1I'm using class 2 medical graded SMPS in our device. So earth connection not recommended. When connecting SMPS to load (contains capacitive touch LCD), touch function is affected by SMPS noise. When connecting SMPS earth point to protective earth, LCD touch function working properly.
I don't want to use earth connection because of class 2 constraints. I want to bypass that noise. I have added few decoupling ceramic capacitor at touch input supply to avoid high frequency noise to touch input. Still am facing issue.
Can anyone give me some idea to overcome above issue ?