Multiple stage tracking filter using a self-calibrating RC oscil

Details Multiple stage tracking filter using a self-calibrating RC oscil Multiple stage tracking filter using a self-calibrating RC oscil

1995-06-07

1997-09-02

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327113, 327100, 327148, 327157, 327554, 331111, 330305, H03K 500, H04B 100

Patent

active

056636750

ABSTRACT:
A multiple stage tracking filter includes a self-calibrating RC oscillator, a resistor connected to the self-calibrating RC oscillator and a capacitor connected to the self-calibrating RC oscillator. The filter further includes a switched capacitor filter element connected to the self-calibrating RC oscillator. The switched capacitor filter elements include a switch which is controlled by a timing signal from the self-calibrating RC oscillator. A method of filtering a signal includes the steps of operating a self-calibrating RC oscillator to generate a timing signal, tuning a plurality of cascaded filter elements with the generated timing signal and passing a signal through the plurality of tuned cascaded filter elements.

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patent: 4998075 (1991-03-01), Patton, III et al.
patent: 5017919 (1991-05-01), Hull et al.
patent: 5070311 (1991-12-01), Nicolai
Application Note 13, pp. AN13-8 -AN13-9, and AN13-11 -AN13-14, not dated.
S.M. Sze, "Physics of Semiconductor Devices", .COPYRGT.1969, Fig. 20 no month.

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