title: Low noise constant current source for bias dependent noise measurements.
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.
authors.affiliation: Saha Institute of Nuclear Physics, Kolkata, India. deep.talukdar@saha.ac.in
authors.forename: D
authors.initials: D
authors.lastname: Talukdar
authors.forename: R K
authors.initials: RK
authors.lastname: Chakraborty
authors.forename: Suvendu
authors.initials: S
authors.lastname: Bose
authors.forename: K K
authors.initials: KK
authors.lastname: Bardhan