Title :
Two-order low-power sigma-delta modulator with SC techniques
Author :
Lei, Zhang ; Xian-li, Zhao ; Xing-hua, Wang ; Ruo-yuan, Qu
Author_Institution :
Dept. of Electron. Eng., Beijing Inst. of Technol., Beijing, China
Abstract :
This paper presents a sigma-delta modulator of two-order with switched-capacitors (SC) techniques for low power in 0.18 um CMOS process. Without continues current transmission SC techniques present a discrete low power system. And a low power op amplifier with discrete common-mode feedback and a dynamic comparator is also designed. This new amp works under the supply of 1.8 v and with the direct current of 200 uA. The tool Matlab is used to simulate the behavior system, while Cadence is used to design the circuit and the layout in 0.18 um CMOS (1.8 v model) process. The modulator achieves 81 dB dynamic range in 24-kHz signal bandwidth with OSR=128. And it consumes 0.8 mW under 1.8 v supply voltage.
Keywords :
CMOS analogue integrated circuits; circuit feedback; comparators (circuits); integrated circuit design; low-power electronics; operational amplifiers; sigma-delta modulation; switched capacitor networks; CMOS process; Matlab tool; SC technique; bandwidth 24 kHz; circuit design; current 200 muA; discrete common-mode feedback; discrete low power system; dynamic comparator; low power op amplifier; power 0.8 mW; size 0.18 mum; switched-capacitor; two-order low-power sigma-delta modulator; voltage 1.8 V; Bandwidth; CMOS process; Circuit simulation; Delta-sigma modulation; Dynamic range; Feedback; Mathematical model; Power system dynamics; Power system simulation; Semiconductor device modeling;
Conference_Titel :
Semiconductor Electronics (ICSE), 2010 IEEE International Conference on
Conference_Location :
Melaka
Print_ISBN :
978-1-4244-6608-5
DOI :
10.1109/SMELEC.2010.5549418
