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Unread 03-05-2013, 00:36
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Re: Arbitrary Quadrature Encoder

Yes, the limiting factor would be the phototransistors. It is about three times slower compared to the op-amp. The phototransistor only needs to trigger the hysteresis, which can be slightly reduced. The theoretical peak of the phototransistor would then match the capabilities of the op-amp.

Theoretically, the encoder can go faster than the cRIO can handle but it does not even come close to what the jaguar can handle. For the Jaguar case the op-amp and the phototransistor are the limiting components.
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