Two-tone intermodulation distortion simulations in the time domain using a quasi-2D physical pHEMT model

Scaleable two-current low-noise phemt model that predicts IP3

“…Efforts have been paid to improve linearity prediction by incorporation of low-frequency dispersion effects or distributed parasitics. [3,4,6,7]. But they are not relevant to our case where dispersion alone could not address high-order nonlinearity and our frequency is not high, lower GHz range.…”

“…I dc =I 1 *E*exp(-C*dT)*tanh(αVds) I 1 =Imax/2(1+tanh(P(Vg')))(1+κVd) P(Vg')=β(Vg'-Vgm)+p2(Vg'-Vgm) 2 +γ(Vg'-Vgm) 3 + p4(Vg'-Vgm) 4 E=1/(1+exp(-2(Vg'-Vp)/dV)) n Vg'=Vg+λVd dT=Idc*Vdc*Rth (To+dT) where Imax, α, Vgm , κ, β, p2, γ, p4, Vp, n, dV, λ are the DC related model parameters. Most of parameters and extrinsic Rs/Rd are the function of junction temperature.…”