US 12,414,056 B2
Automatic gain control system, control method, power detector and radio frequency receiver
Ga Liu, Beijing (CN); Yanhui Li, Beijing (CN); Yuan Gao, Beijing (CN); and Sujiang Rong, Beijing (CN)
Assigned to Beijing ESWIN Computing Technology Co., Ltd., Beijing (CN); and Guangzhou Transa Semi Information Technology Co., Ltd., Guangzhou (CN)
Filed by Beijing ESWIN Computing Technology Co., Ltd., Beijing (CN); and Guangzhou Transa Semi Information Technology Co., Ltd., Guangzhou (CN)
Filed on Feb. 10, 2023, as Appl. No. 18/167,145.
Claims priority of application No. 202210185341.5 (CN), filed on Feb. 28, 2022.
Prior Publication US 2023/0276380 A1, Aug. 31, 2023
Int. Cl. H03F 3/24 (2006.01); G01R 21/10 (2006.01); H03F 1/02 (2006.01); H03G 3/30 (2006.01); H04W 52/52 (2009.01)
CPC H04W 52/52 (2013.01) [H03F 3/24 (2013.01); H03G 3/3042 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A power detector for an automatic gain control system, wherein the power detector is configured to detect an output power of a trans-impedance amplifier and adjust, by a control logic unit, a gain or an output power of a low noise amplifier connected to a radio frequency signal, the power detector comprises:
a detection circuit, which has a first input terminal connected to a first differential output terminal of the trans-impedance amplifier and a second input terminal connected to a second differential output terminal of the trans-impedance amplifier, and is configured to sample a peak of a differential output signal of the trans-impedance amplifier along with a clock cycle and provide a differential detection signal at a first output node; and
a filter circuit, which is connected to the detector circuit, and is configured to convert energy of the differential detection signal obtained at the first output node into an output voltage.