[SI-LIST] Re: rise time and bandwidth
- From: Andrew Ingraham <a.ingraham@xxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 14 Sep 2011 09:15:15 -0400
If you can check the archives of this list, someone (I think it was
Howie Johnson) did an excellent analytical response of this issue a
few years back.
Part of the answer also had to do with whether the response was a
single pole lowpass, or a Gaussian response (which was more typical in
analog oscilloscopes); whether you use 10-90% as your risetime
criterion, or 20-80%, or 0-67%, or something else. And finally it
depends on your criterion for bandwidth: -3dB amplitude response, some
% accuracy, or a phase error which would distort the visible
waveshape.
The bottom line is, from a practical point of view the 0.35/Trise
relationship is only a very rough approximation (even though it is
analytically exact in certain situations), and you might expect
variations on the order of +/-100% depending on what you are doing.
Andy
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