US 11,973,467 B2
Multi-level envelope tracking with analog interface
Florinel G. Balteanu, Irvine, CA (US); Serge Francois Drogi, Flagstaff, AZ (US); Shayan Farahvash, Kensington, 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 Apr. 14, 2023, as Appl. No. 18/300,726.
Application 18/300,726 is a continuation of application No. 17/456,955, filed on Nov. 30, 2021, granted, now 11,658,615.
Application 17/456,955 is a continuation of application No. 16/948,543, filed on Sep. 23, 2020, granted, now 11,223,324, issued on Jan. 11, 2022.
Claims priority of provisional application 62/906,940, filed on Sep. 27, 2019.
Prior Publication US 2023/0291356 A1, Sep. 14, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H03F 1/30 (2006.01); H03F 1/02 (2006.01); H03F 3/195 (2006.01); H03F 3/24 (2006.01)
CPC H03F 1/0227 (2013.01) [H03F 3/195 (2013.01); H03F 3/245 (2013.01); H03F 2200/102 (2013.01); H03F 2200/168 (2013.01); H03F 2200/336 (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 signal and to receive power from a power amplifier supply voltage; and
an envelope tracker configured to generate the power amplifier supply voltage at an envelope tracker output based on an analog envelope signal corresponding to an envelope of the radio frequency signal, the envelope tracker including a plurality of modulators each receiving a plurality of regulated voltages, a plurality of modulator output filters each coupled between the envelope tracker output and a corresponding one of the plurality of modulators, and a modulator control circuit configured to control the plurality of modulators based on the analog envelope signal.