US 11,817,830 B2
Two-stage LNA with mutual coupling
Rong Jiang, San Diego, CA (US); and Khushali Shah, San Diego, CA (US)
Assigned to pSemi Corporation, San Diego, CA (US)
Filed by pSemi Corporation, San Diego, CA (US)
Filed on May 24, 2022, as Appl. No. 17/752,440.
Application 17/752,440 is a continuation of application No. 16/928,549, filed on Jul. 14, 2020, granted, now 11,356,068.
Prior Publication US 2022/0360235 A1, Nov. 10, 2022
Int. Cl. H03F 1/22 (2006.01); H03F 3/193 (2006.01); H03F 1/56 (2006.01)
CPC H03F 3/193 (2013.01) [H03F 1/56 (2013.01); H03F 2200/222 (2013.01); H03F 2200/294 (2013.01); H03F 2200/372 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An amplifier, including:
(a) a first amplifier stage having an input configured to receive a radio frequency (RF) input signal, and an output for an amplified RF signal;
(b) a second amplifier stage having an input configured to receive the amplified RF signal from the first amplifier stage, and an output for a further amplified RF signal;
(c) a mutually-coupled inductor circuit coupled to the output of the first amplifier stage to the output of the second amplifier stage, and configured to be coupled to at least one supply voltage, the mutually-coupled inductor circuit including:
(1) a first inductor coupled to the output of the first amplifier; and
(2) a second inductor coupled to the output of the second amplifier stage;
wherein a mutual coupling factor K exists between the first inductor and the second inductor of the mutually-coupled inductor circuit.