US 12,088,255 B2
Doherty amplifiers and amplifier modules with shunt inductor and capacitor circuit for improved carrier harmonic loading
Nick Yang, Cincinnati, OH (US); Yu-Ting David Wu, Schaumburg, IL (US); and Joseph Gerard Schultz, Wheaton, IL (US)
Assigned to NXP USA, Inc., Austin, TX (US)
Filed by NXP USA, Inc., Austin, TX (US)
Filed on Jun. 10, 2021, as Appl. No. 17/344,789.
Prior Publication US 2022/0399856 A1, Dec. 15, 2022
Int. Cl. H03F 3/45 (2006.01); H03F 1/02 (2006.01); H03F 3/21 (2006.01)
CPC H03F 1/0288 (2013.01) [H03F 3/211 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An amplifier module comprising:
a substrate with a mounting surface;
a first power transistor die coupled to the mounting surface, wherein the first power transistor die includes a first transistor integrated within the first power transistor die, and wherein the first transistor includes a first drain terminal and a first intrinsic drain node corresponding to the first drain terminal;
a second power transistor die coupled to the mounting surface, wherein the second power transistor die includes a second transistor integrated within the second power transistor die, and wherein the second transistor includes a second drain terminal and a second intrinsic drain node corresponding to the second drain terminal;
a phase shift and impedance inversion element connected between the first drain terminal and the second drain terminal;
a first shunt inductance circuit coupled to the second drain terminal; and
a harmonic control circuit coupled to the second drain terminal, wherein the harmonic control circuit includes an inductor and a capacitor and the inductor and the capacitor are connected in series to the second drain terminal, wherein a first terminal of the inductor is coupled to the first drain terminal and a second terminal of the inductor is coupled to a first terminal of the capacitor.