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 present invention relates to semiconductor fields, in particular to the calibration method and circuit of a kind of blowout current of fuse.
Background technique
As fuse (eFuse) theory is graduallyd mature with technology, the application range of eFuse is expanded rapidly.Wherein eFuse is mono-
The design of member is gradually converted into instantly commonly used electron transfer model from the design concept of original Rupture Model
(Electro Migration mode, referred to as EM model), to significantly improve the stability and reliability of eFuse cell, and
EFuse cell design for EM model, the stability and accuracy of blowout current become the key of design.
Traditional design method: the design aspect of current eFuse cell, due to control eFuse cell program current
Size is mainly realized by control switch NMOS, wherein control switch NMOS and eFuse resistance are concatenated, therefore when design
The deviation of program current brought by technique and application environment deviation is mainly overcome by relatively large channel length, it is this
The major defect of scheme is to significantly increase the chip area of eFuse cell, causes the face in large capacity eFuse module design
Product utilization rate is low；Secondly, technique and application still can only be weakened to a certain extent even with biggish channel length
Environmental deviation bring deviates, and improvement is relatively limited, not can guarantee the accuracy of blowout current.
Aiming at the problem that can not accurately control blowout current in the prior art, currently no effective solution has been proposed.
Summary of the invention
The main purpose of the present invention is to provide a kind of calibration method of the blowout current of fuse and circuits, existing to solve
The problem of blowout current can not be accurately controlled in technology.
To achieve the goals above, according to an aspect of an embodiment of the present invention, a kind of blowout current of fuse is provided
Calibration method, comprising: obtain duplication fuse cell in fuse pressure drop, wherein above-mentioned duplication fuse cell and standard replicated
Fuse cell is identical；The virtual voltage calculated between above-mentioned pressure drop and normal voltage is poor；Above-mentioned virtual voltage difference is converted into volume
Journey coding；And being switched on or off according to the NMOS transistor in above-mentioned programming coding-control standard replicated fuse cell,
To adjust the electric current for the fuse that above-mentioned standard duplication fuse cell is controlled.
Further, it includes: using analog to digital conversion circuit by above-mentioned virtual voltage that above-mentioned voltage difference, which is converted to programming coding,
Difference is converted to digital coding；Above-mentioned digital coding is input to and checks control logic unit；And it is patrolled using above-mentioned inspection control
It collects unit and above-mentioned digital coding is converted into above-mentioned programming coding.
Further, above-mentioned digital coding is converted into above-mentioned programming coding packet using above-mentioned inspection control logic unit
It includes:
Obtain the coding of reference voltage difference；Using above-mentioned digital coding compared with the coding of said reference voltage difference above-mentioned reality
The size of border voltage difference and said reference voltage difference；If above-mentioned virtual voltage difference is greater than said reference voltage difference, output subtracts
The programming coding of the quantity of the NMOS transistor be connected in few above-mentioned NMOS array；And if above-mentioned virtual voltage difference be less than it is upper
It states that reference voltage is poor, then exports the programming coding for the quantity for increasing the NMOS transistor be connected in above-mentioned NMOS array.
Further, above-mentioned digital coding is converted into above-mentioned programming coding packet using above-mentioned inspection control logic unit
It includes:
It obtains for programming the coding table of comparisons；And programming corresponding to above-mentioned digital coding is searched from the above-mentioned table of comparisons
Coding.
Further, using the conducting of the NMOS transistor in above-mentioned programming coding-control standard replicated fuse cell or
It disconnects, includes: to utilize one in above-mentioned programming coding to adjust the electric current for the fuse that above-mentioned standard duplication fuse cell is controlled
One or more NMOS transistor conducting in the coding-control above-mentioned standard duplication fuse cell of position；Or
Utilize one or more in the coding-control above-mentioned standard duplication fuse cell in above-mentioned programming coding
NMOS transistor disconnects.
Further, in obtaining duplication fuse cell before the pressure drop of fuse, above-mentioned calibration method further include: Xiang Shangshu
Predetermined current of the fuse cell offer for being programmed to fuse is provided.
To achieve the goals above, according to another aspect of an embodiment of the present invention, a kind of blowout current of fuse is provided
Calibration circuit, the calibration circuit of the blowout current of fuse according to the present invention includes: duplication fuse cell, including concatenated molten
Silk and NMOS transistor array；Voltage detecting circuit is connected with above-mentioned fuse, for detecting the voltage at above-mentioned fuse both ends；
Control logic unit is connected with above-mentioned voltage detecting circuit, for calculating the practical electricity between above-mentioned voltage and normal voltage
Pressure difference, and programming coding is exported according to above-mentioned virtual voltage difference；And standard replicated fuse cell, with above-mentioned control logic unit
It is connected, for the electric current according to the programming above-mentioned fuse of coding-control.
Further, above-mentioned control logic unit includes: analog to digital conversion circuit, input terminal and above-mentioned voltage detecting circuit
Output end is connected, for calculating above-mentioned virtual voltage difference and above-mentioned virtual voltage difference being converted to digital coding；Control logic
Circuit, input terminal are connected with the output end of above-mentioned analog to digital conversion circuit, for above-mentioned digital coding to be converted to programming coding.
Further, above-mentioned control logic unit includes multiple output ends, wherein each of above-mentioned multiple output ends are defeated
Outlet is connected with one or more NMOS transistor in above-mentioned standard duplication fuse cell.
Further, above-mentioned voltage detecting circuit is multiplexer, wherein is melted with above-mentioned the first test side of above-mentioned multiplexer
The first end of silk is connected, and the second test side is connected with the second end of above-mentioned fuse.
Using the technical solution of the application, predetermined current is not directlyed adopt as program current, but first obtains duplication
Pressure drop when standard replicated fuse cell is flowed through in the pressure drop of fuse in fuse cell, this pressure drop with predetermined current is identical, then passes through
Calculating voltage difference is crossed, code conversion is converted finally by digital coding, controls standard replicated fuse cell by programming coding
In NMOS transistor be switched on or off, and then school is carried out to the electric current for the fuse that standard replicated fuse cell is controlled
Standard meets by the program current that calibration obtains with technique and application environment well in this way, avoids with technique and using ring
The generation of the deviation for the actual program electric current that border needs greatly reduces deviation, greatly reduces or eliminate work
The difference of predetermined current and program current actually required caused by the deviation of skill and application environment, improves standard replicated fuse
The stability and accuracy for the fuse electric current that unit is controlled.
In addition, NMOS transistor all in the method all only needs to use the NMOS transistor compared with small channel length can
It is accurately calibrated with the electric current of the fuse of control, the area for replicating fuse cell is smaller；It does not need using larger ditch road length
The NMOS transistor of degree reduces the deviation of program current brought by technique and application environment deviation, and then overcomes large capacity
Replicate the low problem of area utilization in fuse cell design.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the calibration method of the blowout current of the fuse of the embodiment of the present invention；
Fig. 2 is the schematic diagram of the calibration circuit of the blowout current of the fuse of an embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of the calibration circuit of blowout current of the fuse of preferred embodiment of the present invention；And
Fig. 4 is a kind of structure of the standard replicated fuse cell comprising programmable NMOS array of preferred embodiment of the present invention
Schematic diagram.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
The embodiment of the invention provides a kind of calibration methods of the blowout current of fuse.
Fig. 1 is the flow chart of the calibration method of the blowout current of fuse according to an embodiment of the present invention.As shown in Figure 1, should
The calibration method of the blowout current of fuse includes the following steps:
Step S102 obtains the pressure drop of fuse in duplication fuse cell, wherein above-mentioned duplication fuse cell and standard replicated
Fuse cell is identical；
Step S104, the virtual voltage calculated between above-mentioned pressure drop and normal voltage are poor；
Above-mentioned virtual voltage difference is converted to programming coding by step S106；And
Step S108, according to the conducting of the NMOS transistor in above-mentioned programming coding-control standard replicated fuse cell or
It disconnects, to adjust the electric current for the fuse that above-mentioned standard duplication fuse cell is controlled.
Compared with prior art, the method does not directly adopt predetermined current as program current, but first obtains duplication
Pressure drop when standard replicated fuse cell is flowed through in the pressure drop of fuse in fuse cell, this pressure drop with predetermined current is identical, then passes through
Calculating and code conversion are crossed, the conducting or disconnected of the NMOS transistor in standard replicated fuse cell is controlled by programming coding
It opens, and then the electric current for the fuse that standard replicated fuse cell is controlled is calibrated, the programming electricity obtained in this way by calibration
Stream meets with technique and application environment well, avoids and the deviation of the actual program electric current of technique and application environment needs
Deviation is generated or greatly reduced, greatly reduces or eliminates and preset caused by the deviation of technique and application environment
The difference of electric current and program current actually required improves the stability for the fuse electric current that standard replicated fuse cell is controlled
With accuracy.
In addition, NMOS transistor all in the method all only needs to use the NMOS transistor compared with small channel length can
It is accurately calibrated with the electric current of the fuse of control, the area for replicating fuse cell is smaller；It does not need using larger ditch road length
The NMOS transistor of degree reduces the deviation of program current brought by technique and application environment deviation, and then overcomes large capacity
Replicate the low problem of area utilization in fuse cell design.
In order to which above-mentioned voltage difference to be accurately converted to programming coding, and then standard replicated fuse cell is controlled molten
The electric current of silk carries out further accurately calibration, improves the stability and essence of the fuse electric current that standard replicated fuse cell is controlled
Exactness, it includes: using analog to digital conversion circuit by above-mentioned virtual voltage that above-mentioned voltage difference is preferably converted to programming coding by the application
Difference is converted to digital coding；Above-mentioned digital coding is input to and checks control logic unit；And it is patrolled using above-mentioned inspection control
It collects unit and above-mentioned digital coding is converted into above-mentioned programming coding.
In another preferred embodiment of the application, using above-mentioned inspection control logic unit by above-mentioned digital coding
Being converted to above-mentioned programming coding includes: the coding for obtaining reference voltage difference；Utilize above-mentioned digital coding and said reference voltage difference
Coding more above-mentioned virtual voltage difference and said reference voltage difference size；If above-mentioned virtual voltage difference is greater than said reference
Voltage difference then exports the programming coding for the quantity for reducing the NMOS transistor be connected in above-mentioned NMOS array；And it is if above-mentioned
Virtual voltage difference is less than said reference voltage difference, then exports the quantity for increasing the NMOS transistor be connected in above-mentioned NMOS array
Programming coding.
A such as (output end in the two circuits in four analog to digital conversion circuits and eight NMOS programming coding circuits
A corresponding coding, the corresponding n NMOS transistor of a coding), " 0 " corresponding transistor disconnection in coding, " 1 " corresponds to transistor
Conducting, virtual voltage difference are input in analog to digital conversion circuit, are converted into 0101, and the digital coding of reference voltage difference is 1000, than
Compared with 0101 and 1000, the voltage of virtual voltage difference small three corresponding NMOS transistors of output end poorer than reference voltage is obtained, because
The programming coding of this output should be the coding for increasing 3n NMOS transistor of conducting, and the programming coding for calibration should be in base
Become 01111111 on the basis of the programming coding 00001111 of quasi- voltage difference, and then predetermined current increases 3n NMOS crystal
The electric current of pipe and, realize that the electric current of the fuse controlled to standard replicated fuse cell is calibrated.
This scheme only needs the digital coding of digital coding and virtual voltage difference by comparing reference voltage difference
Compare virtual voltage difference and said reference voltage difference, and then corresponding programming can be exported according to comparison result and encoded, i.e., should
Scheme can accurately obtain the conducting or disconnected of the NMOS transistor in control transistor array using better simply mode
The programming coding of quantity is opened, and then can control being switched on or off for NMOS transistor in transistor array, it is multiple to standard
The electric current for the fuse that fuse cell processed is controlled further is calibrated.
In another preferred embodiment of the application, preferably by above-mentioned inspection control logic unit by above-mentioned number
Code conversion is that above-mentioned programming coding includes: to obtain for programming the coding table of comparisons；Above-mentioned number is searched from the above-mentioned table of comparisons
The corresponding programming coding of coding.
Such as in above-mentioned 0101 example, 0101 corresponding programming directly is found in the programming coding table of comparisons 1 and is compiled
Code is 01111111, and the programming of reference voltage difference is encoded to 00001111, because " 0 " corresponding transistor disconnects in coding, " 1 " is right
Transistor turns are answered, so 3n NMOS transistor of conducting should be increased, and then predetermined current increases 3n NMOS transistor
Electric current and, realize that the electric current of the fuse controlled to standard replicated fuse cell is calibrated.
The table of comparisons is encoded according to programming, the corresponding programming coding of digital coding can be accurately acquired, further increased
The accuracy of the electric current for the fuse that standard replicated fuse cell is controlled is stated, in addition, since this method relatively can be obtained more quickly
The corresponding programming coding of digital coding is taken, i.e., only needs accurately obtain digital coding according to the programming coding table of comparisons corresponding
Programming coding, so that the efficiency for obtaining programming coding increases.
" 0 " and " 1 " respectively represents the off-state and on state of NMOS transistor in coding in the example above, is having
In the application of body, " 0 " and " 1 " are not limited to above-mentioned meaning, those skilled in the art can define according to the actual needs " 0 " with
The meaning of " 1 ", " 0 " can represent on state or represent off-state, and " 1 " can also represent on state or generation
Table off-state.
It is turned on or off to efficiently control NMOS transistor in standard replicated fuse cell, improves duplication fuse cell
Working efficiency, the application preferably by the NMOS transistor in above-mentioned programming coding-control standard replicated fuse cell conducting or
Person disconnects, and includes: when technique and application environment deviation to adjust the electric current for the fuse that above-mentioned standard duplication fuse cell is controlled
Brought program current often than normalized current hour needed for fuse, utilizes a coding-control in above-mentioned programming coding
Above-mentioned standard replicates one or more NMOS transistor conducting in fuse cell；Or work as technique and application environment deviation institute
When bring program current is often bigger than normalized current needed for fuse, using on a coding-control in above-mentioned programming coding
One or more NMOS transistor stated in standard replicated fuse cell disconnects.
In another preferred embodiment of the application, preferably obtain duplication fuse cell in fuse pressure drop it
Before, above-mentioned calibration method further include: provide the predetermined current for being programmed to fuse to above-mentioned duplication fuse cell.
The embodiment of the invention also provides a kind of calibration circuits of the blowout current of fuse.It should be noted that of the invention
The calibration circuit of the blowout current of the fuse of embodiment can be used for executing the fusing electricity of fuse provided by the embodiment of the present invention
The calibration method of the calibration method of stream, the blowout current of the fuse of the embodiment of the present invention can also be provided through the embodiment of the present invention
The calibration circuit of blowout current of fuse execute.
Fig. 2 is the schematic diagram of the calibration circuit of the blowout current of fuse according to an embodiment of the present invention.As shown in Fig. 2, molten
The calibration circuit of the blowout current of silk includes duplication fuse cell 10, voltage detecting circuit 30, control logic unit 50 and standard
Replicate fuse cell 70.Wherein,
Replicate fuse cell 10, including concatenated fuse and NMOS transistor array；
Voltage detecting circuit 30 is connected with above-mentioned fuse, for detecting the voltage at above-mentioned fuse both ends；
Control logic unit 50 is connected, for calculating above-mentioned voltage and normal voltage with above-mentioned voltage detecting circuit 30
Between virtual voltage difference and output programming coding；And
Standard replicated fuse cell 70 is connected with above-mentioned control logic unit 50, controls for being encoded according to the programming
Make the electric current of the fuse.
The calibration circuit of the blowout current of above-mentioned fuse does not directly adopt predetermined current as program current, but
The pressure drop of fuse in duplication fuse cell is obtained using voltage detecting circuit 30 first, the pressure drop of fuse is answered with standard is designed for
The pressure drop at fuse cell both ends processed is identical, then using control logic unit carry out calculate with it is encoded translated, finally by control
The programming of logic unit output encodes to control being switched on or off for the NMOS transistor in standard replicated fuse cell, in turn
The electric current for the fuse that standard replicated fuse cell is controlled is calibrated.In this way by the program current and technique of calibration acquisition
And application environment meets well, avoid and the generation of the deviation of actual program electric current that technique and application environment need or
Deviation is greatly reduced, predetermined current caused by the deviation of technique and application environment and reality are greatly reduced or eliminate
The difference for the program current that border needs improves the stability of the fuse electric current that standard replicated fuse cell is controlled and accurate
Degree.
Compared with prior art, the present embodiment is the pressure drop for first obtaining fuse in duplication fuse cell, this pressure drop and default
Pressure drop when electric current flows through standard replicated fuse cell is identical, then by calculating and code conversion, is controlled by programming coding
NMOS transistor in standard replicated fuse cell processed is switched on or off, and then standard replicated fuse cell is controlled
The electric current of fuse is calibrated, and is met by the program current that calibration obtains with technique and application environment well in this way, is avoided
And the generation of the deviation for the actual program electric current that technique and application environment need greatly reduces deviation, greatly
The difference for reducing or eliminating predetermined current caused by the deviation of technique and application environment and program current actually required, mentions
The stability and accuracy for the fuse electric current that high standard replicated fuse cell is controlled.
In addition, NMOS transistor all in this circuit is all only needed using the NMOS transistor compared with small channel length, just
The electric current for the fuse that can control accurately is calibrated, and the area for replicating fuse cell is smaller；It does not need using larger channel
The NMOS transistor of length reduces the deviation of program current brought by technique and application environment deviation, and then overcomes great Rong
Amount replicates the low problem of the area utilization in fuse cell design.
In order to improve the precision for the blowout current that the calibration circuit of the blowout current of fuse is calibrated, and then improve standard replicated
The stability and accuracy for the fuse electric current that fuse cell is controlled, the preferably above-mentioned control logic unit of the application includes: modulus
Conversion circuit, input terminal are connected with the output end of above-mentioned voltage detecting circuit, obtain above-mentioned virtual voltage difference simultaneously for calculating
Above-mentioned virtual voltage difference is converted into digital coding；Control logic circuit, the output end of input terminal and above-mentioned analog to digital conversion circuit
It is connected, for above-mentioned digital coding to be converted to programming coding.
In another preferred embodiment of the application, preferably above-mentioned control logic unit includes multiple output ends,
In: one or more NMOS crystal in each output end and above-mentioned standard duplication fuse cell in above-mentioned multiple output ends
Pipe is connected.When the quantity for the NMOS transistor that standard replicated fuse cell includes is more, each output end and above-mentioned standard
The multiple NMOS transistors of person in duplication fuse cell are connected, and more output is needed this avoid control logic unit
End, the more complex problem of the manufacture craft of the control logic unit in turn resulted in；As the NMOS that standard replicated fuse cell includes
When the negligible amounts of transistor, each output end is connected with one NMOS transistor of person in above-mentioned standard duplication fuse cell
It connects, each output end can be made accurately to control the conducting and disconnection of a NMOS transistor, further increase the fusing electricity of fuse
The accuracy of the calibration circuit calibration electric current of stream.
In order to facilitate the pressure drop for obtaining fuse both ends, the preferably above-mentioned voltage detecting circuit of the application is multiplexer, wherein on
The first test side for stating multiplexer is connected with the first end of above-mentioned fuse, and the second test side is connected with the second end of above-mentioned fuse
It connects.
In order to enable those skilled in the art clearly to understand the technical solution of the application, below with reference to attached drawing
And with four analog to digital conversion circuits, eight NMOS are encoded to embodiment and the scheme of the application are described in detail.
Firstly, duplication fuse cell 10 offer into Fig. 3 is designed for the fuse that standard replicated fuse cell is controlled
Blowout current, i.e. predetermined current, m transistor turns in corresponding standard replicated fuse cell 10, m is natural number.
Then, go out the electricity that circuit 30 detects above-mentioned fuse both ends using the voltage detecting being connected with the both ends of above-mentioned fuse
Pressure, it is multiplexer that voltage detecting herein, which goes out circuit 30,.
Secondly, exporting programming coding using control logic unit 50.
The output voltage of voltage detecting circuit 30 and normal voltage are input in analog to digital conversion circuit 51, the two is done
Difference, it is poor to obtain virtual voltage, and virtual voltage difference is converted to digital coding using analog to digital conversion circuit 51.Assuming that practical at this time electric
The corresponding digital coding of pressure difference is 1011, and " 0 " corresponding transistor disconnects in coding, " 1 " corresponding transistor turns.
The digital coding 1011 that analog to digital conversion circuit exports is input in control logic circuit 52, control logic circuit 52
According to shown in table 1 programming coding the table of comparisons obtain 1011 it is corresponding be encoded to 00000001, reference voltage difference is corresponding
Digital coding is 1000, it is corresponding be encoded to 00001111,00000001 with 00001111 comparison known to virtual voltage it is poor
The voltage of big three corresponding NMOS transistors of output end poorer than reference voltage, so by being preset in standard replicated fuse cell 70
The number of the corresponding transistor of electric current is reduced to m-3n by m, and wherein n is that the output end of a control logic circuit 50 corresponds to NMOS
The number of transistor.
Finally, encoding 00000001 for the corresponding 3n NMOS of 50 3 output ends of control logic circuit using above-mentioned programming
Transistor and standard replicated fuse cell 70 disconnect.As shown in figure 4, b0, b1, b2 ..., the control signal of b7 is corresponded to
00000001, wherein 1 indicates the fusing for enabling the NMOS transistor for fuse.
Table 1
It can be seen from the above description that the application the above embodiments realize following technical effect:
Compared with prior art, the calibration method of the blowout current of the fuse of the application does not directly adopt default with circuit
Electric current first obtains the pressure drop of fuse in duplication fuse cell as program current, this pressure drop and predetermined current flow through standard
Pressure drop when replicating fuse cell is identical, and then by calculating, code conversion is converted finally by digital coding, passes through programming
It encodes to control being switched on or off for the NMOS transistor in standard replicated fuse cell, and then to standard replicated fuse cell
The electric current of the fuse controlled is calibrated, and is accorded with well by the program current that calibration obtains with technique and application environment in this way
It closes, avoid and the generation of the deviation of actual program electric current that technique and application environment need or greatly reduces deviation
Value, greatly reduces or eliminates predetermined current caused by the deviation of technique and application environment and program current actually required
Difference, improve the stability and accuracy of the fuse electric current that standard replicated fuse cell is controlled.
In addition, NMOS transistor all in the method and circuit is all only needed using the NMOS crystal compared with small channel length
The electric current for the fuse that pipe can control accurately is calibrated, and the area for replicating fuse cell is smaller；It does not need using larger
The NMOS transistor of channel length reduces the deviation of program current brought by technique and application environment deviation, and then overcomes
Large capacity replicates the low problem of the area utilization in fuse cell design.
It should be noted that for the various method embodiments described above, for simple description, therefore, it is stated as a series of
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described because
According to the present invention, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art should also know
It knows, the embodiments described in the specification are all preferred embodiments, and related actions and modules is not necessarily of the invention
It is necessary.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, reference can be made to the related descriptions of other embodiments.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of calibration method of the blowout current of fuse characterized by comprising
Obtain the pressure drop of fuse in duplication fuse cell, wherein the duplication fuse cell is identical as standard replicated fuse cell；
The virtual voltage calculated between the pressure drop and normal voltage is poor；
The virtual voltage difference is converted into programming coding；And
According to being switched on or off for the NMOS transistor in standard replicated fuse cell described in the programming coding-control, to adjust
The electric current for the fuse that the whole standard replicated fuse cell is controlled；
Wherein, in four analog to digital conversion circuits and eight NMOS programming coding circuits, 0 corresponding transistor is disconnected in coding, and 1 pair
Transistor turns are answered, the virtual voltage difference is input in analog to digital conversion circuit, is converted into 0101, the number of reference voltage difference is compiled
Code is 1000, compares 0101 and 1000, obtains the voltage of the NMOS transistor, and exports programming coding, wherein the programming
Coding is the coding obtained by the way that 3n NMOS transistor is connected.
2. calibration method according to claim 1, which is characterized in that the virtual voltage difference is converted to programming coding packet
It includes:
The virtual voltage difference is converted into digital coding using analog to digital conversion circuit；
The digital coding is input to and checks control logic unit；And
The digital coding programming is converted to using the inspection control logic unit to encode.
3. calibration method according to claim 2, which is characterized in that utilize the inspection control logic unit by the number
Word code conversion is that programming coding includes:
Obtain the coding of reference voltage difference；
Using the digital coding, the virtual voltage difference and the reference voltage are poor compared with the coding of the reference voltage difference
Size；
If the virtual voltage difference is greater than, the reference voltage is poor, and it is brilliant to export the NMOS for reducing and being connected in the NMOS array
The programming of the quantity of body pipe encodes；And
If the virtual voltage difference is less than, the reference voltage is poor, and it is brilliant to export the NMOS for increasing and being connected in the NMOS array
The programming of the quantity of body pipe encodes.
4. calibration method according to claim 2, which is characterized in that utilize the inspection control logic unit by the number
Word code conversion is that programming coding includes:
It obtains for programming the coding table of comparisons；And
The coding of programming corresponding to the digital coding is searched from the table of comparisons.
5. calibration method according to claim 1, which is characterized in that according to the programming coding-control standard replicated fuse
NMOS transistor in unit is switched on or off, to adjust the electric current for the fuse that the standard replicated fuse cell is controlled
Include:
Utilize one or more NMOS in standard replicated fuse cell described in a coding-control in the programming coding
Transistor turns；Or
Utilize one or more NMOS in standard replicated fuse cell described in a coding-control in the programming coding
Transistor disconnects.
6. calibration method according to claim 1, which is characterized in that obtain duplication fuse cell in fuse pressure drop it
Before, the calibration method further include:
The predetermined current for being programmed to fuse is provided to the duplication fuse cell.
7. a kind of calibration circuit of the blowout current of fuse characterized by comprising
Replicate fuse cell, including concatenated fuse and NMOS transistor array；
Voltage detecting circuit is connected with the fuse, for detecting the voltage at the fuse both ends；
Control logic unit is connected with the voltage detecting circuit, for calculating the reality between the voltage and normal voltage
Border voltage difference, and programming coding is exported according to the virtual voltage difference；And
Standard replicated fuse cell is connected with the control logic unit, for melting according to the programming coding-control
The electric current of silk；
Wherein, in four analog to digital conversion circuits and eight NMOS programming coding circuits, 0 corresponding transistor is disconnected in coding, and 1 pair
Transistor turns are answered, the virtual voltage difference is input in analog to digital conversion circuit, is converted into 0101, the number of reference voltage difference is compiled
Code is 1000, compares 0101 and 1000, obtains the voltage of the NMOS transistor, and exports programming coding, wherein the programming
Coding is the coding obtained by the way that 3n NMOS transistor is connected.
8. calibration circuit according to claim 7, which is characterized in that the control logic unit includes:
Analog to digital conversion circuit, input terminal are connected with the output end of the voltage detecting circuit, for calculating the virtual voltage
The virtual voltage difference is simultaneously converted to digital coding by difference；
Control logic circuit, input terminal are connected with the output end of analog-digital conversion circuit as described, for turning the digital coding
It is changed to programming coding.
9. calibration circuit according to claim 7, which is characterized in that the control logic unit includes multiple output ends,
Wherein,
One or more NMOS in each output end and the standard replicated fuse cell in the multiple output end is brilliant
Body pipe is connected.
10. calibration circuit according to claim 7, which is characterized in that the voltage detecting circuit is multiplexer, wherein
First test side of the multiplexer is connected with the first end of the fuse, the second test side and the second of the fuse
End is connected.
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|---|---|---|---|---|
| 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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