| abstract |
A capacitor is provided that can function as a capacitor when an AC voltage is supplied without increasing the semiconductor device manufacturing step. A transistor is used as the MOS capacitor, where a pair of impurity regions formed on both sides of the channel formation region are each doped with impurities of different conductivity to be used as source regions or drain regions. In particular, in the case where the channel forming region is interposed between the N-type region and the P-type region, assuming that the impurity region doped with the N-type impurity is an N-type region and the impurity region doped with the P-type impurity is a P-type region, There is provided a transistor used as a MOS capacitor.n n n n Capacitors, transistors, semiconductor devices, integrated circuits, impurity formation regions |