Patent ID: 7733158

Claim:
A trim fuse circuit capable of disposing trim conducting pads on a scribe line of a wafer, the trim fuse circuit comprising: a current control module, comprising: a transistor, comprising: a first end, electrically connected to a first voltage source; a second end; and a control end; and a constant current source, electrically connected to the second end of the transistor of the current control module for generating a reference current; a fuse set, comprising: a first transistor, comprising: a first end, electrically connected to a second voltage source; a second end; and a control end, electrically connected to the second end of the first transistor of the fuse set; a second transistor, comprising: a first end, electrically connected to the first voltage source; a second end; and a control end, electrically connected to the control end of the transistor of the current control module; wherein the second transistor of the fuse set and the transistor of the current control module form a current mirror for generating the reference current from the second end of the second transistor of the fuse set; a fuse, comprising: a first end, electrically connected to the second end of the first transistor of the fuse set; and a second end, electrically connected to the second end of the second transistor of the fuse set; and an inverter, comprising: an input end, electrically connected to the second end of the fuse; and an output end for generating an information signal; wherein when voltage level on the input end of the inverter is higher than a first predetermined voltage level, the information signal is at a low voltage level, and when the voltage level on the input end of the inverter is lower than a second predetermined voltage level, the information signal is at a high voltage level; and a trim control module, comprising: a trim conducting pad, disposed on the scribe line of the wafer; a common trim conducting pad; and a switch, comprising: a first end, electrically connected to the input end of the inverter of the fuse set; a second end, electrically connected to the first voltage source; and a control end, electrically connected to the common trim conducting pad; wherein the first end of the switch is electrically connected to the second end of the switch according to voltage on the common trim conducting pad.