 509, the second diode group 510, the third diode group 511 and the fourth diode group 512 in the multi-stage active negative feedback circuit 501 are AC short-circuited. The AC impedance of the active negative feedback is 2*min(R A ,(R B +Rc))+Z Cdiode , Z Cdiode is the on-state AC resistance of the diode group.

[0119] In summary, the novel active negative feedback amplifier circuit provided in the embodiment of the present application can provide different feedback AC impedance according to different output voltages, thereby obtaining different feedback gains in different output power states, thereby improving the stability of the power amplifier and improving the linearity of the power amplifier. Example 5

[0120] The difference from Example 1 is that, in the embodiment of the present application, the power amplifier is a differential power amplifier, and correspondingly, the RF signal input end includes a first RF signal input end and a second RF signal input end, the RF signal output end includes a first RF signal output end and a second RF signal output end, the signal input end includes a first signal input end and a second signal input end, and the signal output end includes a first signal output end and a second signal output end.

[0121] 6 , as a preferred embodiment, in the embodiment of the present application, the signal input terminal includes a first signal input terminal 310 and a second signal input terminal 320, and the signal output terminal includes a first signal output terminal 311 and a second signal output terminal 321. The RF signal input terminal of the differential power amplifier 301 includes a first RF signal input terminal 322 and a second RF signal input terminal 323, and the output terminal of the differential power amplifier 301 includes a first RF signal output terminal 324 and a second RF signal output terminal 325.

[0122] In specific implementation, the first RF signal input terminal 322 of the differential power amplifier 301 is connected to the first signal input terminal 310, and the second RF signal input terminal 323 of the differential power amplifier 301 is connected to the second signal input terminal 320; the first RF signal output terminal 324 of the differential power amplifier 301 is connected to the first signal output terminal 311, and the second RF signal output terminal 325 of the differential power amplifier 301 is connected to the second signal output terminal 321.

[0123] Regarding the structure of the differential power amplifier, the active negative feedback circuit includes a first active negative feedback circuit 302 and a second active negative feedback circuit 312. Further referring to FIG6 , as a preferred embodiment, in this embodiment of the present application, a first end of the first active negative feedback circuit 302 (i.e., the input end of the first active negative feedback circuit 302) is coupled to a first RF signal output end 324, and a second end of the first active negative feedback circuit 302 (i.e., the output end of the first active negative feedback circuit 302) is coupled to a first RF signal input end 322. A first end of the second active negative feedback circuit 312 (i.e., the input end of the second active negative feedback circuit 312) is coupled to a second RF signal output end 325, and a second end of the second active negative feedback circuit 312 (i.e., the output end of the second active negative feedback circuit 312) is coupled to a second RF signal input end 323. Both the first active negative feedback circuit 302 and the second active negative feedback circuit 312 are primarily composed of a capacitor 303 and a diode unit coupled thereto. In a specific implementation, the end of the capacitor 303 of the first active negative feedback circuit 302 away from the diode unit (i.e., the output end of the first active negative feedback circuit 302) is connected to the first RF signal input end 322, and the end of the diode unit of the first active negative feedback circuit 302 away from the capacitor 303 (i.e., the input end of the first active negative feedback circuit 302) is connected to the first RF signal output end 324; the end of the capacitor 303 of the second active negative feedback circuit 312 away from the diode unit (i.e., the output end of the second active negative feedback circuit 312) is connected to the second RF signal input end 323, and the end of the diode unit of the second active negative feedback circuit 312 away from the capacitor 303 (i.e., the input end of the second active negative feedback circuit 312) is connected to the second RF signal output end 325.

[0124] 6 , the diode unit in the embodiment of the present application includes a first resistor 304, a second resistor 305, a third resistor 306, a fourth resistor 307, a first diode unit group 308, and a second diode group 309. In the first active negative feedback circuit 302, a first end of the capacitor 303 is connected to the first RF signal input terminal 322, a second end of the capacitor 303 is connected to the first end of the first resistor 304, a second end of the first resistor 304 is connected to the first end of the second resistor 305, and a second end of the second resistor 305 is connected to the first RF signal output terminal 324. A first end of the third resistor 306 is connected to the second end of the capacitor 303, a second end of the third resistor 306 is connected to the first end of the fourth resistor 307, and a second end of the fourth resistor 307 is connected to the second end of the second resistor 305. A first end of the first diode group 308 is connected to the second end of the third resistor 306, a second end of the first diode group 308 is connected to the second end of the first resistor 304 and the first end of the second diode group 309, and a second end of the second diode group 309 is connected to the first end of the fourth resistor 307.

[0125] In the second active negative feedback circuit 312, a first end of the capacitor 303 is connected to the second RF signal input terminal 323, a second end of the capacitor 303 is connected to the first end of the first resistor 304, a second end of the first resistor 304 is connected to the first end of the second resistor 305, a second end of the second resistor 305 is connected to the second RF signal output terminal 325, a first end of the third resistor 306 is connected to the second end of the capacitor 303, a second end of the third resistor 306 is connected to the first end of the fourth resistor 307, a second end of the fourth resistor 307 is connected to the second end of the second resistor 305, a first end of the first diode group 308 is connected to the second end of the third resistor 306, a second end of the first diode group 308 is connected to the second end of the first resistor 304 and the first end of the second diode group 309, and a second end of the second diode group 309 is connected to the first end of the fourth resistor 307.

[0126] It is understandable that the first active negative feedback circuit 302 and the second active negative feedback circuit 312 in the embodiment of the present application can have the same circuit structure or different circuit structures. Preferably, the first active negative feedback circuit 302 and the second active negative feedback circuit 312 have the same circuit structure.

[0127] It should be noted that, in the embodiment of the present application, the first end of the first diode group 308 and the first end of the second diode group 309 are cathodes, and the second end of the first diode group 308 and the second end of the second diode group 309 are anodes.

[0128] As a preferred implementation, in the embodiment of the present application, the resistance values ​​of the second resistor 305 and the third resistor 306 are set to RA1 The resistance of the first resistor 304 and the fourth resistor 307 is R B1 , where R A1 and R B1 Not equal.

[0129] The following description will be made by taking the first active negative feedback circuit 302 as an example. Assume that the turn-on voltage of the first diode group 308 and the second diode group 309 is V on , the input voltage is V0. When the input voltage V0 is very small, the first diode group 308 and the second diode group 309 are not turned on, and the signal passes through the resistor; when V 0* abs(R A / R B -R B / R A )> V on When (abs refers to the absolute value), the first diode group 308 and the second diode group 309 are turned on. At this time, the first diode group 308 and the second diode group 309 in the active negative feedback circuit 302 are AC short-circuited. The AC impedance of the active negative feedback is 2*min(R A , R B )+Z Cdiode , Z Cdiode In summary, the novel active negative feedback amplifier circuit provided in the embodiment of the present application can provide different feedback AC impedances according to different output voltages, thereby obtaining different feedback gains in different output power states, thereby improving the stability of the power amplifier and enhancing the linearity of the power amplifier. Example 6

[0130] The difference from Example 5 is that, in the embodiment of the present application, the end of the capacitor in the active negative feedback circuit away from the diode unit (i.e., the input end of the active negative feedback circuit) is connected to the RF signal output end, and the end of the diode unit away from the capacitor (i.e., the output end of the active negative feedback circuit) is connected to the RF signal input end.

[0131] FIG7 is a schematic diagram of the structure of an active negative feedback amplifier circuit provided in an embodiment of the present application. Referring to FIG7 , the signal input terminal includes a first signal input terminal 710 and a second signal input terminal 720, and the signal output terminal includes a first signal output terminal 711 and a second signal output terminal 721. The RF signal input terminal of the differential power amplifier 701 includes a first RF signal input terminal 722 and a second RF signal input terminal 723, and the output terminal of the differential power amplifier 701 includes a first RF signal output terminal 724 and a second RF signal output terminal 725.

[0132] In specific implementation, the first RF signal input terminal 722 of the differential power amplifier 701 is connected to the first signal input terminal 710, and the second RF signal input terminal 723 of the differential power amplifier 701 is connected to the second signal input terminal 720; the first RF signal output terminal 724 of the differential power amplifier 701 is connected to the first signal output terminal 711, and the second RF signal output terminal 725 of the differential power amplifier 701 is connected to the second signal output terminal 721.

[0133] Regarding the structure of the differential power amplifier, the active negative feedback circuit includes a first active negative feedback circuit 702 and a second active negative feedback circuit 712. Further referring to FIG7 , as a preferred embodiment, in the embodiment of the present application, the first active negative feedback circuit 702 and the second active negative feedback circuit 712 are both primarily composed of a capacitor 703 and a diode unit coupled thereto. In a specific implementation, the end of the capacitor 703 of the first active negative feedback circuit 702 away from the diode unit (i.e., the input end of the first active negative feedback circuit) is connected to the first RF signal output end 324, and the end of the diode unit of the first active negative feedback circuit 702 away from the capacitor 703 (i.e., the output end of the first active negative feedback circuit) is connected to the first RF signal input end 722; the end of the capacitor 703 of the second active negative feedback circuit 712 away from the diode unit (i.e., the input end of the second active negative feedback circuit) is connected to the second RF signal output end 725, and the end of the diode unit of the second active negative feedback circuit 712 away from the capacitor 703 (i.e., the output end of the second active negative feedback circuit) is connected to the second RF signal input end 723.

[0134] 7 , the diode unit in the embodiment of the present application includes a first resistor 704, a second resistor 705, a third resistor 706, a fourth resistor 707, a first diode unit group 708, and a second diode group 709. In the first active negative feedback circuit 702, a first end of the capacitor 703 is connected to the first RF signal output terminal 724, a second end of the capacitor 703 is connected to the first end of the first resistor 704, a second end of the first resistor 704 is connected to the first end of the second resistor 705, a second end of the second resistor 705 is connected to the first RF signal input terminal 722, a first end of the third resistor 706 is connected to the second end of the capacitor 703, a second end of the third resistor 706 is connected to the first end of the fourth resistor 707, a second end of the fourth resistor 707 is connected to the second end of the second resistor 705, a first end of the first diode group 708 is connected to the second end of the third resistor 706, a second end of the first diode group 708 is connected to the second end of the first resistor 704 and the first end of the second diode group 709, and a second end of the second diode group 709 is connected to the first end of the fourth resistor 707.

[0135] In the second active negative feedback circuit 312, a first end of the capacitor 703 is connected to the second RF signal output terminal 725, a second end of the capacitor 703 is connected to the first end of the first resistor 704, a second end of the first resistor 704 is connected to the first end of the second resistor 705, a second end of the second resistor 705 is connected to the second RF signal input terminal 723, a first end of the third resistor 706 is connected to the second end of the capacitor 703, a second end of the third resistor 706 is connected to the first end of the fourth resistor 707, a second end of the fourth resistor 707 is connected to the second end of the second resistor 705, a first end of the first diode group 708 is connected to the second end of the third resistor 706, a second end of the first diode group 708 is connected to the second end of the first resistor 704 and the first end of the second diode group 709, and a second end of the second diode group 709 is connected to the first end of the fourth resistor 707.

[0136] It should be noted that, in the embodiment of the present application, the first end of the first diode group 708 and the first end of the second diode group 709 are cathodes, and the second end of the first diode group 708 and the second end of the second diode group 709 are anodes.

[0137] It is understandable that the first active negative feedback circuit 702 and the second active negative feedback circuit 712 in the embodiment of the present application can have the same circuit structure or different circuit structures. Preferably, the first active negative feedback circuit 702 and the second active negative feedback circuit 712 have the same circuit structure.

[0138] The actual effect of the active negative feedback amplifier circuit provided in the embodiment of the present application is the same as the actual effect of the active negative feedback amplifier circuit provided in the third embodiment.

[0139] Figures 8, 9, and 10 are data comparison diagrams of the active negative feedback amplifier circuit and the passive negative feedback amplifier circuit provided in Example 5 of the present application. Referring to Figures 8 to 10, compared with the active negative feedback amplifier circuit proposed in Example 5 of the present application, the passive negative feedback amplifier circuit requires different quiescent currents under the same 1dB power compression point state. It can be seen from the figure that the quiescent current of the passive negative feedback amplifier circuit is higher than the quiescent current of the active negative feedback amplifier circuit provided in Example 5 of the present application, the gain of the passive negative feedback amplifier circuit is higher than the gain of the active negative feedback amplifier circuit provided in Example 5 of the present application and is significantly increased at high power. The third-order intermodulation value of the active negative feedback amplifier circuit provided in Example 5 of the present application is lower than the third-order intermodulation value of the passive negative feedback amplifier circuit, indicating that the active negative feedback provided in Example 5 of the present application is significantly superior to the passive negative feedback amplifier circuit in improving the linearity and stability of the amplifier. Example 7

[0140] The difference from the first embodiment is that the active negative feedback circuit in the present embodiment is different from the active negative feedback circuit provided in the first embodiment. Referring to FIG11 , the active negative feedback amplifier circuit provided in the present embodiment generally includes: a signal input terminal 808, a signal output terminal 809, a power amplifier 801, and an active negative feedback circuit 802. Specifically, the power amplifier 801 is configured to receive an input signal from the signal input terminal 808 and amplify the input signal; the active negative feedback circuit 802 is connected in parallel to both ends of the power amplifier 801 to couple the RF signal output terminal to the RF signal input terminal.

[0141] During specific implementation, the RF signal input terminal 810 of the power amplifier 801 is connected to the signal input terminal 808, and the RF signal output terminal 811 of the power amplifier 801 is connected to the signal output terminal 809; the first terminal of the active negative feedback circuit 802 (i.e., the input terminal of the active negative feedback circuit 802) is connected to the RF signal output terminal 811 of the power amplifier 801, and the second terminal of the active negative feedback circuit (i.e., the output terminal of the active negative feedback circuit 802) is connected to the RF signal input terminal 810 of the power amplifier 801.

[0142] Referring further to FIG. 11 , as a preferred embodiment, in the present embodiment, the active negative feedback circuit 802 is primarily composed of a capacitor 803, a first resistor 805, and a diode unit coupled to the capacitor 803. The end of the capacitor 803 remote from the diode unit is connected to a radio frequency signal output terminal 811, the end of the first resistor 805 remote from the diode unit is connected to a radio frequency signal input terminal 810, and the diode unit is connected between the capacitor 803 and the first resistor 805.

[0143] It is understandable that by setting the first resistor 805 in the active negative feedback circuit, when the first resistor 805 detects that the input voltage is greater than the set value, a series bridge is formed, which can reduce the impact on the output power and gain of the power amplifier and further improve the stability of the power amplifier.

[0144] 11 , the diode unit includes a second resistor 804, a first diode group 806, and a second diode group 807. In a specific implementation, a first end of the first resistor 805 is connected to a radio frequency signal input terminal 810, a second end of the first resistor 805 is connected to a first end of the second resistor 804, a second end of the second resistor 804 is connected to a first end of a capacitor 803, a second end of the capacitor 803 is connected to a radio frequency signal output terminal 811, a first end of the first diode group 806 is connected to a second end of the second resistor 804 and a second end of the second diode group 807, and a second end of the first diode group 806 is connected to a first end of the second resistor 804 and a first end of the second diode group 807.

[0145] It should be noted that, in the embodiment of the present application, the first end of the first diode group 806 and the first end of the second diode group 807 are cathodes, and the second end of the first diode group 806 and the second end of the second diode group 807 are anodes.

[0146] As a preferred implementation, in the embodiment of the present application, the resistance of the second resistor 804 is set to R A , the resistance of the first resistor 805 is R B , R A With R B Not equal.

[0147] Take the active negative feedback circuit 802 as an example for explanation. Assume that the turn-on voltage of the first diode group 806 and the second diode group 807 is V on , the input voltage is V0. When the input voltage V0 is very small, the first diode group 806 and the second diode group 807 are not turned on, and the signal passes through the resistor; when V 0* abs(R A / R B -R B / R A )> V on (abs refers to the absolute value), the first diode group 806 and the second diode group 807 are turned on. At this time, the first diode group 808 and the second diode group 807 in the active negative feedback circuit 802 are equivalent to being AC short-circuited. The AC impedance of the active negative feedback is 2*min(R A , R B )+Z Cdiode , Z Cdiode In summary, the active negative feedback amplifier circuit provided in the embodiment of the present application can provide different feedback AC impedances according to different output voltages, thereby obtaining different feedback gains in different output power states, thereby improving the stability of the power amplifier and enhancing the linearity of the power amplifier.

[0148] As a preferred implementation, in an embodiment of the present application, the diode group (including the first diode group and the second diode group) includes at least one field effect transistor, wherein the gate of the field effect transistor is coupled to the source, or the gate of the field effect transistor is coupled to the drain. Example 8

[0149] The difference from Example 7 is that in this embodiment of the present application, the end of the capacitor in the active negative feedback circuit away from the diode unit (i.e., the output end of the active negative feedback circuit) is connected to the RF signal input end, the end of the first resistor away from the diode unit (i.e., the input end of the active negative feedback circuit) is connected to the RF signal output end, and the diode unit is connected between the capacitor and the first resistor. The circuit structure of the other parts of this embodiment of the present application is the same as that of Example 1 and will not be repeated here.

[0150] FIG12 is a schematic diagram of the structure of an active negative feedback amplifier circuit provided in an embodiment of the present application. Referring to FIG12 , as a preferred embodiment, the active negative feedback amplifier circuit provided in an embodiment of the present application generally includes: a signal input terminal 908, a signal output terminal 909, a power amplifier 901, and an active negative feedback circuit 902. In specific implementations, the RF signal input terminal 910 of the power amplifier 901 is connected to the signal input terminal 908, and the RF signal output terminal 911 of the power amplifier 901 is connected to the signal output terminal 909; a first terminal of the active negative feedback circuit 902 (i.e., the input terminal of the active negative feedback circuit 902) is connected to the RF signal output terminal 911 of the power amplifier 901, and a second terminal of the active negative feedback circuit (i.e., the output terminal of the active negative feedback circuit 902) is connected to the RF signal input terminal 910 of the power amplifier 901.

[0151] Referring further to FIG. 12 , as a preferred embodiment, in the embodiment of the present application, the active negative feedback circuit 902 is primarily composed of a capacitor 903, a first resistor 905, and a diode unit coupled to the capacitor 903. The end of the capacitor 903 away from the diode unit is connected to a radio frequency signal input terminal 910, the end of the first resistor 905 away from the diode unit is connected to a radio frequency signal output terminal 911, and the diode unit is connected between the capacitor 903 and the first resistor 905.

[0152] 12 , the diode unit includes a second resistor 904, a first diode group 906, and a second diode group 907. In a specific implementation, a first end of the capacitor 903 is connected to a radio frequency signal input terminal 910, a second end of the capacitor 903 is connected to a first end of the second resistor 904, a second end of the second resistor 904 is connected to a first end of the first resistor 905, a second end of the first resistor 905 is connected to a radio frequency signal output terminal 911, a first end of the first diode group 906 is connected to a first end of the second resistor 904 and a second end of the second diode group 907, and a second end of the first diode group 906 is connected to a second end of the second resistor 904 and a first end of the second diode group 907.

[0153] It should be noted that, in the embodiment of the present application, the first end of the first diode group 906 and the first end of the second diode group 907 are cathodes, and the second end of the first diode group 906 and the second end of the second diode group 907 are anodes.

[0154] The actual effect of the active negative feedback amplifier circuit provided in the embodiment of the present application is the same as the actual effect of the active negative feedback amplifier circuit provided in Example 7. Embodiment 9

[0155] The difference from Example 7 is that the active negative feedback circuit in the embodiment of the present application has a multi-stage field effect transistor, and the circuit structure of the other parts is the same as that of Example 1, which will not be described in detail here. Referring to Figure 13, the active negative feedback circuit 1001 in the embodiment of the present application has a multi-stage field effect transistor, which is mainly composed of a capacitor 1002, a first resistor 1005, and a diode unit coupled to the capacitor 1002. The end of the capacitor 1002 away from the diode unit is connected to the RF signal input terminal, the end of the first resistor 1005 away from the diode unit is connected to the RF signal output terminal, and the diode unit is connected between the capacitor 1002 and the first resistor 1005.

[0156] As an illustrative, non-limiting description, the diode unit in the embodiment of the present application is composed of a second resistor 1003, a third resistor 1004, and a first diode group 1006, a second diode group 1007, a third diode group 1008, and a fourth diode group 1009. It will be understood that the embodiment of the present application does not specifically limit the number of diode groups. Without violating the inventive concept of the present application, the number of diode groups can also be 6, 8, 10, etc., and these are not listed here one by one.

[0157] Referring further to Figure 13, the first ends of the second resistor 1003 and the third resistor 1004 are connected to the second end of the capacitor 1002, the second end of the second resistor 1003 is connected to the second end of the third resistor 1004, the second end of the third resistor 1004 is connected to the first end of the first resistor 1005, the first end of the first diode group 1006 is connected to the second end of the second diode group 1007 and the first end of the first resistor 1003, the second end of the first diode group 1006 is connected to the first end of the second diode 1007 and the second end of the second resistor 1003, the first end of the third diode group 1008 is connected to the second end of the fourth diode group 1009 and the first end of the third resistor 1004, and the second end of the third diode group 1008 is connected to the first end of the fourth diode group 1009 and the second end of the third resistor 1004.

[0158] It should be noted here that, in the embodiment of the present application, the first end of the first diode group 1006, the first end of the second diode group 1007, the first end of the third diode group 1008, and the first end of the fourth diode group 1009 are cathodes, and the second end of the first diode group 1006, the second end of the second diode group 1007, the second end of the third diode group 1008, and the second end of the fourth diode group 1009 are anodes.

[0159] As a preferred implementation, in the embodiment of the present application, the resistance values ​​of the second resistor 1003 and the third resistor 404 are set to R A , the resistance of the first resistor 1005 is R B , where R A and R B Not equal.

[0160] Take the multi-stage field effect transistor active negative feedback amplifier circuit 1001 as an example for explanation. Assume that the turn-on voltage of the first diode group 1006, the second diode group 1007, the third diode group 1008 and the fourth diode group 1009 is V on , the input voltage is V0. When the input voltage V0 is very small, the first diode group 1006, the second diode group 1007, the third diode group 1008 and the fourth diode group 1009 are not turned on, and the signal passes through the resistor; when V 0* abs(R A / R B -R B / R A )> V on (abs refers to the absolute value), the first diode group 1006, the second diode group 1007, the third diode group 1008 and the fourth diode group 1009 are turned on. At this time, the first diode group 1006, the second diode group 1007, the third diode group 1008 and the fourth diode group 1009 in the multi-stage active negative feedback circuit 1001 are AC short-circuited. The AC impedance of the active negative feedback is 2*min(R A , R B )+Z Cdiode , Z Cdiode In summary, the active negative feedback amplifier circuit provided in the embodiment of the present application can provide different feedback AC impedances according to different output voltages, thereby obtaining different feedback gains in different output power states, thereby improving the stability of the power amplifier and enhancing the linearity of the power amplifier. Example 10

[0161] The difference from Example 7 is that the active negative feedback circuit in the embodiment of the present application has multiple cascaded diode groups, and the circuit structure of other parts is the same as that of Example 1, which will not be repeated here. Referring to Figure 14, the active negative feedback circuit 1101 in the embodiment of the present application is mainly composed of a capacitor 1102, a first resistor 1105, and a diode unit coupled to the capacitor 1102, wherein the diode unit has multiple cascaded diode groups. The end of the capacitor 1102 away from the diode unit is connected to the RF signal input terminal, the end of the first resistor 1105 away from the diode unit is connected to the RF signal output terminal, and the diode unit is connected between the capacitor 1102 and the first resistor 1105.

[0162] Preferably, the number of diode groups includes at least 2 groups. In the embodiment of the present application, the number of diode groups is described as 4 groups. It is understandable that the embodiment of the present application does not specifically limit the number of diode groups. Under the premise of not violating the inventive concept of the present application, the number of diode groups can also be 6 groups, 8 groups, 10 groups, etc., and they are not listed here one by one.

[0163] 14 , as a preferred embodiment, in the embodiment of the present application, the diode unit is composed of a second resistor 1103, a third resistor 1104, a first diode group 1106, a second diode group 1107, a third diode group 1108, and a fourth diode group 1109. Preferably, the gate of the first diode group 1106 is coupled to the source or the drain.

[0164] In specific implementation, the second end of the capacitor 1102 is connected to the first end of the second resistor 1103, the second end of the second resistor 1103 is connected to the first end of the third resistor 1104, the second end of the third resistor 1104 is connected to the first end of the first resistor 1105, the first end of the first diode group 1106 is connected to the second end of the second diode group 1107 and the first end of the second resistor 1103, the second end of the first diode group 1106 is connected to the first end of the second diode group 1107 and the second end of the second resistor 1103, the first end of the third diode group 1108 is connected to the second end of the fourth diode 1109 and the first end of the third resistor 1104, and the second end of the third diode group 1108 is connected to the first end of the fourth diode group 1109 and the second end of the third resistor 1104.

[0165] It should be noted here that, in the embodiment of the present application, the first end of the first diode group 1106, the first end of the second diode group 1107, the first end of the third diode group 1108, and the first end of the fourth diode group 1109 are cathodes, and the second end of the first diode group 1106, the second end of the second diode group 1107, the second end of the third diode group 1108, and the second end of the fourth diode group 1109 are anodes.

[0166] As a preferred implementation, in the embodiment of the present application, the resistance values ​​of the second resistor 1103 and the third resistor 1104 are set to R A , the resistance of the first resistor 1105 is R B , where R A 、R B Not equal.

[0167] Take the active negative feedback amplifier circuit 1101 of multiple cascaded diode groups as an example for explanation. Assume that the turn-on voltage of the first diode group 1106, the second diode group 1107, the third diode group 1108 and the fourth diode group 1109 is V on , the input voltage is V0. When the input voltage V0 is very small, the first diode group 1106, the second diode group 1107, the third diode group 1108 and the fourth diode group 1109 are not turned on, and the signal passes through the resistor; when V 0* abs(R A / R B -R B / R A )> V on (abs refers to the absolute value), the first diode group 1106, the second diode group 1107, the third diode group 1108 and the fourth diode group 1107 are turned on. At this time, the first diode group 1106, the second diode group 1107, the third diode group 1108 and the fourth diode group 1109 in the multi-stage active negative feedback circuit 1101 are AC short-circuited. The AC impedance of the active negative feedback is 2*min(R A ,(R B +Rc))+Z Cdiode , Z Cdiode In summary, the novel active negative feedback amplifier circuit provided in the embodiment of the present application can provide different feedback AC impedances according to different output voltages, thereby obtaining different feedback gains in different output power states, thereby improving the stability of the power amplifier and enhancing the linearity of the power amplifier. Example 11

[0168] The difference from Example 7 is that, in the embodiment of the present application, the power amplifier is a differential power amplifier, and correspondingly, the RF signal input end includes a first RF signal input end and a second RF signal input end, the RF signal output end includes a first RF signal output end and a second RF signal output end, the signal input end includes a first signal input end and a second signal input end, and the signal output end includes a first signal output end and a second signal output end.

[0169] 15 , as a preferred embodiment, in the embodiment of the present application, the signal input terminal includes a first signal input terminal 1208 and a second signal input terminal 1218, and the signal output terminal includes a first signal output terminal 1209 and a second signal output terminal 1219. The RF signal input terminal of the differential power amplifier 1201 includes a first RF signal input terminal 1220 and a second RF signal input terminal 1221, and the output terminal of the differential power amplifier 1201 includes a first RF signal output terminal 1222 and a second RF signal output terminal 1223.

[0170] During specific implementation, the first RF signal input terminal 1220 of the differential power amplifier 1201 is connected to the first signal input terminal 1208, and the second RF signal input terminal 1221 of the differential power amplifier 1201 is connected to the second signal input terminal 1218; the first RF signal output terminal 1222 of the differential power amplifier 1201 is connected to the first signal output terminal 1209, and the second RF signal output terminal 1223 of the differential power amplifier 1201 is connected to the second signal output terminal 1219.

[0171] Regarding the structure of the differential power amplifier, the active negative feedback circuit in the embodiment of the present application includes a first active negative feedback circuit 1202 and a second active negative feedback circuit 1212. It is understood that the first active negative feedback circuit 1202 and the second active negative feedback circuit 1212 in the embodiment of the present application can have the same circuit structure or different circuit structures. Preferably, the first active negative feedback circuit 1202 and the second active negative feedback circuit 1212 have the same circuit structure. The following description uses the example of the first active negative feedback circuit 302 and the second active negative feedback circuit 1212 having the same circuit structure.

[0172] As a preferred implementation, in this embodiment of the present application, a first end of the first active negative feedback circuit 1202 (i.e., the input end of the first active negative feedback circuit 1202) is coupled to a first RF signal output end 1222, and a second end of the first active negative feedback circuit 1202 (i.e., the output end of the first active negative feedback circuit 1202) is coupled to a first RF signal input end 1220. A first end of the second active negative feedback circuit 1212 (i.e., the input end of the second active negative feedback circuit 1212) is coupled to a second RF signal output end 1223, and a second end of the second active negative feedback circuit 1212 (i.e., the output end of the second active negative feedback circuit 1212) is coupled to a second RF signal input end 1221. Both the first active negative feedback circuit 1202 and the second active negative feedback circuit 1212 are primarily composed of a capacitor 1203, a first resistor 1205, and a diode unit coupled to the capacitor 1203. In a specific implementation, the end of the capacitor 1203 of the first active negative feedback circuit 1202 away from the diode unit (i.e., the input end of the first active negative feedback circuit 1202) is connected to the first RF signal output end 1222, and the end of the first resistor 1205 of the first active negative feedback circuit 1202 away from the diode unit (i.e., the output end of the first active negative feedback circuit 1202) is connected to the first RF signal input end 1220; the end of the capacitor 1203 of the second active negative feedback circuit 1212 away from the diode unit (i.e., the input end of the second active negative feedback circuit 1212) is connected to the second RF signal output end 1223, and the end of the first resistor 1205 of the second active negative feedback circuit 1212 away from the diode unit (i.e., the output end of the second active negative feedback circuit 1212) is connected to the second RF signal input end 1221.

[0173] 15 , the diode unit in the embodiment of the present application includes a second resistor 1204, a first diode group 1206, and a second diode group 1207. Specifically, in the first active negative feedback circuit 1202, a first end of the first resistor 1205 is connected to the first RF signal input terminal 1220, a second end of the first resistor 1205 is connected to the first end of the second resistor 1204, a second end of the second resistor 1204 is connected to the first end of the capacitor 1203, a second end of the capacitor 1203 is connected to the first RF signal output terminal 1222, a first end of the first diode group 1206 is connected to the second end of the second resistor 1204 and the second end of the second diode group 1207, and a second end of the first diode group 1206 is connected to the first end of the second resistor 1204 and the first end of the second diode group 1207.

[0174] In the second active negative feedback circuit 1212, a first end of the first resistor 1205 is connected to the second RF signal input terminal 1221, a second end of the first resistor 1205 is connected to the first end of the second resistor 1204, a second end of the second resistor 1204 is connected to the first end of the capacitor 1203, a second end of the capacitor 1203 is connected to the second RF signal output terminal 1223, a first end of the first diode group 1206 is connected to the second end of the second resistor 1204 and the second end of the second diode group 1207, and a second end of the first diode group 1206 is connected to the first end of the second resistor 1204 and the first end of the second diode group 1207.

[0175] It should be noted that, in the embodiment of the present application, the first end of the first diode group 1206 and the first end of the second diode group 1207 are cathodes, and the second end of the first diode group 1206 and the second end of the second diode group 1207 are anodes.

[0176] As a preferred implementation, in the embodiment of the present application, the resistance of the second resistor 1204 is set to R A , the resistance of the first resistor 1205 is R B , where R A and R B Not equal.

[0177] The following description will be made by taking the first active negative feedback circuit 1202 as an example. Assume that the turn-on voltage of the first diode group 1206 and the second diode group 1207 is V on , the input voltage is V0. When the input voltage V0 is very small, the first diode group 1206 and the second diode group 1207 are not turned on, and the signal passes through the resistor; when V 0* abs(R A / R B -R B / R A )> V on (abs refers to the absolute value), the first diode group 1206 and the second diode group 1207 are turned on. At this time, the first diode group 1206 and the second diode group 1207 in the active negative feedback circuit 1202 are equivalent to being AC short-circuited. The AC impedance of the active negative feedback is 2*min(R A , R B )+Z Cdiode , Z Cdiode In summary, the active negative feedback amplifier circuit provided in the embodiment of the present application can provide different feedback AC impedances according to different output voltages, thereby obtaining different feedback gains in different output power states, thereby improving the stability of the power amplifier and enhancing the linearity of the power amplifier. Example 12

[0178] The difference from Example 11 is that, in the embodiment of the present application, the end of the capacitor in the active negative feedback circuit away from the diode unit (i.e., the output end of the active negative feedback circuit) is connected to the RF signal input end, and the end of the first resistor away from the diode unit (i.e., the input end of the active negative feedback circuit) is connected to the RF signal output end.

[0179] 16 , as a preferred embodiment, in the embodiment of the present application, the signal input terminal includes a first signal input terminal 1308 and a second signal input terminal 1318, and the signal output terminal includes a first signal output terminal 1309 and a second signal output terminal 1319. The RF signal input terminal of the differential power amplifier 1301 includes a first RF signal input terminal 1313 and a second RF signal input terminal 1314, and the output terminal of the differential power amplifier 1301 includes a first RF signal output terminal 1315 and a second RF signal output terminal 1316.

[0180] In specific implementation, the first RF signal input terminal 1313 of the differential power amplifier 1301 is connected to the first signal input terminal 1308, and the second RF signal input terminal 1314 of the differential power amplifier 1301 is connected to the second signal input terminal 1318; the first RF signal output terminal 1315 of the differential power amplifier 1301 is connected to the first signal output terminal 1309, and the second RF signal output terminal 1316 of the differential power amplifier 1301 is connected to the second signal output terminal 1319.

[0181] Similarly, with respect to the structure of the differential power amplifier, the active negative feedback circuit in the embodiment of the present application includes a first active negative feedback circuit 1302 and a second active negative feedback circuit 1312. It is understood that the first active negative feedback circuit 1302 and the second active negative feedback circuit 1312 in the embodiment of the present application can have the same circuit structure or different circuit structures. Preferably, the first active negative feedback circuit 1302 and the second active negative feedback circuit 1312 have the same circuit structure. The following description uses the example of the first active negative feedback circuit 1302 and the second active negative feedback circuit 1312 having the same circuit structure.

[0182] As a preferred implementation, in this embodiment of the present application, a first terminal of the first active negative feedback circuit 1302 (i.e., the output terminal of the first active negative feedback circuit 1302) is coupled to a first RF signal input terminal 1313, and a second terminal of the first active negative feedback circuit 1302 (i.e., the input terminal of the first active negative feedback circuit 1302) is coupled to a first RF signal output terminal 1315. A first terminal of the second active negative feedback circuit 1312 (i.e., the output terminal of the second active negative feedback circuit 1312) is coupled to a second RF signal input terminal 1314, and a second terminal of the second active negative feedback circuit 1312 (i.e., the input terminal of the second active negative feedback circuit 1312) is coupled to a second RF signal output terminal 1316. Both the first active negative feedback circuit 1302 and the second active negative feedback circuit 1312 are primarily composed of a capacitor 1303, a first resistor 1305, and a diode unit coupled to the capacitor 1303. In a specific implementation, the end of the capacitor 1303 of the first active negative feedback circuit 1302 away from the diode unit (i.e., the output end of the first active negative feedback circuit 1302) is connected to the first RF signal input end 1313, and the end of the first resistor 1305 of the first active negative feedback circuit 1302 away from the diode unit (i.e., the input end of the first active negative feedback circuit 1302) is connected to the first RF signal output end 1315; the end of the capacitor 1303 of the second active negative feedback circuit 1312 away from the diode unit (i.e., the output end of the second active negative feedback circuit 1312) is connected to the second RF signal input end 1314, and the end of the first resistor 1305 of the second active negative feedback circuit 1312 away from the diode unit (i.e., the input end of the second active negative feedback circuit 1312) is connected to the second RF signal output end 1315.

[0183] 16 , the diode unit in the embodiment of the present application includes a second resistor 1304, a first diode group 1306, and a second diode group 1307. Specifically, in the first active negative feedback circuit 1302, a first end of the capacitor 1303 is connected to the first RF signal input terminal 1313, a second end of the capacitor 1303 is connected to the first end of the second resistor 1304, a second end of the second resistor 1304 is connected to the first end of the first resistor 1305, a second end of the first resistor 1305 is connected to the first RF signal output terminal 1315, a first end of the first diode group 1306 is connected to the first end of the second resistor 1304 and the second end of the second diode group 1307, and a second end of the first diode group 1306 is connected to the second end of the second resistor 1304 and the first end of the second diode group 1307.

[0184] In the second active negative feedback circuit 1312, the first end of the capacitor 1303 is connected to the second RF signal input terminal 1314, the second end of the capacitor 1303 is connected to the first end of the second resistor 1304, the second end of the second resistor 1304 is connected to the first end of the first resistor 1305, the second end of the first resistor 1305 is connected to the second RF signal output terminal 1316, the first end of the first diode group 1306 is connected to the first end of the second resistor 1304 and the second end of the second diode group 1307, and the second end of the first diode group 1306 is connected to the second end of the second resistor 1304 and the first end of the second diode group 1307.

[0185] It should be noted that, in the embodiment of the present application, the first end of the first diode group 1306 and the first end of the second diode group 1307 are cathodes, and the second end of the first diode group 1306 and the second end of the second diode group 1307 are anodes.

[0186] The actual effect of the active negative feedback amplifier circuit provided in the embodiment of the present application is the same as the actual effect of the active negative feedback amplifier circuit provided in the eleventh embodiment.

[0187] Figures 17, 18, and 19 are data comparison diagrams of the active negative feedback amplifier circuit and the passive negative feedback amplifier circuit provided in Example 11 of the present application. As shown in Figures 17 to 19, it can be seen from the figures that the quiescent current of the active negative feedback amplifier circuit provided in Example 11 of the present application is approximately equal to the quiescent current of the passive negative feedback amplifier circuit; the gain of the active negative feedback amplifier circuit provided in Example 11 of the present application is lower than the gain of the passive negative feedback amplifier circuit. When the output power is greater, the gain of the passive negative feedback amplifier circuit is significantly increased, while the gain of the active negative feedback amplifier circuit provided in Example 11 of the present application is significantly increased. The gain of the circuit is further compressed; in the relationship diagram between the third-order intermodulation value and the output power, when the output power is below 20dBm, the third-order intermodulation value of the active negative feedback amplifier circuit provided in Example 11 of the present application is very close to that of the passive negative feedback amplifier circuit; when the output power is greater than 20dBm, the third-order intermodulation value of the active negative feedback amplifier circuit provided in Example 11 of the present application is significantly smaller than that of the passive negative feedback amplifier circuit; this indicates that the active negative feedback amplifier circuit provided in Example 11 of the present application can achieve lower distortion and higher stability.

[0188] Corresponding to the active negative feedback amplifier circuit provided in the above embodiments, the present application also provides an electronic product, including the active negative feedback amplifier circuit described in any of the above items, wherein the relevant contents about the active negative feedback amplifier circuit can be referred to the above description and will not be repeated here.

[0189] In the description of the present application, it should be understood that the terms "vertical", "parallel", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0190] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0191] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An active negative feedback amplifier circuit, characterized in that, It includes at least a signal input terminal, a signal output terminal, a power amplifier, and an active negative feedback circuit connected between the signal input terminal and the signal output terminal; The RF signal input terminal of the power amplifier is connected to the signal input terminal, and the RF signal output terminal of the power amplifier is connected to the signal output terminal; The active negative feedback circuit is coupled across the power amplifier, and the active negative feedback circuit couples the RF signal output terminal to the RF signal input terminal; The active negative feedback circuit includes a capacitor and a diode unit coupled to the capacitor.

2. The active negative feedback amplifier circuit according to claim 1, characterized in that, The diode unit includes at least two inversely coupled diode groups.

3. The active negative feedback amplifier circuit according to claim 2, wherein The diode unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode group, and a second diode group; The first end of the capacitor is connected to the RF signal input terminal, the second end of the capacitor is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the RF signal output terminal, or, the first end of the capacitor is connected to the RF signal output terminal, the second end of the capacitor is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the RF signal input terminal; The first end of the third resistor is connected to the second end of the capacitor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the second end of the second resistor; The first end of the first diode group is connected to the second end of the third resistor, the second end of the first diode group is connected to the second end of the first resistor and the first end of the second diode group, and the second end of the second diode group is connected to the first end of the first diode group.

4. The active negative feedback amplifier circuit according to claim 3, wherein The resistance value of the second resistor is equal to that of the third resistor, the resistance value of the first resistor is equal to that of the fourth resistor, and the resistance value of the first resistor is not equal to that of the second resistor.

5. The active negative feedback amplifier circuit according to any one of claims 1 to 3, characterized in that, The diode unit includes at least one field effect transistor.

6. The active negative feedback amplifier circuit according to claim 5, wherein, The gate of the field effect transistor is coupled to the source or the gate of the field effect transistor is coupled to the drain.

7. The active negative feedback amplifier circuit according to claim 1, characterized in that, The signal input terminal includes a first signal input terminal and a second signal input terminal, and the signal output terminal includes a first signal output terminal and a second signal output terminal; The power amplifier includes a differential power amplifier, the RF signal input terminal includes a first RF signal input terminal and a second RF signal input terminal, and the RF signal output terminal includes a first RF signal output terminal and a second RF signal output terminal; The first RF signal input terminal is connected to the first signal input terminal, the second RF signal input terminal is connected to the second signal input terminal, the first RF signal output terminal is connected to the first signal output terminal, and the second RF signal output terminal is connected to the second signal output terminal; The first end of the first active negative feedback circuit is coupled to the first radio frequency signal output end, and the second end of the first active negative feedback circuit is coupled to the first radio frequency signal input end; the first end of the second active negative feedback circuit is coupled to the second radio frequency signal output end, and the second end of the second active negative feedback circuit is coupled to the second radio frequency signal input end.

8. The active negative feedback amplifier circuit according to claim 7, wherein One end of the capacitor of the first active negative feedback circuit, which is far from the diode unit, is connected to the first radio frequency signal input end, and one end of the diode unit of the first active negative feedback circuit, which is far from the capacitor, is connected to the first radio frequency signal output end; one end of the capacitor of the second active negative feedback circuit, which is far from the diode unit, is connected to the second radio frequency signal input end, and the output end of one end of the diode unit of the second active negative feedback circuit, which is far from the capacitor, is connected to the second radio frequency signal output end; Or, one end of the capacitor of the first active negative feedback circuit, which is far from the diode unit, is connected to the first radio frequency signal output end, and one end of the diode unit of the first active negative feedback circuit, which is far from the capacitor, is connected to the first signal input end; one end of the capacitor of the second active negative feedback circuit, which is far from the diode unit, is connected to the second radio frequency signal output end, and the output end of one end of the diode unit of the second active negative feedback circuit, which is far from the second capacitor, is connected to the second signal input end.

9. The active negative feedback amplifier circuit according to claim 8, wherein, The diode unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode group and a second diode group; The first end of the capacitor is connected to the first radio frequency signal input end or the second radio frequency signal input end, the second end of the capacitor is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the first radio frequency signal output end or the second radio frequency signal output end; or, the first end of the capacitor is connected to the first radio frequency signal output end or the second radio frequency signal output end, the second end of the capacitor is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the second resistor, and the second end of the second resistor is connected to the first radio frequency signal input end or the second radio frequency signal input end; The first end of the third resistor is connected to the second end of the capacitor, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the second end of the second resistor; The first end of the first diode group is connected to the second end of the third resistor, the second end of the first diode group is connected to the second end of the first resistor and the first end of the second diode group, and the second end of the second diode is connected to the first end of the fourth resistor.

10. The active negative feedback amplifier circuit according to claim 9, characterized in that, The resistance value of the second resistor is equal to that of the third resistor, the resistance value of the first resistor is equal to that of the fourth resistor, and the resistance value of the first resistor is not equal to that of the second resistor.

11. The active negative feedback amplifier circuit according to claim 1, wherein The active negative feedback circuit further includes a first resistor.

12. The active negative feedback amplifier circuit according to claim 11, characterized in that, The diode unit includes at least two diode groups that are inversely coupled.

13. The active negative feedback amplifier circuit according to claim 12, characterized in that, The diode unit includes a second resistor, a first diode group, and a second diode group; The first end of the first resistor is connected to the RF signal input terminal, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the capacitor, the second end of the capacitor is connected to the RF signal output terminal, the first end of the first diode group is connected to the second end of the second resistor and the second end of the second diode group, and the second end of the first diode group is connected to the first end of the second resistor and the first end of the second diode group; Alternatively, the first end of the capacitor is connected to the RF signal input terminal, the second end of the capacitor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first end of the first resistor, the second end of the first resistor is connected to the RF signal output terminal, the first end of the first diode group is connected to the first end of the second resistor and the second end of the second diode group, and the second end of the first diode group is connected to the second end of the second resistor and the first end of the second diode group.

14. The active negative feedback amplifier circuit according to claim 13, wherein The resistance values of the first resistor and the second resistor are not equal.

15. The active negative feedback amplifier circuit according to claim 12, characterized in that, The diode group includes at least one field effect transistor.

16. The active negative feedback amplifier circuit according to claim 15, wherein The gate of the field effect transistor is coupled to the source, or the gate of the field effect transistor is coupled to the drain.

17. The active negative feedback amplifier circuit according to claim 11, wherein The power amplifier includes a differential power amplifier, the RF signal input terminal includes a first RF signal input terminal and a second RF signal input terminal, and the RF signal output terminal includes a first RF signal output terminal and a second RF signal output terminal; The signal input terminal includes a first signal input terminal and a second signal input terminal, and the signal output terminal includes a first signal output terminal and a second signal output terminal; The first RF signal input terminal is connected to the first signal input terminal, the second RF signal input terminal is connected to the second signal input terminal, the first RF signal output terminal is connected to the first signal output terminal, and the second RF signal output terminal is connected to the second signal output terminal; The active negative feedback circuit includes a first active negative feedback circuit and a second active negative feedback circuit; The first end of the first active negative feedback circuit is coupled to the first RF signal output terminal, and the second end of the first active negative feedback circuit is coupled to the first RF signal input terminal; the first end of the second active negative feedback circuit is coupled to the second RF signal output terminal, and the second end of the second active negative feedback circuit is coupled to the second RF signal input terminal.

18. The active negative feedback amplifier circuit according to claim 17, wherein One end of the first resistor of the first active negative feedback circuit, which is far from the diode unit, is connected to the first radio frequency signal input terminal, and one end of the capacitor of the first active negative feedback circuit, which is far from the diode unit, is connected to the first radio frequency signal output terminal. One end of the first resistor of the second active negative feedback circuit, which is far from the diode unit, is connected to the second radio frequency signal input terminal, and one end of the capacitor of the second active negative feedback circuit, which is far from the diode unit, is connected to the second radio frequency signal output terminal; Alternatively, one end of the capacitor of the first active negative feedback circuit, which is far from the diode unit, is connected to the first radio frequency signal input terminal, and one end of the first resistor of the first active negative feedback circuit, which is far from the diode unit, is connected to the first radio frequency signal output terminal. One end of the capacitor of the second active negative feedback circuit, which is far from the diode unit, is connected to the second radio frequency signal input terminal, and one end of the first resistor of the second active negative feedback circuit, which is far from the diode unit, is connected to the second radio frequency signal output terminal.

19. The active negative feedback amplifier circuit according to claim 17, characterized in that, The diode unit includes a second resistor, a first diode group, and a second diode group; The first end of the first resistor is connected to the first radio frequency signal input terminal or the second radio frequency signal input terminal. The second end of the first resistor is connected to the first end of the second resistor. The second end of the second resistor is connected to the first end of the capacitor. The second end of the capacitor is connected to the first radio frequency signal output terminal or the second radio frequency signal output terminal. The first end of the first diode group is connected to the second end of the first resistor and the second end of the second diode group. The second end of the first diode group is connected to the second end of the second resistor and the first end of the second diode group; Alternatively, the first end of the capacitor is connected to the first radio frequency signal input terminal or the second radio frequency signal input terminal. The second end of the capacitor is connected to the first end of the second resistor. The second end of the second resistor is connected to the first end of the first resistor. The second end of the first resistor is connected to the first radio frequency signal output terminal or the second radio frequency signal output terminal. The first end of the first diode group is connected to the second end of the second resistor and the second end of the second diode group. The second end of the first diode group is connected to the first end of the second resistor and the first end of the second diode group.

20. The active negative feedback amplifier circuit according to claim 19, wherein The resistance values of the first resistor and the second resistor are not equal.

21. An electronic product, characterized in that, It includes the active negative feedback amplifier circuit according to any one of claims 1-20.

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