An integrated CMOS bio-potential amplifier with a feed-forward DC cancellation topology.
This paper describes a novel technique to realize an integrated CMOS bio-potential amplifier with a feedforward DC cancellation topology. The amplifier is designed to provide substantial DC cancellation even while amplifying very low frequency signals. More than 80 dB offset rejection ratio is achieved without any external capacitors. The cancellation scheme is robust against process and temperature variations. The amplifier is fabricated through MOSIS AMI 1.5 microm technology (0.05 mm2 area). Measurement results show a gain of 43.5 dB in the pass band (<1 mHz-5 KHz), an input referred noise of 3.66 microVrms, and a current consumption of 22 microA.
Parthasarathy
Jayant
J
Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN 55455, USA. jaya0016@umn.edu
Erdman
Arthur G
AG
Redish
Aaron D
AD
Ziaie
Babak
B
D000669:Amplifiers, Electronic / Q000706:statistics & numerical data; D001698:Biomedical Engineering; D001701:Bionics / Q000295:instrumentation / Q000706:statistics & numerical data; D004582:Electronics, Medical / Q000295:instrumentation / Q000706:statistics & numerical data; D005246:Feedback; D006801:Humans; D008328:Man-Machine Systems; D012666:Semiconductors / Q000706:statistics & numerical data; D012815:Signal Processing, Computer-Assisted