I am using 90nm fior my circuit to make layout in cadence but the pad shows a capacitor of just 20fF. I tried it after making layout of pad, but it remains the same. Though the interconnecting wires show capacitance but the pad shows no capacitance in the av_extracted. The pad structure is also very different from that in 180nm.

Can anyone please tell me whats wrong, also what is rough pad capacitance value in 90nm.

Thanx in advance.