Design of OTAs for ultra-low-power sigma-delta ADCs in medical applications
2010 (English)In: International Conference on Signals and Electronic Systems, IEEE , 2010, 229-232 p.Conference paper (Refereed)
High-resolution sigma-delta ADCs are gaining significant interest in ultra-low-power medical applications, where accurate measurement of low-frequency and weak electrophysiological signals is required. Operational transconductance amplifiers (OTA) are the key analog component and the most power-hungry part of the sigma-delta (ΣA) modulators. This paper presents a study of OTAs for ultra-low-power operation, including design and a comparative analysis of four OTA architectures implemented in 65nm CMOS Technology. The requirements for OTA gain and GBW are driven in terms of ΣA ADC specifications. The OTAs' impact on modulator SNR has been investigated by simulation. The results show that a two-stage OTA with load compensation yields highest SNR and lowest power dissipation amongst the four OTAs in this study.
Place, publisher, year, edition, pages
IEEE , 2010. 229-232 p.
CMOS integrated circuits, bioelectric phenomena, biomedical electronics, biomolecular electronics, low-power electronics, operational amplifiers, sigma-delta modulation
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-65455ISBN: 978-1-4244-5307-8OAI: oai:DiVA.org:liu-65455DiVA: diva2:395820
IEEE International Conference on Signal and Electronic Systems, September 7-10, Gliwice, Poland