Title :
Design of 0.4V, 386nW OTA using DTMOS technique for biomedical applications
Author :
Kargaran, Ehsan ; Sawan, Mohamad ; Mafinezhad, Khalil ; Nabovati, Hooman
Author_Institution :
Microelectron. Lab., Sadjad Inst. for Higher Educ., Mashhad, Iran
Abstract :
An ultra-low-voltage ultra-low-power operational transconductance amplifier (OTA) using dynamic threshold MOS (DTMOS) technique is presented in this paper. The proposed topology is based on a bulk and gate driven input differential pair employs a gain-stage in the Miller capacitor feedback path to improve the pole-splitting effect. The circuit is designed in the 0.18μm CMOS technology. The simulation results show that the amplifier has a 91dB open-loop DC gain and a unity gain-bandwidth of 111.4 kHz while operating at 0.4V supply voltage. This technique show remarkable enhancement in unity gain-bandwidth and also in DC gain compared to the bulk driven input differential pair technique. The total power consumption is as low as 386nW which makes it suitable for low-power bio-medical applications.
Keywords :
CMOS analogue integrated circuits; biomedical electronics; capacitors; low-power electronics; operational amplifiers; power consumption; DTMOS technique; Miller capacitor feedback; OTA; bandwidth 111.4 kHz; bulk driven input differential pair technique; dynamic threshold MOS technique; gain 91 dB; low-power biomedical application; open-loop DC gain; pole-splitting effect; power 386 nW; power consumption; size 0.18 mum; ultra-low-voltage ultra-low-power operational transconductance amplifier; voltage 0.4 V; CMOS integrated circuits; Gain; Logic gates; MOSFET circuits; Threshold voltage; Transconductance; Transistors; dynamic threshold MOS (DTMOS); operational transconductance amplifier; ultra low power; ultra low voltage;
Conference_Titel :
Circuits and Systems (MWSCAS), 2012 IEEE 55th International Midwest Symposium on
Conference_Location :
Boise, ID
Print_ISBN :
978-1-4673-2526-4
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2012.6292009
