US 9,813,088 B2
Supply modulators with voltage and frequency partitioning
Deukhyoun Heo, Pullman, WA (US); Zhiyuan Zhou, Pullman, WA (US); and Nghia Tang, Pullman, WA (US)
Assigned to Washington State University, Pullman, WA (US)
Filed by Washington State University, Pullman, WA (US)
Filed on Jul. 30, 2016, as Appl. No. 15/224,513.
Claims priority of provisional application 62/199,917, filed on Jul. 31, 2015.
Prior Publication US 2017/0033811 A1, Feb. 2, 2017
Int. Cl. H04L 25/03 (2006.01); H04B 1/04 (2006.01); H03F 3/21 (2006.01); H03F 1/02 (2006.01); H03F 3/24 (2006.01); H03F 3/19 (2006.01); H03F 3/217 (2006.01)
CPC H04B 1/0475 (2013.01) [H03F 1/0227 (2013.01); H03F 3/19 (2013.01); H03F 3/21 (2013.01); H03F 3/211 (2013.01); H03F 3/2173 (2013.01); H03F 3/245 (2013.01); H03F 2200/102 (2013.01); H03F 2200/348 (2013.01); H03F 2200/351 (2013.01); H03F 2200/432 (2013.01); H03F 2200/451 (2013.01); H03F 2200/555 (2013.01); H04B 2001/045 (2013.01); H04B 2001/0416 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An envelope tracking supply modulator, comprising:
a split-path input configured to receive an envelope signal having an amplitude;
a switching regulator coupled to the split-path input and including:
a pre-amplifier having an input coupled to the envelope signal and another input coupled to a threshold voltage signal; and
a pulse frequency modulator and a pulse width modulator both coupled to the pre-amplifier, wherein the pulse frequency modulator and the pulse width modulator are configured to operate alternately to generate a switched signal based on a comparison result between the envelope signal and the threshold voltage signal at the pre-amplifier;
a digital linear regulator also coupled to the split-path input and configured to generate a linear output signal based on the received envelope signal; and
a summing circuit electrically coupled to the switching regulator and the digital linear regulator and configured to sum the switched signal and the linear output signal to produce a summed signal that generally tracks the amplitude of the envelop signal.