Patent ID: 9654088
Date: 2017-05-16
CPC Classifications: H03K

Claim:
1. A hysteresis circuit, comprising: a current comparator having a first input node coupled to an input current signal; a reference current source coupled to a second input node of the current comparator; a hysteresis current source; a switch coupled between the reference current source and the hysteresis current source; and at least one buffer, a first buffer of the at least one buffer having an input node coupled to an output node of the current comparator, wherein the output node and the second input node are different nodes of the current comparator; wherein the at least one buffer provides an output voltage signal that has a first voltage in response to the input current signal being greater than a sum of a reference current from the reference current source and a hysteresis current from the hysteresis current source, and the output voltage signal has a second voltage, different from the first voltage, in response to the input current signal being less than the reference current.