OrCAD/PSpice Question

What is the best way to get input and output impedance of a two-port network
using OrCAD/PSpice?
I was just curious if there was a more direct way than what I've been
doing-- exciting the input with a 1Vac signal and dividing that by the input
current. Seems to me they should have a "special button" for getting the
impedances directly...??
Thanks,
Jason
Reply to
Jason Dugas
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What can be more direct than that?
The AC source (call it VIN) has unity value, thus the following applies...
Y = REAL(-I(VIN)) + j*IMAG(-I(VIN))
(PSpice uses R=REAL and IM=IMAG, but I made macros that are more readable.)
Another useful macro that I made is:
CAP = IMAG(-I(VIN))/(2*pi*Frequency)
I also have macros for resolving capacitors with series losses if anyone is interested (like MOS capacitors).
...Jim Thompson
Reply to
Jim Thompson
[snip]
[snip]
Make that IMG=IMAG
...Jim Thompson
Reply to
Jim Thompson
hmm, perhaps I'm just spoiled by other software packages. I figured it would be such a common need that someone might have built in a way to "automatically" do it.. Thanks.
Jason
Reply to
Jason Dugas
One can simply id a source to tell the simulator to automatically calculate V/I and plot impedance. I am aware of at least one simulator that does this:-)
Kevin Aylward snipped-for-privacy@anasoft.co.uk
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a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design.
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Kevin Aylward

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