[SI-LIST] Re: ac drive strength

You could try measuring risetime into a capacitive load.  This is 
essentially dv/dt into C and measures the current drive of the 
buffer.  Measure this at several different capacitive loads.  Plot the 
points and see if the current source is a good model for your buffer.  If 
the risetime doesn't change much over a range of capacitive loads, then 
your buffer is better modeled by a voltage source.

Watch out for stray inductance in your test setup.


Chuck Hill, consultant



At 11:30 AM 7/23/01, Peterson, James F (FL51) wrote:

>Hello,
>
>What's the best way to specify the ac drive strength of a buffer? The
>requirement should be testable.
>
>I was thinking about defining it with a source impedance at typical
>voltage/temp's....any suggestions on how to test this?
>
>thanks,
>Jim
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