Switched-capacitor circuit with large time constant

Details Switched-capacitor circuit with large time constant Switched-capacitor circuit with large time constant

1988-04-11

1990-01-16

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307520, 307521, 328167, G06G 718, H03B 100

Patent

active

048946206

ABSTRACT:
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 is insensitive 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.

REFERENCES:
patent: 4393351 (1983-07-01), Gregorian et al.
patent: 4404525 (1983-09-01), Amir et al.
patent: 4543534 (1985-09-01), Temes et al.
patent: 4617481 (1986-10-01), Masuda et al.
"Increasing the Clock Frequency of Switched-Capacitor Filters", Electronic Letters, vol. 16, Viswanathan et al., 1980, pp. 316-317.
"A Family of Active Switched-Capacitor Biquad Building Blocks", Bell System Technical Journal, vol. 58, P. Fleisher et al., Dec. 1979, pp. 2235-2269.
"Switched-Capacitor Circuit Design", Proc. IEEE, vol. 71, Gregorian et al., Aug. 1983, pp. 941-966.
"An Area-Efficient Approach to the Design of Very Large Time Constants in Switched-Capacitor Integrators", IEEE J. Solid-State Circuits, vol. SC-19, Sansen et al., Oct. 1984, pp. 772-779.
"Large Time-Constant SC Circuits and Uni-Value Capacitor SC Circuits Using Multi-Phase Clock", Proc. IEEE, International Symposium on Circuits and Systems, M. Yamamoto, May. 1982, pp. 225-228.

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