Resistor value variation on TSMC 0.18um Technology Process and PRA

Hello to everyone,

currently I'm designing an active RC filter, it is a CR-RC2 Pulse Shaper. The technology process is TSMC 180nm (Link: **broken link removed**).

I have to implement the resistors of my filter. It is known that their values cannot be accurate defined due to process variation. That's why I want to implement a Programmable Resistor Array (PRA - just simply as resistors and CMOS switches) for each resistor of my filter. The problem is that I don't know a priori how much variation I can expect from the process. I need to know this in order to design the PRA.

Should I be concerned in anything else when designing the PRA? Can anyone suggest me a proper and different way to make my filter tunable?

This is my filter schematic:

If the Foundry has supplied a PDK with Statistical Information, you can find how much your circuit will be impacted.
A Monte-Carlo simulation will give you an insight..