Goal: Trying to measure low-frequency noise such as 1/f noise spectrum from a material
What other people did: apply a DC current source --> take the voltage across the material --> amplify it with a preamp --> into a FFT spectrum analyzer
In my case, the problem is the noise is relatively small compared to the DC component, and the amplifier can easily get overloaded by the DC offset before amplifying the noise to a reasonable level. But if I use a DC block, the low cut-off frequency is still not low enough. For 1/f noise, I would like to measure down to 1 Hz. Can anyone suggest a way of doing it? Thanks.