US 12,224,716 B2
Power amplifier having analog pre-distortion by adaptive degenerative feedback
Aleksey A. Lyalin, Moorpark, CA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by SKYWORKS SOLUTIONS, INC., Irvine, CA (US)
Filed on Dec. 27, 2021, as Appl. No. 17/562,249.
Claims priority of provisional application 63/132,419, filed on Dec. 30, 2020.
Prior Publication US 2022/0231640 A1, Jul. 21, 2022
Int. Cl. H03F 1/32 (2006.01); H03F 3/24 (2006.01); H04B 1/04 (2006.01)
CPC H03F 1/3241 (2013.01) [H03F 3/245 (2013.01); H03F 2200/451 (2013.01); H04B 2001/0425 (2013.01); H04B 1/0475 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A pre-distortion circuit for an amplifier, comprising:
a transistor having an input node for receiving an input signal, an output node for providing an output signal having a gain relative to the input signal, and a common node for coupling to a ground; and
a degeneration circuit implemented between the common node and the ground, the degeneration circuit configured to introduce a feedback response that reduces the gain when the input signal has a power level at or below a selected level, the degeneration circuit further configured to be disabled or provide a reduced feedback response when the input signal has a power level that exceeds the selected level, the degeneration circuit including a resistance implemented between the common node and the ground, and an antiparallel combination of first and second diodes implemented between the common node and the ground, the first and second diodes configured to turn on when the power level of the input signal exceeds the selected level.