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I have created a graph that shows the imaginary component of R+Jx. On the right hand side I created the following formula: 1000/2*PI*FREQ*im(ZIN1). With this formula I get no data anywhere. If I remove FREQ, in other words 1000/2*PI*im(ZIN1), the curve is exactly what one would expect.

So does FREQ not work in some formulas? Is there something simple that I am missing?

Thanks for help!

Jim

I have created a graph that shows the imaginary component of R+Jx. On the right hand side I created the following formula: 1000/2*PI*FREQ*im(ZIN1). With this formula I get no data anywhere. If I remove FREQ, in other words 1000/2*PI*im(ZIN1), the curve is exactly what one would expect.

So does FREQ not work in some formulas? Is there something simple that I am missing?

Thanks for help!

Jim

FREQ is an input parameter to be used in frequency dependent models. As a linear analysis runs it updates FREQ at each frequency point.

FREQ has nothing to do with output. Once the linear analysis completes, it creates a dataset with F (the frequency sweep), S (the S-data), and ZPORT (the impedances at the ports at each frequency). The ZIN1 you specify is autocalculated when first used.

So, given a specific linear analysis you would plot 1/(2*PI*F.*im(ZIN1)) (note the use of the .* to multiply two vectors together element by element).

Here's a few lines of equations that work well with Bridge-T (for example).

using("Frequencies_Data")

EqCap=-1/(2*PI*F.*im(ZIN1))

setunits("EqCap","pF")

If you plot EqCap it's the equivalent capacitance. Here line 1 sets the source dataset, line 2 does the math, and line 3 sets up the unit of measure so plots look right.

Mark