Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1974-12-17
1976-01-06
Robinson, Thomas A.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307241, H04Q 352
Patent
active
039314758
ABSTRACT:
In an electronic switching device for use as the switching component of a switching network in a telephone central office, the device being composed of a switching transistor connected in series in the signal conduction path for switched signals and a controllable impedance connected in a shunt branch, the switching transistor, in its conductive state, having a low series resistance and an associated high shunt resistance, and, in its blocking state, having a high series resistance and an associated low shunt resistance, the shunt branch is composed of a control transistor having a control voltage applied to its base, having its collector connected to the base of the switching transistor, and having its emitter connected to the switching transistor through a resistor to constitute a feedback path for the switching transistor, a voltage-dependent resistor connected to the base of the switching transistor, and suitable sources of operation voltages, the voltages and characteristics of the voltage-dependent resistor being selected to be such that when the switching transistor is conductive, the control transistor operates conductively in its active region and the voltage-dependent resistor presents a high resistance and when the switching transistor is blocking the control transistor is also blocking and the voltage-dependent resistor has a low resistance and supplies to the base of the switching transistor a voltage which maintains the switching transistor blocking.
Bachle Erich
Kliem Helmut
Rall Bernhard
Licentia Patent-Verwaltungs-GmbH
Robinson Thomas A.
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