Hi, please let me know the purpose of having a ferrite bead isolation for ground (between digital and power)? as far as i understand. the ferrites will be helpful in case of power noise filtering. And noise from digital line return path wouldn,t affect the power levels as it might do for analog ground(return path). will the noise from a push button switch within digital circuitry affect my power Ground? will that have frequency? (even though noise) does "selecting a ferrite bead" carry any meaning for this?