If the Hall effect sensor's amplifier is digital, the output will rapidly change from one state to the other when a magnetic field is sensed.

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Using a digital amplifier in a Hall effect sensor means the tiny Hall voltage is fed into a comparator that yields a definite high or low logic level. When the magnetic field crosses the set threshold, the comparator switches quickly, giving a crisp on/off transition. The output stays in one state until the field crosses the opposite threshold, and may include hysteresis to prevent chatter near the switch point. Because of this, the signal is not a gradual voltage that follows the field; it’s a binary change between two states. The other descriptions don’t fit as well: an analog output would vary smoothly with field strength, a pulsed output implies a regular waveform, and saturated describes reaching a limit value rather than producing a clean binary switch.