Switched-capacitor notch filter with programmable notch width an

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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328167, H03K 500

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active

053312180

ABSTRACT:
A notch filter circuit includes first and second operational amplifiers, each having a capacitor connected from the amplifier output to the input. A third capacitor is connected between the second-amplifier input and the filter circuit input. A first switched-capacitor resistor is connected between the filter circuit input and the first-amplifier input. A second switched-capacitor resistor is connected between the first amplifier output and the second amplifier input. The second-amplifier output is connected to the filter circuit output. A third switched-capacitor resistor is connected between said filter circuit output and said first amplifier input; First and second programmable capacitor arrays are connected respectively in parallel with the third switched-capacitor resistor and in parallel with the first switched-capacitor resistor, so that a change only in the capacitance of the second capacitor array causes a corresponding change in the filter notch depth and a change only in the capacitance of the first capacitor array causes a corresponding change in the filter notch width. The first and second capacitor arrays each have a group of digital programming terminals that may be connected together for making fixed the ratio of the capacitance values of the two arrays. A digitally programmable voltage divider circuit connected in series with the second programmable capacitor array permits the independent programing of notch depth, i.e. without affecting notch width.

REFERENCES:
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patent: 4785253 (1988-11-01), Hughes
patent: 4849662 (1989-07-01), Holberg et al.
patent: 4857778 (1989-08-01), Hague
patent: 4866779 (1989-09-01), Kennedy et al.
patent: 4939473 (1990-07-01), Eno
patent: 4954785 (1990-09-01), Segaram
Operational Amplifiers, G. E. Toby et al, (McGraw Hill), 1971, pp. 335-341.
Bipolar and MOS Integrated Circuit Design, Alan B. Grebene, (John Wiley and Sons), 1984, pp. 703-739.
Special Purpose Linear Devices Databook, National Semiconductor, 1989, pp. 4-15 through 4-35.

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