AHA2790UW has speed-limit problems ?

[Mike Bilow]

Ross Harvey wrote in a message to Mike Bilow:

 RH> The problem is complicated considerably by the non-intuitive
 RH> fact that your objective is _not_ to minimize the total
 RH> signal distortion, but rather you want to minimize the
 RH> magnitude of the largest single distortion at any sample
 RH> point, even if this means increasing distortion that would
 RH> be below the noise margin. That's why you don't want
 RH> reflections to superimpose, even at the price of more noise.

At the risk of getting into an argument which could be as unending and
controversial as whether toilet paper should feed from under or over the roll,
it is worth pointing out that damping per se is sufficient to solve this
problem, and the easiest way to achieve that -- regardless of what the standard
says and whatever theoretical justifications may be advanced -- is simply to
overterminate the bus.  If there is a third terminator added in the middle of
the bus somewhere, it will usually correct superimposition problems.
 
-- Mike


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