Optimization of 1/f noise measurement setup

Abstract

1/f noise has been observed in almost every material. It is the least understood type of noise. There is no general model and theory that explains 1/f noise in different materials, although there are models that describe certain observations or measure- ments in specific materials. In this project, I have tried to experimentally measure 1/f noise in resistors like metal film resistor and wire-wound resistor, using wheatstone bridge implementation and 0-90 o subtraction technique. I have shown the measure- ment improvement of the experimental setup with wheatstone bridge implementation for frequency as low as 15mHz as compared to measurement using four-probe and OFFSET feature of the lock-in amplifier.