Does s-parameters include component leads? If is, to which point?

Status
Not open for further replies.
T

Terminator3

Advanced Member level 3
Joined
Feb 25, 2012
Messages
802
Helped
71
Reputation
142
Reaction score
63
Trophy points
1,308
Activity points
9,027
For example, to smd pad center, or to lead edge?
 

They may or not.
Depends on the manufacturers measurment set-up and technique.Some mfgs give s-parameters without package (die only) and then they add a package model to be bind.
 
What about CEL NEC NExxxx in plastic package and ATFxxxx?
It looks that for NEC's S parameters given from chip center, not from leads. I examined parallel feedback oscillator with microstrip resonator, and it seems that feedback microstrip loop lenght = exactly inverse of S21 angle (more or less 1deg) at frequency of oscillation
So if S21 angle is -100deg
then feedback loop microstrip length is N*360+100 deg.
If i calculate line lenght from FET leads, it gives wrong phase relation: 14deg differs from S2P data.
 
Last edited:

Pckage parasitics should added manually to die model.You can not define package parasitic components by trying particular circuit behaviour.
 
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…