Patent ID: 7196379

Claim:
A semiconductor device having MOS transistors which function as capacitors, the device comprising: an n-channel MOS transistor a gate of which is connected to a terminal on a high potential side wherein a first MOS capacitor is formed; and a p-channel MOS transistor a gate of which is connected to a terminal on a low potential side wherein a second MOS capacitor is formed, wherein the first and second MOS capacitors are connected in series, source/drain regions of the n-channel MOS transistor and source/drain regions of the p-channel MOS transistor are electrically connected, parasitic diodes formed between the source/drain regions of the n-channel MOS transistor and a substrate region thereof and parasitic diodes formed between the source/drain regions of the p-channel MOS transistor and a substrate region thereof are electrically connected, the substrate region of the n-channel MOS transistor is connected to a terminal on the low potential side, and the substrate region of the p-channel MOS transistor is connected to a terminal on the high potential side, and a direct current path from a high-potential-side terminal through the parasitic diodes of the n-channel MOS transistor and the parasitic diodes of the p-channel MOS transistor to a low-potential-side terminal is formed.