CN117478078B - Dynamic negative feedback amplifying circuit and electronic product - Google Patents

Dynamic negative feedback amplifying circuit and electronic product Download PDF

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Publication number
CN117478078B
CN117478078B CN202311825244.9A CN202311825244A CN117478078B CN 117478078 B CN117478078 B CN 117478078B CN 202311825244 A CN202311825244 A CN 202311825244A CN 117478078 B CN117478078 B CN 117478078B
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China
Prior art keywords
negative feedback
resistor
radio frequency
frequency signal
dynamic negative
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CN117478078A (en
Inventor
任思齐
陈俊
魏胜娇
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Etra Semiconductor Suzhou Co ltd
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Etra Semiconductor Suzhou Co ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)

Abstract

The application provides a dynamic negative feedback amplifying circuit and an electronic product, at least comprising a signal input end, a signal output end, a power amplifier and a dynamic negative feedback circuit, wherein the power amplifier and the dynamic negative feedback circuit are connected between the signal input end and the signal output end; the radio frequency signal input end of the power amplifier is connected to the signal input end, and the radio frequency signal output end of the power amplifier is connected to the signal output end; the dynamic negative feedback circuit is coupled at two ends of the power amplifier and couples the radio frequency signal output end to the radio frequency signal input end; the dynamic negative feedback circuit includes a capacitor, a first resistor, and at least one diode cell coupled to the capacitor. The influence that passive negative feedback amplification circuit brought has been solved to this application scheme, further improves power amplifier's stability and linearity, and compares with passive negative feedback amplification circuit, and dynamic negative feedback amplification circuit can realize lower distortion, has higher stability simultaneously.

Description

Dynamic negative feedback amplifying circuit and electronic product
Technical Field
The application relates to the technical field of radio frequency integrated circuits, in particular to a dynamic negative feedback amplifying circuit and an electronic product.
Background
The power amplifier is an important component in the radio frequency transmitter, and its main function is to amplify the transmission power of the signal, so that in order to make the signal be transmitted as distortion-free as possible, the power amplifier is required to have the characteristics of high linearity, high efficiency, high stability, and the like. In the design of a power amplifying circuit, a negative feedback circuit is usually introduced, and the negative feedback circuit is used for feeding back an output signal of the power amplifier to an input end through a feedback network, comparing a part of the output signal with the input signal, and adjusting the difference of the output signal and the input signal as a feedback signal, so that the negative feedback circuit can help to offset nonlinear distortion of the amplifier; the gain of the power amplifier can be reduced by introducing a negative feedback circuit, so that the stability of the power amplifier is improved.
As shown in fig. 1, a conventional passive negative feedback amplifying circuit mainly includes a power amplifier 101, a negative feedback circuit 102, a signal input terminal 105 and a signal output terminal 106. Wherein the input of the power amplifier 101 is connected to the signal input 105 and the output of the power amplifier 101 is connected to the signal output 106; the negative feedback circuit 102 comprises a capacitor 103 and a resistor 104, a first end of the capacitor 103 is connected to the signal input terminal 105, a second end of the capacitor 103 is connected to a first end of the resistor 104, and a second end of the resistor 104 is connected to the signal output terminal 106. The passive negative feedback amplifying circuit effectively improves the stability of the power amplifier and improves the linearity of the power amplifier; however, when the signal passes through the passive device, a certain loss is generated, so that a difference exists between the feedback signal and the input signal, and the feedback gain is reduced, thereby affecting the stability of the amplifying circuit.
Therefore, a new power amplifying circuit is needed to solve the above problems.
Disclosure of Invention
In order to solve one or more of the above technical problems in the prior art, the embodiment of the application provides a dynamic negative feedback amplifying circuit, which solves the influence caused by a passive negative feedback amplifying circuit, further improves the stability and linearity of a power amplifier, and compared with the passive negative feedback amplifying circuit, the dynamic negative feedback amplifying circuit can realize lower distortion and has higher stability.
In order to achieve the above purpose, the technical scheme adopted by the application for solving the technical problems is as follows:
in a first aspect, the present application provides a dynamic negative feedback amplifying circuit, at least including a signal input terminal, a signal output terminal, and a power amplifier and a dynamic negative feedback circuit connected between the signal input terminal and the signal output terminal;
the radio frequency signal input end of the power amplifier is connected to the signal input end, and the radio frequency signal output end of the power amplifier is connected to the signal output end;
the dynamic negative feedback circuit is coupled at two ends of the power amplifier and couples the radio frequency signal output end to the radio frequency signal input end;
The dynamic negative feedback circuit includes a capacitor, a first resistor, and at least one diode cell coupled to the capacitor.
In a specific embodiment, the diode unit comprises at least two inversely coupled diode groups.
In a specific embodiment, 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 radio frequency signal input end, 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, and the second end of the capacitor is connected to the radio frequency signal output end;
the first end of the first diode group is connected with the second end of the first resistor and the second end of the second diode group, and the second end of the first diode group is connected with the second end of the second resistor and the first end of the second diode group.
In a specific embodiment, the diode unit includes a second resistor, a first diode group, and a second diode group;
the first end of the capacitor is connected to the radio frequency 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 radio frequency signal output end;
The first end of the first diode group is connected with 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 with the first end of the second resistor and the first end of the second diode group.
In a specific embodiment, the resistance values of the first resistor and the second resistor are not equal.
In a specific embodiment, the diode group comprises at least one field effect transistor.
In a specific embodiment, the gate and source of the field effect transistor are coupled.
In a specific embodiment, the gate and drain of the field effect transistor are coupled.
In a specific embodiment, the power amplifier includes a differential power amplifier, the radio frequency signal input includes a first radio frequency signal input and a second radio frequency signal input, and the radio frequency signal output includes a first radio frequency signal output and a second radio frequency signal output;
the signal input end comprises a first signal input end and a second signal input end, and the signal output end comprises a first signal output end and a second signal output end;
the first radio frequency signal input end is connected to the first signal input end, the second radio frequency signal input end is connected to the second signal input end, the first radio frequency signal output end is connected to the first signal output end, and the second radio frequency signal output end is connected to the second signal output end;
The dynamic negative feedback circuit comprises a first dynamic negative feedback circuit and a second dynamic negative feedback circuit;
a first end of the first dynamic negative feedback circuit is coupled to the first radio frequency signal output end, and a second end of the first dynamic negative feedback circuit is coupled to the first radio frequency signal input end; the first end of the second dynamic negative feedback circuit is coupled to the second radio frequency signal output end, and the second end of the second dynamic negative feedback circuit is coupled to the second radio frequency signal input end.
In a specific embodiment, an end of the first resistor of the first dynamic negative feedback circuit, which is far away from the diode unit, is connected to the first radio frequency signal input end, and an end of the capacitor of the first dynamic negative feedback circuit, which is far away from the diode unit, is connected to the first radio frequency signal output end;
one end of the first resistor of the second dynamic negative feedback circuit, which is far away from the diode unit, is connected to the second radio frequency signal input end, and one end of the capacitor of the second dynamic negative feedback circuit, which is far away from the diode unit, is connected to the second radio frequency signal output end.
In a specific embodiment, 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 end or the second radio frequency signal input end, 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, and the second end of the capacitor is connected to the first radio frequency signal output end or the second radio frequency signal output end;
the first end of the first diode group is connected with the second end of the first resistor and the second end of the second diode group, and the second end of the first diode group is connected with the second end of the second resistor and the first end of the second diode group.
In a specific embodiment, an end of the capacitor of the first dynamic negative feedback circuit, which is far away from the diode unit, is connected to the first radio frequency signal input end, and an end of the first resistor of the first dynamic negative feedback circuit, which is far away from the diode unit, is connected to the first radio frequency signal output end;
one end of the capacitor of the second dynamic negative feedback circuit, which is far away from the diode unit, is connected to the second radio frequency signal input end, and one end of the first resistor of the second dynamic negative feedback circuit, which is far away from the diode unit, is connected to the second radio frequency signal output end.
In a specific embodiment, the diode unit includes a second 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 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 first radio frequency signal output end or the second radio frequency signal output end;
the first end of the first diode group is connected with 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 with the first end of the second resistor and the first end of the second diode group.
In a specific embodiment, the resistance values of the first resistor and the second resistor are not equal.
In a second aspect, the present application further provides an electronic product, including the dynamic negative feedback amplifying circuit as described above.
The beneficial effects that technical scheme that this application embodiment provided brought are:
the dynamic negative feedback amplifying circuit at least comprises a signal input end, a signal output end, a power amplifier and a dynamic negative feedback circuit, wherein the power amplifier and the dynamic negative feedback circuit are connected between the signal input end and the signal output end; the radio frequency signal input end of the power amplifier is connected to the signal input end, and the radio frequency signal output end of the power amplifier is connected to the signal output end; the dynamic negative feedback circuit is coupled at two ends of the power amplifier and couples the radio frequency signal output end to the radio frequency signal input end; the dynamic negative feedback circuit includes a capacitor, a first resistor, and at least one diode cell coupled to the capacitor. The scheme of the application solves the influence brought by the passive negative feedback amplifying circuit, further improves the stability and linearity of the power amplifier, and compared with the passive negative feedback amplifying circuit, the dynamic negative feedback amplifying circuit can realize lower distortion and has higher stability;
Further, a first resistor is arranged in the dynamic negative feedback circuit, when the first resistor detects that the input voltage is larger than a set value, a bridge is formed in series, the influence on the output power and the gain of the power amplifier can be reduced, and the stability of the power amplifier is further improved.
All of the products of the present application need not have all of the effects described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art passive negative feedback amplification circuit;
FIG. 2 is a schematic diagram of a dynamic negative feedback amplifying circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a dynamic negative feedback amplifying circuit according to a second embodiment of the present application;
fig. 4 is a schematic structural diagram of a dynamic negative feedback circuit with a multi-stage field effect transistor according to a third embodiment of the present application;
FIG. 5 is a schematic diagram of a dynamic negative feedback circuit with multiple cascaded diode groups according to a fourth embodiment of the present application;
fig. 6 is a schematic structural diagram of a dynamic negative feedback amplifying circuit provided in a fifth embodiment of the present application;
fig. 7 is a schematic structural diagram of a dynamic negative feedback amplifying circuit provided in a sixth embodiment of the present application;
fig. 8, 9 and 10 are data comparison diagrams of a dynamic negative feedback amplifying circuit and a passive negative feedback amplifying circuit provided in a fifth embodiment of the present application;
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
As described in the background art, the existing negative feedback amplifying circuit can effectively improve the stability of the power amplifier and the linearity of the power amplifier; however, when the signal passes through the passive device, a certain loss is generated, so that a difference exists between the feedback signal and the input signal, and the feedback gain is reduced, thereby affecting the stability of the amplifying circuit. In view of one or more of the above problems, the present application creatively proposes a dynamic negative feedback amplifying circuit, which can solve the influence of the negative feedback amplifying circuit, further improve the stability and linearity of the power amplifier, and compared with the existing negative feedback amplifying circuit, the dynamic negative feedback amplifying circuit can realize lower distortion and has higher stability.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Example 1
Fig. 2 is a schematic structural diagram of a dynamic negative feedback amplifying circuit according to an embodiment of the present application, and referring to fig. 2, the dynamic negative feedback amplifying circuit according to an embodiment of the present application generally includes: a signal input 208, a signal output 209, a power amplifier 201, and a dynamic negative feedback circuit 202. Specifically, the power amplifier 201 is configured to receive an input signal from the signal input terminal 208 and amplify it; the dynamic negative feedback circuit 202 is connected in parallel across the power amplifier 201 to couple the radio frequency signal output to the radio frequency signal input.
In particular, the RF signal input end 210 of the power amplifier 201 is connected to the signal input end 208, the RF signal output end 211 of the power amplifier 201 is connected to the signal output end 209, the first end of the dynamic negative feedback circuit 202 (i.e., the input end of the dynamic negative feedback circuit 202) is connected to the RF signal output end 211 of the power amplifier 201, and the second end of the dynamic negative feedback circuit (i.e., the output end of the dynamic negative feedback circuit 202) is connected to the RF signal input end 210 of the power amplifier 201.
Referring further to fig. 2, as a preferred embodiment, the dynamic negative feedback circuit 202 in the embodiment of the present application is mainly composed of a capacitor 203, a first resistor 205, and a diode unit coupled to the capacitor 203. One end of the capacitor 203, which is far from the diode unit, is connected to the radio frequency signal output terminal 211, one end of the first resistor 205, which is far from the diode unit, is connected to the radio frequency signal input terminal 210, and the diode unit is connected between the capacitor 203 and the first resistor 205.
With further reference to fig. 2, the diode unit includes a second resistor 204, a first diode group 206, and a second diode group 207. In particular, the first end of the first resistor 205 is connected to the rf signal input end 210, the second end of the first resistor 205 is connected to the first end of the second resistor 204, the second end of the second resistor 204 is connected to the first end of the capacitor 203, the second end of the capacitor 203 is connected to the rf signal output end 211, the first end of the first diode group 206 is connected to the second end of the second resistor 204 and the second end of the second diode group 207, and the second end of the first diode group 206 is connected to the first end of the second resistor 204 and the first end of the second diode group 207.
Here, in the embodiment of the present application, the first end of the first diode group 206 and the first end of the second diode group 207 are cathodes, and the second end of the first diode group 206 and the second end of the second diode group 207 are anodes.
In a preferred embodiment, in the embodiment of the present application, the resistance value of the second resistor 204 is set to R A The resistance of the first resistor 205 is R B ，R A And R is R B Are not equal.
Taking the dynamic negative feedback circuit 202 as an example, it is assumed that the turn-on voltages of the first diode group 206 and the second diode group 207 are V on The input voltage is V 0 When the input voltage V 0 When the voltage is small, the first diode group 206 and the second diode group 207 are not conducted, and the signal passes through the resistor; when V is 0* abs(R A / R B -R B / R A )> V on (abs refers to absolute value), the first diode group 206 and the second diode group 207 are turned on, and the dynamic negative feedback circuit 202 corresponds to the first diode group 208 and the second diode group 209 being short-circuited by ac, and the ac impedance of the dynamic negative feedback circuit is 2×min (R A ，R B )+Z Cdiode ，Z Cdiode Is the on-resistance of the diode group. In summary, the dynamic negative feedback amplifying circuit provided by the embodiment of the application can provide different feedback alternating current impedances according to different output voltages, so that different feedback gains can be obtained in different output power states, and further the stability of the power amplifier and the linearity of the power amplifier can be improved.
As a preferred implementation manner, the diode group (including the first diode group and the second diode group) includes at least one field effect transistor, where a gate and a source of the field effect transistor are coupled, or a gate and a drain of the field effect transistor are coupled.
Example two
The difference from the first embodiment is that in the embodiment of the present application, one end of the capacitor in the dynamic negative feedback circuit, which is far away from the diode unit (i.e., the output end of the dynamic negative feedback circuit), is connected to the rf signal input end, one end of the first resistor, which is far away from the diode unit (i.e., the input end of the dynamic 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 other parts in the embodiment of the present application is the same as that of the first embodiment, and is not described in detail here
Fig. 3 is a schematic structural diagram of a dynamic negative feedback amplifying circuit provided in the embodiment of the present application, and referring to fig. 3, as a preferred implementation manner, the dynamic negative feedback amplifying circuit provided in the embodiment of the present application generally includes: a signal input 608, a signal output 609, a power amplifier 601 and a dynamic negative feedback circuit 602. In particular, the RF signal input 610 of the power amplifier 601 is connected to the signal input 608, the RF signal output 611 of the power amplifier 601 is connected to the signal output 609, the first end of the dynamic negative feedback circuit 602 (i.e., the input of the dynamic negative feedback circuit 602) is connected to the RF signal output 611 of the power amplifier 601, and the second end of the dynamic negative feedback circuit (i.e., the output of the dynamic negative feedback circuit 602) is connected to the RF signal input 610 of the power amplifier 601.
Referring further to fig. 3, as a preferred embodiment, in the embodiment of the present application, the dynamic negative feedback circuit 602 is mainly composed of a capacitor 603, a first resistor 605, and a diode unit coupled with the capacitor 603. One end of the capacitor 603, which is far from the diode unit, is connected to the radio frequency signal input end 610, one end of the first resistor 605, which is far from the diode unit, is connected to the radio frequency signal output end 611, and the diode unit is connected between the capacitor 603 and the first resistor 605.
With further reference to fig. 3, the diode unit includes a second resistor 604, a first diode group 606, and a second diode group 607. In particular, the first end of the capacitor 603 is connected to the rf signal input end 610, the second end of the capacitor 603 is connected to the first end of the second resistor 604, the second end of the second resistor 604 is connected to the first end of the first resistor 605, the second end of the first resistor 605 is connected to the rf signal output end 611, the first end of the first diode group 606 is connected to the first end of the second resistor 604 and the second end of the second diode group 607, and the second end of the first diode group 606 is connected to the second end of the second resistor 604 and the first end of the second diode group 607.
Here, in the embodiment of the present application, the first end of the first diode group 606 and the first end of the second diode group 607 are cathodes, and the second end of the first diode group 606 and the second end of the second diode group 607 are anodes.
The actual effect of the dynamic negative feedback amplifying circuit provided in the embodiment of the present application is the same as that of the dynamic negative feedback amplifying circuit provided in the first embodiment.
Example III
The difference from the first embodiment is that the dynamic negative feedback circuit in the embodiment of the present application has a multi-stage field effect transistor, and the circuit structure of other parts is the same as that of the first embodiment, and is not described in detail herein. Referring to fig. 4, a dynamic 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, a first resistor 405, and a diode unit coupled with the capacitor 402. One end of the capacitor 402, which is far away from the diode unit, is connected to the radio frequency signal input terminal, one end of the first resistor 405, which is far away from the diode unit, is connected to the radio frequency signal output terminal, and the diode unit is connected between the capacitor 402 and the first resistor 405.
As an exemplary and non-limiting illustration, the diode unit in the embodiments of the present application is composed of the second resistor 403, the third resistor 404, and the first diode group 406, the second diode group 407, the third diode group 408, and the fourth diode group 409. It should be understood that the number of diode groups is not specifically limited in the embodiments of the present application, and the number of diode groups may be 6 groups, 8 groups, 10 groups, etc., which are not meant to be exhaustive herein, without departing from the inventive concept of the present application.
With further reference to fig. 4, the first ends of the second resistor 403 and the third resistor 404 are connected to the second end of the capacitor 402, the second end of the second resistor 403 is connected to the second end of the third resistor 404, the second end of the third resistor 404 is connected to the first end of the first resistor 405, the first end of the first diode group 406 is connected to the second end of the second diode group 407, the first end of the first resistor 403, the second end of the first diode group 406 is connected to the first end of the second diode group 407, the second end of the second resistor 403, the first end of the third diode group 408 is connected to the second end of the fourth diode group 409 and the first end of the third resistor 404, and the second end of the third diode group 408 is connected to the first end of the fourth diode group 409 and the second end of the third resistor 404.
In this embodiment, the first end of the first diode group 406, the first end of the second diode group 407, the first end of the third diode group 408, and the first end of the fourth diode group 409 are cathodes, and the second end of the first diode group 406, the second end of the second diode group 407, the second end of the third diode group 408, and the second end of the fourth diode group 409 are anodes.
In the embodiment of the present application, the resistance values of the second resistor 403 and the third resistor 404 are set to R A The resistance of the first resistor 405 is R B Wherein R is A And R is B Are not equal.
Dynamic with multi-stage field effect transistorsThe negative feedback amplifying circuit 401 is illustrated as an example, and the turn-on voltages of the first diode group 406, the second diode group 407, the third diode group 408, and the fourth diode group 409 are assumed to be V on The input voltage is V 0 When the input voltage V 0 When the voltage is small, the first diode group 406, the second diode group 407, the third diode group 408 and the fourth diode group 409 are not conducted, and the signal passes through the resistor; when V is 0* abs(R A / R B -R B / R A )> V on (abs refers to absolute value), the first diode group 406, the second diode group 407, the third diode group 408 and the fourth diode group 409 are turned on, and the multi-stage active negative feedback circuit 401 corresponds to the first diode group 406, the second diode group 407, the third diode group 408 and the fourth diode group 409 being short-circuited by ac, and the ac impedance of the active negative feedback is 2×min (R A ，R B )+Z Cdiode ，Z Cdiode Is the on-resistance of the diode group. In summary, the dynamic negative feedback amplifying circuit provided by the embodiment of the application can provide different feedback alternating current impedances according to different output voltages, so that different feedback gains can be obtained in different output power states, and further the stability of the power amplifier and the linearity of the power amplifier can be improved.
Example IV
The difference from the first embodiment is that the dynamic negative feedback circuit in the embodiment of the present application has a plurality of cascaded diode groups, and the circuit structure of the other parts is the same as that of the first embodiment, which is not described in detail herein. Referring to fig. 5, in the embodiment of the present application, a dynamic negative feedback circuit 501 is mainly composed of a first resistor 505 of a capacitor 502 and a diode unit coupled with the capacitor 502, where the diode unit has a plurality of cascaded diode groups. One end of the capacitor 502, which is far away from the diode unit, is connected to the radio frequency signal input end, one end of the first resistor 505, which is far away from the diode unit, is connected to the radio frequency signal output end, and the diode unit is connected between the capacitor 502 and the first resistor 505.
Preferably, the number of diode groups comprises at least 2 groups. In the embodiment of the present application, the number of diode groups is described as 4 groups, and it is understood that the number of diode groups is not specifically limited in the embodiment of the present application, and the number of diode groups may also be 6 groups, 8 groups, 10 groups, etc., without departing from the inventive concept of the present application, which is not meant to be exhaustive.
Referring further to fig. 5, in the present embodiment, the diode unit is composed of a second resistor 503, a third resistor 504, a first diode group 506, a second diode group 507, a third diode group 508, and a fourth diode group 509. Preferably, the gate of the first diode group 506 is coupled to the source or to the drain.
In particular, the second end of the capacitor 502 is connected to the first end of the second resistor 503, the second end of the second resistor 503 is connected to the first end of the third resistor 504, the second end of the third resistor 504 is connected to the first end of the first resistor 505, the first end of the first diode group 506 is connected to the second end of the second diode group 507 and the first end of the second resistor 503, the second end of the first diode group 506 is connected to the first end of the second diode group 507 and the second end of the second resistor 503, the first end of the third diode group 508 is connected to the second end of the fourth diode 509 and the first end of the third resistor 504, and the second end of the third diode group 508 is connected to the first end of the fourth diode group 509 and the second end of the third resistor 504.
In this embodiment, the first end of the first diode group 506, the first end of the second diode group 507, the first end of the third diode group 508, and the first end of the fourth diode group 509 are cathodes, and the second end of the first diode group 506, the second end of the second diode group 507, the second end of the third diode group 508, and the second end of the fourth diode group 509 are anodes.
In a preferred embodiment, in the embodiment of the present application, the resistance values of the second resistor 503 and the third resistor 504 are set to R A The resistance of the first resistor 505 is R B Wherein R is A 、R B Are not equal.
Dynamic negative feedback amplification with multiple cascaded diode groupsThe large circuit 501 is illustrated by way of example, assuming that the turn-on voltages of the first diode group 506, the second diode group 507, the third diode group 508, and the fourth diode group 509 are V on The input voltage is V 0 When the input voltage V 0 When the voltage is small, the first diode group 506, the second diode group 507, the third diode group 508 and the fourth diode group 509 are not conducted, and signals pass through the resistors; when V is 0* abs(R A / R B -R B / R A )> V on (abs means absolute value), the first diode group 506, the second diode group 507, the third diode group 508 and the fourth diode group 507 are turned on, and the multistage dynamic negative feedback circuit 501 corresponds to the first diode group 506, the second diode group 507, the third diode group 508 and the fourth diode group 509 being short-circuited by ac, and the dynamic negative feedback has an ac impedance of 2×min (R A ，(R B +Rc))+Z Cdiode ，Z Cdiode Is the on-resistance of the diode group. In summary, the novel dynamic negative feedback amplifying circuit provided by the embodiment of the application can provide different feedback alternating current impedances according to different output voltages, so that different feedback gains can be obtained in different output power states, and further the stability of the power amplifier can be improved and the linearity of the power amplifier can be improved.
Example five
The difference from the first embodiment is that in the embodiment of the present application, the power amplifier is a differential power amplifier, and the radio frequency signal input end includes a first radio frequency signal input end and a second radio frequency signal input end, the radio frequency signal output end includes a first radio frequency output end and a second radio frequency 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.
Referring to fig. 6, in a preferred embodiment, the signal input terminal includes a first signal input terminal 308 and a second signal input terminal 318, and the signal output terminal includes a first signal output terminal 309 and a second signal output terminal 319. The radio frequency signal input of the differential power amplifier 301 comprises a first radio frequency signal input 320 and a second radio frequency signal input 321, and the output of the differential power amplifier 301 comprises a first radio frequency signal output 322 and a second radio frequency signal output 323.
In particular, the first rf signal input 320 of the differential power amplifier 301 is connected to the first signal input 308, and the second rf signal input 321 of the differential power amplifier 301 is connected to the second signal input 318; the first radio frequency signal output 322 of the differential power amplifier 301 is connected to the first signal output 309 and the second radio frequency signal output 323 of the differential power amplifier 301 is connected to the second signal output 319.
For the structure of the differential power amplifier, the dynamic negative feedback circuit in the embodiment of the present application includes a first dynamic negative feedback circuit 302 and a second dynamic negative feedback circuit 312. It is understood that the first dynamic negative feedback circuit 302 and the second dynamic negative feedback circuit 312 in the embodiments of the present application may have the same circuit structure or may have different circuit structures. Preferably, the first dynamic negative feedback circuit 302 and the second dynamic negative feedback circuit 312 are the same circuit structure. The following description will take the same circuit configuration as the first dynamic negative feedback circuit 302 and the second dynamic negative feedback circuit 312 as an example.
As a preferred embodiment, in the embodiment of the present application, a first end of the first dynamic negative feedback circuit 302 (i.e., an input end of the first dynamic negative feedback circuit 302) is coupled to the first rf signal output end 322, and a second end of the first dynamic negative feedback circuit 302 (i.e., an output end of the first dynamic negative feedback circuit 302) is coupled to the first rf signal input end 320; a first end of the second dynamic negative feedback circuit 312 (i.e., an input of the second dynamic negative feedback circuit 312) is coupled to a second radio frequency signal output 323, and a second end of the second dynamic negative feedback circuit 312 (i.e., an output of the second dynamic negative feedback circuit 312) is coupled to the second radio frequency signal input 321. The first dynamic negative feedback circuit 302 and the second dynamic negative feedback circuit 312 are each mainly composed of a capacitor 303, a first resistor 305, and a diode unit coupled with the capacitor 303. In particular, the end of the capacitor 303 of the first dynamic negative feedback circuit 302 away from the diode unit (i.e., the input end of the first dynamic negative feedback circuit 302) is connected to the first rf signal output end 322, and the end of the first resistor 305 of the first dynamic negative feedback circuit 302 away from the diode unit (i.e., the output end of the first dynamic negative feedback circuit 302) is connected to the first rf signal input end 320; the end of the capacitor 303 of the second dynamic negative feedback circuit 312 remote from the diode unit (i.e. the input end of the second dynamic negative feedback circuit 312) is connected to the second rf signal output end 323, and the end of the first resistor 305 of the second dynamic negative feedback circuit 312 remote from the diode unit (i.e. the output end of the second dynamic negative feedback circuit 312) is connected to the second rf signal input end 321.
Referring further to fig. 6, the diode unit in the embodiment of the present application includes a second resistor 304, a first diode group 306, and a second diode group 307. In particular, in the first dynamic negative feedback circuit 302, a first end of the first resistor 305 is connected to the first rf signal input end 320, a second end of the first resistor 305 is connected to a first end of the second resistor 304, a second end of the second resistor 304 is connected to a first end of the capacitor 303, a second end of the capacitor 303 is connected to the first rf signal output end 322, a first end of the first diode group 306 is connected to a second end of the second resistor 304 and a second end of the second diode group 307, and a second end of the first diode group 306 is connected to a first end of the second resistor 304 and a first end of the second diode group 307.
In the second dynamic negative feedback circuit 312, a first end of the first resistor 305 is connected to the second rf signal input end 321, a second end of the first resistor 305 is connected to a first end of the second resistor 304, a second end of the second resistor 304 is connected to a first end of the capacitor 303, a second end of the capacitor 303 is connected to the second rf signal output end 323, a first end of the first diode group 306 is connected to a second end of the second resistor 304 and a second end of the second diode group 307, and a second end of the first diode group 306 is connected to a first end of the second resistor 304 and a first end of the second diode group 307.
Here, in the embodiment of the present application, the first end of the first diode group 306 and the first end of the second diode group 307 are cathodes, and the second end of the first diode group 306 and the second end of the second diode group 307 are anodes.
In a preferred embodiment, in the embodiment of the present application, the resistance value of the second resistor 304 is set to R A The resistance of the first resistor 305 is R B Wherein R is A And R is B Are not equal.
The first dynamic negative feedback circuit 302 is described as an example, assuming that the turn-on voltages of the first diode group 306 and the second diode group 307 are V on The input voltage is V 0 When the input voltage V 0 When the voltage is small, the first diode group 306 and the second diode group 307 are not conducted, and the signal resistance passes through; when V is 0* abs(R A / R B -R B / R A )> V on (abs refers to absolute value), the first diode group 306 and the second diode group 307 are turned on, and the dynamic negative feedback circuit 302 corresponds to the first diode group 306 and the second diode group 307 being shorted by ac, and the ac impedance of the dynamic negative feedback circuit is 2×min (R A ，R B )+Z Cdiode ，Z Cdiode Is the on-resistance of the diode group. In summary, the dynamic negative feedback amplifying circuit provided by the embodiment of the application can provide different feedback alternating current impedances according to different output voltages, so that different feedback gains can be obtained in different output power states, and further the stability of the power amplifier and the linearity of the power amplifier can be improved.
Example six
The difference from the fifth embodiment is that, in the embodiment of the present application, one end of the capacitor in the dynamic negative feedback circuit, which is far away from the diode unit (i.e., the output end of the dynamic negative feedback circuit), is connected to the rf signal input end, and one end of the first resistor, which is far away from the diode unit (i.e., the input end of the dynamic negative feedback circuit), is connected to the rf signal output end.
Referring to fig. 7, in a preferred embodiment, the signal input terminal includes a first signal input terminal 708 and a second signal input terminal 718, and the signal output terminal includes a first signal output terminal 709 and a second signal output terminal 719. The radio frequency signal input of the differential power amplifier 701 comprises a first radio frequency signal input 713 and a second radio frequency signal input 714, and the output of the differential power amplifier 701 comprises a first radio frequency signal output 715 and a second radio frequency signal output 716.
In particular, a first rf signal input 713 of the differential power amplifier 701 is connected to the first signal input 708, and a second rf signal input 714 of the differential power amplifier 701 is connected to the second signal input 718; the first radio frequency signal output 715 of the differential power amplifier 701 is connected to the first signal output 709, and the second radio frequency signal output 716 of the differential power amplifier 701 is connected to the second signal output 719.
Likewise, for the structure of the differential power amplifier, the dynamic negative feedback circuit in the embodiment of the present application includes a first dynamic negative feedback circuit 702 and a second dynamic negative feedback circuit 712. It is understood that the first dynamic negative feedback circuit 702 and the second dynamic negative feedback circuit 712 in the embodiments of the present application may have the same circuit structure or may have different circuit structures. Preferably, the first dynamic negative feedback circuit 702 and the second dynamic negative feedback circuit 712 are the same circuit structure. The following description will take the same circuit configuration as the first dynamic negative feedback circuit 702 and the second dynamic negative feedback circuit 712 as an example.
As a preferred implementation, in the embodiment of the present application, a first end of the first dynamic negative feedback circuit 702 (i.e., an output end of the first dynamic negative feedback circuit 702) is coupled to the first rf signal input end 713, and a second end of the first dynamic negative feedback circuit 702 (i.e., an input end of the first dynamic negative feedback circuit 702) is coupled to the first rf signal output end 715; a first end of the second dynamic negative feedback circuit 712 (i.e., an output of the second dynamic negative feedback circuit 712) is coupled to a second radio frequency signal input 714, and a second end of the second dynamic negative feedback circuit 712 (i.e., an input of the second dynamic negative feedback circuit 712) is coupled to a second radio frequency signal output 716. The first dynamic negative feedback circuit 702 and the second dynamic negative feedback circuit 712 are each mainly composed of a capacitor 703, a first resistor 705, and a diode unit coupled to the capacitor 703. In particular, one end of the capacitor 303 of the first dynamic negative feedback circuit 702 away from the diode unit (i.e., the output end of the first dynamic negative feedback circuit 702) is connected to the first rf signal input end 713, and one end of the first resistor 705 of the first dynamic negative feedback circuit 702 away from the diode unit (i.e., the input end of the first dynamic negative feedback circuit 702) is connected to the first rf signal output end 715; the end of the capacitor 703 of the second dynamic negative feedback circuit 712 remote from the diode unit (i.e. the output of the second dynamic negative feedback circuit 712) is connected to the second rf signal input 714, and the end of the first resistor 705 of the second dynamic negative feedback circuit 712 remote from the diode unit (i.e. the input of the second dynamic negative feedback circuit 712) is connected to the second rf signal output 715.
With further reference to fig. 7, the diode unit in the embodiment of the present application includes a second resistor 704, a first diode group 706, and a second diode group 707. In particular, in the first dynamic negative feedback circuit 702, a first end of the capacitor 703 is connected to the first rf signal input end 713, a second end of the capacitor 703 is connected to a first end of the second resistor 704, a second end of the second resistor 704 is connected to a first end of the first resistor 705, a second end of the first resistor 705 is connected to the first rf signal output end 715, a first end of the first diode group 706 is connected to a first end of the second resistor 704 and a second end of the second diode group 707, and a second end of the first diode group 706 is connected to a second end of the second resistor 704 and a first end of the second diode group 707.
In the second dynamic negative feedback circuit 712, a first terminal of the capacitor 703 is connected to the second rf signal input terminal 714, a second terminal of the capacitor 703 is connected to a first terminal of the second resistor 704, a second terminal of the second resistor 704 is connected to a first terminal of the first resistor 705, a second terminal of the first resistor 705 is connected to the second rf signal output terminal 716, a first terminal of the first diode group 706 is connected to a first terminal of the second resistor 704 and a second terminal of the second diode group 707, and a second terminal of the first diode group 706 is connected to a second terminal of the second resistor 704 and a first terminal of the second diode group 707.
In this embodiment, the first end of the first diode group 706 and the first end of the second diode group 707 are cathodes, and the second end of the first diode group 706 and the second end of the second diode group 707 are anodes.
The actual effect of the dynamic negative feedback amplifying circuit provided by the embodiment of the application is the same as that of the dynamic negative feedback amplifying circuit provided by the fifth embodiment.
Fig. 8, 9 and 10 are data comparison diagrams of the dynamic negative feedback amplifying circuit provided in the fifth embodiment of the present application and the passive negative feedback amplifying circuit, and referring to fig. 8 to 10, it can be seen that the static current of the dynamic negative feedback amplifying circuit provided in the fifth embodiment of the present application is approximately equal to the static current of the passive negative feedback amplifying circuit; the gain of the dynamic negative feedback amplifying circuit provided in the fifth embodiment of the present application is lower than that of the passive negative feedback amplifying circuit, when the output power is larger, the gain of the passive negative feedback amplifying circuit is obviously raised, and the gain of the dynamic negative feedback amplifying circuit provided in the fifth embodiment of the present application is further compressed; in the relation 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 dynamic negative feedback amplifying circuit provided by the fifth embodiment of the application has a small phase difference from the third-order intermodulation value of the passive negative feedback amplifying circuit, and when the output power is greater than 20dBm, the third-order intermodulation value of the dynamic negative feedback amplifying circuit provided by the fifth embodiment of the application is obviously smaller than the third-order intermodulation value of the passive negative feedback amplifying circuit; the fifth embodiment of the application provides a dynamic negative feedback amplifying circuit which can realize lower distortion and has higher stability.
The present application further provides an electronic product, including any one of the above-mentioned dynamic negative feedback amplifying circuits, wherein the relevant content of the dynamic negative feedback amplifying circuit may be referred to the foregoing, and is not described in detail herein.
In the description of the present application, it should be understood that the terms "vertical," "parallel," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The foregoing description of the preferred embodiments of the present application is not intended to limit the invention to the particular embodiments of the present application, but to limit the scope of the invention to the particular embodiments of the present application.

Claims (14)

1. The dynamic negative feedback amplifying circuit is characterized by at least comprising a signal input end, a signal output end, a power amplifier and a dynamic negative feedback circuit, wherein the power amplifier and the dynamic negative feedback circuit are connected between the signal input end and the signal output end;
the radio frequency signal input end of the power amplifier is connected to the signal input end, and the radio frequency signal output end of the power amplifier is connected to the signal output end;
The dynamic negative feedback circuit is coupled at two ends of the power amplifier and couples the radio frequency signal output end to the radio frequency signal input end;
the dynamic negative feedback circuit comprises a capacitor, a first resistor and at least one diode unit which are connected in series;
the diode unit comprises at least two diode groups connected in parallel and a second resistor.
2. The dynamic negative feedback amplification circuit of claim 1, wherein the diode group comprises a first diode group and a second diode group;
the first end of the first resistor is connected to the radio frequency signal input end, 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, and the second end of the capacitor is connected to the radio frequency signal output end;
the first end of the first diode group is connected with 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 with the first end of the second resistor and the first end of the second diode group.
3. The dynamic negative feedback amplification circuit of claim 1, wherein the diode group comprises a first diode group and a second diode group;
The first end of the capacitor is connected to the radio frequency 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 radio frequency signal output end;
the first end of the first diode group is connected with 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 with the second end of the second resistor and the first end of the second diode group.
4. A dynamic negative feedback amplifying circuit according to claim 2 or 3 and wherein the first resistor and the second resistor are not equal in resistance.
5. The dynamic negative feedback amplification circuit of claim 1, wherein the diode group comprises at least one field effect transistor.
6. The dynamic negative feedback amplification circuit of claim 5, wherein the gate and source of the field effect transistor are coupled.
7. The dynamic negative feedback amplification circuit of claim 5, wherein the gate and drain of the field effect transistor are coupled.
8. The dynamic negative feedback amplification circuit of claim 1, wherein the power amplifier comprises a differential power amplifier, the radio frequency signal input comprises a first radio frequency signal input and a second radio frequency signal input, and the radio frequency signal output comprises a first radio frequency signal output and a second radio frequency signal output;
the signal input end comprises a first signal input end and a second signal input end, and the signal output end comprises a first signal output end and a second signal output end;
the first radio frequency signal input end is connected to the first signal input end, the second radio frequency signal input end is connected to the second signal input end, the first radio frequency signal output end is connected to the first signal output end, and the second radio frequency signal output end is connected to the second signal output end;
the dynamic negative feedback circuit comprises a first dynamic negative feedback circuit and a second dynamic negative feedback circuit;
a first end of the first dynamic negative feedback circuit is coupled to the first radio frequency signal output end, and a second end of the first dynamic negative feedback circuit is coupled to the first radio frequency signal input end; the first end of the second dynamic negative feedback circuit is coupled to the second radio frequency signal output end, and the second end of the second dynamic negative feedback circuit is coupled to the second radio frequency signal input end.
9. The dynamic negative feedback amplification circuit of claim 8, wherein an end of the first resistor of the first dynamic negative feedback circuit remote from the diode unit is connected to the first radio frequency signal input terminal, and an end of the capacitor of the first dynamic negative feedback circuit remote from the diode unit is connected to the first radio frequency signal output terminal;
one end of the first resistor of the second dynamic negative feedback circuit, which is far away from the diode unit, is connected to the second radio frequency signal input end, and one end of the capacitor of the second dynamic negative feedback circuit, which is far away from the diode unit, is connected to the second radio frequency signal output end.
10. The dynamic negative feedback amplification circuit of claim 9, wherein the diode group comprises 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 end or the second radio frequency signal input end, 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, and the second end of the capacitor is connected to the first radio frequency signal output end or the second radio frequency signal output end;
The first end of the first diode group is connected with the second end of the first resistor and the second end of the second diode group, and the second end of the first diode group is connected with the second end of the second resistor and the first end of the second diode group.
11. The dynamic negative feedback amplification circuit of claim 8, wherein an end of the capacitor of the first dynamic negative feedback circuit remote from the diode unit is connected to the first radio frequency signal input terminal, and an end of the first resistor of the first dynamic negative feedback circuit remote from the diode unit is connected to the first radio frequency signal output terminal;
one end of the capacitor of the second dynamic negative feedback circuit, which is far away from the diode unit, is connected to the second radio frequency signal input end, and one end of the first resistor of the second dynamic negative feedback circuit, which is far away from the diode unit, is connected to the second radio frequency signal output end.
12. The dynamic negative feedback amplification circuit of claim 11, wherein the diode group comprises 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 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 first radio frequency signal output end or the second radio frequency signal output end;
The first end of the first diode group is connected with 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 with the first end of the second resistor and the first end of the second diode group.
13. The dynamic negative feedback amplification circuit of claim 10 or 12, wherein the first resistor and the second resistor are not equal in resistance.
14. An electronic product comprising a dynamic negative feedback amplifying circuit according to any of claims 1-13.
CN202311825244.9A 2023-12-28 2023-12-28 Dynamic negative feedback amplifying circuit and electronic product Active CN117478078B (en)

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CN1525639A (en) * 2003-02-26 2004-09-01 李相前 A low distortion Class D amplifier
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CN1525639A (en) * 2003-02-26 2004-09-01 李相前 A low distortion Class D amplifier

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