US 12,445,099 B2
Bias circuit of power amplifier, device and equipment
Zhenfei Peng, Guangzhou (CN); Qiang Su, Guangzhou (CN); and Xuwen Ni, Guangzhou (CN)
Assigned to SMARTER MICROELECTRONICS (GUANG ZHOU) CO., LTD., Guangzhou (CN)
Filed by SMARTER MICROELECTRONICS (GUANG ZHOU) CO., LTD., Guangzhou (CN)
Filed on Sep. 4, 2022, as Appl. No. 17/929,710.
Application 17/929,710 is a continuation of application No. PCT/CN2021/132876, filed on Nov. 24, 2021.
Claims priority of application No. 202110182211.1 (CN), filed on Feb. 9, 2021.
Prior Publication US 2023/0006623 A1, Jan. 5, 2023
Int. Cl. H03F 1/56 (2006.01); H03F 3/193 (2006.01); H03F 3/24 (2006.01)
CPC H03F 3/245 (2013.01) [H03F 1/56 (2013.01); H03F 3/193 (2013.01); H03F 2200/18 (2013.01); H03F 2200/451 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A bias circuit of a power amplifier, comprising a first part circuit, a second part circuit, and a power supply, wherein
the power supply is connected with a power supply end of the first part circuit and configured to supply power to the first part circuit;
two ends of the first part circuit are connected in parallel with two ends of the second part circuit, one end of the parallel connection is connected with a gate of a first transistor of the power amplifier in a signal amplification circuit, the first part circuit is configured to provide a first bias voltage to the gate of the first transistor, the second part circuit is configured to provide a second bias voltage to the gate of the first transistor, and the first bias voltage and the second bias voltage are superimposed to provide a stable bias voltage to the gate of the first transistor; and
an impedance of the bias circuit is in a preset impedance range;
wherein
the first part circuit comprises a second transistor, a third transistor, a first resistor, a second resistor, and a first capacitor
a drain of the second transistor is connected with the power supply, and the drain and a gate of the second transistor are connected to each other; a source of the second transistor is connected with one end of the second part circuit; the gate of the second transistor is connected to a gate of the third transistor through the first resistor, and is also connected to a ground terminal through the first capacitor;
a drain of the third transistor is connected with the power supply, and a source of the third transistor is connected with another end of the second part circuit and also connected with the gate of the first transistor;
the second resistor is a variable resistor; and
the first capacitor is connected with the ground terminal through the second resistor.