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I’m running LTspiceXVII under macOS in a WineCX container. I find that entering {} | symbols which are reached by ALT-8, ALT-9 ALT-7 (german keyboard) is not possible. I can copy/paste the symbols

Yes, well, I have my own ideas about the Uncertainty Principle, but I am not sure whether they are right. Of course, you don't know if the cat is dead until you look, but that doesn't mean it wasn't

... that the cat remains both alive and dead until the state has been observed. Tim

Hahaha!? I'd say that depends on which side of the argument you were on.? I think it may also date from before that in slightly different form as "care killed the cat".? Shakespeare is supposed to

The first line dates from 1868. The second was added in 1912. It is not an improvement. ====================================================================================== Best wishes John Woodgate

If I may chip in here and finish the little ditty you started with the rarely known second line John: "Curiosity killed the cat, but satisfaction brought it back!"

Some transistor models are very far from real behavior. Nobody checks that. What bothers me is that ADI violates the SPICE rule that model names must be unique. And nobody at ADI seems to care.

very much appreciated this warning. A useful community service... ________________________________ Sent: Saturday, July 8, 2023 5:18 AM To: [email protected] <[email protected]> Subject: Re: [LTspice]

Thank you for the explanation. Much appreciated.

Perhaps it's as well I'm a bit of a dog, then. -- Regards, Tony

Yes, I did mean 'will'. My (limited) experience is that even different data books don't give the same graphical data, and models are no different in that respect.? Yes, you can tweak a model, but

I say 'fictitious', because no such signal with that waveform was the input for the simulation.? I agree that the result of the inverse FFT is the impulse response (within limitations). There is

I presume you meant "It's unlikely that a model "will* produce curves that closely match those in the data sheet"? Of course that's not true. In many cases, you can tweak a model to almost overlay

John wrote, "... an inverse FFT will produce a (fictitious) waveform whose spectrum is the frequency response. I can't see much use for that. "? It might be useful to see the impulse response of your

The output from an .AC simulation is a high-resolution spectrum, so indeed an inverse FFT will produce a (fictitious) waveform whose spectrum is the frequency response. I can't see much use for that.

That's not a huge undershoot, not compared to the pulse itself.? The undershoot is -125 mV and it lasts for less than 10 ns.? If you made the I1 pulsewidth wide enough so that the op-amp's output

Hi Andy. Thank you for your feedback. When I mentioned that I was not seeing what I expected at the output of the TIA, I should have been more precise. I am not sure I understand why there is so much

Going back to this discussion adding another tidbit: If you run an .AC analysis, and then do a View > FFT, LTspice will gladly perform an (inverse) FFT on the frequency-domain output from the .AC

No doubt you can carry out an optimization, but it requires a deep knowledge of what each of the model's parameters determines, which is far from straightforward. It's unlikely that a model with

Good stuff. For accurate model assessment and optimisation, I also have a method of importing the datasheet data into LTspice for direct comparison. It's this latter bit that's onerous, because it