Title :
A 0.8-μW switched-capacitor sigma-delta modulator using a class-C inverter
Author :
Chae, Youngcheol ; Kwon, Minho ; Han, Gunhee
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea
Abstract :
An ultra low power second-order switched capacitor (SC) sigma-delta (ΣΔ) modulator is presented. Using of a class-C inverter instead of an operational transconductance amplifier (OTA) enables the SC ΣΔ modulator to achieve sub-μW power consumption. The proposed modulator has been implemented using a 0.35μm CMOS process. The measured peak SNR of the modulator is 56dB in a 3kHz signal bandwidth with sampling frequency of 200kHz. Its dynamic range is approximately 56 dB and the power consumption is only 0.8μW with a 1V power supply.
Keywords :
invertors; low-power electronics; sigma-delta modulation; switched capacitor networks; 0.35 micron; 0.8 muW; 1 V; 200 kHz; 3 kHz; CMOS process; class-C inverter; operational transconductance amplifier; power consumption; sigma-delta modulator; switched-capacitor; Bandwidth; CMOS process; Delta-sigma modulation; Energy consumption; Frequency measurement; Inverters; Operational amplifiers; Power amplifiers; Power capacitors; Transconductance;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328404
