Inductance q simulation in ltspice

Thread Starter

Kevil

Joined Jun 28, 2020
127
I am not sure if I simulated correctly the Q = 84 for 1.575 GHz in LTspice for Coilcraft inductance 0402DC 8.2 nF Model libraries for LTspice are here (lower right corner).

The next question is if it is possible to replace the trace expression to plot by function i.e. to define the expression in the schematic and use the function result as the expression to plot. I mean something like:

Q = (V(Vout)-V(n001))/Ix(U1:port2) and as "expression to plot" to use Q only.

Coilcraft_0402DC-8N2.png
 

Attachments

eetech00

Joined Jun 8, 2013
3,107
I am not sure if I simulated correctly the Q = 84 for 1.575 GHz in LTspice for Coilcraft inductance 0402DC 8.2 nF Model libraries for LTspice are here (lower right corner).

The next question is if it is possible to replace the trace expression to plot by function i.e. to define the expression in the schematic and use the function result as the expression to plot. I mean something like:

Q = (V(Vout)-V(n001))/Ix(U1:port2) and as "expression to plot" to use Q only.

View attachment 254243
I think the coilcraft models have an issue with the coding for LTspice.
The laplace statement must contain static params only (besides "s" of course).
In addition, caret (^) character is an XOR function, so they would need to be replaced with ** to specify "to the power of".
 

eetech00

Joined Jun 8, 2013
3,107
Look at this example from the Coilcraft website.

1638762273791.png

The line beginning with G$Rvar1, G$Rvar2 have an incorrect character "^" and should be "**". LTspice produces an "cannot evaluate" message when simulating. Also notice there are only paramaters used in the LAPLACE statement (which is correct).
 
Top