Title :
A DAC mismatch calibration technique for multibit ΣΔ modulators
Author :
Ali, Shady ; Tanner, Steve ; Farine, Pierre Andre
Author_Institution :
Ecole Polytech. Fed. de Lausanne (EPFL), Lausanne, Switzerland
Abstract :
A technique for the calibration of DAC (digital to analog converter) mismatch errors in multibit ΣΔ modulators (SDM) is presented. It consists of two parts: the first is a measurement technique to obtain the relative mismatch of each feedback DAC element. The second is a correction method applied to the modulator output to correct for the effect of DAC non linearity. The proposed technique works completely in the background. The paper presents a detailed analysis of the possible error sources affecting the accuracy of the calibration, as well as a comparison with other state of the art techniques. The technique is applied to a 3rd order SDM showing almost ideal characteristics after calibration.
Keywords :
circuit feedback; digital-analogue conversion; sigma-delta modulation; 3rd order SDM; DAC mismatch calibration technique; DAC nonlinearity; correction method; digital to analog converter mismatch error; error sources; feedback DAC element; measurement technique; modulator output; multibit ΣΔ modulator; relative mismatch; Calibration; Capacitors; Clocks; Linearity; Modulation; Sigma-delta modulation; Transfer functions; background DAC calibration; modulator; sigma-delta;
Conference_Titel :
New Circuits and Systems Conference (NEWCAS), 2013 IEEE 11th International
Conference_Location :
Paris
Print_ISBN :
978-1-4799-0618-5
DOI :
10.1109/NEWCAS.2013.6573606
