| 摘要 |
PURPOSE:To eliminate the on/off noise of a switch by adopting the circuit constitution that an electric charge amount due to a gate-bulk capacitance and other parasitic capacitance of a switch line is cancelled. CONSTITUTION:When a single P-channel transistor is used as an MOS analog switch, the 2nd analog switches 7, 8 are connected to both the source and the drain of the 1st MOS analog switch 6, and the gate of the 2nd MOS analog switch is driven by a clock with the phase reverse to that of the gate drive clock of the 1st MOS analog switch. The gate area of the 2nd MOS analog switch is formed as an area so that the same electric charge as the electric charge discharged or sucked to the signal line is obtained when the gate of the 1st MOS analog switch is driven.
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