For some nano-physics related measurements, a very clean low-noise bias current is required. People mostly use a battery powered isolated voltage source along with a big resistance similar to this.
Is there anyway, alternatively I can have a clean source using a regular voltage source, let's say a Keithley DC power supply, and an off-the shelf filter to clean it up?
Any recommendation for the filter?
Appreciate your responses.
I would like the noise to be in the order of 10 μVrms (1kHz bandwidth), similar to the device above. By recommendation: I mean what to search for. Is there any technical term for these types of filters.