Radio frequency power stabilization amplifier circuit

Abstract

The utility model discloses a radio frequency power stabilization amplifier circuit, which relates to the technical field of amplifier circuits, and comprises an amplifier body, the negative input end of the amplifier body is connected with a first resistor, a second resistor, a third resistor and a ground which are connected in series, and is additionally connected with a first capacitor, a second capacitor, a third capacitor and a ground which are connected in series; the output end of the amplifier body is connected with one end of the first selector and one end of the second selector, the other end of the first selector is connected with the other end of the first resistor or the second resistor, and the other end of the second selector is connected with the other end of the first capacitor or the second capacitor. The circuit has the advantages that the first selector is additionally arranged to replace and connect the first resistor or the first resistor and the second resistor, and the second selector is additionally arranged to replace and connect the first capacitor or the first capacitor and the second capacitor, so that various circuits can be matched and replaced conveniently, the circuit can be better applied, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of amplifier circuits, and more specifically to a radio frequency power stabilizing amplifier circuit. Background Art

[0002] RF power amplifiers are widely used in radar, communication, navigation, satellite ground stations, and electronic countermeasure equipment. Compared with low-noise amplifiers, RF power amplifiers not only have to meet certain gain, standing wave ratio, and frequency band requirements, but also have more prominent requirements such as high output power, high conversion efficiency, and reduced nonlinear distortion.

[0003] Existing RF power amplifiers (such as application number: CN201510301183.5, a high-power RF amplifier circuit with stable performance), the above-mentioned “by taking advantage of the inherent performance of the amplifier and adding the variable characteristics of the triode, the circuit has stable performance and flexible adjustability”;

[0004] In order to improve the stability of the circuit (such as application number: CN201810313400.6, a radio frequency power amplifier circuit), (application number: CN201620697343.2, an operational amplifier with feedback loop compensation), etc., it is proposed to use a "resistance, voltage parallel circuit" for strengthening, but the proposed strengthening method, the strengthening circuit formed by its specific implementation is relatively simple and lacks flexibility in change. Utility Model Content

[0005] The purpose of the utility model is to solve the above technical problems and provide a radio frequency power stabilization amplifier circuit.

[0006] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0007] The utility model proposes a radio frequency power stabilization amplifier circuit, comprising an amplifier body, which has a positive input terminal, a negative input terminal, and at least one output terminal;

[0008] The negative input end of the amplifier body is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, and the other end of the third resistor is grounded;

[0009] The negative input terminal of the amplifier body is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the second capacitor, the other end of the second capacitor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded;

[0010] The output end of the amplifier body is connected to one end of the first selector and the second selector respectively, the other end of the first selector is connected to the other end of the first resistor or the second resistor, and the other end of the second selector is connected to the other end of the first capacitor or the second capacitor.

[0011] As a preferred technical solution of the utility model, it also includes a fourth capacitor, one end of which is connected to the negative input terminal of the amplifier body and the other end is grounded, and the fourth capacitor is a parasitic capacitor.

[0012] As a preferred technical solution of the present utility model, the first selector and the second selector are dual-way switch ICs.

[0013] As a preferred technical solution of the present utility model, the first resistor, the second resistor and the third resistor are adjustable resistors.

[0014] As a preferred technical solution of the utility model, the adjustable resistor is a carbon film resistor.

[0015] As a preferred technical solution of the utility model, the model of the amplifier body is: TDA7294.

[0016] The beneficial effects of the utility model are as follows:

[0017] By adding a first selector S1 to replace the connection of the first resistor R1 or the first resistor R1 and the second resistor R2, and adding a second selector S2 to replace the connection of the first capacitor C1 or the first capacitor C1 and the second capacitor C2, a variety of circuit combinations and convenient replacements can be performed; at the same time, the first resistor R1, the second resistor R2 and the third resistor R3 are adjustable resistors, which can be used for more circuit combinations, better applications, and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Reference numerals: amplifier body-U, first resistor-R1, second resistor-R2, third resistor-R3, first selector-S1, first capacitor-C1, second capacitor-C2, third capacitor-C3, second selector-S2, fourth capacitor-CP. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, the utility model proposes: a radio frequency power stabilization amplifier circuit, comprising an amplifier body U (the model of the amplifier body U can be: TDA7294, etc.), which has a positive input terminal and a negative input terminal, and at least one output terminal;

[0021] The negative input end of the amplifier body U is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is grounded (as shown in the figure, that is, the first resistor R1, the second resistor R2, and the third resistor R3 are connected in series);

[0022] The negative input end of the amplifier body U is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is grounded (as shown in the figure, that is, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are connected in series);

[0023] The output end of the amplifier body U is connected to one end of the first selector S1 and one end of the second selector S2 respectively;

[0024] The other end of the first selector S1 is connected to the other end of the first resistor R1 or the second resistor R2 (as shown in the figure: when connected to the other end of the first resistor R1, only the first resistor R1 is connected; when connected to the other end of the second resistor R2, only the first resistor R1 and the second resistor R2 are connected to increase the resistance value), (the third resistor R3 is grounded to protect the circuit);

[0025] Wherein, the first resistor R1, the second resistor R2 and the third resistor R3 are adjustable resistors, and the adjustable resistors are carbon film resistors, etc.;

[0026] The other end of the second selector S2 is connected to the other end of the first capacitor C1 or the second capacitor C2 (as shown in the figure: when connected to the other end of the first capacitor C1, only the first capacitor C1 is connected; when connected to the other end of the second capacitor C2, only the first capacitor C1 and the second capacitor C2 are connected to increase the resistance value) (the third capacitor C3 is grounded to protect the circuit);

[0027] Wherein, the first selector S1 and the second selector S2 are dual-way switch ICs, etc.;

[0028] Wherein, it also includes a fourth capacitor CP, one end of which is connected to the negative input terminal of the amplifier body U and the other end is grounded, and the fourth capacitor CP is a parasitic capacitor (wherein: the fourth capacitor CP may be the “parasitic capacitor” proposed in “CN201620697343.2” proposed in the background technology);

[0029] A fourth capacitor CP is set here, and the fourth capacitor CP plays a role of buffering the input signal of the amplifier (plays a role of smoothing the input signal voltage, which can improve the signal-to-noise ratio and stability of the amplifier);

[0030] When the input signal amplitude of the amplifier body U is large, the amplifier body U will be charged, and when the input signal amplitude of the amplifier is small, the amplifier body U will release the charge; in this way, the amplifier input signal can maintain a stable voltage within a certain range, thereby avoiding the fluctuation of the amplifier input voltage; it plays the role of smoothing the input signal voltage, which can improve the signal-to-noise ratio and stability of the amplifier;

[0031] Specifically, when the amplitude of the amplifier input signal is small, the amplifier body U will slowly release the charge, so that the input signal voltage of the amplifier body U gradually increases until the resistance value connected to the negative input terminal is equal; at this time, the output terminal voltage of the amplifier body U is equal to the input terminal voltage, and the input signal reaches a stable state;

[0032] When the input signal amplitude of the amplifier body U is large, the parasitic capacitor will be charged. When the charged charge reaches a certain value, the parasitic capacitor will release the excess charge through the resistor connected to the negative input terminal, causing the input signal voltage of the amplifier body U to gradually decrease until it is equal to the resistance value of the resistor connected to the output terminal. At this time, the output terminal voltage of the amplifier body U is equal to the input terminal voltage, and the input signal has also reached a stable state.

[0033] according to Figure 1 , the circuit loop of the utility model includes, as shown below:

[0034] (1) The negative input terminal of the amplifier body U is connected to the fourth capacitor CP, the first resistor R1 and the first capacitor C1 are connected in parallel, and are connected between the negative input terminal and the output terminal of the amplifier body U;

[0035] (2) The negative input terminal of the amplifier body U is connected to the fourth capacitor CP, the first resistor R1 and the first capacitor C1 and the second capacitor C2 connected in series are connected in parallel, and are connected between the negative input terminal and the output terminal of the amplifier body U;

[0036] (3) The negative input terminal of the amplifier body U is connected to the fourth capacitor CP, and the first resistor R1, the second resistor R2 and the first capacitor C1 connected in series are connected in parallel, and are connected between the negative input terminal and the output terminal of the amplifier body U;

[0037] (4) The negative input terminal of the amplifier body U is connected to the fourth capacitor CP, and the first resistor R1 and the second resistor R2 connected in series and the first capacitor C1 and the second capacitor C2 connected in series are connected in parallel, and are connected between the negative input terminal and the output terminal of the amplifier body U.

[0038] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A radio frequency power stabilization amplifier circuit, comprising an amplifier body having a positive input terminal and a negative input terminal, and at least one output terminal; The negative input end of the amplifier body is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, and the other end of the third resistor is grounded; The negative input terminal of the amplifier body is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end of the second capacitor, the other end of the second capacitor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded; It is characterized in that The output end of the amplifier body is connected to one end of the first selector and the second selector respectively, the other end of the first selector is connected to the other end of the first resistor or the second resistor, and the other end of the second selector is connected to the other end of the first capacitor or the second capacitor.

2. The radio frequency power stabilization amplifier circuit according to claim 1, characterized in that: It also includes a fourth capacitor, one end of which is connected to the negative input terminal of the amplifier body and the other end is grounded, and the fourth capacitor is a parasitic capacitor.

3. The radio frequency power stabilization amplifier circuit according to claim 1, characterized in that: The first selector and the second selector are dual-way switch ICs.

4. The radio frequency power stabilization amplifier circuit according to claim 1, characterized in that: The first resistor, the second resistor and the third resistor are adjustable resistors.

5. The radio frequency power stabilization amplifier circuit according to claim 4, characterized in that: The adjustable resistor is a carbon film resistor.

6. The radio frequency power stabilization amplifier circuit according to claim 1, characterized in that: The model of the amplifier body is: TDA7294.

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