The CISS parameter of MOS tube refers to its input capacitance, which represents the input capacitance of MOS tube in actual use. Input capacitance refers to the amount of charge required by the MOS tube under the change of the input signal, and the larger it is, the less sensitive it is to the change of the input signal. CISS parameters have an important effect on the performance and application of MOS tube, so it is necessary to consider the size and variation range of CISS parameters when selecting and designing MOS tube circuits.
Generally speaking, the CISS parameter of MOS tube increases with the increase of voltage, so it is necessary to fully consider the change of its CISS parameter when selecting MOS tube.