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accessing the frequency parameter in an ac analysis

vivkr

I was wondering if it is possible to either access or explicitly set the frequency parameter in an ac sweep. For instance, could I do the following:

Set frequency = ftest

Sweep ftest in an AC analysis and get the frequency response of my circuit

Why do I want to do this? I want to provide frequency-dependent input signals as the final output parameter of interest is very easy to extract this way. A trivial example. If I want to check the capacitance at a node, and apply AC voltage of the form V = 1/(twoPi*ftest), then the current drawn out of this would be just the capacitance. 

Naturally, it is possible to build output expressions while using a standard 1 V ac source. I am just curious as to whether we can set frequency, just as we can set the temperature with a variable in ADE.

The next best thing to setting it with an external variable would be the ability to get hold of the frequency variable. Using "freq" to set my voltages does not work as it gives me an error.

Vivek

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