US 11,990,871 B2
Inverted Doherty power amplifier with large RF fractional and instantaneous bandwidths
Gerard Bouisse, Toulouse (FR); and Christian Cassou, Tournefeuille (FR)
Assigned to MACOM TECHNOLOGY SOLUTIONS HOLDINGS, INC., Lowell, MA (US)
Filed by MACOM Technology Solutions Holdings, Inc., Lowell, MA (US)
Filed on Oct. 18, 2021, as Appl. No. 17/503,939.
Application 17/503,939 is a continuation of application No. 16/607,083, granted, now 11,159,125, previously published as PCT/IB2017/000604, filed on Apr. 24, 2017.
Prior Publication US 2022/0038058 A1, Feb. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H03F 1/02 (2006.01); H03F 1/56 (2006.01); H03F 3/21 (2006.01)
CPC H03F 1/0288 (2013.01) [H03F 1/565 (2013.01); H03F 3/211 (2013.01); H03F 2200/222 (2013.01); H03F 2200/387 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An inverted Doherty amplifier comprising:
a main amplifier in a first circuit branch;
a peaking amplifier in a second circuit branch;
a combining node located where a first portion of the first circuit branch after the main amplifier connects with a second portion of the second circuit branch after the peaking amplifier;
a first impedance-matching component connected in the first portion of the first circuit branch between the main amplifier and the combining node, the first impedance-matching component comprising an output impedance of Rcomb; and
an impedance inverter connected in the second portion of the second circuit branch between the peaking amplifier and the combining node, the impedance inverter comprising an impedance value of Rcomb/α, wherein:
α is an asymmetry factor for the inverted Doherty amplifier,
the asymmetry factor is a ratio of a maximum power output by the peaking amplifier to a maximum power output by the main amplifier, and
the impedance inverter adds a phase delay of approximately 270 degrees.