"Don Pearce" wrote in message
...
On Mon, 11 Jan 2010 18:19:50 -0000, "David Looser"
wrote:


It may have been "unheard of", but it existed all the same. Any amplifier,
with or without feedback, can exhibit slew-rate limiting if the bandwidth
is
insufficient to cope with the rate of rise or fall of the input signal.

Excessive bandwidth is the cause of the problem.

You mean excessive bandwith of the input signal I presume. That's another
way of saying insufficient bandwidth in the amplifier.

Slew rate limiting is
in fact plain ordinary limiting (sawing the tops off a sine wave) but
in the current domain when feeding a capacitor. Because of the
differentiation it looks in the voltage domain like a straight slop.

That's one mechanism, there are others, the Miller effect for example.

Excessive bandwidth permits large fast signals that will show limiting
of this kind.

Indeed, excessive bandwidth of the incoming signal. But as Jim showed a
simple passive filter on the input to the amplifier solves it.

David.