Patent ID: 8564350

Claim:
A hysteresis device which produces an output signal in accordance with hysteresis characteristics that changes at a plurality of thresholds with respect to an input signal, the hysteresis device comprising: an input signal adjusting section that outputs an adjustment signal in which an offset level corresponding to each of the plurality of thresholds is added to the input signal; a comparator that outputs a first signal based on the adjustment signal, the first signal being binarized; and a determining section that controls the input signal adjusting section to switch the offset level for each of the plurality of thresholds, that acquires a respective first signal from the comparator for each switching of the offset level, and that produces a present output signal based on a previous output signal and the respective first signals corresponding to the plurality of thresholds, wherein the determining section includes a memory for storing the previous output signal of the determining section; and wherein the determining section produces the present output signal based on the previous output signal of the determining section stored in the memory and the first signals corresponding to the plurality of thresholds.