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US 8,134,854 B2Granted
Efuse device
AssigneeMediatek Inc.
InventorRei-Fu Huang
Life of this patent
Estimating the term…
Abstract
An exemplary embodiment of an efuse device is provided, operating in a write mode and a read mode and comprising a source line, a cell, a blow device, and a sensing circuit. The cell has a first terminal coupled to the source line and a second terminal. The blow device is coupled between the second terminal of the cell and a ground terminal. The blow device is turned on in the read mode. The sensing circuit is coupled to the first terminal of the cell and the ground terminal, and is arranged to determine a state of the cell.
Claims17
An efuse device operating in a write mode and a read mode and comprising:
- a source line;
- a cell having a first terminal coupled to the source line and a second terminal;
- a blow device coupled between the second terminal of the cell and a ground terminal, wherein the blow device is turned on in the read mode;
- and
- a sensing circuit, coupled to the first terminal of the cell and the ground terminal, for determining a state of the cell, wherein the sensing circuit further comprises:
- an isolation unit coupled between the first terminal of the cell and a first terminal of a reference resistor, wherein the isolation unit is turned off in the write mode and on in the read mode;
- a pre-charging unit having first and second input nodes and coupled to the isolation unit, wherein the pre-charging unit charges voltages at the first and second nodes to a predetermined level before the isolation unit is turned on, and the first and second input nodes respectively receive a first voltage of the first terminal of the cell and a second voltage of the first terminal of the reference resistor when the isolation unit is turned on;
- an amplifying unit coupled to the first and second input nodes of the pre-charging unit and amplifying the first and second voltages;
- and
- an output unit receiving the amplified first and second voltages and outputting an output signal according to the amplified first and second voltages.
7 more elements
An efuse device operating in a write mode and a read mode and comprising:
- a source line;
- a cell having a first terminal coupled to the source line and a second terminal;
- a blow device coupled between the second terminal of the cell and a ground terminal providing a ground voltage;
- and
- a sensing circuit coupled to the first terminal of the cell and the ground terminal and comprising a reference resistor, wherein the reference resistor has a first terminal coupled to the sensing circuit and a second terminal, wherein the second terminal of the reference resistor is coupled to the ground voltage in the read mode;
- wherein in the read mode, the blow device is turned on, and the sensing circuit determines a state of the cell according to impedances of the cell and the reference resistor,
- wherein the sensing circuit further comprises:
- an isolation unit coupled between the first terminal of the cell and the first terminal of the reference resistor, wherein the isolation unit is turned off in the write mode and on in the read mode;
- a pre-charging unit having first and second input nodes and coupled to the isolation unit, wherein the pre-charging unit charges voltages at the first and second nodes to a predetermined level before the isolation unit is turned on, and the first and second input nodes respectively receive a first voltage of the first terminal of the cell and a second voltage of the first terminal of the reference resistor when the isolation unit is turned on;
- an amplifying unit coupled to the first and second input nodes of the pre-charging unit and amplifying the first and second voltages;
- and
- an output unit receiving the amplified first and second voltages and outputting an output signal according to the amplified first and second voltages.
9 more elements
An efuse device operating in a write mode and a read mode and comprising:
- a source line;
- a cell having a first terminal coupled to the source line and a second terminal;
- a blow device coupled between the second terminal of the cell and a ground terminal;
- and
- a sensing circuit, coupled to the first terminal of the cell and the ground terminal, for determining whether the cell is blown or not;
- wherein the sensing circuit further comprises:
- an isolation unit coupled between the first terminal of the cell and a first terminal of a reference resistor, wherein the isolation unit is turned off in the write mode and on in the read mode;
- a pre-charging unit having first and second input nodes and coupled to the isolation unit, wherein the pre-charging unit charges voltages at the first and second nodes to a predetermined level before the isolation unit is turned on, and the first and second input nodes respectively receive a first voltage of the first terminal of the cell and a second voltage of the first terminal of the reference resistor when the isolation unit is turned on;
- an amplifying unit coupled to the first and second input nodes of the pre-charging unit and amplifying the first and second voltages;
- and
- an output unit receiving the amplified first and second voltages and outputting an output signal according to the amplified first and second voltages;
- wherein in the read mode, the blow device is turned on;
- and
- wherein when the blow device is turned on in the write mode, the source line provides a current for blowing the cell.
11 more elements
Dependencies are inferred from the claim text.