Wave transmission lines and networks – Negative resistance or reactance networks of the active type
Patent
1981-05-21
1983-03-01
Gensler, Paul L.
Wave transmission lines and networks
Negative resistance or reactance networks of the active type
328128, 328167, 330107, 333217, H03H 1140
Patent
active
043756255
ABSTRACT:
An integratable circuit that simulates a source resistor comprises first and second nodes for connection to a voltage source and a virtual ground, respectively; a first integrated capacitor C1; and switch means operative for alternately electrically connecting C1's top and bottom plates to the first node and ground, respectively, and to ground and the second node, respectively, during first and second non-overlapping time periods in each time interval T for charging C1 to the source voltage and discharging C1 into the second node, respectively, where T is the time interval between adjacent second time periods and f=1/T is the switching frequency for C1. The switch means also operates for making similar connections to plates of second and third capacitors C2 and C3 in different time periods of ones of successive time intervals T, both C2 and C3 sampling a source voltage in synchronism with sampling by C1 during adjacent time intervals and holding a charge voltage for a time interval T prior to being discharged into the second node. The circuit simulates a source resistor when the first node is electrically connected to the output terminal of a voltage source that is connected to ground. This circuit configuration simulates a bilinear source resistor when the capacitances are the same values and the circuit is characterized by the bilinear transformation.
REFERENCES:
patent: 4179665 (1979-12-01), Gregorian
patent: 4315227 (1982-02-01), Fleischer et al.
patent: 4331894 (1982-05-01), Gregorian et al.
patent: 4333064 (1982-06-01), Kato et al.
patent: 4352069 (1982-09-01), Dessoulavy
Lee, Improved Circuit Elements for Switched-Capacitor Ladder Filters, Electronics Letters, Feb. 14, 1980, vol. 16, No. 4, pp. 131-133.
Cannon Russell A.
Gensler Paul L.
GTE Automatic Electric Laboratories Inc.
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