High CMRR low-voltage low power current output stage with a novel CMFB

In this paper, a low voltage low power (LPLV) current output stage (COS) with high CMRR is proposed. A novel common mode feedback (CMFB) technique is exploited to provide high CMRR. That is done by summing the main common mode signal and its opposite polarity one which provides over 112dB of CMRR in 0.18µm CMOS technology of TSMC. The circuit operates with very low supply voltages of ±0.5Vand consumes only 145µW power which show good improvement compared to other similar stages in literatures. Monte Carlo simulation of CMRR is also performed and shows its sufficient robustness against mismatches.

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