Title :
Improved offline calibration for DAC mismatch in low OSR ΣΔ ADCs with distributed feedback
Author :
De Bock, M. ; Babaie-Fishani, A. ; Rombouts, P.
Author_Institution :
Dept. ELIS, Ghent Univ. (UGent), Ghent, Belgium
Abstract :
We present an offline calibration method to correct the non-linearity due to DAC element mismatch in distributed feedback SigmaDelta-modulation A/D-converters. The improvement over previous methods is that not only the first feedback DAC is calibrated, but also the DACs that are coupled to later stages can be calibrated as well. This is needed in the case of Sigma Delta modulators with a low OSR, where the contribution of the second feedback DAC should not be neglected. The technique is based on a calibration measurement with a two-tone input signal.
Keywords :
analogue-digital conversion; calibration; circuit feedback; digital-analogue conversion; sigma-delta modulation; DAC element mismatch; calibration measurement; digital-to-analog converter; distributed feedback; improved offline calibration method; low OSR ΣΔ ADC; over-sampling ratio; sigma delta-modulation analog-digital converter; two-tone input signal; Bandwidth; Calibration; Distributed feedback devices; Modulation; Noise; Quantization (signal); Table lookup;
Conference_Titel :
Circuits and Systems (ISCAS), 2014 IEEE International Symposium on
Conference_Location :
Melbourne VIC
Print_ISBN :
978-1-4799-3431-7
DOI :
10.1109/ISCAS.2014.6865291
