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Frequency dependent current source

Dear all,

I would like to implement a frequency dependet AC current source in Orcad Capture. To be exact, the amplitude of the AC current source should have the form f²*A, with A being a constant. So when I do a AC sweep simulation with PSPICE, the Amplitude of the AC current source should sweep together with the frequency.

Sweeping an additonal parameter is not suitable in this case. Is there a part in the libary or a workaround I could use for my problem?

Best Regards,

Felix

oldmouldy over 14 years ago

You could try a LAPLACE part, like a GLAPLACE, an XFORM of "s" will get an output of "2*pi" per Hertz, so an XFORM of "s/twopi" will get an output of 1 per Hertz, an XFORM of "(s/twopi)*(s/twopi)" will get you the square, then complete the multiplication by your constant term. NOTE: normal units for output will be in AMPs and the ABMs have no respect for supply limits, a 1kHz signal will result in an output of 1e6Amps if your constant is 1; into a 1 Ohm load this will result in 1e6V in the circuit....
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felixk over 14 years ago

Hello oldmouldy,
thanks for your reply, it seems to be working out exactly as I wanted it to! Used an AC Voltage source as an input for the GLAPLACE.
Best regards,
Felix
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