Calculation of SNR

Version 1
    Answer:

     

    Question: How to calculate SNR in db?
    Response:
    Decible = 20 log (Signal Amplitude/ Noise Amplitude)

    Consider noise counts are 4 and signal counts are 10.

    SNR(dB)= 20 log (10/4)=7.99dB

    Second  case, consider noise counts are 5 and signal counts are 75.

    SNR(dB)= 20 log (75/5)=23.52Db

    For CapSense application SNR requirement please refer application note available on following link:

    http://www.cypress.com/?rID=2742