US 11,671,136 B2
Biasing of cascode power amplifiers for multiple power supply domains
Bang Li Liang, Ottawa (CA); Thomas Obkircher, Santa Ana, CA (US); and Guillaume Alexandre Blin, Carlisle, MA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Mar. 22, 2022, as Appl. No. 17/655,911.
Application 17/655,911 is a continuation of application No. 17/247,889, filed on Dec. 29, 2020, granted, now 11,316,550.
Claims priority of provisional application 62/961,553, filed on Jan. 15, 2020.
Prior Publication US 2022/0278707 A1, Sep. 1, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 1/40 (2015.01); H03F 1/02 (2006.01); H03F 3/24 (2006.01)
CPC H04B 1/40 (2013.01) [H03F 1/0216 (2013.01); H03F 3/245 (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 input signal; and
a front end system including a cascode power amplifier configured to receive power from a power amplifier supply voltage and to amplify the radio frequency input signal, and a bias circuit configured to bias the cascode power amplifier with a first cascode bias voltage, the bias circuit including a bandgap reference circuit configured to generate a bandgap reference voltage, a bias voltage generator configured to receive power from the power amplifier supply voltage and to generate a plurality of selectable bias voltages based on the bandgap reference voltage, and a bias voltage selector configured to choose the first cascode bias voltage from amongst the plurality of selectable bias voltages.