Title :
Optimum selection of capacitive array for multibit Sigma-Delta modulators without DEM
Author :
Caracciolo, Hervé ; Talay, Selçuk ; Maloberti, Franco
Author_Institution :
Dept. of Electron., Univ. of Pavia, Pavia, Italy
Abstract :
A method for a smart selection and sequencing of unity capacitors in a multibit DAC is proposed. The approach, suitable for the DAC nonlinearity correction in sigma-delta modulators, obtains results that are better than the dynamic element matching. Key of the technique is an off-line self-measurement of mismatches. The results significantly improve when the DAC capacitors are selected from a set that is larger than required. An affordable silicon area overhead avoids extra power consumption during the normal operation of the converter.
Keywords :
digital-analogue conversion; sigma-delta modulation; DAC capacitor; DAC nonlinearity correction; capacitive array; multibit DAC; multibit sigma-delta modulator; Analog-digital conversion; Calibration; Capacitors; Costs; Delta-sigma modulation; Energy consumption; Laboratories; Linearity; Noise shaping; Silicon;
Conference_Titel :
Electronics, Circuits, and Systems, 2009. ICECS 2009. 16th IEEE International Conference on
Conference_Location :
Yasmine Hammamet
Print_ISBN :
978-1-4244-5090-9
Electronic_ISBN :
978-1-4244-5091-6
DOI :
10.1109/ICECS.2009.5410766
