Hall sensor rising edge vs falling edge

[aeccles]

I'll start this as a very general question. I'm more that happy to provide additional details.
Does anyone know (have a theory) why the rising edge of a hall sensor IC would have significantly more jitter than the falling edge when the motor is running at very, very constant speed?

[mjkuwp]

Are you measuring jitter with a logic analyzer?  that isn't necessarily related to the theory.  A theory is that the rising edge is created by a pullup resistor so the signal rises slowly.  this creates a longer period of uncertainty in the logic levels.  Conversely, the falling edge is created by a fet turning on and the signal drops quickly, transitioning through the levels more quickly.  this is just an idea, I am not an expert.