US 12,249,963 B2
Method for enhancing power amplifier efficiency and linearity and power amplifier
Seyed Bagher Rabet, La Jolla, CA (US); and Peter M. Asbeck, Del Mar, CA (US)
Assigned to The Regents of the University of California, Oakland, CA (US)
Appl. No. 17/628,083
Filed by The Regents of the University of California, Oakland, CA (US)
PCT Filed Jul. 29, 2020, PCT No. PCT/US2020/044073
§ 371(c)(1), (2) Date Jan. 18, 2022,
PCT Pub. No. WO2021/021934, PCT Pub. Date Feb. 4, 2021.
Claims priority of provisional application 62/880,320, filed on Jul. 30, 2019.
Prior Publication US 2022/0263475 A1, Aug. 18, 2022
Int. Cl. H03F 1/07 (2006.01); H03F 1/02 (2006.01); H03F 1/32 (2006.01); H03F 1/56 (2006.01); H03F 3/24 (2006.01)
CPC H03F 1/0288 (2013.01) [H03F 1/32 (2013.01); H03F 1/56 (2013.01); H03F 3/245 (2013.01); H03F 2200/451 (2013.01)] 15 Claims
OG exemplary drawing
 
13. A power amplifier, comprising:
an input;
a split to apply an input signal from the input to a main amplifier and an auxiliary amplifier;
a passive input network before the input of one of the main and the auxiliary amplifiers to provide a phase shift; wherein the main and auxiliary amplifiers and the output combiner are configured such that at low power levels the auxiliary amplifier is off and the main amplifier sees a large impedance;
at maximum power level both the auxiliary and main amplifiers operate at full power and there is a constant phase shift between them; and
while transitioning from low to maximum power, the systematic AM-AM and AM-PM variations generated by the input phase shift and a load-pulling operation between the main and auxiliary amplifiers via the output combiner combiner compensate for device related distortions that arise from varying voltage swings in transistors of the main and auxiliary amplifiers.