Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1983-04-20
1985-09-24
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
328167, 330 51, 330109, H03H 1112
Patent
active
045435464
ABSTRACT:
A circuit for monolithic or film stratum is adapted to have circuit capacitances integrated therein and having a minimum unit capacitance (MUC), or smallest practical capacitance that can be fabricated therein. Circuits are provided that have in one circuit arm a capacitor having a first capacity and in a second circuit arm a number N of series connected switched capacitors having a second or terminal capacity, or effective capacity between the end terminals of the second arm, that is less than the first capacity. The first capacity and second capacity form a ratio R, which is the factor by which the first capacity is greater than the second capacity. Switching is provided for each plate of each of the series connected capacitors and at the end terminals of the second arm to alternately connect the second arm into the circuit and to discharge the series connected capacitors which minimizes the effects of parasitic capacitances. Each series connected switched capacitor of the second circuit arm may have a capacity of substantially one MUC so that the terminal capacity of the second circuit arm is (1/N) MUCs and the first capacity is (R/N) MUCs. The total capacitance, or circuit capacitance, that is integrated into the stratum is (N+R/N) MUCs. N is selected to reduce or minimize the circuit capacitance and thus correspondingly reduce or minimize the integrated stratum area, reducing cost and size of the integrated stratum area for a given circuit.
REFERENCES:
patent: 4366455 (1982-12-01), Berger
patent: 4441080 (1984-04-01), Saari
Briody Thomas A.
LaRoche Eugene R.
Lee Benny T.
Magnavox Government and Industrial Electronics Company
Seeger Richard T.
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