Storing information with electrical fuse for device trimming
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsShine Chien Chung, Yun-Sheng Chen
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Abstract
A method and system is disclosed for device trimming. A device trimming system comprises at least one reference device to be trimmed having a reference electrical parameter, at least one trimming device to be coupled with the reference device for forming a trimmed reference device providing an altered reference electrical parameter based on a combination of the reference device and the trimming device, and at least one electrical fuse based control module for controlling whether the trimming device is to be coupled with the reference device based on a state of the electrical fuse.
Claims19
A circuit for device trimming, the circuit comprising:
- at least one reference device to be trimmed having a reference electrical parameter;
- at least one trimming device to be coupled with the reference device for forming a trimmed reference device providing an altered reference electrical parameter based on a combination of the reference device and the trimming device;
- at least one electrical fuse based control module for controlling whether the trimming device is to be coupled with the reference device based on a state of the electrical fuse;
- and
- a comparison module for comparing an electrical parameter of a selected device against the altered electrical parameter provided by the trimmed reference device,
- wherein the reference device and the trimming device are reference and trimming resistors, wherein the trimmed reference device is the trimmed reference resistor, and wherein the electrical parameter is resistance, and
- wherein the selected device is an electrical fuse.
A method for electrical device trimming using electrical fuses, the method comprising:
- identifying at least one reference device having a reference electrical parameter need to be trimmed;
- coupling at least one trimming device with the reference device for providing an altered reference electrical parameter based on an electrical combination of the reference device and the trimming device;
- and
- comparing an electrical parameter of a selected device against the altered reference electrical parameter,
- wherein at least one electrical fuse based control module is used for controlling whether the trimming device is to be coupled with the reference device based on a state of the electrical fuse, and
- wherein the selected electrical device is an electrical fuse.
A circuit for fuse reference resistance trimming, the circuit comprising:
- at least one reference resistor to be trimmed having a predetermined resistance;
- at least one trimming reference resistor to be coupled in a parallel fashion with the reference resistor for providing a reference resistance based on a combination of the reference resistor and the trimming reference resistor;
- at least one transistor for controlling whether the trimming reference resistor is to be coupled with the reference resistor based on a state of a predetermined electrical fuse coupled thereto;
- and
- a comparison module for comparing a resistance of a selected electrical fuse against the altered reference resistance to determined a state of the selected fuse.
Dependencies are inferred from the claim text.