Dear Sourav,

I think it can be input as a sampled waveform say V[n] as an arbitrary or random signal generator. You can input it as a test vector. please follow the link:http://optics.eee.nottingham.ac.uk/wiki/Cadence_Waveform_Import_and_Export

best wishes

You can use the vpwlf source from analogLib and in the PWLfilename field you select the path for your "file.dat" file generated in Matlab.

Save the Matlab data in .CSV format then take a vsource where select the type as pwl and give the file location..

The input value and time axis both value must be formated upto a large digits for the accuracy