On Wed, Nov 8, 2017 at 11:41 AM, Nicklas Karlsson <[email protected]> wrote: >> Open collector transistors are likely not the best cable drivers. > > Push-pull differential is the best. > >> ... The best designs I've seen use a >> comparer with a bit of feedback applied to create hysteresis. So >> that each edges is latched. > > I think hysteresis also make transition fast.
Yes and no. hysteresis is required if you need to remove the very fast back and forth transitions as an analog state changes. These optical encoders with just a transistor out are analog sensors. If the signal coming out of the comparator has a fast raise time or not depends on a lot of things but they are all under your control. You can make the RC constants anything you like. My real point was that I was looking into hardware quadrature decoders and food out that they are just a few flip-flops and gates. Then I find I don't even need to build anything because there are decoder ships. Then I find I don't need the decoder chips because the decoder is built-into the micro controller. Quadrature decoding is "free" in the same way as serial UARTs are free. > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
