Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1986-04-14
1989-07-18
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328167, 364825, H03H 1502, H03H 964, H03H 1900
Patent
active
048496626
ABSTRACT:
A method and circuitry for time-sharing a digitally-programmable capacitive element, particularly in conjunction with a switched-capacitor filter circuit. The method includes: selecting a first capacitance value for the capacitive element; initializing the charge on the capacitive element; connecting the capacitive element to first preselected nodes of an electronic circuit; disconnecting the capacitive element from the first preselected nodes of after any charge transfer has substantially been completed; changing the capacitance of the capacitive element to a new desired value; initializing the charge on the capacitive element; and then connecting the capacitive element to other preselected nodes of the electronic circuit. A biquad switched-capacitor filter circuit is configured to use such method in its operation.
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Allstot et al, "Electrically-Programmable Switched Cap Filter", IEEE Journal of Solid-State Circuits, vol. SC-14, No. 6, Dec. 1979, pp. 1034-1041.
Broton et al., "Time Multiplexed Active Filters", IEEE JSSC, vol. SC-7, No. 3, Jun. 1972, pp. 259-265.
Cox et al., "Realtime Programmable Switched Cap. Filter", IEEE Solid-State Conference, Feb. 1980, pp. 94, 95, and 264.
Gregorian, "Filtering Techniques with Switched Cap. Circuits", Microelectronics Journal, vol. 11, No. 2, Mar.-Apr. 1980, pp. 13-21.
Kleine et al., "Real-Time Programmable Unit-Element SC Filter for LPC Synthesis", Electronic Letters, vol. 17, No. 17, Aug. 20, 1981, pp. 600-602.
Holberg Douglas R.
Swanson Eric J.
Callahan Timothy P.
Crystal Semiconductor Corporation
Miller Stanley D.
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