PURPOSE: To eliminate the need for a compensation circuit reducing an offset voltage by splitting MOS transistor(TR) into plural numbers so as to receive a same current density and connecting the side of the source whose diffusion area is smaller to a capacitor.
CONSTITUTION: The MOS TR of an analog switch is split into two vertically so that the current density is entirely the same and they are connected in parallel. An input terminal in is connected to a metallic electrode 7, the electrode 7 is split into two vertically and they are connected to each diffusion area 3 of the source side via a contact 6. Furthermore, the diffusion area 3 of the source side is connected to a metallic electrode 9 via a contact 8 in common to an area 4. Then the electrode 9 is connected to a capacitor c1 and the smaller area in the areas 3, 4 is connected as the source. Then the area 4 of the source side is decreased and connected to the capacitor c1 without change of the size of the TR and the offset voltage of the switch capacitor circuit is reduced so as not to eliminate the need for any correction circuit.
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ICHIKAWA KOJI
ISHIHARA HIDEAKI
