H - Electricity – 03 – H
Patent
H - Electricity
03
H
333/50
H03H 19/00 (2006.01) G06G 7/186 (2006.01)
Patent
CA 1309757
Abstract of the Disclosure A switched capacitor circuit with a very large time constant. Numerous low frequency analog applications, modems for example, require this type of circuit. The capacitances required to obtain a sufficiently large time constant are reduced over prior art techniques by as much as 50%. The circuit isinsensitive to parasitic capacitances. The circuit comprises a switched input sampling capacitor, an operational amplifier and a first feedback capacitor connected in parallel with the amplifier. The switched sampling capacitor samples an input signal in a first clock phase. A second feedback capacitor is switched during the first phase to sample the output of the operational amplifier; and, in a second phase, it is switched in parallel with the first feedback capacitor of the amplifier.
596246
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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