Negative voltage clamp

Details Negative voltage clamp Negative voltage clamp

1989-05-01

1990-05-15

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072964, 307560, 307564, H03K 508

Patent

active

049260731

ABSTRACT:
A negative voltage clamp circuit is coupled to an N-epi region within an IC for clamping the voltage applied thereto to a predetermined negative value without utilizing a negative power supply. A current supply provides a first current through a series combination diode and resistor such that a voltage is developed across the resistor. The base of a first transistor receives drive current from the current supply for providing a second current flowing through its collector-emitter conduction path. The first and second currents respectively flow through the collector-emitter conduction paths of second and third transistors which are configured as a cross-coupled pair. The base-emitter junction of the third transistor is responsive to an applied voltage for gating an appropriate magnitude of the second current to the output for limiting the applied voltage to a predetermined value approximately equal to the voltage developed across the resistor.

REFERENCES:
patent: 3898482 (1975-08-01), Holt, Jr.
patent: 4027177 (1977-05-01), Davis
patent: 4345171 (1982-08-01), Harris, Jr.

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