Title :
An 88dB 48 KHz full feed-forward sigma-delta modulator
Author :
Zhu, CongYi ; Zhang, Yaohui ; Ma, WenLong ; XiaoP, Hailin ; Liu, Hongbing ; He, Ling
Author_Institution :
Div. of Syst. Integration & IC Design, Chinese Acad. of Sci., Suzhou, China
Abstract :
This paper examines the design of full feed-forward sigma-delta modulator which is much more suitable for the CMOS digital process with low supply voltage than the traditional second-order feedback loop. The full feed-forward system reduces the modulator´s sensitivity of the circuit nonidealities and decreases the internal signal swing to half the full scale. An implementation in a 0.35 ¿m CMOS technology achieved dynamic range of 88 dB, bandwidth of 48 kHz and power consumption of 5 mW. It can operate from supply voltages ranging from 2.4 V-3.3 V. The architecture is quite useful for low voltage SOC applications, such as portable biomedical system.
Keywords :
CMOS digital integrated circuits; VHF circuits; low-power electronics; sigma-delta modulation; system-on-chip; CMOS digital process; CMOS technology; bandwidth 48 kHz; circuit nonideality; feed-forward sigma-delta modulator; internal signal swing; low voltage SOC applications; modulator sensitivity; portable biomedical system; power 5 mW; power consumption; size 0.35 mum; voltage 2.4 V to 3.3 V; CMOS process; CMOS technology; Circuits; Delta-sigma modulation; Digital modulation; Dynamic range; Dynamic voltage scaling; Feedback loop; Feedforward systems; Low voltage;
Conference_Titel :
Microelectronics & Electronics, 2009. PrimeAsia 2009. Asia Pacific Conference on Postgraduate Research in
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-4668-1
Electronic_ISBN :
978-1-4244-4669-8
DOI :
10.1109/PRIMEASIA.2009.5397380
