CN216599558U - AGC temperature compensation circuit - Google Patents
AGC temperature compensation circuit Download PDFInfo
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- CN216599558U CN216599558U CN202122692864.2U CN202122692864U CN216599558U CN 216599558 U CN216599558 U CN 216599558U CN 202122692864 U CN202122692864 U CN 202122692864U CN 216599558 U CN216599558 U CN 216599558U
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Abstract
The utility model discloses an AGC temperature compensation circuit, comprising: the automatic gain control circuit comprises an AGC control circuit, an AGC input circuit, an AGC output circuit, a first temperature compensation circuit, a second temperature compensation circuit, a first adder and a second adder; the AGC control circuit is respectively connected with a first output end of the AGC input circuit, a signal input end of the AGC output circuit, an output end of the first adder and an output end of the second adder; a second output end of the AGC input circuit is connected with a first input end of the first adder, and the first temperature compensation circuit is connected with a second input end of the first adder; and a first output end of the AGC output circuit is connected with a first input end of the second adder, and the second temperature compensation circuit is connected with a second input end of the second adder. The utility model can carry out temperature compensation adjustment on the AGC under the condition of not changing the AGC performance, reduces the influence of temperature on the circuit and simultaneously improves the compatibility.
Description
Technical Field
The utility model belongs to the technical field of automatic gain control of radio frequency signals, and particularly relates to an AGC temperature compensation circuit.
Background
With the development of communication technology, an AGC (Automatic Gain Control) output amplitude limiting device that adjusts an output signal by using an effective combination of linear amplification and compression amplification at present can make the amplitude of the output signal stable or limited to change within a small range when the amplitude of an input signal changes greatly, thereby solving the problem of signal intensity in various technologies.
However, in the prior art, most of the power amplifier AGC temperature compensation circuits adopt an input detection main circuit and an output detection main circuit to realize the temperature compensation circuit through a radio frequency temperature compensator, and when the temperature changes, the radio frequency temperature attenuator adjusts the sizes of input detection signals and output detection signals, so that the sizes of the detection signals change, and the same input detection signal size and the same normal temperature are ensured to be consistent at different temperatures.
However, in the prior art, the radio frequency temperature attenuator can bring about the problem that the gain flatness and the standing wave change to the main detection path, so that the detector flatness changes, and the performance of AGC is affected.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an AGC temperature compensation circuit, which solves the problems that the detection flatness changes due to the adoption of a temperature compensation attenuator and how to realize accurate temperature compensation on the AGC circuit in the prior art.
In order to solve the above technical problem, the present invention provides an AGC temperature compensation circuit, including: the automatic gain control circuit comprises an AGC control circuit, an AGC input circuit, an AGC output circuit, a first temperature compensation circuit, a second temperature compensation circuit, a first adder and a second adder;
the AGC control circuit is respectively connected with a first output end of the AGC input circuit, a signal input end of the AGC output circuit, an output end of the first adder and an output end of the second adder;
a second output end of the AGC input circuit is connected with a first input end of the first adder, and the first temperature compensation circuit is connected with a second input end of the first adder;
and a first output end of the AGC output circuit is connected with a first input end of the second adder, and the second temperature compensation circuit is connected with a second input end of the second adder.
Preferably, the AGC input circuit further includes a power divider, a first detector, and an input amplifier;
the signal input end of the AGC input circuit is connected with the input end of the power divider, the first output end of the AGC input circuit is connected with the first output end of the power divider, the second output end of the AGC input circuit is connected with the output end of the first detector, the second output end of the power divider is connected with the input end of the input amplifier, and the output end of the input amplifier is connected with the input end of the first detector.
Preferably, the AGC output circuit further comprises a coupler and a second detector;
the signal input end of the AGC output circuit is connected with the input end of the coupler, the first output end of the AGC output circuit is connected with the output end of the second detector, the second output end of the AGC output circuit is connected with the first output end of the coupler, and the second output end of the coupler is connected with the input end of the second detector.
Preferably, the first temperature compensation circuit comprises a first thermistor, a first resistor, a second resistor, a third resistor and a first comparator;
a first input end of the first comparator is connected with a first resistor, and the other end of the first resistor is grounded;
a second input end of the first comparator is respectively connected with the second resistor and the third resistor, the other end of the second resistor is connected with the first thermistor, and the other end of the third resistor is grounded;
and the output end of the first comparator is connected with the output end of the first temperature compensation circuit.
Preferably, the second temperature compensation circuit comprises a second thermistor, a fourth resistor, a fifth resistor, a sixth resistor and a second comparator;
a first input end of the second comparator is connected with a fourth resistor, and the other end of the fourth resistor is grounded;
a second input end of the second comparator is respectively connected with the fifth resistor and the sixth resistor, the other end of the fifth resistor is connected with the second thermistor, and the other end of the sixth resistor is grounded;
and the output end of the second comparator is connected with the output end of the second temperature compensation circuit.
Preferably, the other end of the first thermistor and the other end of the second thermistor are both connected with a regulated power supply.
Preferably, the AGC control circuit includes: the system comprises an attenuator, a main circuit amplifier, an FPGA chip, a first operational amplifier and a second operational amplifier;
a first input end of the attenuator is connected with an output end of the FPGA chip, a second input end of the attenuator is connected with a first output end of the AGC input circuit, an output end of the attenuator is connected with an input end of the main path amplifier, and an output end of the main path amplifier is connected with a signal input end of the AGC output circuit;
a first input end in the FPGA chip is connected with an output end of the first operational amplifier, and a second input end in the FPGA chip is connected with an output end of the second operational amplifier;
the input end of the first operational amplifier is connected with the output end of the first adder, and the input end of the second operational amplifier is connected with the output end of the second adder.
Preferably, the main amplifier may be composed of a plurality of amplifier connections.
Preferably, the attenuator is an electrically controlled adjustable attenuator.
The embodiment of the application has the following beneficial effects:
compared with the prior art, the AGC temperature compensation circuit provided by the utility model has the advantages that the temperature compensation circuit and the adder are arranged outside the AGC input circuit and the AGC output circuit, and when the temperature changes, the temperature compensation circuit can generate a voltage compensation difference value caused by the temperature change, so that voltage signals output by the AGC input circuit and the AGC output circuit are adjusted, the accurate adjustment temperature compensation of AGC is realized, and the influence of a temperature compensation attenuator of the temperature compensation circuit in the prior art on the AGC detection performance is avoided.
Drawings
Fig. 1 is a schematic diagram illustrating an operation of an AGC temperature compensation circuit according to an embodiment of the present invention; fig. 2 is a structural diagram of an AGC temperature compensation circuit according to an embodiment of the present invention;
fig. 3 is a block diagram of an AGC temperature compensation circuit in the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that the embodiments described herein are only a few embodiments of the present invention, not all embodiments, and are not intended to limit the present invention. Other embodiments, which can be derived by those skilled in the art from the embodiments given herein without any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, an AGC temperature compensation circuit according to an embodiment of the present invention includes: the automatic gain control circuit comprises an AGC control circuit 103, an AGC input circuit 101, an AGC output circuit 102, a first temperature compensation circuit 104, a second temperature compensation circuit 105, a first adder 09 and a second adder 10.
The AGC control circuit 103 is respectively connected to the first output terminal of the AGC input circuit 101, the signal input terminal of the AGC output circuit 102, the output terminal of the first adder 09, and the output terminal of the second adder 10.
A second output terminal of the AGC input circuit 101 is connected to a first input terminal of the first adder 09, and the first temperature compensation circuit 104 is connected to a second input terminal of the first adder 09.
A first output terminal of the AGC output circuit 102 is connected to a first input terminal of the second adder 10, and the second temperature compensation circuit 105 is connected to a second input terminal of the second adder 10.
Preferably, the AGC input circuit 101 further includes a power divider 01, a first detector 07, and an input amplifier 06.
The signal input end of the AGC input circuit 101 is connected to the input end of the power divider 01, the first output end of the AGC input circuit 101 is connected to the first output end of the power divider 01, the second output end of the AGC input circuit 101 is connected to the output end of the first detector 07, the second output end of the power divider 01 is connected to the input end of the input amplifier 06, and the output end of the input amplifier 06 is connected to the input end of the first detector 07.
As the preferred embodiment, the power divider 01 is a microstrip power divider or a cavity power divider.
Preferably, the AGC output circuit 102 further comprises a coupler 02 and a second detector 08.
The signal input end of the AGC output circuit 102 is connected to the input end of the coupler 02, the second output end of the AGC output circuit 102 is connected to the first output end of the coupler 02, the first output end of the AGC output circuit 102 is connected to the output end of the second detector 08, and the second output end of the coupler 02 is connected to the input end of the second detector 08.
As the preferred embodiment, the coupler 02 is a directional coupler.
In the preferred embodiment, the signals input by the first detector 07 and the second detector 08 are both radio frequency signals, and the signals output by the first detector 07 and the second detector 08 are both voltage signals.
As the preferred embodiment, the first detector 07 and the second detector 08 convert the radio frequency signal at the input end into the voltage signal at the output end for output.
Preferably, the first temperature compensation circuit 104 includes a first thermistor 13, a first resistor 14, a second resistor 15, a third resistor 16, and a first comparator 17.
A first input terminal of the first comparator 17 is connected to the first resistor 14, and the other terminal of the first resistor 14 is grounded.
A second input end of the first comparator 17 is connected to the second resistor 15 and the third resistor 16, respectively, the other end of the second resistor 15 is connected to the first thermistor 13, and the other end of the third resistor 16 is grounded.
The output end of the first comparator 17 is connected with the output end of the first temperature compensation circuit 104.
As the preferred embodiment, since the first temperature compensation circuit 104 is not affected by the bandwidth of the external rf signal, the first resistor 14, the second resistor 15, and the third resistor 16 in the first temperature compensation circuit can select suitable resistors according to the requirement of the actual AGC scheme, and the resistors are not affected by the bandwidth of the rf signal.
Preferably, the second temperature compensation circuit 105 includes a second thermistor 18, a fourth resistor 19, a fifth resistor 20, a sixth resistor 21, and a second comparator 22.
A first input terminal of the second comparator 22 is connected to the fourth resistor 19, and the other terminal of the fourth resistor 19 is grounded.
A second input end of the second comparator 22 is respectively connected to the fifth resistor 20 and the sixth resistor 21, the other end of the fifth resistor 20 is connected to the second thermistor 18, and the other end of the sixth resistor 21 is grounded.
The output end of the second comparator 22 is connected with the output end of the second temperature compensation circuit 105.
As the preferred embodiment, since the second temperature compensation circuit 105 is not affected by the bandwidth of the external rf signal, the fourth resistor 19, the fifth resistor 20 and the sixth resistor 21 in the second temperature compensation circuit 105 can select suitable resistors according to the requirement of the actual AGC scheme, and the resistors are not affected by the bandwidth of the rf signal.
Preferably, the other end of the first thermistor 13 and the other end of the second thermistor 18 are both connected with a regulated power supply.
Preferably, the first resistor 14, the second resistor 15, the third resistor 16, the fourth resistor 19, the fifth resistor 20 and the sixth resistor 21 are adjustable resistors or fixed resistors.
Preferably, the AGC control circuit includes: attenuator 04, main circuit amplifier 05, FPGA chip 03, first operational amplifier 11 and second operational amplifier 12.
A first input end of the attenuator 04 is connected to an output end of the FPGA chip 03, a second input end of the attenuator 04 is connected to a first output end of the AGC input circuit 101, an output end of the attenuator 04 is connected to an input end of the main circuit amplifier 05, and an output end of the main circuit amplifier 05 is connected to a signal input end of the AGC output circuit 102.
A first input end of the FPGA chip 03 is connected to an output end of the first operational amplifier 11, and a second input end of the FPGA chip 03 is connected to an output end of the second operational amplifier 12.
The input terminal of the first operational amplifier 11 is connected to the output terminal of the first adder 09, and the input terminal of the second operational amplifier 12 is connected to the output terminal of the second adder 10.
Preferably, the main amplifier 05 may be composed of a plurality of amplifier connections.
Preferably, the attenuator 04 is an electrically controlled adjustable attenuator.
Referring to fig. 3, fig. 3 is a structural diagram of an AGC temperature compensation circuit in the prior art, in which temperature compensation attenuators are disposed at an output end of a power divider and an output end of a coupler, and perform temperature compensation attenuation on detection at the output end of the power divider and the output end of the coupler, and when a temperature changes, the temperature compensation attenuators perform signal size adjustment on input detection and output detection, so that the monitored signal size is consistent with a normal temperature at different temperatures, thereby implementing temperature compensation.
However, due to the limitation of the temperature-compensated attenuator, the compensation effect is limited, and the temperature-compensated attenuator can bring the gain flatness and the standing wave variation to the detection signal, so that the detector flatness is changed, and the AGC performance is affected.
The principle of the utility model is as follows:
based on the limitation of a temperature compensation attenuator in the prior art, the compensation of output detection is limited, and the problems of gain flatness, standing wave change and the like are brought to main path detection, the utility model inputs input detection into an input amplifier 06 after the input of signals by a power divider 01, and then converts the input detection into an input detection voltage signal V01 by a first detector 07 to be output to a first adder 09; the coupler 02 inputs the output detection signal to the second detector 08 by inputting the signal output from the main-circuit amplifier, and the second detector 08 converts the output detection signal into an output detection voltage signal V02 and outputs the output detection voltage signal to the second adder 10. When the temperature is in a normal temperature state, the input detection voltage V01 enters the FPGA chip 03 through the first adder 09 and the operational amplifier 11, the output detection voltage signal V02 enters the FPGA chip 03 through the second adder 10 and the operational amplifier 12, and the attenuation value of the attenuator is adjusted by the FPGA chip 03.
When the temperature changes, the resistance value of the thermistor changes, so that the voltage at the input ends of the two ends of the comparator generates a difference value with the voltage at the input ends of the two ends in a normal temperature state, and the voltage values output by the first temperature compensation circuit 104 and the second temperature compensation circuit 105 change, so that the detection voltage signal output by the corresponding detector is adjusted, the effect that the voltage value input to the FPGA chip 03 is equal to the voltage value at the normal temperature is achieved, and the temperature compensation of the AGC circuit is realized.
An improvement of the present invention is to provide an AGC temperature compensation circuit that is capable of adjusting a signal in an AGC control circuit by performing temperature compensation on a detection voltage output from a detector by placing a temperature compensation circuit including a thermistor or the like behind the detectors of an AGC input circuit 101 and an AGC output circuit 102.
The embodiment of the utility model has the following effects:
the embodiment of the utility model achieves the adjustment of temperature compensation on the voltage signals output by the AGC input circuit and the AGC output circuit by arranging the temperature compensation circuit outside the AGC input circuit and the AGC output circuit, thereby realizing the accurate adjustment of temperature compensation on the AGC, avoiding the influence of a temperature compensation attenuator of the temperature compensation circuit on the AGC detection performance in the prior art, simultaneously enhancing the debugging performance of the circuit and improving the compatibility of the scheme by adjusting the resistance value in the temperature compensation circuit.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the utility model, and such modifications and enhancements are also considered to be within the scope of the utility model.
Claims (8)
1. An AGC temperature compensation circuit, comprising: the automatic gain control circuit comprises an AGC control circuit, an AGC input circuit, an AGC output circuit, a first temperature compensation circuit, a second temperature compensation circuit, a first adder and a second adder;
the AGC control circuit is respectively connected with a first output end of the AGC input circuit, a signal input end of the AGC output circuit, an output end of the first adder and an output end of the second adder;
a second output end of the AGC input circuit is connected with a first input end of the first adder, and the first temperature compensation circuit is connected with a second input end of the first adder;
and a first output end of the AGC output circuit is connected with a first input end of the second adder, and the second temperature compensation circuit is connected with a second input end of the second adder.
2. The AGC temperature compensation circuit of claim 1, wherein the AGC input circuit further comprises a power divider, a first detector, and an input amplifier;
the signal input end of the AGC input circuit is connected with the input end of the power divider, the first output end of the AGC input circuit is connected with the first output end of the power divider, the second output end of the AGC input circuit is connected with the output end of the first detector, the second output end of the power divider is connected with the input end of the input amplifier, and the output end of the input amplifier is connected with the input end of the first detector.
3. The AGC temperature compensation circuit of claim 1 wherein said AGC output circuit further comprises a coupler and a second detector;
the signal input end of the AGC output circuit is connected with the input end of the coupler, the first output end of the AGC output circuit is connected with the output end of the second detector, the second output end of the AGC output circuit is connected with the first output end of the coupler, and the second output end of the coupler is connected with the input end of the second detector.
4. The AGC temperature compensation circuit of claim 1, wherein said first temperature compensation circuit comprises a first thermistor, a first resistor, a second resistor, a third resistor, and a first comparator;
a first input end of the first comparator is connected with a first resistor, and the other end of the first resistor is grounded;
a second input end of the first comparator is respectively connected with the second resistor and the third resistor, the other end of the second resistor is connected with the first thermistor, and the other end of the third resistor is grounded;
and the output end of the first comparator is connected with the output end of the first temperature compensation circuit.
5. The AGC temperature compensation circuit of claim 1 wherein said second temperature compensation circuit comprises a second thermistor, a fourth resistor, a fifth resistor, a sixth resistor, and a second comparator;
a first input end of the second comparator is connected with a fourth resistor, and the other end of the fourth resistor is grounded;
a second input end of the second comparator is respectively connected with the fifth resistor and the sixth resistor, the other end of the fifth resistor is connected with the second thermistor, and the other end of the sixth resistor is grounded;
and the output end of the second comparator is connected with the output end of the second temperature compensation circuit.
6. The AGC temperature compensation circuit of claim 1, wherein the AGC control circuit comprises: the system comprises an attenuator, a main circuit amplifier, an FPGA chip, a first operational amplifier and a second operational amplifier;
a first input end of the attenuator is connected with an output end of the FPGA chip, a second input end of the attenuator is connected with a first output end of the AGC input circuit, an output end of the attenuator is connected with an input end of the main path amplifier, and an output end of the main path amplifier is connected with a signal input end of the AGC output circuit;
a first input end in the FPGA chip is connected with an output end of the first operational amplifier, and a second input end in the FPGA chip is connected with an output end of the second operational amplifier;
the input end of the first operational amplifier is connected with the output end of the first adder, and the input end of the second operational amplifier is connected with the output end of the second adder.
7. The AGC temperature compensation circuit of claim 6, wherein said main amplifier is comprised of a plurality of amplifier connections.
8. The AGC temperature compensation circuit of claim 6 wherein said attenuator is an electronically controlled adjustable attenuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122692864.2U CN216599558U (en) | 2021-11-02 | 2021-11-02 | AGC temperature compensation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122692864.2U CN216599558U (en) | 2021-11-02 | 2021-11-02 | AGC temperature compensation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216599558U true CN216599558U (en) | 2022-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122692864.2U Active CN216599558U (en) | 2021-11-02 | 2021-11-02 | AGC temperature compensation circuit |
Country Status (1)
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|---|---|
| CN (1) | CN216599558U (en) |
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2021
- 2021-11-02 CN CN202122692864.2U patent/CN216599558U/en active Active
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