FEED-FORWARD LINEAR POWER AMPLIFIER WITH AMPLIFIER FOR COMPENSATING DELAY

摘要

The linear power amplifier according to the present invention replaces the delay line of the auxiliary path of the signal loop with a delay amplifier to improve the circuit configuration. Another linear power amplifier according to the present invention moves the main power amplifier located in the main path of the signal loop to the main path of the error loop, and places a drive amplifier in the main path of the signal loop and horns the auxiliary path of the signal loop. By arranging the modulation amplifier, the operation delay time caused by the driving amplifier is compensated, and since the main power amplifier is located in the error loop, the signal attenuator of the signal loop is extracted by using a hybrid coupler instead of the directional coupler. Minimize the attenuation of The feedforward linear power amplifier according to the present invention eliminates the circuit by replacing the delay line, which was the main cause of the volume and fine tuning problem in the general feedforward linear power amplifier, with a corresponding delay amplifier or intermodulation amplifier. The miniaturization and the fine adjustment can be efficiently controlled to further improve the suppression characteristics of intermodulation distortion components.