Dear Sir,

I used the ATF54143 PHEMT transistor LINEAR for S-parameter simulation and Nonlinear transistor for DC bias and linearity checking. I connected the transmission line MLIN at the source of the LINEAR ATF54143 transistor with W=0.4mm and L=0.4mm for generating S-parameter and stability. But when we go for choosing NONLINEAR ATF 54143 transistor for getting linearity and DC bias checking, it has two sources , both are internally connected. What values of MLIN we need to connect at the two ends of the sources of the NONLINEAR ATF54143 transistor, when LINEAR transistor source MLIN value W=0.4mm, L=0.4mm.Because transmission line is distributed element.

I used the ATF54143 PHEMT transistor LINEAR for S-parameter simulation and Nonlinear transistor for DC bias and linearity checking. I connected the transmission line MLIN at the source of the LINEAR ATF54143 transistor with W=0.4mm and L=0.4mm for generating S-parameter and stability. But when we go for choosing NONLINEAR ATF 54143 transistor for getting linearity and DC bias checking, it has two sources , both are internally connected. What values of MLIN we need to connect at the two ends of the sources of the NONLINEAR ATF54143 transistor, when LINEAR transistor source MLIN value W=0.4mm, L=0.4mm.Because transmission line is distributed element.

By the way the size of the 'transmission lines' you are currently suggesting look far too small to be doing anything useful alongside of packaged parts on a PC board design. That size is no bigger than the tabs on the transistor package itself so much more 'transmission line' would be required just to complete the physical connections, see SOT434.png. Even a via to any ground plane on the backside of the board would be longer.