CN106033107B - The calibration method and circuit of the blowout current of fuse - Google Patents
The calibration method and circuit of the blowout current of fuse Download PDFInfo
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Abstract
This application provides a kind of calibration method of the blowout current of fuse and circuits.The calibration method includes: the pressure drop for obtaining fuse in duplication fuse cell, wherein duplication fuse cell is identical as standard replicated fuse cell；The virtual voltage calculated between pressure drop and normal voltage is poor；Virtual voltage difference is converted into programming coding；And being switched on or off using the NMOS transistor in programming coding-control standard replicated fuse cell, to adjust the electric current for the fuse that standard replicated fuse cell is controlled.Met well using the program current that this method calibration obtains with technique and application environment, it avoids and the generation of the deviation of actual program electric current that technique and application environment need or greatly reduces deviation, the difference for greatly reducing or eliminating predetermined current caused by the deviation of technique and application environment and program current actually required improves the stability and accuracy of the fuse electric current that standard replicated fuse cell is controlled.
Description
Technical Field
The invention relates to the field of semiconductors, in particular to a method and a circuit for calibrating fusing current of a fuse.
Background
As fuse (eFuse) theory and technology has grown mature, the range of efuses applications has expanded rapidly. The design of the eFuse cell is gradually changed from the original design concept of the rupture model to an Electro Migration model (EM model for short) which is currently and generally applied so as to remarkably improve the stability and reliability of the eFuse cell, and for the eFuse cell design of the EM model, the stability and accuracy of the fusing current become the key of the design.
The traditional design mode is as follows: in the design aspect of the current eFuse unit, because the control of the magnitude of the eFuse unit programming current is mainly realized by controlling the switch NMOS, wherein the control switch NMOS is connected in series with the eFuse resistor, the deviation of the programming current caused by the deviation of the process and the application environment is mainly overcome by relatively large channel length during the design, and the scheme has the main defects that the layout area of the eFuse unit is greatly increased, so that the area utilization rate in the design of a large-capacity eFuse module is low; secondly, even if a larger channel length is used, the deviation caused by process and application environment deviation can be weakened only to a certain extent, the improvement is limited, and the accuracy of the fusing current cannot be ensured.
Aiming at the problem that the fusing current can not be accurately controlled in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The present invention is directed to a method and a circuit for calibrating a fusing current of a fuse, so as to solve the problem in the prior art that the fusing current cannot be accurately controlled.
In order to achieve the above object, according to an aspect of an embodiment of the present invention, there is provided a method for calibrating a blowing current of a fuse, including: obtaining the voltage drop of a fuse in a copy fuse unit, wherein the copy fuse unit is the same as a standard copy fuse unit; calculating the actual voltage difference between the voltage drop and the standard voltage; converting the actual voltage difference into a programming code; and controlling the NMOS transistor in the standard copy fuse unit to be turned on or off according to the programming code so as to adjust the current of the fuse controlled by the standard copy fuse unit.
Further, the converting the voltage difference into the programming code includes: converting the actual voltage difference into digital codes by using an analog-to-digital conversion circuit; inputting the digital code into a checking control logic unit; and converting the digital code into the programming code by using the check control logic unit.
Further, converting the digital code into the programming code using the check control logic unit includes:
acquiring the code of the reference voltage difference; comparing the magnitude of the actual voltage difference with the magnitude of the reference voltage difference by using the digital code and the code of the reference voltage difference; outputting a programming code that reduces the number of turned-on NMOS transistors in the NMOS array if the actual voltage difference is greater than the reference voltage difference; and outputting a programming code that increases the number of turned-on NMOS transistors in the NMOS array if the actual voltage difference is less than the reference voltage difference.
Further, converting the digital code into the programming code using the check control logic unit includes:
acquiring a comparison table for programming codes; and searching the programming code corresponding to the digital code from the comparison table.
Further, the controlling the NMOS transistor in the standard copy fuse unit to be turned on or off by using the programming code to adjust the current of the fuse controlled by the standard copy fuse unit includes: controlling one or more NMOS transistors in the standard copy fuse unit to be conducted by using one bit code in the programming codes; or
And controlling one or more NMOS transistors in the standard copy fuse unit to be switched off by using one bit code in the programming codes.
Further, before obtaining the voltage drop of the fuse in the replica fuse unit, the calibration method further includes: the replica fuse unit is supplied with a preset current for programming the fuse.
In order to achieve the above object, according to another aspect of embodiments of the present invention, there is provided a calibration circuit of a blowing current of a fuse, the calibration circuit of the blowing current of the fuse according to the present invention including: a replica fuse unit including a fuse and an NMOS transistor array connected in series; a voltage detection circuit connected to the fuse and configured to detect a voltage across the fuse; a control logic unit connected with the voltage detection circuit for calculating the actual voltage difference between the voltage and the standard voltage and outputting a programming code according to the actual voltage difference; and a standard copy fuse unit connected with the control logic unit and used for controlling the current of the fuse according to the programming code.
Further, the control logic unit includes: the input end of the analog-to-digital conversion circuit is connected with the output end of the voltage detection circuit and is used for calculating the actual voltage difference and converting the actual voltage difference into digital codes; and the input end of the control logic circuit is connected with the output end of the analog-to-digital conversion circuit and is used for converting the digital code into a programming code.
Further, the control logic unit includes a plurality of output terminals, wherein each of the plurality of output terminals is connected to one or more NMOS transistors in the standard replica fuse unit.
Further, the voltage detection circuit is a multiplexer, wherein a first detection terminal of the multiplexer is connected to a first terminal of the fuse, and a second detection terminal of the multiplexer is connected to a second terminal of the fuse.
By applying the technical scheme of the application, the preset current is not directly adopted as the programming current, the voltage drop of the fuse wire in the copy fuse wire unit is firstly obtained, the voltage drop is the same as the voltage drop when the preset current flows through the standard copy fuse wire unit, then the voltage difference is calculated, the coding conversion is carried out, and finally the programming coding conversion is carried out to control the connection or disconnection of the NMOS transistor in the standard copy fuse wire unit, so that the current of the fuse wire controlled by the standard copy fuse wire unit is calibrated, the programming current obtained through calibration well accords with the process and the application environment, the deviation of the actual programming current required by the process and the application environment is avoided or greatly reduced, the difference of the preset current and the actual programming current caused by the deviation of the process and the application environment is greatly reduced or eliminated, the stability and accuracy of the fuse current controlled by the standard copy fuse unit are improved.
In addition, in the method, all NMOS transistors can control the current of the fuse to be accurately calibrated only by adopting NMOS transistors with smaller channel length, and the area of a copied fuse unit is smaller; NMOS transistors with larger channel length are not needed to reduce the deviation of programming current caused by the deviation of the process and the application environment, and the problem of low area utilization rate in the design of a large-capacity copy fuse unit is further solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method for calibrating a blowing current of a fuse according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a calibration circuit for the blowing current of a fuse in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a calibration circuit for the blowing current of the fuse in accordance with a preferred embodiment of the present invention; and
FIG. 4 is a schematic diagram of a standard replica fuse cell including a programmable NMOS array according to a preferred embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a method for calibrating fusing current of a fuse.
FIG. 1 is a flowchart illustrating a method for calibrating a blowing current of a fuse according to an embodiment of the present invention. As shown in fig. 1, the method for calibrating the blowing current of the fuse includes the following steps:
step S102, obtaining the voltage drop of the fuse in the copy fuse unit, wherein the copy fuse unit is the same as the standard copy fuse unit;
step S104, calculating the actual voltage difference between the voltage drop and the standard voltage;
step S106, converting the actual voltage difference into a programming code; and
step S108, controlling the NMOS transistor in the standard copy fuse unit to be turned on or off according to the programming code, so as to adjust the current of the fuse controlled by the standard copy fuse unit.
Compared with the prior art, the method does not directly adopt the preset current as the programming current, but firstly obtains the voltage drop of the fuse in the copy fuse unit, the voltage drop is the same as the voltage drop when the preset current flows through the standard copy fuse unit, then, through calculation and code conversion, the NMOS transistor in the standard copy fuse unit is controlled to be turned on or off through programming codes, and then the current of the fuse controlled by the standard copy fuse unit is calibrated, so that the programming current obtained through calibration well accords with the process and the application environment, the generation of the deviation of the actual programming current required by the process and the application environment is avoided or the deviation value is greatly reduced, the difference value between the preset current and the actually required programming current caused by the deviation of the process and the application environment is greatly reduced or eliminated, and the stability and the accuracy of the fuse current controlled by the standard copy fuse unit are improved.
In addition, in the method, all NMOS transistors can control the current of the fuse to be accurately calibrated only by adopting NMOS transistors with smaller channel length, and the area of a copied fuse unit is smaller; NMOS transistors with larger channel length are not needed to reduce the deviation of programming current caused by the deviation of the process and the application environment, and the problem of low area utilization rate in the design of a large-capacity copy fuse unit is further solved.
In order to accurately convert the voltage difference into the programming code, further accurately calibrate the current of the fuse controlled by the standard copy fuse unit, and improve the stability and accuracy of the fuse current controlled by the standard copy fuse unit, the present application preferably converts the voltage difference into the programming code, and includes: converting the actual voltage difference into digital codes by using an analog-to-digital conversion circuit; inputting the digital code into a checking control logic unit; and converting the digital code into the programming code by using the check control logic unit.
In another preferred embodiment of the present application, converting the digital code into the programming code by the inspection control logic unit includes: acquiring the code of the reference voltage difference; comparing the magnitude of the actual voltage difference with the magnitude of the reference voltage difference by using the digital code and the code of the reference voltage difference; outputting a programming code that reduces the number of turned-on NMOS transistors in the NMOS array if the actual voltage difference is greater than the reference voltage difference; and outputting a programming code that increases the number of turned-on NMOS transistors in the NMOS array if the actual voltage difference is less than the reference voltage difference.
For example, in a four-bit analog-to-digital conversion circuit and an eight-bit NMOS programming coding circuit (one output end of the two circuits corresponds to one-bit coding, and one-bit coding corresponds to n NMOS transistors), a "0" in the coding corresponds to a transistor being off, a "1" corresponds to a transistor being on, an actual voltage difference is input into the analog-to-digital conversion circuit and converted into 0101, a digital coding of a reference voltage difference is 1000, and the 0101 and 1000 are compared to obtain voltages of the NMOS transistors corresponding to three output ends, where the actual voltage difference is smaller than the reference voltage difference, so that the output programming coding should be coding for turning on 3n NMOS transistors, the programming coding for calibration should be 01111111 on the basis of the programming coding 00001111 of the reference voltage difference, and then the current of the 3n NMOS transistors is preset to increase the sum of currents of the 3n NMOS transistors, thereby realizing calibration of.
According to the scheme, the actual voltage difference and the reference voltage difference can be compared only by comparing the digital code of the reference voltage difference with the digital code of the actual voltage difference, and then the corresponding programming code can be output according to the comparison result, namely the scheme can accurately acquire the programming codes for controlling the quantity of the NMOS transistors in the transistor array to be switched on or switched off by adopting a simpler mode, so that the NMOS transistors in the transistor array can be controlled to be switched on or switched off, and the current of the fuse controlled by the standard copy fuse unit is further calibrated.
In another preferred embodiment of the present application, the converting the digital code into the programming code by the inspection control logic preferably includes: acquiring a comparison table for programming codes; and searching the programming code corresponding to the digital code from the comparison table.
For example, in the above example of 0101, the programming code corresponding to 0101 is found in the programming code comparison table 1 as 01111111, and the programming code corresponding to the reference voltage difference is found as 00001111, since "0" in the coding corresponds to the transistor being off and "1" corresponds to the transistor being on, 3n NMOS transistors should be turned on, and the preset current is increased by the sum of the currents of 3n NMOS transistors, so as to realize calibration of the current of the fuse controlled by the standard copy fuse unit.
In addition, because the method can more quickly acquire the programming code corresponding to the digital code, namely the programming code corresponding to the digital code can be accurately acquired only according to the programming code comparison table, the efficiency of acquiring the programming code is improved.
In the above example, the "0" and the "1" in the coding represent the off state and the on state of the NMOS transistor, respectively, in a specific application, the "0" and the "1" are not limited to the above meanings, and those skilled in the art can define the meanings of the "0" and the "1" according to the actual needs, the "0" can represent the on state and the off state, and the "1" can represent the on state and the off state.
In order to efficiently control the NMOS transistor in the standard copy fuse unit to turn on or off and improve the operating efficiency of the copy fuse unit, the present application preferably controls the NMOS transistor in the standard copy fuse unit to turn on or off by using the programming code to adjust the current of the fuse controlled by the standard copy fuse unit, including: when the programming current caused by the process and application environment deviation is often smaller than the standard current required by the fuse, one bit of the programming code is used for controlling one or more NMOS transistors in the standard copy fuse unit to be conducted; or when the programming current caused by the process and application environment deviation is often larger than the standard current required by the fuse, one bit of the programming code is used for controlling one or more NMOS transistors in the standard copy fuse unit to be switched off.
In another preferred embodiment of the present application, before obtaining the voltage drop of the fuse in the replica fuse unit, the calibration method further includes: the replica fuse unit is supplied with a preset current for programming the fuse.
The embodiment of the invention also provides a calibration circuit for the fusing current of the fuse. It should be noted that the calibration circuit for the blowing current of the fuse according to the embodiment of the present invention may be used to perform the calibration method for the blowing current of the fuse according to the embodiment of the present invention, and the calibration method for the blowing current of the fuse according to the embodiment of the present invention may also be performed by the calibration circuit for the blowing current of the fuse according to the embodiment of the present invention.
FIG. 2 is a diagram illustrating a calibration circuit for a blowing current of a fuse according to an embodiment of the present invention. As shown in fig. 2, the calibration circuit for the blowing current of the fuse includes a replica fuse cell 10, a voltage detection circuit 30, a control logic unit 50, and a standard replica fuse cell 70. Wherein,
a replica fuse unit 10 including a fuse and an NMOS transistor array connected in series;
a voltage detection circuit 30 connected to the fuse and detecting a voltage across the fuse;
a control logic unit 50 connected to the voltage detection circuit 30 for calculating an actual voltage difference between the voltage and a standard voltage and outputting a programming code; and
and a standard copy fuse unit 70 connected to the control logic unit 50 for controlling the current of the fuse according to the programming code.
The calibration circuit for the fusing current of the fuse wire does not directly adopt a preset current as a programming current, but firstly adopts the voltage detection circuit 30 to obtain the voltage drop of the fuse wire in the copy fuse wire unit, the voltage drop of the fuse wire is the same as the voltage drop at two ends of the standard copy fuse wire unit, then utilizes the control logic unit to carry out calculation and code conversion, and finally controls the connection or disconnection of an NMOS transistor in the standard copy fuse wire unit through the programming code output by the control logic unit, thereby calibrating the current of the fuse wire controlled by the standard copy fuse wire unit. The programming current obtained through calibration well accords with the process and the application environment, the generation of the deviation of the actual programming current required by the process and the application environment is avoided or the deviation value is greatly reduced, the difference value between the preset current and the actually required programming current caused by the deviation of the process and the application environment is greatly reduced or eliminated, and the stability and the accuracy of the fuse current controlled by the standard copy fuse unit are improved.
Compared with the prior art, the embodiment first obtains the voltage drop of the fuse in the replica fuse unit, the voltage drop is the same as the voltage drop when the preset current flows through the standard replica fuse unit, then, through calculation and code conversion, the NMOS transistor in the standard copy fuse unit is controlled to be turned on or off through programming codes, and then the current of the fuse controlled by the standard copy fuse unit is calibrated, so that the programming current obtained through calibration well accords with the process and the application environment, the generation of the deviation of the actual programming current required by the process and the application environment is avoided or the deviation value is greatly reduced, the difference value between the preset current and the actually required programming current caused by the deviation of the process and the application environment is greatly reduced or eliminated, and the stability and the accuracy of the fuse current controlled by the standard copy fuse unit are improved.
In addition, all NMOS transistors in the circuit only need to adopt NMOS transistors with smaller channel length, the current of the controlled fuse can be accurately calibrated, and the area of the copied fuse unit is smaller; NMOS transistors with larger channel length are not needed to reduce the deviation of programming current caused by the deviation of the process and the application environment, and the problem of low area utilization rate in the design of a large-capacity copy fuse unit is further solved.
In order to improve the precision of the blowing current calibrated by the calibration circuit of the blowing current of the fuse, and further improve the stability and precision of the fuse current controlled by the standard replica fuse unit, the control logic unit preferably includes: the input end of the analog-to-digital conversion circuit is connected with the output end of the voltage detection circuit and used for calculating and obtaining the actual voltage difference and converting the actual voltage difference into a digital code; and the input end of the control logic circuit is connected with the output end of the analog-to-digital conversion circuit and is used for converting the digital code into a programming code.
In another preferred embodiment of the present application, it is preferable that the control logic unit includes a plurality of output terminals, where: each of the plurality of output terminals is connected to one or more NMOS transistors in the standard replica fuse cell. When the number of NMOS transistors contained in the standard copy fuse unit is large, each output end is connected with a plurality of NMOS transistors in the standard copy fuse unit, so that the problem that the manufacturing process of the control logic unit is complex due to the fact that the control logic unit needs more output ends is solved; when the standard copy fuse unit comprises a small number of NMOS transistors, each output end is connected with one NMOS transistor in the standard copy fuse unit, so that each output end can accurately control the on and off of one NMOS transistor, and the accuracy of the calibration current of the calibration circuit for the fusing current of the fuse is further improved.
In order to obtain the voltage drop across the fuse, the voltage detection circuit is preferably a multiplexer, wherein a first detection end of the multiplexer is connected to a first end of the fuse, and a second detection end of the multiplexer is connected to a second end of the fuse.
In order to make the technical solution of the present application more clearly understood by those skilled in the art, the following will describe the solution of the present application in detail with reference to the accompanying drawings and with a four-bit analog-to-digital conversion circuit, eight-bit NMOS programming coding as an embodiment.
First, the replica fuse unit 10 in fig. 3 is supplied with a blowing current, i.e., a preset current, intended for the fuse controlled by the standard replica fuse unit, corresponding to m transistors in the standard replica fuse unit 10 being turned on, m being a natural number.
Then, the voltage across the fuse is detected by a voltage detection circuit 30 connected to both ends of the fuse, and the voltage detection circuit 30 here is a multiplexer.
Next, the programming code is output by the control logic unit 50.
The output voltage of the voltage detection circuit 30 and the standard voltage are input into the analog-to-digital conversion circuit 51, the difference is made between the two to obtain an actual voltage difference, and the actual voltage difference is converted into a digital code by the analog-to-digital conversion circuit 51. Assuming that the number code corresponding to the actual voltage difference is 1011 at this time, "0" in the code corresponds to the transistor being turned off, and "1" corresponds to the transistor being turned on.
The digital code 1011 output by the analog-to-digital conversion circuit is input into the control logic circuit 52, the control logic circuit 52 obtains the programming code 00000001 corresponding to the digital code 1011, the digital code 1000 corresponding to the reference voltage difference, the corresponding programming code 00001111, and the comparison between 00000001 and 00001111 can show that the actual voltage difference is larger than the reference voltage difference and the voltage of the NMOS transistors corresponding to the three output ends, so that the number of the transistors corresponding to the preset current in the standard copy fuse unit 70 is reduced from m to m-3n, wherein n is the number of the NMOS transistors corresponding to the output end of one control logic circuit 50.
Finally, 3n NMOS transistors corresponding to the three outputs of the control logic circuit 50 are disconnected from the standard replica fuse unit 70 using the above-described programming code 00000001. As shown in fig. 4, the control signals of b0, b1, b2 … … b7 correspond to 00000001, where 1 represents enabling the NMOS transistor for blowing of the fuse.
TABLE 1
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
compared with the prior art, the calibration method and the circuit of the fusing current of the fuse wire do not directly adopt the preset current as the programming current, the voltage drop of the fuse wire in the copy fuse wire unit is firstly obtained, the voltage drop is the same as the voltage drop when the preset current flows through the standard copy fuse wire unit, then the calculation, the code conversion and the digital code conversion are carried out, the on-off of the NMOS transistor in the standard copy fuse wire unit is controlled through the programming code, and the current of the fuse wire controlled by the standard copy fuse wire unit is calibrated, so that the programming current obtained through calibration well accords with the process and the application environment, the generation of the deviation of the actual programming current required by the process and the application environment is avoided or the deviation value of the actual programming current required by the process and the application environment is greatly reduced or eliminated, the difference value of the preset current caused by the deviation of the process and the application environment is greatly reduced or eliminated, the stability and accuracy of the fuse current controlled by the standard copy fuse unit are improved.
In addition, the method and all NMOS transistors in the circuit can accurately calibrate the current of the fuse wire controlled by the NMOS transistor with a smaller channel length, and the area of the copied fuse wire unit is smaller; NMOS transistors with larger channel length are not needed to reduce the deviation of programming current caused by the deviation of the process and the application environment, and the problem of low area utilization rate in the design of a large-capacity copy fuse unit is further solved.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for calibrating a blowing current of a fuse, comprising:
obtaining the voltage drop of a fuse in a copy fuse unit, wherein the copy fuse unit is the same as a standard copy fuse unit;
calculating an actual voltage difference between the voltage drop and a standard voltage;
converting the actual voltage difference into a programming code; and
controlling the NMOS transistor in the standard copy fuse unit to be turned on or off according to the programming code so as to adjust the current of the fuse controlled by the standard copy fuse unit;
in the four-bit analog-to-digital conversion circuit and the eight-bit NMOS programming coding circuit, a transistor corresponding to 0 in coding is disconnected, a transistor corresponding to 1 in coding is connected, the actual voltage difference is input into the analog-to-digital conversion circuit and converted into 0101, the digital coding of the reference voltage difference is 1000, the 0101 and the 1000 are compared to obtain the voltage of the NMOS transistor, and programming coding is output, wherein the programming coding is obtained by connecting 3n NMOS transistors.
2. The calibration method of claim 1, wherein converting the actual voltage difference to a programming code comprises:
converting the actual voltage difference into a digital code by using an analog-to-digital conversion circuit;
inputting the digital code to an inspection control logic unit; and
converting the digital code to the programming code with the inspection control logic.
3. The calibration method of claim 2, wherein converting the digital code to the programming code with the inspection control logic comprises:
acquiring the code of the reference voltage difference;
comparing the magnitude of the actual voltage difference with the magnitude of the reference voltage difference using the digital code and the code of the reference voltage difference;
outputting a programming code that reduces the number of turned-on NMOS transistors in the NMOS array if the actual voltage difference is greater than the reference voltage difference; and
outputting a programming code that increases the number of turned-on NMOS transistors in the NMOS array if the actual voltage difference is less than the reference voltage difference.
4. The calibration method of claim 2, wherein converting the digital code to the programming code with the inspection control logic comprises:
acquiring a comparison table for programming codes; and
and searching the programming code corresponding to the digital code from the comparison table.
5. The calibration method of claim 1, wherein controlling the NMOS transistor in the standard replica fuse cell to turn on or off according to the programming code to adjust the current of the fuse controlled by the standard replica fuse cell comprises:
controlling one or more NMOS transistors in the standard copy fuse unit to be conducted by using one bit code in the programming codes; or
One bit of the programming codes is used for controlling one or more NMOS transistors in the standard copy fuse unit to be turned off.
6. The calibration method according to claim 1, wherein before obtaining the voltage drop of the fuse in the replica fuse cell, the calibration method further comprises:
a preset current for programming a fuse is supplied to the replica fuse unit.
7. A calibration circuit for a blowing current of a fuse, comprising:
a replica fuse unit including a fuse and an NMOS transistor array connected in series;
the voltage detection circuit is connected with the fuse wire and is used for detecting the voltage at two ends of the fuse wire;
the control logic unit is connected with the voltage detection circuit and used for calculating the actual voltage difference between the voltage and the standard voltage and outputting a programming code according to the actual voltage difference; and
the standard copy fuse unit is connected with the control logic unit and is used for controlling the current of the fuse according to the programming code;
in the four-bit analog-to-digital conversion circuit and the eight-bit NMOS programming coding circuit, a transistor corresponding to 0 in coding is disconnected, a transistor corresponding to 1 in coding is connected, the actual voltage difference is input into the analog-to-digital conversion circuit and converted into 0101, the digital coding of the reference voltage difference is 1000, the 0101 and the 1000 are compared to obtain the voltage of the NMOS transistor, and programming coding is output, wherein the programming coding is obtained by connecting 3n NMOS transistors.
8. The calibration circuit of claim 7, wherein the control logic unit comprises:
the input end of the analog-to-digital conversion circuit is connected with the output end of the voltage detection circuit and is used for calculating the actual voltage difference and converting the actual voltage difference into digital codes;
and the input end of the control logic circuit is connected with the output end of the analog-to-digital conversion circuit and is used for converting the digital code into a programming code.
9. The calibration circuit of claim 7, wherein the control logic unit comprises a plurality of outputs, wherein,
each of the plurality of output terminals is connected to one or more NMOS transistors in the standard replica fuse cell.
10. The calibration circuit of claim 7, wherein the voltage detection circuit is a multiplexer, wherein,
the first detection end of the multiplexer is connected with the first end of the fuse, and the second detection end of the multiplexer is connected with the second end of the fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510122461.0A CN106033107B (en) | 2015-03-19 | 2015-03-19 | The calibration method and circuit of the blowout current of fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510122461.0A CN106033107B (en) | 2015-03-19 | 2015-03-19 | The calibration method and circuit of the blowout current of fuse |
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| Publication Number | Publication Date |
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| CN106033107A CN106033107A (en) | 2016-10-19 |
| CN106033107B true CN106033107B (en) | 2019-04-12 |
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| CN201510122461.0A Active CN106033107B (en) | 2015-03-19 | 2015-03-19 | The calibration method and circuit of the blowout current of fuse |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1784758A (en) * | 2003-05-16 | 2006-06-07 | 美国凹凸微系有限公司 | Circuit for trimming locking of integrated circuits |
| CN101283412A (en) * | 2005-10-07 | 2008-10-08 | 国际商业机器公司 | Electrically one time programmable and one time erasable fuse |
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| US7098721B2 (en) * | 2004-09-01 | 2006-08-29 | International Business Machines Corporation | Low voltage programmable eFuse with differential sensing scheme |
| US7224633B1 (en) * | 2005-12-08 | 2007-05-29 | International Business Machines Corporation | eFuse sense circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1784758A (en) * | 2003-05-16 | 2006-06-07 | 美国凹凸微系有限公司 | Circuit for trimming locking of integrated circuits |
| CN101283412A (en) * | 2005-10-07 | 2008-10-08 | 国际商业机器公司 | Electrically one time programmable and one time erasable fuse |
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