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SNR measurement realities for capacitive touchscreens | Cypress Semiconductor

SNR measurement realities for capacitive touchscreens

Last Updated: 
Oct 08, 2013

Author: Patrick Prendergast

Touchscreen controller manufacturers often cite an array of varying specs and metrics to help their products stand out from others.  One of those frequently-mentioned differentiators is signal-to-noise ratio (SNR). However, even if the numbers are impressive, that doesn’t necessarily mean SNR is a good indicator of system performance in the presence of noise. This article will discuss what SNR is, how it is calculated, it really means to your system’s performance, and alternative metrics that better represent touch performance.