In this paper, an auto-zero amplifier which reduces the offset voltage and output voltage ripple caused by the non-ideal characteristics of CMOS switches is proposed. Three capacitors are used to store the compensation voltage for an internal amplifier in the proposed circuit. The capacitors hold the voltage between two input terminals of the amplifiers even if a charge injection and/or a clock feed through occur at CMOS switches. The proposed circuit reduces the output offset voltage to 43.8% and the output voltage ripple to 42.8% compared to the conventional circuit.
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