US 12,081,181 B2
Variable-gain amplifiers with configurable baluns
Hanseung Lee, Thousand Oaks, CA (US); Dongjin Jung, Thousand Oaks, CA (US); and Weimin Sun, Santa Rosa Valley, CA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by SKYWORKS SOLUTIONS, INC., Irvine, CA (US)
Filed on May 10, 2023, as Appl. No. 18/315,257.
Application 18/315,257 is a continuation of application No. 17/114,394, filed on Dec. 7, 2020, granted, now 11,652,453.
Claims priority of provisional application 62/945,407, filed on Dec. 9, 2019.
Prior Publication US 2023/0275548 A1, Aug. 31, 2023
Int. Cl. H03F 3/24 (2006.01); H03F 1/02 (2006.01); H03F 3/195 (2006.01); H03F 3/72 (2006.01)
CPC H03F 3/245 (2013.01) [H03F 1/0288 (2013.01); H03F 3/195 (2013.01); H03F 3/72 (2013.01); H03F 2200/09 (2013.01); H03F 2200/451 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A variable-gain amplification system comprising:
an amplifier configured to provide an amplified signal and to selectively operate in at least a first gain mode and a second gain mode; and
a tunable circuit including a first coil configured to receive the amplified signal from the amplifier, a second coil configured to provide an output signal, and a first switch coupled between a first portion of the second coil and a second portion of the second coil, the second portion of the second coil including a first end that is coupled to the first switch and a second end that is coupled to a ground, the tunable circuit being configurable to a first turn ratio for the first gain mode and a second turn ratio for the second gain mode.