US 12,224,725 B2
Lookup table calibration apparatus and method
Nadim Khlat, Cugnaux (FR)
Assigned to Qorvo US, Inc., Greensboro, NC (US)
Filed by Qorvo US, Inc., Greensboro, NC (US)
Filed on Dec. 16, 2021, as Appl. No. 17/552,791.
Claims priority of provisional application 63/188,023, filed on May 13, 2021.
Claims priority of provisional application 63/188,034, filed on May 13, 2021.
Prior Publication US 2022/0368300 A1, Nov. 17, 2022
Int. Cl. H03G 3/30 (2006.01); H03F 3/24 (2006.01); H03H 11/16 (2006.01)
CPC H03G 3/3042 (2013.01) [H03F 3/245 (2013.01); H03H 11/16 (2013.01); H03F 2200/451 (2013.01); H03G 2201/103 (2013.01); H03G 2201/307 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A lookup table calibration apparatus comprising:
a power amplifier circuit comprising:
a phase shifter circuit configured to phase-shift a radio frequency (RF) signal based on a modulated phase correction voltage generated based on a phase correction voltage lookup table comprising a plurality of power indexes each correlating a respective power level of the RF signal with a respective one of a plurality of phase correction voltage targets; and
a power amplifier configured to amplify the phase-shifted RF signal based on a modulated voltage generated based on a modulated voltage lookup table comprising the plurality of power indexes each correlating the respective power level of the RF signal with a respective one of a plurality of modulated voltage targets; and
a calibration control circuit configured to, for each of the plurality of power indexes:
adjust the modulated voltage until a measured gain of the amplified RF signal equals a reference gain;
update the respective one of the plurality of modulated voltage targets in the modulated voltage lookup table based on the adjusted modulated voltage;
adjust the modulated phase correction voltage until a measured phase of the amplified RF signal equals a reference phase; and
update the respective one of the plurality of phase correction voltage targets in the phase correction voltage lookup table based on the adjusted modulated phase correction voltage.