US 11,757,475 B2
Low-complexity inverse sinc for RF sampling transmitters
Jaiganesh Balakrishnan, Bangalore (IN); Sriram Murali, Bangalore (IN); Sundarrajan Rangachari, Trichy (IN); and Yeswanth Guntupalli, Guntur (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Oct. 4, 2021, as Appl. No. 17/492,710.
Application 17/492,710 is a continuation of application No. 17/022,871, filed on Sep. 16, 2020, granted, now 11,171,674.
Claims priority of application No. 201941037591 (IN), filed on Sep. 18, 2019.
Prior Publication US 2022/0029644 A1, Jan. 27, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 1/10 (2006.01); H04B 1/00 (2006.01)
CPC H04B 1/0025 (2013.01) [H04B 1/001 (2013.01); H04B 1/0042 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a first-stage up-sampler having a first-stage up-sampling factor M;
a digital-to-analog converter (DAC) response compensator coupled to an output of the first-stage up-sampler;
a second-stage up-sampler coupled to an output of the DAC response compensator and having a second-stage up-sampling factor N/M, wherein N and M are positive integers;
a digital up-conversion mixer coupled to an output of the second-stage up-sampler; and
an RF sampling DAC coupled to an output of the digital up-conversion mixer the RF sampling DAC generating an analog output signal.