CIRCUIT AND METHOD FOR LINEARIZING IN HIGH-POWER AMPLIFIER USING PREDISTORTION

摘要

PURPOSE: A linearization circuit of a high power amplifier is provided to use a predistortion system applying a feed-forward method, so as to improve distortion characteristics of the high power amplifier used in a wireless transmitting device. CONSTITUTION: A front amplifier(100) amplifies an inputted signal for predistortion. The first variable signal attenuator(200) variably attenuates the strength of a pre-amplified input signal. A divider(300) separates a pre-attenuated signal into two paths. An error signal generator(400) detects and generates an error signal for improving distortion characteristics of an amplifier. A signal delayer(500) linearly changes or delays an input signal which becomes a reference signal of a pre-generated error signal. A combiner(600) combines an output signal of the error signal generator(400) with an output signal of the signal delayer(500). An end signal attenuator(700) attenuates the strength of a signal outputted by being pre-coupled. An end amplifier(800) amplifies a final output signal.