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1st July 2011, 07:45 PM
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#2 | |
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diyAudio Member
Join Date: Oct 2004
Location: Aalborg, Denmark
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Quote:
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2nd July 2011, 01:09 AM
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#3 |
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diyAudio Member
Join Date: Oct 2008
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Not a graph, but a start
Here's a file...maybe you've already done this, in which case, my apology for the redundancy. A typical kind of amp, and I sweep the drive level. If you look in the Spice error log file (view=>spice error log), you see the output distortion.
I know you wanted a graph, but maybe this is a useful stop along the way. unzip the model file and the .asc file into the same directory, and run the test case. |
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5th July 2011, 02:21 AM
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#4 |
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diyAudio Member
Join Date: Oct 2008
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Here's that Graph!
The enclosed zip file contains a pdf file that describes what's going on in the enclosed LTSpice files.
In a nutshell, it lets you make plots of THD versus input level in LTSpice. Given this example, you could probably also do THD plots versus frequency, but I haven't tested that. I thought I'd get feedback on the original question first before continuing. I hope this is useful, and clearly enough documented to be understandaable. Feedback is appreciated. Dan |
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5th July 2011, 11:09 AM
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#6 |
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diyAudio Member
Join Date: Nov 2003
Location: Brighton UK
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Hi,
In bob cordell's book he specifically uses LTSpice for distortion simulations. rgds, sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow |
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5th July 2011, 11:51 AM
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#7 | |
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diyAudio Member
Join Date: May 2008
Location: Albany , NY (smallbany)
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Quote:
 I have the level stepped and can see both my fourier and error log total THD , therefore I can see the data I need (below 1). It would be a lot of work just to get a handy (level vs. THD graph).  It seems a shame , as I have the total THD data stepped in the log , that it could not be directly plotted out versus the stepped levels.OS The FFT with multiple steps shows the progression of H2 -9 as output increases , which is still quite useful.
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Mongrel website , always current and updated : http://www.fidelityforce.com/ostripper |
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4th January 2012, 01:40 PM
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#8 |
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diyAudio Member
Join Date: Feb 2008
Location: Denver, CO
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One more link to solution LTSPICE THD Analyzer
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Audio Perfection |
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