US 12,451,920 B2
Apparatus and methods for power amplifier signal limiting
Philip John Lehtola, Cedar Rapids, IA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Apr. 30, 2024, as Appl. No. 18/650,684.
Application 18/650,684 is a continuation of application No. 17/663,067, filed on May 12, 2022, granted, now 12,003,268.
Claims priority of provisional application 63/202,141, filed on May 28, 2021.
Prior Publication US 2024/0291513 A1, Aug. 29, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 1/40 (2015.01); H03F 1/52 (2006.01); H03F 3/24 (2006.01)
CPC H04B 1/40 (2013.01) [H03F 1/52 (2013.01); H03F 3/245 (2013.01); H03F 2200/171 (2013.01); H03F 2200/426 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A mobile device comprising:
a transceiver configured to generate a radio frequency transmit signal; and
a front-end system including a low noise amplifier configured to amplify a radio frequency receive signal during a receive frame, a power amplifier configured to amplify the radio frequency transmit signal during a transmit frame, and a signal limiter operable to limit a signal power of the power amplifier in an attenuating mode, the power amplifier biased by a bias signal that is activated during the transmit frame and deactivated during the receive frame, the signal limiter including a radio frequency detector configured to generate a detection signal based on detecting a power level of the radio frequency transmit signal, and a latch configured to lock the signal limiter in the attenuating mode in response to activation of the detection signal, the latch configured to be reset by the bias signal.