NMOS switches resistance in N-Path filter

Hi guys,

I am now designing an N-path filter following the paper "Tunable High-Q N-Path BPF: Modeling and Verification" of Amir Ghaffari as my final project. In the specification, the switch resistance is 100 Ohms. Voltage swing through the switch is +-200mV. Can somebody have me how to measure the switch resistance using Cadence Virtuso?

Thank you very much!