Feedback charge-transfer comparator with zero static power

The feedback charge transfer (FCT) amplifier latch comparator uses a dynamic feedback mechanism in the charge transfer (CT) preamplifier. The FCT amplifier latch rapidly amplifies input signal and latches with zero static power. Circuit operation is nearly insensitive to device parameter fluctuations. The authors present the design and performance characteristics of such a comparator implemented in a 1.2 /spl mu/m double-poly double metal CMOS process.