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Settling time is a very critical performance requirement for CMOS amplifiers in switched-capacitor circuits. The settling mechanism of gain-boosted amplifiers is very complicated. In this paper, the small-signal model for the gain-boosted cascode amplifier is analyzed. The gain bandwidth product and phase margin optimum values for the gain boosting amplifiers used inside gain-boosted cascode amplifiers are given for the minimum settling time. Finally, we present a low-voltage, high-gain and fast-settling time CMOS amplifier.