Power amplifier circuit

• Main Author: MITSUNORI SAMATA
• Format: Patent
• Language: Chinese; English
• Published: 04.12.2020
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY

The present invention provides a power amplifier circuit that efficiently amplifies power when amplifying a radio frequency signal by performing envelope tracking control. The power amplifier circuit(10) is provided with a transistor (11), wherein a power supply voltage (Vcc), which varies in accordance with the envelope of the amplitude of a radio frequency signal input to a base, is supplied toa collector electrode, and an amplified signal of the radio frequency signal is output; a first termination circuit (21) that is provided at the post-stage of the transistor (11) and attenuates the higher harmonic component of the amplified signal; and a second termination circuit (31) that is provided at the subsequent stage of the transistor and attenuates the higher harmonic component of the amplified signal. The first termination circuit (21) and the second termination circuit (31) have characteristics that resonate with respect to a radio frequency signal having a frequency between the frequency of the second har