Patent ID: 8324950
Filing Date: 2012-12-04
Classification: H03K

Abstract:
1. A Schmitt trigger circuit that is operated based on a pulse width, comprising: a signal/pulse conversion unit that receives an analog signal to generate an input pulse having a width corresponding to a magnitude of the analog signal; a pulse width determination unit that compares the width of the input pulse generated in the signal/pulse conversion unit with a predetermined first threshold width and a second threshold width greater than the first threshold width to output state information indicating the compared result; and an output determination unit that outputs a high signal, when the width of the input pulse is changed from a state of being smaller than the second threshold width to a state of being greater than the second threshold width based on the state information, and outputs a low signal when the width of the input pulse is changed from a state of being greater than the first threshold, width to a state of being smaller than the first threshold width based on the state information.