	US 11,750,151 B2
	Apparatus and methods for biasing of power amplifiers
Kunal Datta, San Jose, CA (US); Khaled A. Fayed, Marion, IA (US); Edward James Anthony, Robins, CA (US); Srivatsan Jayaraman, Santa Clara, CA (US); and Jinghang Feng, Santa Clara, CA (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Jun. 14, 2021, as Appl. No. 17/347,039.
Application 17/347,039 is a continuation of application No. 16/738,654, filed on Jan. 9, 2020, granted, now 11,070,171.
Claims priority of provisional application 62/790,643, filed on Jan. 10, 2019.
Prior Publication US 2022/0006426 A1, Jan. 6, 2022
Int. Cl. H03F 1/02 (2006.01); H03F 3/24 (2006.01); H03F 1/56 (2006.01); H03F 3/04 (2006.01); H01L 23/66 (2006.01); H04B 1/40 (2015.01); H04W 52/52 (2009.01)

CPC H03F 1/0211 (2013.01) [H03F 1/56 (2013.01); H03F 3/245 (2013.01); H04B 1/40 (2013.01); H04W 52/52 (2013.01); H03F 2200/102 (2013.01); H03F 2200/222 (2013.01); H03F 2200/318 (2013.01); H03F 2200/387 (2013.01); H03F 2200/451 (2013.01)]

20 Claims

1. A front end system including a power amplifier configured to receive a radio frequency input signal with a plurality of power amplifier transistors that are connected in parallel with one another, and a bias network that biases the plurality of power amplifier transistors with at least one resistor and at least one capacitor, both the at least one resistor and the at least one capacitor connected in parallel between a DC bias voltage and the radio frequency input signal, an output of the at least one resistor and an output of the at least one capacitor, the radio frequency input signal in communication with a base of at least one of the plurality of power amplifier transistors, and the bias network has a reactance that is operable to track an intrinsic input capacitance of the plurality of power amplifier transistors.