US 7,443,227 B2Granted

Adjusting circuit

AssigneePhison Electronics Corp.

InventorYu-Tong Lin

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Abstract

A programmable detection adjuster is disclosed. The programmable detection adjuster comprises a bandgap and an adjusting circuit. The bandgap comprises a power input terminal, a voltage output terminal, a main resistance and a plurality of resistors. The adjusting circuit comprises a plurality of adjusting resistors, a plurality of transistor switches, a logic controller and detection circuits; said adjusting resistors connected to the main resistance of the bandgap in series. The adjusting resistors are respectively connected to the transistor switch in parallel. The transistor switches are connected to the logic controller. The logic controller is respectively connected to the detection circuits. The detection circuit detects the corresponding resistances in the detection circuit and outputs a voltage level to the logic controller to enable the logic controller to control a conduction of the transistor switches according to a logic conversion table.

Claims27

Dependent claims

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.

2 more elements

Dependencies are inferred from the claim text.