Switched capacitor filter for low voltage applications

Details Switched capacitor filter for low voltage applications Switched capacitor filter for low voltage applications

1986-08-04

1987-12-29

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, 330 9, H03K 500, H03F 102

Patent

active

047163194

ABSTRACT:
An improved switched capacitor circuit configuration is disclosed which exhibits improved low voltage supply operation and improved charge injection cancellation performance. In the preferred embodiment of a switched capacitor integrator, the improvement is realized by the particular configuration of a switched tub switch on the input, single N-channel devices at the summing junction, skewing the analog ground V.sub.AG downward, and delaying the clock signals to turn off the switches at the summing junction before the charge injection of the switched tub switch is realized.

REFERENCES:
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patent: 3810031 (1974-05-01), Poujois
patent: 4365204 (1982-12-01), Haque
patent: 4393351 (1983-07-01), Gregorian et al.
patent: 4403195 (1983-09-01), Wurzburg
patent: 4442529 (1984-04-01), Ahuja et al.
patent: 4473761 (1984-09-01), Peterson
patent: 4555668 (1985-11-01), Gregorian et al.
patent: 4565971 (1986-01-01), Brookshire
patent: 4636738 (1987-01-01), Westwick et al.
Martin, "Improved Circuits for the Realization of Switched Cap. Filters", ISCAS, Jul. 1979, pp. 756-759.
Allstot et al., "Technological Design Considerations for Monolithic MOS Switched-Capacitor Filtering Systems", Proc. of the IEEE, vol. 71, No. 8, Aug. 1983, pp. 967-986.
Brodersen et al., "MOS Switched Capacitor Filters", Proc. of IEEE, vol. 67, No. 1, Jan. 1979, pp. 61-75.
Gregorian et al., "A Continuously Variable Slope Adaptive Delta Modulation Codec System", IEEE Journal of Solid-State Circuits, vol. SC-18, No. 6, Dec. 1983, pp. 692-700.

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