US 11,677,357 B2
Envelope tracking system with modeling of a power amplifier supply voltage filter
Serge Francois Drogi, Flagstaff, AZ (US); Florinel G. Balteanu, Irvine, CA (US); and Shayan Farahvash, Kensington, CA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on May 18, 2021, as Appl. No. 17/302,993.
Application 17/302,993 is a continuation of application No. 16/678,696, filed on Nov. 8, 2019, granted, now 11,038,471.
Claims priority of provisional application 62/769,982, filed on Nov. 20, 2018.
Prior Publication US 2021/0273614 A1, Sep. 2, 2021
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); G06F 30/367 (2020.01); G06F 119/06 (2020.01); G06F 119/10 (2020.01)
CPC H03F 1/304 (2013.01) [G06F 30/367 (2020.01); H03F 1/0227 (2013.01); H03F 3/195 (2013.01); H03F 3/245 (2013.01); G06F 2119/06 (2020.01); G06F 2119/10 (2020.01); H03F 2200/102 (2013.01); H03F 2200/504 (2013.01); H03F 2201/3227 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An envelope tracking system comprising:
a modulator configured to generate a radio frequency signal based on a digital transmit signal, the radio frequency signal having a signal envelope;
a supply voltage filter configured to filter a power amplifier supply voltage having a voltage level that changes in relation to the signal envelope;
a power amplifier configured to amplify the radio frequency signal, and to receive power from the power amplifier supply voltage;
a shaping circuit configured to generate shaped envelope data based on a digital representation of the signal envelope; and
a digital modeling circuit operable to receive the shaped envelope data, and to compensate the digital transmit signal for distortion arising from the supply voltage filter.