Impact of noise temperature constant and diffusion coefficient on the minimum noise figure and minimum noise temperature of InAlAs/InGaAs DGHEMT

In this paper, the impact of noise temperature constant (δ) and diffusion coefficient (D) on the noise performance of InAlAs/InGaAs DG-HEMT is studied using charge control based model. The noise temperature constant (δ) is observed to have a significant effect on the minimum noise figure (NF
_min
) and minimum noise temperature (T
_min
) over the entire range of drain current whereas the effect of D on NF
_min
and T
_min
is observed to be prominent mainly at high values of drain current where the diffusion noise dominates.