What type of touch pad?
Capacitive?
Resistive?
Single button?
Multiple buttons?
Smartphone type touch screen?
How are you sensing the touch: generating a signal that is passed through the touch back to the pad or sensing ambinet noise and mains hum?
Please give us a bit more information about your application to guide our advice to you.
:)
In the meanwhile, you may get some clues from this:
http://doras.dcu.ie/20201/1/MastersCorrectionsFinal.pdf
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