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A MOS CAP is basically a transistor without the DRAIN and SOURCE connections. This means that it has a GATE connection and a BODY seperated by a thin layer of insulating oxide, therefore, a CAP.
The operation of the moscap is illustrated by the image from wikipedia.
A capacitor is formed when two conducting layers are separated by a dielectric layer. In MOS, we have semiconductor (substrate) and Gate are separated by oxide layer. The value of MOS capacitor depends on the region of operation. See the link below:
Thanks for your replies.I have some confusions in accumulation depletion and inversion modes. Why depletion region is wide at high frequency? What is the effect of low frequencies?
Please give some explanation.