US 12,244,319 B2
Charge pump spur correction
Karthikeyan Gunasekaran, Bangalore (IN); and Jagannathan Venkataraman, Bangalore (IN)
Assigned to Texas Instruments Incorporated, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Oct. 31, 2022, as Appl. No. 17/977,834.
Prior Publication US 2024/0146314 A1, May 2, 2024
Int. Cl. H03L 7/089 (2006.01); H03L 7/099 (2006.01)
CPC H03L 7/0895 (2013.01) [H03L 7/0992 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A system, comprising:
a phase frequency detector (PFD);
a charge pump coupled to the PFD;
a loop filter coupled to the charge pump;
a voltage controlled oscillator (VCO) directly coupled to the loop filter;
a fast Fourier transform (FFT) engine coupled to an output of the VCO, the FFT engine configured to estimate a phase and a magnitude of reference spurs of an input reference signal; and
spur correction circuitry directly coupled to an input of the VCO, the spur correction circuitry configured to correct for the reference spurs of the input reference signal based at least in part on the phase and magnitude of the reference spurs.