Title :
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
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;
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
DOI :
10.1109/PRIME.2011.5966253
