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Low noise constant current source for bias dependent noise measurements
D Talukdar1, R K Chakraborty, Suvendu Bose
1Saha Institute of Nuclear Physics, Kolkata, India. deep.talukdar@saha.ac.in
Abstract:
A low noise constant current source used for measuring the 1∕f noise in disordered systems in ohmic as well as nonohmic regime is described. The source can supply low noise constant current starting from as low as 1 μA to a few tens of milliampere with a high voltage compliance limit of around 20 V. The constant current source has several stages, which can work in a standalone manner or together to supply the desired value of load current. The noise contributed by the current source is very low in the entire current range. The fabrication of a low noise voltage preamplifier modified for bias dependent noise measurements and based on the existing design available in the MAT04 data sheet is also described.
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