A low power high GBW Fully Differential subthreshold CMOS opamp for CT ΔΣ modulators

Author

Atac, Aytac ; Geller, Artur ; Wunderlich, Ralf ; Heinen, Stefan

Author_Institution

Dept. of Integrated Analog Circuits & RF Syst., RWTH Aachen Univ., Aachen, Germany

fYear

2011

fDate

3-7 July 2011

Firstpage

205

Lastpage

208

Abstract

A very low power differential opamp operating in subthreshold region is proposed. The presented architecture achieves 8 MHz gain-bandwidth and 20 V/μsec slew rate with 5 pF load while consuming a total power of 36 μW. Full voltage swing is obtained at the output by using a push-pull stage. The opamp aims to extend the application of very low power subthreshold opamps to moderate bandwidth, continuous time ΔΣ modulators by enhancing the gain-bandwidth product and improving the slew rate performance. The design is simulated with 0.13 μm CMOS process, and operates with 1.2 V supply voltage.

Keywords

CMOS digital integrated circuits; differential amplifiers; low-power electronics; operational amplifiers; sigma-delta modulation; CMOS process; capacitance 5 pF; continuous time ΔΣ modulators; gain-bandwidth product; power 36 muW; push-pull stage; size 0.13 mum; slew rate; very-low-power differential opamp; voltage 1.2 V; Bandwidth; CMOS integrated circuits; MOS devices; Noise; Receivers; Transistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Ph.D. Research in Microelectronics and Electronics (PRIME), 2011 7th Conference on

Conference_Location

Trento

Print_ISBN

978-1-4244-9138-4

Electronic_ISBN

978-1-4244-9136-0

Type

conf

DOI

10.1109/PRIME.2011.5966253

Filename

5966253