Abstract

A compact, high slew rate, low distortion CMOS operational amplifier employing an internal feedback transistor instead of the more usual compensation capacitor is reported, which is fabricated using an n-well CMOS silicon-gate technology. The operational amplifier has an open-loop gain exceeding 60dB, a slew rate of +36/−50 V per microsecond, a one-per-cent settling time of 0.25 microsecond, a total harmonic distortion of −73 dB and a power dissipation of 11.5 mW. The design principles are summarised with particular emphasis on the novel transistor feedback compensation circuit. Results for a switched-capacitor filter employing such an operational amplifier are summarised.

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