z domain simulation in spectre

[ebers-moll]

Hi,

I am currenly working on a SC filter circuit. I am verifying the
performance of the circuit (transistor level) by plotting the transfer
function in MATLAB. However, I want to simulate the z-domain transfer
function by using spectre. Thus, I am planning to eliminate MATLAB.
First of all, I defined the z domain function by using veriloga. But
I could not manage to simulate this behavioral block by using Spectre.
To the my knowledge, pac can not be used in these situations. So, what
can I do ?

Thanks in advance

ebers-moll