New CMOS instrumentation amplifier dedicated to very low-amplitude signal applications

This paper describes a new low-voltage low-power CMOS instrumentation amplifier used, among others, for biomedical applications. Since the nerve signal monitored with this amplifier has very low amplitude and low frequency, it is, at first fed to a low voltage chopper amplifier to reduce the flicker (1/f) noise then amplified with a new programmable, with high CMRR instrumentation amplifier. The design and the simulation results are presented. The layout is drawn in 0.35 /spl mu/m CMOS process with an active area of 0.145 mm/sup 2/. The preliminary test results are consistent with the simulation.