Dual sourced voltage supply circuit

Details Dual sourced voltage supply circuit Dual sourced voltage supply circuit

1995-08-31

1998-02-17

Berhane, Adolf

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

365726, 307 80, G05F 156, G11C 1300

Patent

active

057194904

ABSTRACT:
A dual sourced voltage supply circuit for use with a flash EPROM or the like and comprising output voltage circuitry including an input for receiving a control signal determining which of two voltage supplies is used to provide an output of the dual sourced voltage supply circuit. The output voltage is provided by one of the two voltage supplies by means of a controllable conductive path connected between one voltage supply and an output node of the circuit. Such controllable conductive path comprises, in series, a first MOSFET transistor connected to the voltage supply and a second MOSFET transistor connected to the output node, both transistors are of the same conductivity type and are arranged to be activated in dependence on the input of the output voltage circuitry; moreover, each transistor has a body connection connected to a respective channel electrode; the body connections are arranged to prevent charge injection occurring between the other channel electrode of the same transistor and the body of the second and first transistor respectively.

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