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Re: FFT Resolution

 

Hello Ron,

If you want 100Hz resolution, you have to simulate at least 1/100s=10ms.

I have uploaded an example "fft10meg.asc" to the Temp-folder folder. I simulated 20ms.

http://groups.yahoo.com/neo/groups/LTspice/files/%20Temp/

Run the simulation. Then in the FFT dialog window choose 4194304 samples.

Please be aware that the FFT/DFT only looks so perfect because my second source has 100Hz offset which exactly fits to the FFT's frequency resolution. If this is not the case, one would try with a window function to get a good resolution.

Best regards,
Helmut
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