US 12,255,590 B2
Radio frequency power amplifier, chip, and communication terminal
Jinxin Zhao, Tianjin (CN); and Yunfang Bai, Tianjin (CN)
Assigned to VANCHIP (TIANJIN) TECHNOLOGY CO., LTD., Tianjin (CN)
Filed by VANCHIP (TIANJIN) TECHNOLOGY CO., LTD., Tianjin (CN)
Filed on May 14, 2022, as Appl. No. 17/663,429.
Application 17/663,429 is a continuation of application No. PCT/CN2020/128471, filed on Nov. 12, 2020.
Claims priority of application No. 201911121417.2 (CN), filed on Nov. 15, 2019.
Prior Publication US 2022/0278659 A1, Sep. 1, 2022
Int. Cl. H03G 3/30 (2006.01); H03F 1/56 (2006.01); H03F 3/195 (2006.01); H03F 3/24 (2006.01)
CPC H03F 3/245 (2013.01) [H03F 1/565 (2013.01); H03F 3/195 (2013.01); H03F 2200/102 (2013.01); H03F 2200/451 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A radio frequency power amplifier, comprising a power amplifier circuit, an output matching circuit, a power detection circuit, and a bias comparison circuit, wherein the power amplifier circuit is connected to the output matching circuit, an input end of the power detection circuit is connected to a node on a main signal path, an output end of the power detection circuit is connected to an input end of the bias comparison circuit, and an output end of the bias comparison circuit is connected to a bias end and/or a collector end of the power amplifier circuit;
an output power on the main signal path is detected by the power detection circuit, and an equivalent voltage proportional to the output power is obtained; and after the equivalent voltage is inputted to the bias comparison circuit, a value of the equivalent voltage is adjusted according to different bias states required by different bias ends of the power amplifier circuit, to obtain one or more branch equivalent voltages; and
each branch equivalent voltage is separately compared with a control voltage pre-inputted to the bias comparison circuit, and a bias voltage and/or a collector voltage are continuously provided to the power amplifier circuit, until the control voltage corresponds to an output power level of the radio frequency power amplifier.