US 9,813,074 B2
Calibration of interpolating string digital-to-analog converters
Zhang Jun, Shanghai (CN); Xuan Wang, Goleta, CA (US); Dongyu Ou, Shanghai (CN); Elliott Zhang, Shanghai (CN); and Echo Cao, Shanghai (CN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Mar. 27, 2017, as Appl. No. 15/470,274.
Application 15/470,274 is a continuation of application No. 15/152,384, filed on May 11, 2016, granted, now 9,621,177.
Application 15/152,384 is a continuation of application No. PCT/CN2015/096626, filed on Dec. 8, 2015.
Prior Publication US 2017/0201265 A1, Jul. 13, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. H03M 1/10 (2006.01); H03M 1/66 (2006.01); H03M 1/12 (2006.01); H03M 1/74 (2006.01); H03M 1/00 (2006.01)
CPC H03M 1/1033 (2013.01) [H03M 1/66 (2013.01); H03M 1/00 (2013.01); H03M 1/12 (2013.01); H03M 1/747 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A digital-to-analog converter (DAC) calibrator comprising:
a first codeword calibrator to determine a first calibration codeword based on a first nonlinearity error value measured at an output of a DAC when a most-significant-bit (MSB) portion of an input codeword is applied to an input of the DAC;
a second codeword calibrator to determine a second calibration codeword based on a second measured nonlinearity error value measured at the output of the DAC when a least-significant-bit (LSB) portion of the input codeword is applied to the input of the DAC; and
a calibration codeword combiner to combine the first calibration codeword and the second calibration codeword to determine a third calibration codeword to be accessed by the DAC to calibrate the output of the DAC when the input codeword is applied to the DAC.