Numerical simulation results of noise due to current fluctuations along an n+−n−n+ submicron structure are presented. The mathematical framework is based on the
interpretation of the equations describing electron transport in the semiclassical
transport model as stochastic differential equations (SDE). According to this formalism
the key computations for the spectral density describing the noise process are reduced to
a special initial value problem for the Boltzmann transport equation (BTE). The
algorithm employed in the computation of the space dependent noise autocovariance
function involves two main processes: the stationary self-consistent solution of the
Boltzmann and Poisson equations, and a transient solution of the BTE with special
initial conditions. The solution method for the BTE is based on the Legendre
polynomial method. Noise due to acoustic and optical scattering and the effects of nonparabolicity
are considered in the physical model.