Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1985-04-29
1987-09-01
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328127, 307520, 307521, H03K 500, H03B 100, H04B 110
Patent
active
046911715
ABSTRACT:
A first resistor (R.sub.1) and a first capacitor (C.sub.1) constitute a filter arrangement having a time constant which is not very accurate due to the inaccuracy of the resistor and the capacitor values in integrated circuits. The time constant is adjusted using a circuit comprising a reference resistor (R.sub.2) and a switched capacitor (C.sub.3). The value of the reference resistor (R.sub.2) and the equivalent resistance of the switched capacitor (C.sub.3) are compared by means of an integrator (C.sub.2, 2) from whose output (9) a control voltage is taken via a hold circuit (C.sub.4, C.sub.5). The control voltage is equal to the voltage at that point on the reference resistor where the resistance value is equal to that of the switched capacitor (C.sub.3). By means of comparators (21 to 30) and switches (S.sub.11 to S.sub.20) a percentage of the total resitance of the first resistor (R.sub.1) is short-circuited. This percentage is equal to the difference between the resistance of the reference resistor (R.sub.2) and the equivalent resistance of the switched capacitor (C.sub.3), expressed as a percentage of this equivalent resistance.
REFERENCES:
patent: 3070762 (1962-12-01), Evans
patent: 3715680 (1973-02-01), Flerscher
patent: 3760289 (1973-09-01), Hurtig, III
patent: 3787778 (1974-01-01), Carre et al.
patent: 3824501 (1974-07-01), Harris
patent: 4114117 (1978-09-01), Ford
patent: 4132957 (1979-01-01), Hekimian et al.
patent: 4392068 (1983-07-01), Welles, III
Coppelmans Petrus M. C.
van Roermund Arthur H. M.
Callahan Timothy P.
Franzblau Bernard
Mayer Robert T.
Miller Stanley D.
U.S. Philips Corporation
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