US 11,728,775 B2
Envelope tracking for multiple power amplifiers
Serge Francois Drogi, Flagstaff, AZ (US); Florinel G. Balteanu, Irvine, CA (US); and David Richard Pehlke, Westlake Village, CA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on May 24, 2022, as Appl. No. 17/664,820.
Application 17/664,820 is a continuation of application No. 16/837,319, filed on Apr. 1, 2020, granted, now 11,374,538.
Claims priority of provisional application 62/831,304, filed on Apr. 9, 2019.
Prior Publication US 2022/0286093 A1, Sep. 8, 2022
Int. Cl. H03F 1/02 (2006.01); H03F 3/21 (2006.01); H04B 1/3827 (2015.01); H04B 1/40 (2015.01); H03F 3/19 (2006.01)
CPC H03F 1/0227 (2013.01) [H03F 3/19 (2013.01); H03F 3/21 (2013.01); H04B 1/3838 (2013.01); H04B 1/40 (2013.01); H03F 2200/102 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An envelope tracking system comprising:
a first power amplifier configured to amplify a first radio frequency signal and to receive power from a first supply voltage;
a second power amplifier configured to amplify a second radio frequency signal and to receive power from a second supply voltage; and
an envelope tracker including a first modulator configured to generate a first output current based on an envelope of the first radio frequency signal and a plurality of regulated voltages of different voltage levels, a second modulator configured to generate a second output current based on an envelope of the second radio frequency signal and the plurality of regulated voltages, a multi-output DC-to-DC converter configured to generate a first DC voltage and a second DC voltage, a first combiner configured to combine the first DC voltage with the first output current to generate the first supply voltage, and a second combiner configured to combine the second DC voltage with the second output current to generate the second supply voltage.