Title :
A novel 1V, 24µW, ΣΔ modulator using Amplifier & Comparator Based Switched Capacitor technique, with 10-kHz bandwidth and 64dB SNDR
Author :
Ali, Shafqat ; Tanner, Steve ; Farine, Pierre Andre
Author_Institution :
Swiss Fed. Inst. of Technol. (EPFL), Lausanne, Switzerland
Abstract :
A new technique, Amplifier and Comparator Based Switched Capacitor (ACBSC) for low voltage switched cap circuits, is presented. ACBSC combines the recently introduced CBSC (comparator based switched capacitor circuit) with an amplifier. The current sources in ACBSC experience less output voltage swing compared to the ones in CBSC. We apply ACBSC to the design of a 3rd-order sigma delta modulator in a 0.18 μm CMOS process technology, with a bandwidth of 10 kHz. Simulations show that the SDM achieves a peak SNDR of higher than 64 dB and consumes 24 μW from 1 Volt supply.
Keywords :
CMOS digital integrated circuits; amplifiers; comparators (circuits); sigma-delta modulation; switched capacitor networks; ΣΔ modulator; 3rd-order sigma delta modulator design; ACBSC; CMOS process technology; SDM simulations; amplifier-comparator-based switched capacitor technique; bandwidth 10 kHz; low-voltage switched cap circuits; power 24 muW; size 0.18 mum; voltage 1 V; CMOS integrated circuits; Converters; MOS devices; Semiconductor device modeling; Signal to noise ratio; Switches; Switching circuits; CBSC; Low voltage design; Sigma delta modulator;
Conference_Titel :
Electronics, Circuits, and Systems (ICECS), 2010 17th IEEE International Conference on
Conference_Location :
Athens
Print_ISBN :
978-1-4244-8155-2
DOI :
10.1109/ICECS.2010.5724714
