US 12,334,885 B2
Biasing of cascode power amplifiers for multiple operating modes
Bang Li Liang, Ottawa (CA); Guillaume Alexandre Blin, Carlisle, MA (US); and Thomas Obkircher, Santa Ana, CA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Jun. 16, 2022, as Appl. No. 17/807,342.
Claims priority of provisional application 63/203,125, filed on Jul. 9, 2021.
Claims priority of provisional application 63/203,129, filed on Jul. 9, 2021.
Prior Publication US 2023/0012894 A1, Jan. 19, 2023
Int. Cl. H03F 1/22 (2006.01); H03F 1/02 (2006.01); H03F 3/24 (2006.01); H04B 1/40 (2015.01)
CPC H03F 3/245 (2013.01) [H03F 1/02 (2013.01); H04B 1/40 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power amplifier system comprising:
a cascode power amplifier biased by a first cascode bias voltage and configured to amplify a radio frequency input signal, the cascode power amplifier operable in a plurality of modes including a normal power transmit mode, a low power transmit mode, and a sleep mode; and
a bias voltage generation circuit including a first switch, a first cascode transmit mode bias circuit configured to provide the first cascode bias voltage to the cascode power amplifier through the first switch in the normal power transmit mode, a low power mode bias circuit configured to override the first cascode transmit mode bias circuit to set the first cascode bias voltage in the low power transmit mode, a second switch, and a sleep mode bias circuit configured to provide the first cascode bias voltage to the cascode power amplifier through the second switch in the sleep mode.