Patent ID: 8994450
Filing Date: 2015-03-31
Classification: H03F

Abstract:
1. A method for improving power amplification efficiency of a Doherty power amplifier, wherein the method is applied to the Doherty power amplifier that has two paths of Doherty circuit units connected in parallel, each of the Doherty circuit units comprises a main power amplifier and a peak power amplifier, the main power amplifier and the peak power amplifier are connected in parallel, and the method comprises: when output power of the Doherty power amplifier is within a low out power range, adjusting, by a bias circuit, gate voltages of main power amplifiers and peak power amplifiers in the two paths of Doherty circuit units connected in parallel, in order to cause the peak power amplifiers to be in an off state, and the main power amplifiers in the two paths of Doherty circuit units connected in parallel to be in a main power amplification state and a peak power amplification state respectively, wherein the adjusting, by the bias circuit, comprises: receiving, by the bias circuit, a control command that is sent by a control circuit, wherein the control command comprises values of gate voltages currently required by the main power amplifiers and the peak power amplifiers; and adjusting gate voltages of the main power amplifiers and the peak power amplifiers according to the values of the gate voltages currently required by the main power amplifiers and the peak power amplifiers.