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Re: Isn't Slew Rate a bit like THD?

Hi,

>Therefore, if you have an open loop bandwidth (dominant pole) of
>1MHz, then you won't have any TIM distortion below 1MHz. However,
>you can have plenty of harmonic distortion that is frequency
>sensitive, due to non-linear cap effects. Is this making sense to
>you?

I thought part of TIM's cause was due to non-linear cap effects...

OK. I could be way off on attributing the effect of the square
wave to TIM. In the papers I've read so far, I haven't come across
anything about TIM not appearing below the dominant pole. If you
know of a reference, that would be well appreciated.

Back to non-linear cap effects...this is one difference between
a simple emitter follower and a Sziklai. The Sziklai is more
sensitive to this effect and produces more distortion (see sims
in transient test thread). I had to increase the peak voltage on
the Square wave from 4 to 8 volts in order to see it while leaving
the sine wave at 1v peak.

>TIM is an op-amp dominated kind of distortion

Since amps don't have these low frequency open loop dominant poles,
and opamps do, then it sounds like TIM isn't much of a problem to an
amp?


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