For Problem 10.4, section 'c', we must verify that our input filter satisfies the conditions of section 'b'.
Verifying the attenuation of the filter over frequency to see gain at 200kHz is simple. However to verify the impedance conditions, different AC sources and circuit schematics must be used to plot each of Zo, Zd and Zn (or am I wrong about this?).
Given three different sim schematics and simulation runs, how does one overlay a plot from each of three different sims onto one display window for relative comparison of results?
Is creating three independent plots the only way to view these impedances? That would be extremely cheesy and I assume LT Spice isn't that poor a tool so this must be user error/ignorance.
Any assistance would be appreciated.
Thanks,
Colin
I have figured out an asinine way to work around this. Put all schematics into one large schematic with all different/renamed nodes. Now all graphs can be superimposed.
ReplyDeleteThere must be a better way... any ideas?
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ReplyDeleteThis bugged me as well.
ReplyDeleteWithin LTspice, if you go to Help/Contents/F.A.Q/Exporting Waveform Data, there is a reference to a 3rd party utility that will merge waveforms from different simulations. The program (Ltsputil.exe) runs from a windows command line and works well once you get the hang of it. That said, your work-around sounds easier for small circuits.
Good information to have.
ReplyDeleteThanks Dave.