Patent ID: 7443227
Filing Date: 2008-10-28
Classification: G05F

Abstract:
1. An adjusting circuit, for adjusting a reference voltage outputted from an output terminal of a bandgap circuit, the bandgap circuit comprising a main resistor, wherein a first terminal of the main resistor is coupled to the output terminal of the bandgap circuit, a second terminal of the main resistor is coupled to a ground through the adjusting circuit, the adjusting circuit comprising: a plurality of adjusting resistors, coupled in series between the second terminal of the main resistor and the ground; a plurality of first switches, wherein the ith first switch corresponds to the ith adjusting resistor, and the ith first switch couples the ith adjusting resistor in parallel, where i is a positive integer; a plurality of detection circuits, wherein the ith detection circuit corresponds to the ith first switch for generating a detection signal by detecting whether a fuse within the ith detection circuit is blown out or not, or comparing a relationship between a current flowing through the fuse and a current flowing through a resistor within the ith detection circuit; and a logic controller, coupled to the first switches and the detection circuits, for controlling whether the first switches are conducted or not by finding a combination of the detection signals generated from the detection circuits in a logic conversion table.