Trim fuse circuit capable of disposing trim conducting pads on scribe lines of wafer
AssigneeAdvanced Analog Technology, Inc.
InventorsChao-Hsing Huang, Chun-Liang Yeh
Life of this patent
Estimating the term…
Abstract
A trim fuse circuit includes a metal fuse, a trim pad coupled to the first end of the metal fuse, a first transistor coupled to the first end of the metal fuse, a second transistor coupled to the second end of the metal fuse, an inverter coupled to the second end of the metal fuse, a switch coupled to the second end of the metal fuse, and a common trim pad coupled to the control end of the switch. The inverter outputs a data signal according to the status of the metal fuse. The trim pad can be disposed on the scribe line of a wafer. When the trim pad is cut and accordingly connects to the substrate of the wafer, the data signal is not affected.
Claims11
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.
Dependencies are inferred from the claim text.