US 2014/0191806 A1Published application

Electronic system - radio frequency power amplifier and method for dynamic adjusting bias point

AssigneeAdvanced Semiconductor Engineering, Inc.

InventorsJAW-MING DING, CHIEN-YEH LIU

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Abstract

A radio frequency (RF) power amplifier is disclosed. The RF power amplifier includes a bias circuit, an output stage circuit and dynamic bias controlling circuit. The bias circuit receives a first system voltage and provides a working voltage accordingly. The output stage circuit receives the working voltage so as to work at an operation bias point. The dynamic bias controlling circuit detects a RF input signal and outputs a compensation voltage to the bias circuit according to variation of the RF input signal, wherein the dynamic bias controlling circuit is an open loop configuration. When an input power of the RF input signal increases and makes the working voltage decreases so as to shift the operation bias point, the bias circuit adjusts the working voltage upward so as to recover or enhance the operation bias point according to the compensation voltage received.

Claims10

Dependent claims

A RF power amplifier, used for amplifying a RF input signal received, the RF power amplifier comprising:

a bias circuit, receiving a first system voltage, and providing a work voltage according to the first system voltage;
an output-stage circuit, electrically connected to the bias circuit, the output-stage circuit receiving the work voltage so as to operate at an operation bias point;
and
a dynamic bias controlling circuit, electrically connected between the bias circuit and the output-stage circuit, the dynamic bias controlling circuit detecting the RF input signal and outputting a compensation voltage to the bias circuit according to change of the RF input signal,
wherein when input power of the RF input signal increases such that the operation bias point offsets and the work voltage decreases, the work voltage is increased by the bias circuit according to the compensation voltage received so as to recover or elevate the operation bias point.

2 more elements

Dependencies are inferred from the claim text.