Hi Naoki-san, Sorry for the delayed response. We had a server issue earlier this week and I was not notified of your first post. Thanks for following up. According to the noise plots the first test case was with an external amplifier with inputs connected to ground. However, on the second noise plot there was no mention of the test signal. Would it be possible to get more information on the circuit (a schematic would be very helpful) and also what is being used for the signal and reference sources in the second test case? At the moment it would seem like the noise is coming from the signal source itself, since it is not seen when the input is disconnected. Additionally, this noise could also be coming from the reference source since reference noise will generally increase with the input signal. Best regards, Chris
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