Question: How to calculate SNR in db?
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: