Title :
A 1-V 5 μW CMOS-opamp with bulk-driven input transistors
Author :
Lasanen, Kimo ; Raisanen-Ruotsalainen, Elvi ; Kostamovaara, Juha
Author_Institution :
Dept. of Electr. Eng. & Infotech Oulu, Oulu Univ., Finland
Abstract :
In this paper, a low-power CMOS operational amplifier for biomedical instrumentation operating with a 1-V supply is described. Large input common-mode range (CMR) is achieved utilizing bulk-driven PMOS-transistors as an input differential pair of the opamp. The opamp was fabricated in a 0.35 μm n-well double-poly CMOS process with threshold voltages of 0.5 V and 0.65 V. The open-loop gain (A0) of the amplifier is 70 dB, the gain-bandwidth product (GBW) is 190 kHz and the phase margin (PM) is 60° with a 7 pF load. The power consumption of the opamp is 5 μW
Keywords :
CMOS analogue integrated circuits; biomedical electronics; instrumentation amplifiers; low-power electronics; operational amplifiers; 0.35 micron; 1 V; 5 muW; 70 dB; CMOS operational amplifier; battery-operated biomedical devices; biomedical instrumentation; bulk-driven PMOS transistors; common-mode range; input differential pair; large input CMR; low-power CMOS opamp; n-well double-poly CMOS process; Capacitance measurement; Circuits; Frequency; Low-frequency noise; MOSFETs; Noise measurement; Parasitic capacitance; Rails; Threshold voltage; Transconductance;
Conference_Titel :
Circuits and Systems, 2000. Proceedings of the 43rd IEEE Midwest Symposium on
Conference_Location :
Lansing, MI
Print_ISBN :
0-7803-6475-9
DOI :
10.1109/MWSCAS.2000.951394
