US 12,249,965 B2
Front-end circuitry with amplifier protection
Marco Cassia, San Diego, CA (US); and Jose Cabanillas, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Jun. 21, 2022, as Appl. No. 17/808,040.
Prior Publication US 2023/0412130 A1, Dec. 21, 2023
Int. Cl. H03F 1/52 (2006.01); H03F 1/56 (2006.01); H03F 3/195 (2006.01); H03F 3/24 (2006.01); H04B 1/04 (2006.01)
CPC H03F 3/245 (2013.01) [H03F 1/52 (2013.01); H03F 1/56 (2013.01); H03F 3/195 (2013.01); H04B 1/0458 (2013.01); H03F 2200/451 (2013.01); H03F 2200/471 (2013.01); H04B 2001/0408 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radio frequency front-end circuit comprising:
a power amplifier configured to amplify an input signal with a gain;
a first sensor coupled to a first node coupled to an input of the power amplifier and configured to sense at least one of a first power or a first voltage of the first node;
a second sensor coupled to a second node coupled to an output of the power amplifier and configured to sense at least one of a second power or a second voltage of the second node; and
logic coupled to the first sensor and the second sensor and configured to:
determine that the at least one of the second power or the second voltage is outside a range based on the gain and the at least one of the first power or the first voltage; and
take an action to protect the power amplifier based on the determination, wherein in taking the action, the logic is configured to control lowering a power supply voltage for the power amplifier.