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Get X-value from an expression that plots Frequency vs. Vtune

HoWei

In Assembler I am running a VCO in a transient simulation. I sweep the design-variable Vtune (0:0.5:1.5) --> 4 simulation points.

For each of these 4 different simulation pointss I calculate the frequency when the VCO is in steady state - thus I get 4 frequency values--> one frequency value per Vtune-voltage

This allows me to plot Freq vs. Vtune.

Now, from this plot/curve I want to interpolate the Vtune which is required to achieve e.g. Freq=480MHz.

Basically I need a "xval( signal y-val )", but it does not exist.

I tried "cross()" - but it requires a time dependend signal

I tried "xval()" - but it does not give the x-val for a specific y-val

How can I do that ?

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