Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – By integrating
Patent
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.
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Solomon, Switched-capacitor filters: precise, compact, inexpensive, IEEE Spectrum Jun. 1988, pp. 28-32.
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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.
Samuels Howard R.
Wayne Scott H.
Analog Devices Inc.
Callahan Timothy P.
Englund Terry L.
Iandiorio Joseph S.
Teska Kirk
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