CN213367730U - Power amplifier electronic control biasing device with automatic compensation function - Google Patents
Power amplifier electronic control biasing device with automatic compensation function Download PDFInfo
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- CN213367730U CN213367730U CN202022517154.1U CN202022517154U CN213367730U CN 213367730 U CN213367730 U CN 213367730U CN 202022517154 U CN202022517154 U CN 202022517154U CN 213367730 U CN213367730 U CN 213367730U
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Abstract
The utility model discloses an automatically controlled biasing arrangement of power amplifier with automatic compensation function, include the power amplifier unit of constituteing by a N power amplifier, be equipped with the temperature sensor who detects whole power amplifier unit temperature on the power amplifier unit, temperature sensor's output is connected to little the control unit's input, little the control unit's output is connected to the digital analog converter's that satisfies a N amplifier bias output driving ability input, digital analog converter's output is connected with the potentiometre that corresponds each power amplifier, and the output of each potentiometre is connected to the amplifier bias that corresponds power amplifier. The utility model discloses can unify all power amplifier in the power amplifier unit and carry out automatically controlled biasing to can finely tune to every power amplifier's difference, can also carry out temperature compensation simultaneously, solve that traditional power amplifier can only bias alone and the control that traditional power amplifier temperature processing method leads to is inaccurate, the power amplifier tube damages easily, the big problem of device discreteness.
Description
Technical Field
The utility model relates to a power amplifier biasing means always especially relates to an automatically controlled biasing means of power amplifier with automatic compensation function.
Background
1. Conventional power amplifier biasing devices are generally classified into two types: one is an analog type in which the power supply voltage of the power amplifier is used as a basis to stabilize the power supply voltage and the potentiometer is adjusted, and the other is a digital control type using a digital control potentiometer or a microcontroller. The voltage-stabilizing type of the analog power supply can only be manually adjusted, and can not realize electric control, and the adjustment is inconvenient during use. The numerical control type is that each amplifier is controlled independently, the device uses a plurality of circuits and is complicated, and when a plurality of amplifiers are used simultaneously, the control is required according to addresses. Neither of the above two methods can accomplish unified compensation control at the same time.
2. The power of the power amplifier unit is generally determined by the characteristics of the power amplifier tube, when the temperature changes, the power output changes, and some power amplifier tubes are damaged due to the temperature change and have large linear changes.
In the market, the power amplifier tube is usually controlled by a thermistor, and the thermistor is used in a temperature control link of the power amplifier. This approach presents several problems:
1) inaccurate control and even opposite effect.
2) The active amplifier tube is easy to damage and the power output is changed too much.
3) The device has large discreteness and poor consistency.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a power amplifier automatically controlled biasing arrangement with automatic compensation function.
In order to achieve the above purpose, the technical scheme of the utility model is that: an electric control biasing device of a power amplifier with an automatic compensation function comprises a power amplifier unit consisting of N power amplifiers, wherein a temperature sensor for detecting the temperature of the whole power amplifier unit is arranged on the power amplifier unit, the output end of the temperature sensor is connected to the input end of a micro control unit, the output end of the micro control unit is connected to the input end of a digital-to-analog converter meeting the bias output driving capability of the N amplifiers, the output end of the digital-to-analog converter is connected with potentiometers corresponding to the power amplifiers, and the output end of each potentiometer is connected to the amplifier bias of the corresponding power amplifier;
the micro control unit generates an output digital quantity control command according to the characteristics of the amplifier, the digital quantity of the control command is converted by the digital-to-analog converter and then outputs N paths of bias voltages, and each path of bias voltage is input into the amplifier bias of the corresponding power amplifier after being finely adjusted by the potentiometer, so that the uniform bias control of a plurality of power amplifiers is realized;
when the temperature sensor detects that the temperature of the power amplifier unit changes, the micro control unit outputs a digital quantity control command to change the bias voltage, so that the temperature change direction of the power amplifier is reversely adjusted.
The utility model has the advantages that: the utility model discloses an automatically controlled biasing arrangement can be to all power amplifier unification carry out automatically controlled biasing in the power amplifier unit to can finely tune to every power amplifier's difference, can also carry out temperature compensation simultaneously, solve that traditional power amplifier can only bias alone and the control that traditional power amplifier temperature processing method leads to is inaccurate, the power amplifier tube damages easily, the big problem of device discreteness, the circuit is simple moreover, with low costs, the wide popularization of being convenient for.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 1, an electronic control bias device for a power amplifier with an automatic compensation function includes a micro control unit 1 for generating an output digital quantity control command according to the characteristics of the amplifier, the micro control unit 1 outputs a digital quantity to a digital-to-analog converter 2, the digital-to-analog converter 2 outputs an analog quantity as a bias voltage value, the bias voltage output by the digital-to-analog converter 2 is connected to N power amplifier bias voltage input points, the voltage input points are provided with potentiometers 3, the bias voltage can be finely adjusted by the potentiometers 3 and sent to an amplifier bias 4, the fine adjustment can adjust the discrete difference values of the N power amplifiers to be the same through testing quiescent current, and thus, the unified bias control of the plurality of power amplifiers is realized.
The power amplifier circuit further comprises a temperature sensor 5 for detecting the real-time temperature of the power amplifier unit, wherein the temperature sensor 5 is connected to the micro control unit 1, and the micro control unit 1 outputs a digital quantity according to the temperature change to change the bias voltage so as to reversely adjust the temperature change direction of the power amplifier. Namely, when the power amplifier tube changes along with the temperature, the power amplifier bias voltage is adjusted according to the characteristics of the power amplifier tube, so that the gain of the power amplifier is corrected, and the function of temperature compensation is achieved. The correction process of the power amplifier gain comprises the following steps: when the temperature sensor 5 detects that the temperature rises, the micro control unit 1 controls the digital-to-analog converter 2 to output an offset voltage value to increase, so that the gain of the power amplifier is improved; when the temperature sensor 5 detects that the temperature is reduced, the micro control unit 1 controls the digital-to-analog converter 2 to output a bias voltage value to be reduced, so that the power amplifier gain is reduced. It can be seen that the power amplifier tube forms a closed loop by the temperature sensor 5, the micro control unit 1, the digital-to-analog converter 2, the potentiometer 3 and the amplifier bias 4, and the power amplifier gain is controlled by adjusting the bias 4 to correct the power value of the whole output power, so that the nonlinear temperature compensation control can be formed.
The digital-to-analog converter 2 is required to have a driving capability that satisfies N amplifier bias output, such as insufficient output to be coupled to a follower of the amplifier stage. The temperature sensor 5 may be mounted on the power amplifier unit heat sink.
The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (1)
1. An electric control biasing device of a power amplifier with an automatic compensation function is characterized by comprising a power amplifier unit consisting of N power amplifiers, wherein a temperature sensor for detecting the temperature of the whole power amplifier unit is arranged on the power amplifier unit, the output end of the temperature sensor is connected to the input end of a micro control unit, the output end of the micro control unit is connected to the input end of a digital-to-analog converter meeting the biasing output driving capability of the N amplifiers, the output end of the digital-to-analog converter is connected with potentiometers corresponding to the power amplifiers, and the output end of each potentiometer is connected to the amplifier bias of the corresponding power amplifier;
the micro control unit generates an output digital quantity control command according to the characteristics of the amplifier, the digital quantity of the control command is converted by the digital-to-analog converter and then outputs N paths of bias voltages, and each path of bias voltage is input into the amplifier bias of the corresponding power amplifier after being finely adjusted by the potentiometer, so that the uniform bias control of a plurality of power amplifiers is realized;
when the temperature sensor detects that the temperature of the power amplifier unit changes, the micro control unit outputs a digital quantity control command to change the bias voltage, so that the temperature change direction of the power amplifier is reversely adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022517154.1U CN213367730U (en) | 2020-11-04 | 2020-11-04 | Power amplifier electronic control biasing device with automatic compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022517154.1U CN213367730U (en) | 2020-11-04 | 2020-11-04 | Power amplifier electronic control biasing device with automatic compensation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213367730U true CN213367730U (en) | 2021-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022517154.1U Active CN213367730U (en) | 2020-11-04 | 2020-11-04 | Power amplifier electronic control biasing device with automatic compensation function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213367730U (en) |
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2020
- 2020-11-04 CN CN202022517154.1U patent/CN213367730U/en active Active
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