US 11,942,899 B2
Envelope tracking voltage correction in a transmission circuit
Nadim Khlat, Cugnaux (FR); and James M. Retz, Cedar Rapids, IA (US)
Assigned to Qorvo US, Inc., Greensboro, NC (US)
Filed by Qorvo US, Inc., Greensboro, NC (US)
Filed on Mar. 22, 2022, as Appl. No. 17/700,700.
Claims priority of provisional application 63/245,145, filed on Sep. 16, 2021.
Claims priority of provisional application 63/212,418, filed on Jun. 18, 2021.
Prior Publication US 2022/0407464 A1, Dec. 22, 2022
Int. Cl. H03F 1/02 (2006.01); H03F 3/24 (2006.01); H04B 1/40 (2015.01)
CPC H03F 1/0233 (2013.01) [H03F 3/245 (2013.01); H04B 1/40 (2013.01); H03F 2200/105 (2013.01); H03F 2200/451 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A transmission circuit comprising:
a power amplifier circuit coupled to a transmitter circuit via a radio frequency (RF) front-end circuit and configured to amplify an RF signal based on a modulated voltage and provide the amplified RF signal to the RF front-end circuit;
an envelope tracking (ET) integrated circuit (ETIC) configured to generate the modulated voltage based on a modulated target voltage; and
a transceiver circuit configured to:
generate the RF signal from a time-variant modulation vector;
generate the modulated target voltage as a function of the time-variant modulation vector; and
apply at least one complex filter to at least the RF signal to compensate for a voltage distortion filter created on an output stage of the power amplifier circuit by coupling the power amplifier circuit with the RF front-end circuit across a modulation bandwidth.