Abstract
Because of limited output swing, the basic structure of a gain-boosted cascode amplifier (GBCA) cannot be used to design a low-voltage operational amplifier. In this paper, we investigate the design of a high-swing GBCA, and find the optimum bandwidth for the boosting or feedback amplifier. This bandwidth eliminates the slow-settling component in the step response, prevents the gain-boosting loop from being unstable, and results in the shortest settling time. Finally, we present a very high-speed and high-swing amplifier suitable for low-voltage applications.
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