Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-07-13
1994-07-19
Bertsch, Richard A.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328167, H03K 500
Patent
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.
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Special Purpose Linear Devices Databook, National Semiconductor, 1989, pp. 4-15 through 4-35.
Latham, II Paul W.
Moody Kristaan L.
Allegro Microsystems Inc.
Bertsch Richard A.
Scheuermann David W.
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