Title :
A Low Power Sigma-Delta Modulator Using Class-C Inverter
Author :
Chae, Youngcheol ; Han, Gunhee
Author_Institution :
Yonsei Univ., Seoul
Abstract :
In switched capacitor sigma-delta (SigmaDelta) analog-to-digital converters (ADCs), an operational transconductance amplifier (OTA) is the main building block and consumes most of power. This paper proposes that the OTAs can be replaced with class-C inverters for low-power consumption without sacrificing the performance. A second order SigmaDelta modulator using class-C inverter technique is fabricated with a 0.35-mum CMOS process, occupies 3024 mum2 , dissipates 5.6-muW under 1.2 V supply-voltage, and provides 63-dB/72-dB/76-dB SNDR/SNR/DR over 8-kHz signal bandwidth.
Keywords :
CMOS integrated circuits; analogue-digital conversion; invertors; low-power electronics; power consumption; sigma-delta modulation; switched capacitor networks; CMOS process; class-C inverter technique; low power consumption; low power sigma-delta modulator; operational transconductance amplifier; power 5.6 muW; second order modulator; size 0.35 mum; switched capacitor sigma-delta analog-to-digital converters; voltage 1.2 V; Analog-digital conversion; Bandwidth; CMOS process; Capacitors; Delta-sigma modulation; Inverters; Operational amplifiers; Power amplifiers; Signal processing; Transconductance;
Conference_Titel :
VLSI Circuits, 2007 IEEE Symposium on
Conference_Location :
Kyoto
Print_ISBN :
978-4-900784-05-5
Electronic_ISBN :
978-4-900784-05-5
DOI :
10.1109/VLSIC.2007.4342734
