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A typical problem with front-end of ADC

Question asked by Jacky_zhou on Jun 15, 2015
Latest reply on Jun 16, 2015 by TonyM
  •      As we know, front-end of ADC needs an amplifier or balun in generally. Our system need to transfer DC and only drive an ADC, so we design a  front-end of ADC by using amplifier. The gain of amplifier is set to 1. Unfortunately, SNR measured with amplifier is lower than  SNR under no amplifier.
  •      Then we consider whether we do not need this amplifier and the input signal is directly transmitted to ADC


I just want to know whether this idea is work.