Power amplifier temperature compensation device and method

Abstract

The invention discloses a temperature compensating device and a method for a power amplifier. The device comprises a detection module, an analog-to-digital conversion module, a control module, and a digital-to-analog converter module, wherein the detection module is used for detecting the working current of the power amplifier, obtaining the corresponding voltage based on the working current and transmitting the voltage to the analog-to-digital conversion module; the analog-to-digital conversion module is used for receiving the voltage from the detection module and converting the voltage to adigital signal and transmitting to the control module; the control module is used for receiving the digital signal from the analog-to-digital conversion module, obtaining a regulation value based on the digital signal value and a preset value and transmitting the regulation value to the digital-to-analog converter module; and the digital-to-analog converter module is used for receiving the regulation value from the control module, and transmitting the analog signal corresponding to the regulation value to the control terminal of the power amplifier to superpose with the original control signalof the power amplifier. The invention can realize real-time monitoring and compensation of the working current of the power amplifier.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a power amplifier temperature compensation device and method. Background technique [0002] In base stations, broadcasting, cable television and satellite communications, when the traffic volume of some power amplifiers changes, the output power of some power amplifiers also needs to change accordingly, and the change of power makes the power consumption of these power amplifiers also change. The increase in power consumption will cause the power amplifier to heat up, resulting in an increase in temperature. At the same time, changes in the ambient temperature will also affect the temperature. [0003] The following takes the power amplifier tube, the main device in the final power amplifier of the radio frequency front end of the base station, as an example to explain the reason why the power amplifier needs to be temperature compensated. [0004] The relationship between t...

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Problems solved by technology

[0026] Although this method can control the current value of the power amplifier more accurately, if it is necessary to do a temperature experiment in advance for each power amplifier to obtain a table of grid voltage variation with temperature, a lot of energy will be wasted; and if most of the power amplifiers They all share a grid voltage variation table of the power amplifier with temperature, which will affect the accuracy of temperature compensation due to the discrete nature of the device.

[0027] The above two methods of temperature compensation for power amplifiers can be attributed to indirect compensation methods. The indirect method of power amplifier temperature compensation will inevitably be affected by the discreteness of devices, that is, it may cause poor compensation effects for individual devices in the batch, thereby reducing Index pass rate; in order to make up for the discreteness of indirect temperature compensation, power amplifier tubes with higher power have to be used to ensure the linearity index of batch power amplifiers in the full temperature range, which largely wastes device costs and Power Efficiency

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