US 11,705,876 B2
Envelope tracking systems for 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 Jul. 29, 2022, as Appl. No. 17/816,165.
Application 17/816,165 is a continuation of application No. 17/138,286, filed on Dec. 30, 2020, granted, now 11,476,815.
Application 17/138,286 is a continuation of application No. 16/811,299, filed on Mar. 6, 2020, granted, now 11,387,797, issued on Jul. 12, 2022.
Claims priority of provisional application 62/831,324, filed on Apr. 9, 2019.
Claims priority of provisional application 62/819,177, filed on Mar. 15, 2019.
Prior Publication US 2022/0393657 A1, Dec. 8, 2022
Int. Cl. H03F 3/24 (2006.01); H04W 52/52 (2009.01); H04B 1/40 (2015.01)
CPC H03F 3/245 (2013.01) [H04B 1/40 (2013.01); H04W 52/52 (2013.01); H03F 2200/105 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An envelope tracking system comprising:
a power amplifier configured to amplify a radio frequency transmit signal, the power amplifier powered by a power amplifier supply voltage; and
an envelope tracker configured to generate the power amplifier supply voltage based on an envelope signal indicating an envelope of the radio frequency transmit signal, the envelope tracker including an amplifier input stage configured to generate a control current and a sense current based on the envelope signal, an amplifier output stage configured to adjust the power amplifier supply voltage based on the control current, and a modulator configured to adjust a supply voltage of the amplifier output stage based on the sense current.