I agree entirely. Now I want to explore the results of .FOUR with the FFT values. On 2023-08-12 19:28, Andy I wrote:

Tony mentioned the "Waterfall plot" in relation to loudspeaker testing. I have not seen them for loudspeaker testing, but I've seen waterfall plots with many radio communications receivers, and audio

Marius, I am still mystified why the two FFTs differ so much, but I figured out part of it. It looks as if they both took the FFT of the same quantity, even if it was the wrong thing to be looking at.

On Mon, Dec 19, 2022 at 10:00 PM, Andy I wrote: I guess this was an omission in LTspice, the fact that it works one way but not the other. I suggest you should report this error of omission to ADI so

Hi, Vlad: Thank you, it's really helpful. Such powerful models. And, yes, my tool mentioned was using that 'Butterworth' of IIR & 'Equiripple' of FIR, such more orders and sections of '253' & '88,44'.

Thank you for the info, Andy!

Thank you Donald

Jim wrote, "I think you mean A*sin(omega*time)" Duh! (smacks side of head) Of course! Dummy me. Brain ... not ... working. Andy

I have PC version running on Mac under Parallels in Windows 10 and FFT works like it supposed to as described in your email. This is not the case on Mac. In Mac version if I want to add a waveform it

Hi, Vlad: Thank you for your opinions, for numerical analysis, I admire Matlab is very powerful. But while talking about feedback diagram, I am not sure... Maybe there are many tools which provides 'f

You want to sweep the input voltage level and plot the THD at the output? You can't do that directly, but you can do it with your own 'add-in, which is a notch filter for 1 kHz. LTspice allows you to

James, In the FFT, 0 dB corresponds to 1.414 V peak, not 1 V. Therefore you need to scale your signal to 1.414 V (1.0 V RMS). You can also scale your signals in the waveform plot window after the FFT

Interesting. That is hidden (not visible) in my view. Arrgh. Cander: Your version is nearly 2 years old. Time for an update. This problem with the FFT was a known problem already. It was fixed in Nove

ak za wrote: "i did what you had say. when the diodes are there, all things are ok. but after eliminating them, in log file the below massages are written: measurement "Period" FAIL'ed measurement "Fr

Vlad, I wasn't suggesting any disagreement. I merely meant to convey that I made some arbitrary choices (that may not have been optimum) because time was constrained. Your suggestion make sense. But w

Hello MDM, I forgot to mention that you should turn off data ompression for good results and you should specify a small time step in .TRAN. .options plotwinsize=0 Helmut

How to find FFT: 1) Run a .TRAN simulation. 2) Plot a waveform. 3. Go to the plot window, then right-click > View > FFT. At this point you have a pop-up window. To start with, just accept all the defa

Hi Helmut Sennewald Yes, that is the point that I need, finally, I can plot the curve in Matlab. Thank you so much. Thanks, everyone for your help. Thanks and, Best regards! Tin