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Want to plot impedance over frequency domain (Read 4770 times)
Mo
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Want to plot impedance over frequency domain
Jul 31st, 2003, 1:19pm
 
I used smartspice to simulate a circuit. I am wondering how I can get a plot of impedance over the frequency domain.

Do I need to write any scripts in C++/Java/C simulate the circuit hundreds of times and pick each voltage and current to find the corresponding impedance? If so, how? I will really appreciate any ideas or advance. THanks

Mo
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Mighty Mouse
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Fantasyland
Re: Want to plot impedance over frequency domain
Reply #1 - Aug 1st, 2003, 10:08am
 
Drive the port for which you want the impedance with 1 A current source and perform an AC analysis. Then plot the port voltage. The impedance is V/I, and I is 1, so the magnitude and phase of the voltage will be identical to the magnitude and phase of the port impedance.

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Mo
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Re: Want to plot impedance over frequency domain
Reply #2 - Aug 4th, 2003, 7:09am
 
Thanks for your reply.
But the capacitance/resistance/inductance are dependent to the frequency. Can I still do it with ac analysis? To make it clear, the magitude of some of the resistance, capacitance and inductance are a function of frequency. Thanks.
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Mighty Mouse
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Fantasyland
Re: Want to plot impedance over frequency domain
Reply #3 - Aug 4th, 2003, 2:56pm
 
Sure, just perform an AC analysis where you sweep the frequency. Try it, it is easy.

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Mo
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Re: Want to plot impedance over frequency domain
Reply #4 - Aug 5th, 2003, 6:47am
 
mmmm......but i am not sure how to make the arbitrary value of resistance work....

say one of the resistance is (freq/x+y)...... How can I let the simulator know that freq is the frequency that it sweeps thru? sorrie, i am a newbie....thanks very much
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