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CMOS High-CMRR Current Output Stages

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5 Author(s)

Two CMOS current output stages are presented. Compared to the traditional solution, which exhibits unbalanced operation, the proposed ones exploit an auxiliary high-gain feedback loop which provides differential drive, thereby highly improving the common-mode rejection ratio (CMRR). Prototypes are designed and fabricated in a 0.35-mum technology and experimental results confirm that a CMRR increase greater than 20 dB can be achieved and, for one of the two solutions, without increasing the voltage requirements.

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Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:54 ,  Issue: 9 )