BiCMOS operational amplifier with precise and stable DC gain for high-frequency switched capacitor circuits
- 18 July 1991
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 27 (15) , 1338-1340
- https://doi.org/10.1049/el:19910842
Abstract
A novel approach in the design of high-frequency switched capacitor (SC) circuits is presented. It is based on the use of simple and fast amplifiers with low but precisely controlled gain value. The effect of the precisely known and stable opamp gain is compensated for by changing the capacitor values during the synthesis of the SC cell. An example of an opamp with these features and the synthesis of a biquadratic filter based on this approach are given.Keywords
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