Dual mode negative voltage switching

Details Dual mode negative voltage switching Dual mode negative voltage switching

2005-03-01

2009-08-04

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

Reexamination Certificate

active

07570466

ABSTRACT:
A negative switch may enable switching of two different negative voltages. The switch may include a negative cascode bias generator which biases the gate of a cascade protection device. When the negative switch is passing a large negative voltage, the bias generator generates a lowered voltage to provide a cascade voltage for snapback protection of a passing transistor. When a relatively low negative voltage is to be switched, the bias generator may produce a positive voltage greater than the threshold voltage of the cascode protection device so that both high and low negative voltages may be switched by the same circuit without exposing the passing device to a voltage in excess of its snapback limit.

REFERENCES:
patent: 4967103 (1990-10-01), Dikken et al.
patent: 6014041 (2000-01-01), Somasekhar et al.
patent: 6809386 (2004-10-01), Chaine et al.

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