SEMICONDUCTOR DEVICE AND METHOD OF CONTROLLING ANALOG SWITCH

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor device having an analog switch appropriately operating in response to an input signal having a high voltage.

SOLUTION: A semiconductor device has: an analog switch having a P-channel transistor and an N-channel transistor connected in parallel between an input terminal and an output terminal; a variable voltage circuit variably generating respective potentials of a first gate voltage and a first back gate voltage of the P-channel transistor and a second gate voltage and a second back gate voltage of the N-channel transistor, depending on an input voltage applied to the input terminal; and a control circuit supplying to the variable voltage circuit a control signal for controlling the analog switch to a conductive state or a non-conductive state. The variable voltage circuit outputs the variably-generated first gate voltage and second gate voltage to the gates of the P-channel transistor and the N-channel transistor respectively, in response to the control signal for controlling to the conductive state.

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