Abstract
A low noise preamplifier used for biomedical signal acquisition is presented in the paper. A “T-type feedback” operational amplifier topology structure is used here based on the traditional “AC coupling-capacitor feedback”. The resulting amplifier, built in SMIC 0.18um standard CMOS process, processes signals from 0.2/25Hz to 10 kHz with an input-referred noise of 0.96uVrms and a power dissipation of 18.54uW while occupying 0.065mm2 of chip area. The simulation results show that, the presented preamplifier has proper gain and bandwidth, small input-referred noise and chip area consumption. It is suitable for the applications in low power, low noise and high integration circuits used for biomedical signal acquisition.
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