US 9,813,089 B2
Digital predistortion linearization for power amplifiers
Timothy J. Talty, Beverly Hills, MI (US); Emilio A. Sovero, Thousand Oaks, CA (US); Mohiuddin Ahmed, Moorpark, CA (US); Cynthia D. Baringer, Piedmont, CA (US); James Chingwei Li, Simi Valley, CA (US); Yen-Cheng Kuan, Los Angeles, CA (US); and Hsuanyu Pan, Los Angeles, CA (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Feb. 15, 2017, as Appl. No. 15/433,964.
Application 15/433,964 is a continuation in part of application No. 15/103,256, previously published as PCT/US2015/059583, filed on Nov. 6, 2015.
Claims priority of provisional application 62/076,324, filed on Nov. 6, 2014.
Prior Publication US 2017/0187401 A1, Jun. 29, 2017
Int. Cl. H04B 1/04 (2006.01)
CPC H04B 1/0475 (2013.01) [H04B 2001/0425 (2013.01)] 20 Claims
OG exemplary drawing
1. An RF transmitter module, said transmitter module comprising:
a digital signal processor (DSP) providing a digital signal to be transmitted;
a digital-to-analog converter (DAC) responsive to the digital signal from the DSP and a clock signal from a clock circuit, said DAC converting the digital signal to an analog signal;
a tunable bandpass filter responsive to the analog signal from the DAC and removing frequencies in the analog signal outside of a frequency band of interest; and
a power amplifier responsive to the filtered analog signal from the bandpass filter and amplifying the filtered analog signal, wherein the DSP employs a noise-shaping operation to shape the analog signal from the DAC to remove quantization noise in an immediate vicinity of the analog signal so as to improve signal-to-noise ratio.