Title :
Subthreshold operation of Nauta´s operational transconductance amplifier
Author :
Irfansyah, Astria Nur ; Nicholson, Andrew ; Jenkins, Julian ; Hamilton, Tara Julia ; Lehmann, Torsten
Author_Institution :
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Kensington, NSW, Australia
Abstract :
This paper investigates the subthreshold operation of the inverter-based operational transconductance amplifier for the potential use in very low power data conversion systems. Circuit analysis and sizing strategies are presented, and a first order continuous-time delta-sigma modulator circuit is used as a case study to verify the performance of the amplifier when operating in subthreshold region. We demonstrate experimental results using a digitally configurable Nauta operational transconductance amplifier implemented in a 180nm CMOS process which shows up to 97.76 percent power reduction when 600mV is used instead of 1.8V as supply with better figure of merit and without significant signal-to-noise distortion ratio penalty highlighting its significant potential at subthreshold operation.
Keywords :
CMOS digital integrated circuits; delta-sigma modulation; low-power electronics; operational amplifiers; CMOS process; circuit analysis; digitally configurable Nauta operational transconductance amplifier; first order continuous-time delta-sigma modulator circuit; inverter-based operational transconductance amplifier; size 180 nm; sizing strategies; subthreshold operation; very low power data conversion systems; voltage 600 mV; CMOS integrated circuits; CMOS process; Inverters; Modulation; Semiconductor device modeling; Transconductance; Tuning;
Conference_Titel :
New Circuits and Systems Conference (NEWCAS), 2015 IEEE 13th International
Conference_Location :
Grenoble
DOI :
10.1109/NEWCAS.2015.7182065
