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A low noise constant current source used for measuring the $1/f$ noise indisordered systems in ohmic as well as non-ohmic regime is described. Thesource can supply low noise constant current starting from as low as 1 $\mu$Ato a few tens of mA with a high voltage compliance limit of around 20 Volts.The constant current source has several stages which can work in a standalonemanner or together to supply the desired value of load current. The noisecontributed by the current source is very low in the entire current range. Thefabrication of a low noise voltage preamplifier modified for bias dependentnoise measurements and based on the existing design available in the MAT04 datasheet is also described.

Low noise constant current source for bias dependent noise measurements