US 11,973,468 B2
Apparatus and methods for envelope tracking
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 Jun. 27, 2023, as Appl. No. 18/342,122.
Application 18/342,122 is a continuation of application No. 17/664,820, filed on May 24, 2022, granted, now 11,728,775.
Application 17/664,820 is a continuation of application No. 16/837,319, filed on Apr. 1, 2020, granted, now 11,374,538, issued on Jun. 28, 2022.
Claims priority of provisional application 62/831,304, filed on Apr. 9, 2019.
Prior Publication US 2023/0344387 A1, Oct. 26, 2023
Int. Cl. H03F 1/02 (2006.01); H03F 3/19 (2006.01); H03F 3/21 (2006.01); H04B 1/3827 (2015.01); H04B 1/40 (2015.01)
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. A mobile device comprising:
a transceiver configured to generate a radio frequency transmit signal;
a front end circuit including a power amplifier configured to amplify the radio frequency transmit signal; and
an envelope tracker configured to generate a power amplifier supply voltage that powers the power amplifier, the envelope tracker including a first series inductor, a DC-to-DC converter having an output connected to the power amplifier supply voltage through the first series inductor, a second series inductor, a series capacitor in series with the second series inductor, a modulator having a plurality of inputs configured to receive a plurality of regulated voltages and an output connected to the power amplifier supply voltage through the series capacitor and the second series inductor, and a control circuit configured to control the modulator based on an envelope signal indicating an envelope of the radio frequency transmit signal.