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An enhanced super class AB recycling folded cascode (RFC) operational transconductance amplifier is presented. It combines various adaptive biasing and transconductance enhancement techniques. Measurement results of a CMOS 130 nm test chip prototype show an improvement in slew rate and gain-bandwidth product by factors 100 and 27, respectively, compared to the conventional RFC topology for the same supply voltage and bias currents.
Algueta et al. (Sun,) studied this question.
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