US 9,813,029 B2
Differential amplifier linearization in a radio frequency system
Yu Zhu, Wellesley, MA (US); Dylan Charles Bartle, Arlington, MA (US); Oleksiy Klimashov, Burlington, MA (US); and Paul T. DiCarlo, Marlborough, MA (US)
Assigned to Skyworks Solutions, Inc., Woburn, MA (US)
Filed by Skyworks Solutions, Inc., Woburn, MA (US)
Filed on Jun. 24, 2016, as Appl. No. 15/191,938.
Claims priority of provisional application 62/235,054, filed on Sep. 30, 2015.
Claims priority of provisional application 62/187,018, filed on Jun. 30, 2015.
Prior Publication US 2017/0005623 A1, Jan. 5, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 1/04 (2006.01); H03F 3/45 (2006.01); H03F 1/32 (2006.01); H03F 3/24 (2006.01); H03F 3/193 (2006.01); H03F 3/19 (2006.01); H04B 1/48 (2006.01); H04B 1/40 (2015.01); H04B 1/3827 (2015.01); H04B 1/525 (2015.01); H03F 1/02 (2006.01); H03F 3/195 (2006.01); H03F 3/21 (2006.01); H04W 88/02 (2009.01)
CPC H03F 1/3205 (2013.01) [H03F 1/0266 (2013.01); H03F 1/32 (2013.01); H03F 3/19 (2013.01); H03F 3/193 (2013.01); H03F 3/195 (2013.01); H03F 3/211 (2013.01); H03F 3/245 (2013.01); H03F 3/4508 (2013.01); H03F 3/45179 (2013.01); H04B 1/3827 (2013.01); H04B 1/40 (2013.01); H04B 1/48 (2013.01); H04B 1/525 (2013.01); H03F 2200/102 (2013.01); H03F 2200/105 (2013.01); H03F 2200/15 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01); H03F 2201/3215 (2013.01); H03F 2201/3236 (2013.01); H04B 2001/485 (2013.01); H04W 88/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method to improve amplifier linearity for a differential amplifier, the method comprising:
receiving at an input terminal of a differential amplifier a first signal including signal components having a first frequency and signal components having a second frequency, the differential amplifier including at least a first amplifier circuit and a second amplifier circuit;
generating a second signal having a third frequency approximately equal to a difference between the first frequency and the second frequency;
adjusting an amplitude of the second signal based at least in part on a power level of the first signal; and
applying the second signal to the first amplifier circuit and not to the second amplifier circuit to cancel at least a portion of intermodulation components in a third signal being output from the differential amplifier.