US 12,170,506 B2
LNA architecture with configurable feedback filtering
Emre Ayranci, Costa Mesa, CA (US); Mengsheng Rui, San Diego, CA (US); Miles Sanner, San Diego, CA (US); and Anant Rungta, San Diego, CA (US)
Assigned to Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Dec. 28, 2022, as Appl. No. 18/147,607.
Prior Publication US 2024/0223131 A1, Jul. 4, 2024
Int. Cl. H03F 1/26 (2006.01); H03F 3/195 (2006.01); H03F 3/72 (2006.01)
CPC H03F 1/26 (2013.01) [H03F 3/195 (2013.01); H03F 3/72 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A low noise amplifier (LNA) circuit, comprising:
a first amplification stage configured to receive an input radio frequency (RF) signal at an input of the first amplification stage and generate therefrom an amplified RF signal at an output of the first amplification stage; and
a filter circuit comprising an L-C tank, the filter circuit coupled between the output and the input of the first amplification stage,
wherein:
the L-C tank is configured to resonate at a resonant frequency to provide a narrowband frequency response of the LNA circuit; and
the L-C tank includes at least one tunable inductor or capacitor configured to tune the resonant frequency.