Importance

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Abstract

A power switching circuit solves a problem associated with conventional power switching circuits. It has been difficult to achieve positive power switching for the operation of low threshold transistors using a voltage below the forward voltage drop of a diode. The difficulty arose because the P-channel transistors on the unselected side of the power switching circuit could not be cut off completely. A power switching circuit according to the present invention includes a power switching portion and a level shifter. The power switching portion includes a first series circuit of two P-channel transistors connected in series across a first input terminal and an output terminal. A second series circuit of two P-channel transistors connected in series is connected across a second input terminal and the output terminal. A level shifter brings the first series circuit into conduction and takes the second series circuit out of conduction in response to the control signal.

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First Claim