Patent ID: 8350611

Claim:
A start circuit, using a start voltage to start a reference circuit comprising a first bias node and a second bias node, and the start circuit comprising: a load unit, having a first end receiving a power voltage; a first switch, having a first end electrically connected to a second end of the load unit, a second end electrically connected to a ground, and a control end receiving a node voltage from the first bias node; a second switch, having a first end electrically connected to the second bias node, a second end electrically connected to the ground, and a control end electrically connected to the second end of the load unit, wherein the second switch determines whether or not to provide the start voltage to the second bias node according to a conducting state thereof; and a reset control circuit, for providing a discharge path between the control end of the first switch and the ground, and conducting the discharge path according to the power voltage during a period when the power voltage is smaller than a threshold voltage.