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A very high slew-rate dynamic CMOS operational amplifier

: Klinke, Roland; Hosticka, Bedrich; Pfleiderer, Hans-Jörg

Univ. Manchester:
ESSCIRC '88. 14th European Solid State Circuits Conference. Proceedings
Manchester, 1988
pp. 203 - 206
European Solid State Circuits Conference <14, 1988, Manchester>
Conference Paper
Fraunhofer IMS ()

We present a dynamic CMOS operational amplifier with a special input circuit which injects an extra bias current to increase the slew-rate, depending on the input signal. The performance of this operational amplifier is compared to a conventional operational amplifier when used in a sample&hold circuit. The maximum operating clock frequency of the sample&hold circuit increases from 290 kHz up to 1 MHz with a hold-capacitor of 1 nF. The amplifier has been fabricated in a 5 µm CMOS process and dissipates a static power of 7.5 mW.