I like looking at the FFT plot, and with multitone excitation - THD really doesn't do much for me
I haven't, its interesting but I've to much on the go at the moment to take the time to figure it all out 🙂
no, unfortunately not,
it seems for me too difficult find to downloading it, then put to the right place in ltspice, and then setting those parameters
however I can see that this is very helpful thing!
Could you guys post some example of the FFTs with multi-tone, are you using any particular standard such as SMPTE, CCIF, etc.?
The simplest multi-tone analysis is just two sine waves, frequency shifted so they heterodyne to make a signal with a sine-shaped envelope. This is basically the same thing as a sine-burst signal. Here is a amp test rig I made set up for CCIR.
If you want to do multi-tone analysis you must really remember the "noise floor" in SPICE doesn't mean anything, and it has to be low enough before you will get meaningful results. A high noise floor in simulation indicates the simulator is not set up optimally. This rig attempts to correct that.
If you want to do multi-tone analysis you must really remember the "noise floor" in SPICE doesn't mean anything, and it has to be low enough before you will get meaningful results. A high noise floor in simulation indicates the simulator is not set up optimally. This rig attempts to correct that.
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