Power control circuit based on E-type power amplifier

Abstract

The invention discloses a power control circuit based on an E-type power amplifier, and belongs to the field of radio frequency integrated circuits. The circuit comprises a digital control module for generating and outputting digital control bits corresponding to a target power value; a digital-to-analog conversion module, wherein the input of the digital-to-analog conversion module is connected with the output of the digital control module, and the digital control bits are converted into corresponding direct-current bias voltage which is output through a first output port; a power amplification module, wherein the input side of the power amplification module is provided with a bias circuit, a bias node of the bias circuit is connected with the first output port, an external square wave signal is input into the power amplification module under the action of the bias circuit, and the square wave signal is a non-ideal square wave signal; the DC bias voltage changes the DC bias of the square wave signal so as to adjust the duty ratio of the signal actually input to the power amplification module, thereby adjusting the output power of the power amplification module. The non-ideal characteristic of a square wave signal transmitted in an actual circuit is utilized, the duty ratio adjustment is realized by controlling the direct current bias of an input signal, and the circuit design complexity is simplified.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuits, and more specifically relates to a power control circuit based on a class E power amplifier. Background technique [0002] In traditional Class A, B, and C power amplifiers (Power Amplifier, PA), transistors are used as controlled current sources, working in the saturation region, and linearly amplifying input signals, which can be applied to all modulation methods. However, the inherent DC bias current of the transistor will cause a large energy loss, so the efficiency of the traditional linear amplifier is low. In the non-linear class E power amplifier, the input switching tube works in the cut-off area and the linear area, the digital frequency modulation signal controls the periodic conduction and disconnection of the input MOS tube, and the amplified voltage and current signal is output, and then obtained through the frequency selection network. The input signal is a sine ...

AI Technical Summary

Problems solved by technology

Traditional measures to increase the output power adjustment range of Class E power amplifiers have greatly increased the complexity of circuit design, which is contrary to its original intention of low-cost application scenarios

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