ABSTRACT
Noise is defined as the random fluctuations of a physical quantity. In
electronic devices, this quantity is the voltage and/or the current at
any port of the device. In general, the random nature of this inherent
noise comes from the thermal motion and intrinsic properties of the
building blocks of solids, such as the generation and recombination
of carriers, the discreteness of the current, the existence of deep
traps or the influence ofmagnetic fluctuations on electron transport.
Measuring noise gives information on the properties of the system
that are often not accessible by other techniques. Besides, noise is in
general a figure of merit of a device, as it determines the noise floor
and thus the signal to noise ratio (SNR) of a system.
