Self-adaptive grid-voltage compensator and its compensation

Abstract

The invention is concerned with gate bias self-adaptive compensation device and method, relating to radio frequency switch circuit, LDMOS apparatus amplificatory circuit, MCU control circuit, A / D circuit 1, A / D circuit 2, D / A circuit, temperature testing circuit and drain current testing circuit. The said radio frequency switch circuit connects with LDMOS apparatus amplificatory circuit, temperature testing circuit, A / D circuit 2, MCU control circuit into a loop. While the said radio frequency switch circuit connects with LDMOS apparatus amplificatory circuit, drain current testing circuit, A / D circuit 1 and MCU control circuit into another loop. The said D / A circuit connects between the MCU control circuit and the LDMOS apparatus amplificatory circuit. It solves the problem of radio frequency stabilization to power amplifier by temperature expiation of gate bias, to enhance the radio frequency capability of power amplifier.

Description

technical field [0001] The invention relates to the field of power amplifiers in mobile communication systems, in particular to a grid voltage adaptive compensation device and a grid voltage adaptive compensation method thereof. Background technique [0002] Power amplifiers play a pivotal role in communication systems and have been a research hotspot for many years. At present, LDMOS amplifiers are widely used in the design of power amplifiers. Due to the inherent characteristics of LDMOS amplifiers, in order to ensure the RF performance of power amplifiers, it is necessary to perform temperature compensation on the gate voltage of LDMOS amplifiers. [0003] Common gate voltage temperature compensation methods are roughly divided into two types: linear slope compensation method and look-up table compensation method. The principle of the linear slope compensation method: save a specific gate voltage value at a certain temperature, and use this value...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a grid voltage adaptive compensation device and its grid voltage adaptive compensation method. The present invention obtains the initial value by introducing an adaptive method, and according to the LDMOS amplifying device Features, the temperature is divided into three sections of high, medium and low for temperature compensation, which solves the problem that the grid voltage temperature compensation cannot make the radio frequency index of the power amplifier stable enough, thus greatly improving the radio frequency performance index of the power amplifier

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