US 12,170,505 B2
Apparatus and methods for envelope tracking
Florinel G. Balteanu, Irvine, CA (US); Serge Francois Drogi, Flagstaff, AZ (US); Sabah Khesbak, Irvine, CA (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 Aug. 31, 2023, as Appl. No. 18/240,931.
Application 18/240,931 is a continuation of application No. 18/158,042, filed on Jan. 23, 2023, granted, now 11,770,104.
Application 18/158,042 is a continuation of application No. 17/247,707, filed on Dec. 21, 2020, granted, now 11,595,005, issued on Feb. 28, 2023.
Claims priority of provisional application 62/959,476, filed on Jan. 10, 2020.
Prior Publication US 2023/0412126 A1, Dec. 21, 2023
Int. Cl. H03F 1/02 (2006.01); H03F 3/24 (2006.01); H04B 1/3827 (2015.01); H04B 1/40 (2015.01)
CPC H03F 1/0216 (2013.01) [H03F 3/245 (2013.01); H04B 1/3827 (2013.01); H04B 1/40 (2013.01); H03F 2200/105 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A mobile device comprising:
a front end circuit including a power amplifier configured to amplify a radio frequency signal and to receive power from a power amplifier supply voltage; and
a power management circuit including an envelope tracker configured to control the power amplifier supply voltage based on an envelope signal indicating an envelope of the radio frequency signal, the envelope tracker including a first controllable resistance between a first regulated voltage and the power amplifier supply voltage and a second controllable resistance between a second regulated voltage and the power amplifier supply voltage, the first regulated voltage and the second regulated voltage of different voltage levels, the first controllable resistance including a first plurality of selectable paths each having a different resistance, the first plurality of selectable paths each including a resistor and a switch.