BIAS ADAPTIVE TYPE LARGE POWER AMPLIFIER IMPROVING LINEARITY OF AMPLIFICATION, ESPECIALLY USING ENVELOPE FROM THE INPUT SIGNAL ACCORDING TO OPERATIONAL ENVIRONMENT

摘要

PURPOSE: A bias adaptive type large power amplifier is provided to improve a linearity of an amplification curve and an amplification efficiency by using a bias adaptive type large power amplifier adapted to a bias. CONSTITUTION: A bias adaptive type large power amplifier includes an amplifier(210), a bias adaption portion(220), and a power supply(230). The amplifier amplifies a high frequency input signal in response to a supply voltage. The bias adaption portion detects an envelope from the input signal, detects a variation on an environment of the amplifier, attenuates the input signal, and generates a supply voltage control signal using the envelope detected from the attenuated input signal. The power supply varies the supply voltage in response to the supply voltage control signal.