Precision switched capacitor ratio system

Details Precision switched capacitor ratio system Precision switched capacitor ratio system

1994-01-24

1995-06-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

By integrating

327554, H03K 500, H03K 1714

Patent

active

054246709

ABSTRACT:
A precision switched capacitor ratio system includes a capacitor; a switching device for selectively interconnecting the capacitor with one of a plurality of charging circuits and alternately connecting it with a discharge circuit for discharging the capacitor between each interconnection with a charging current; an integrating device interconnected with the capacitor for averaging the current during the charging and discharging of the capacitor for defining the switched capacitor equivalent resistance; and a clock device for providing synchronized clock signals for operating the switching device to precisely define the ratio of the frequencies of the interconnection of the capacitor with each of the charging circuits.

REFERENCES:
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patent: 4520283 (1985-05-01), Sasaki et al.
patent: 4543546 (1985-09-01), Hariharan
patent: 4698596 (1987-10-01), Haigh et al.
patent: 4845383 (1989-07-01), Iida
patent: 5258664 (1993-11-01), White
Solomon, Switched-capacitor filters: precise, compact, inexpensive, IEEE Spectrum Jun. 1988, pp. 28-32.
Krummenacher, Micropower Switched Capacitor Biquadratic Cell IEEE Journal of Solid State Circuits, vol. SC-17, No. 3, Jun. 1982, pp. 507-508.
Hsieh et al, A Low-Noise Chopper-Stabilized Differential Switched-Capacitor Filtering Technique, IEEE Journal, vol. SC-16, No. 6, Dec. 1981, pp. 708-709.

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