On 12/07/2020 11:44 AM, Chris Albertson wrote:
Really? "As much as you want"? It is not hard at all to build a device
that works at the mechanical limits of an encoder but "as much as you want"
could be a lot more than what is possible.
There is going to be quantitation noise of the speed. The only way to
reduce it is to use a larger sampling period
The old ST L290 chip had no sampling period. For every
quadrature transition, it pulsed a one-shot that fed an
analog integrator. There was one one-shop per direction, so
if it dithered, the two integrators canceled out. Quite
simple, the cheap way could be done with a couple RCs and an
op amp.
Jon
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