Title :
A low-voltage 38μW sigma-delta modulator dedicated to wireless signal recording applications
Author :
Hu, Yamu ; Lu, Zhijun ; Sawan, Mohamad
Author_Institution :
Dept. of Electr. Eng., Ecole Polytech. de Montreal, Que., Canada
Abstract :
We present in this paper a second order Σ-Δ modulator working under a supply voltage of 900 mV, which is dedicated to wireless signal recording. A new fully differential CMOS class AB Operational transconductance amplifier (OTA) is proposed to realize a rail-to-rail operation range by using a charge-pump to provide the supply only to the input stage. The modulator has been implemented using a 0.18 μm CMOS technology. It achieves a SNR of 74 dB that be able to handle the signal from DC to 10 kHz. And the total power consumption is less than 38 μW.
Keywords :
CMOS integrated circuits; low-power electronics; operational amplifiers; sigma-delta modulation; 0 to 10 kHz; 0.18 micron; 38 muW; 900 mV; SNR; charge-pump; class AB Operational transconductance amplifier; fully differential CMOS; power consumption; rail-to-rail operation; second order modulator; sigma-delta modulator; supply voltage; wireless signal recording applications; CMOS technology; Charge pumps; Delta-sigma modulation; Differential amplifiers; Energy consumption; Operational amplifiers; Rail to rail amplifiers; Rail to rail operation; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205753
