Wave transmission lines and networks – Negative resistance or reactance networks of the active type
Patent
1980-06-30
1981-10-20
Gensler, Paul L.
Wave transmission lines and networks
Negative resistance or reactance networks of the active type
330107, 328128, 333216, H03H 1146
Patent
active
042963923
ABSTRACT:
A two terminal circuit comprising a capacitive element (with a negative capacitance of value -C/2) connected between the terminals, and an integrated capacitor (with a positive capacitance C) having one and other sides thereof alternately or periodically connected to associated sides of the element and to ground for simulating a floating bilinear resistor having a resistance R=T/C across the terminals which satifies the bilinear transformation s=(2(z-1/T)z+1). This circuit is insensitive to both top and bottom plate parasitic capacitance effects assocated with the capacitance when one terminal is connected to a voltage source and the other to a virtual ground point on the input to an operational amplifier. In alternate embodiments, the circuit simulates a grounded bilinear resistor when only one of the terminals is connected to ground, and when one terminal and one side of the capacitor are grounded. In many applications the negative capacitive element may be absorbed by a positive capacitor of larger capacitance that is connected in parallel with it in a switched capacitor circuit.
REFERENCES:
patent: 4179665 (1979-12-01), Gregorian
patent: 4210872 (1980-07-01), Gregorian
Cannon Russell A.
Gensler Paul L.
GTE Automatic Electric Laboratories Inc.
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