| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an analog switch circuit having superior withstand voltage and capable of being operated at high speed under a low power voltage. <P>SOLUTION: The analog switch circuit is provided with a comparator circuit 200 inputting an analog input signal input to an analog switch section 100 and a reference signal for comparison. A step-up circuit 300 forms the gate potential of an NMOS transistor NM1 constituting the analog switch section 100 to the potential of a positive power voltage when the input potential of the analog input signal is lower than the reference potential of the reference signal and steps-up the gate potential to a potential higher than the potential of the power voltage when the input potential is higher than the reference potential. <P>COPYRIGHT: (C)2004,JPO |
