CN101644937B - Circuit for adjusting reference voltage through adjustable fuse - Google Patents
Circuit for adjusting reference voltage through adjustable fuse Download PDFInfo
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- CN101644937B CN101644937B CN2008101452566A CN200810145256A CN101644937B CN 101644937 B CN101644937 B CN 101644937B CN 2008101452566 A CN2008101452566 A CN 2008101452566A CN 200810145256 A CN200810145256 A CN 200810145256A CN 101644937 B CN101644937 B CN 101644937B
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- resistor group
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Abstract
The invention provides a circuit for adjusting reference voltage through an adjustable fuse. The adjustable circuit comprises a first resistor group providing an adjusting step, a second resistor group providing eight adjusting steps, a third resistor group providing two adjusting steps, a fourth resistor group providing four adjusting steps, a first load resistor and a second load resistor; the first resistor group, the second resistor group, the first load resistor, the third resistor group and the fourth resistor group are connected in series with two load resistors. Furthermore, the position of the output end is at a node between the third resistor group and the first load resistor, so that the adjusting steps provided by the third resistor group and the fourth resistor group are just opposite to those provided by the first resistor group and the second resistor group. The adjusting steps of are bidirectional, the detecting time is saved, and possible chip damage caused by the burning of the fuse is reduced.
Description
Technical field
The present invention is relevant with a kind of adjustable fuse circuit, is meant the adjustable fuse circuit that a kind of binary is two-way especially.
Background technology
Recently, because the progress of semi-conductor industry photoetching and lithographic technique, make that the integration of one chip almost is three orders of magnitude before 10 years.In order to finish highdensity integrated circuit component like this, sophisticated semiconductor technology is undoubtedly to have maximum contribution, and in addition, data repair notion and adjustable fuse circuit equally also have contribution considerably.In the process of each semiconductor fabrication, must utilize high-tech to go to handle accurately and control all technologies.Particularly in deep-sub-micrometer epoch, can be described as the nanometer stage that is in even, work as active member, for example: metal-oxide-semiconductor (MOS), two-carrier transistor etc., and passive device, for example: resistance, electric capacity etc., on technology, have and permitted to miss the season a bit by mistake, the loss on the production capacity is caused in the capital, and one of them reason is exactly when these elements are micro element, and the concentration that impurity is mixed in control is to be sensitive to very much to mix and the condition of tempering.
Therefore, in order to improve yield (yield), the electrical property efficiency of back wafer is lower than original expection and again when a permissible situation, just can utilizes an adjustable fuse circuit to adjust values of circuit resistances after testing.Generally speaking, adjustable fuse circuit has comprised a plurality of fuses, number control signal and several serial or parallel connection resistance in order to adjust the current path of suitable or needs.In case it is required that the electrical property efficiency after tested satisfies, just keep this current path, then, utilize the mode that passes to high electric current or laser that the fuse of redundancy is burnt again.
Specifically, battery protection ic needs the reference voltage (+/-0.5%) of pin-point accuracy.Yet, because the reference voltage that inevitable fabrication error causes obtaining a pin-point accuracy and high production capacity in the IC technology is very difficult.Usually can utilize binary search (binary search) method to adjust and reduce required fuse number.
With regard to adjustable circuit of the prior art, please refer to shown in Figure 1ly, be a circuit of having simplified, this phone includes fuse F1, F2, F4, F8 and several resistance.All resistance all has identical resistance value R, and is arranged in 16 kinds of combinations in the mode of serial or parallel connection.Fuse F1, F2, F4 and F8 insert the node between GND-A, A-B, B-C and the C-D.Between the GND-A node, four resistance are arranged in parallel, and therefore, when fuse F1 burnt, output terminal OUT resistance value can increase 1/4R.Between the A-B node, two resistance are arranged in parallel, and therefore, when fuse F2 burnt, output terminal OUT resistance value can increase 1/2R.Have a resistance between the B-C node, therefore, when fuse F4 burnt, output terminal OUT resistance value can increase R.Between the C-D node, two resistance are arranged in the mode of series connection, and therefore, when fuse F8 burnt, output terminal OUT resistance value can increase 2R.
Therefore, when fuse F1, F2, F4 and F8 short circuit, be equivalent to the resistance of 1,2,4 and 8 unit respectively.The resistance of each unit all is defined as a set-up procedure, utilizes a high electric current by these fuses, or removes to burn fuse with laser or other method, just can reach the purpose of adjusting reference voltage.According to this method, the reference voltage of this design is so that to be lower than desired value be purpose and carry out follow-up adjustment.
It should be noted that these set-up procedures all are positive.The arrangement mode that these set-up procedures are possible and with the fuse that burns between relevant binding row as shown in table 1.
Table 1
| The fuse that burns | F1 | F2 | F1， F2 | F4 | F1， F4 | F2， F4 | F1， F2， F4 | F8 | F1， F8 | F2， F8 | F1， F2， F8 | F4， F8 | F1， F4， F8 | F2， F4， F8 | F1， F2， F4， F8 |
| The set-up procedure number | +1 | +2 | +3 | +4 | +5 | +6 | +7 | +8 | +9 | +10 | +11 | +12 | +13 | +14 | +15 |
Therefore, circuit as shown in Figure 1 only can provide the adjustment of single direction, always has only positive or negatively just as set-up procedure, and result such as table 1 are listed.In addition, the relation between fuse set-up procedure number similarly is a kind of binary code, respectively with F1, F2, F4 and F8 as lowest order, second, the 3rd and most significant digit.For example: 11 set-up procedures are equivalent to burn fuse F1, F2 and F8, and its total set-up procedure number is 1+2+8.
Certainly, also might need to burn all fuses go up to specification, yet, the burning program and can't reach 100% effect of fuse, sometimes it may also can damage its internal circuit, simultaneously, also can increase the time of chip detection.
In fact, each adjusts the specification value that parameter all has a tool bound, for example: the start voltage of battery protection ic (4.3V+/-25mV).And the variation of IC technology also is less than in the past now, so, if we design one to meet the reference voltage that the ideal format value is a purpose, just can avoid burning of some fuse.
Summary of the invention
The invention provides the two-way adjustable fuse circuit of a binary.
According to the present invention, this binary bi-directional adjustable fuse circuit comprises: first resistor group, this first resistor group have four resistance that connect with parallel way and connect the two ends of this resistor group so that a set-up procedure to be provided with one first fuse;
Second resistor group, this second resistor group have two resistance that connect with series system and connect the two ends of this resistor group so that eight set-up procedures to be provided with one second fuse;
The 3rd resistor group, the 3rd resistor group have two resistance that connect with parallel way and connect the two ends of this resistor group so that two set-up procedures to be provided with one the 3rd fuse;
The 4th resistor group, the 4th resistor group have a resistance and connect the two ends of this resistor group so that four set-up procedures to be provided with one the 4th fuse;
Also comprise one first pull-up resistor and second pull-up resistor.
According to first preferred embodiment of the present invention, first resistor group, second resistor group, first resistor group, first pull-up resistor, the 3rd resistor group, the 4th resistor group and second pull-up resistor link with series system.To such an extent as to the set-up procedure that the node of output terminal position between the 3rd resistor group and first pull-up resistor provided by the 3rd resistor group and the 4th resistor group just and by first resistor group and second resistor group provided opposite.
In second preferred embodiment, second resistor group, first pull-up resistor, the 3rd resistor group, first resistor group, the 4th resistor group and second pull-up resistor then are to link with series system.To such an extent as to the set-up procedure that the node of output terminal position between the 3rd resistor group and first pull-up resistor provided by first resistor group, the 3rd resistor group and the 4th resistor group just and by second resistor group provided opposite.
Set-up procedure of the present invention is two-way, and saves detection time, and reduces because of fuse burns the chip that institute may cause and damage.
Description of drawings
Preferred embodiment of the present invention will be aided with following figure and do more detailed elaboration in comment backward:
Fig. 1 shows the synoptic diagram that forms the unidirectional adjustable fuse circuit of a binary according to the method for prior art;
Fig. 2 shows the synoptic diagram that forms a binary bi-directional adjustable fuse circuit according to the method for the present invention's first preferred embodiment; And
Fig. 3 shows the synoptic diagram that forms a binary bi-directional adjustable fuse circuit according to the method for the present invention's second preferred embodiment.
The main element symbol description
The F1 first fuse F2 the 3rd fuse
The F8 second fuse F4 the 4th fuse
R
1～R
8Resistance
R
L1The first pull-up resistor R
L2Second pull-up resistor
10 first resistor group 20 the 3rd resistor group
30 second resistor group 40 the 4th resistor group
50 voltage sources
S
A, S
B, S
C, S
D, S
EControl signal
A, B, C, D node
Embodiment
Please refer to shown in Figure 1ly, the adjustable circuit of a binary all is to increase with 2 n power because of its self-reference earth point to the set-up procedure number of output terminal, and wherein n is 0,1,2 and 3, and the output terminal of above-mentioned circuit is positioned on the most significant digit, so the adjustment of user's single direction only can be provided.Sometimes, a kind of method that can two-way adjustment is often saved the time of detecting required cost.Therefore, trimming circuit method provided by the invention is to utilize binary bi-directional adjustable circuit to solve the problem that is met with in the prior art.
With reference to shown in Figure 2, the resistance total quantity is identical with Fig. 1, but has changed the arrangement mode of node and output terminal.One binary bi-directional adjustable circuit is by 10,20,30,40 and two pull-up resistor R of four resistor group
L1, R
L2Form.
This circuit comprises (1) first resistor group 10, and 4 resistance R 1 that link with parallel way are arranged, and R2, R3, R4 and one first fuse F1 connect the two ends of this resistor group so that a set-up procedure to be provided; (2) second resistor group 20 have two resistance R 5 that link with series system, and R6 and one second fuse F8 connect the two ends of this resistor group so that eight set-up procedures to be provided; (3) the 3rd resistor group 30 have two resistance R 7 that link with parallel way, and R8 and one the 3rd fuse F2 connect the two ends of this resistor group so that two set-up procedures to be provided; (4) the 4th resistor group 40 have a resistance R 9 and one the 4th fuse F4 to connect the two ends of this resistor group so that four set-up procedures to be provided; (5) one first pull-up resistor R
L1(6) one second pull-up resistor R
L2(7) one voltage sources 50.Subsequently, please continue 10,20,30,40 and two pull-up resistor R of these four resistor group with reference to figure 2
L1, R
L2Mode with series connection is arranged as follows from earth terminal (GND): GND, first resistor group, 10, the second resistor group, 20, the first pull-up resistor R
L1, the 3rd resistor group 30, the four resistor group 40, the second pull-up resistor R
L2With voltage source 50.
Then, output terminal OUT is positioned at the node between the 3rd resistor group and first pull-up resistor.Therefore, this output terminal OUT position is that the position is under the 3rd resistor group 30 and the 4th resistor group 40, and on first resistor group 10 and second resistor group 20.Since the former two 30,40th, on output terminal OUT, therefore, this 30,40 influence for this circuitous resistance is equivalent to the negative justification step, and is opposite with both influences of 10,20 positive justification steps of back.
And then, can calculate by simple, as: add, subtract or both all can, with four kinds of possible arrangement modes that obtain this set-up procedure be :-4 ,-2 ,+8 and+1, its result is as shown in table 2:
Table 2
(meaning that is meant " nothing " of the X representative here)
Therefore, the adjustable circuit of this binary can provide and carry out asymmetry ground " just " or " bearing " adjustment two-wayly.We can utilize this " just " or " bearing " set-up procedure to adjust reference point.Then, after fuse is burnt, can utilize control signal S
A, S
B, S
C, S
D, S
EGo near this desired value.
The aforementioned embodiment that carries sets forth the present invention for convenience, is not in order to limit claim, to lift an example, even the 4th resistor group 40 and the 3rd resistor group 30 switches or first resistor group, 10, the second resistor group 20 and the first pull-up resistor R
L1Link the plus or minus set-up procedure that can not change this binary bi-directional adjustable circuit with different order series connection.
Simultaneously, this binary bi-directional adjustable circuit output end OUT also can revise the position and make positive justification number of steps and negative justification number of steps comparatively symmetrical.Please refer to shown in Figure 3,10,20,30,40 and two pull-up resistor R of these four resistor group
L1, R
L2Mode with series connection is arranged as follows from earth terminal (GND):
GND, second resistor group, 20, the first pull-up resistor R
L1, the 3rd resistor group 30, the first resistor group 10, the four resistor group 40, the second pull-up resistor R
L2With voltage source 50.Then, output terminal OUT is positioned at the node between the 3rd resistor group and first pull-up resistor.Subsequently, can calculate by simple, as: add, subtract or both all can, four kinds of possible arrangement modes that obtain this set-up procedure are :-4 ,-2 ,-8 and+8, its result is as shown in table 3:
Table 3
Benefit of the present invention is:
(1) set-up procedure is two-way.
(2) save detection time.
(3) reduce because of fuse burns the chip that institute may cause and damage.
Though the present invention illustrates as above with preferred embodiments, so it is not only to terminate in the foregoing description in order to limit the present invention's spirit with the invention entity.Usually know the knowledgeable to having in the affiliated technical field, when understanding and utilize other element or mode to produce identical effect easily.For example: in four resistor group described in the preferred embodiment only for convenience of description, spirit of the present invention certainly extends to N resistor group.Be with, the modification of being done in not breaking away from spirit of the present invention and scope all should be included in the claim scope.
Claims (10)
1. a binary bi-directional adjustable circuit is characterized in that, this binary bi-directional adjustable circuit comprises at least:
One first resistor group, this first resistor group have four two ends that connect described resistor group with the resistance and one first fuse of parallel way binding so that a set-up procedure to be provided;
One second resistor group, this second resistor group have two two ends that connect described resistor group with the resistance and one second fuse of series system binding so that eight set-up procedures to be provided;
One the 3rd resistor group, the 3rd resistor group have two two ends that connect described resistor group with the resistance and one the 3rd fuse of parallel way binding so that two set-up procedures to be provided;
One the 4th resistor group, the 4th resistor group have resistance and one the 4th fuse to connect the two ends of described resistor group so that four set-up procedures to be provided;
One first pull-up resistor; And
One second pull-up resistor;
All wherein above-mentioned resistance, except described pull-up resistor, identical resistance value is all arranged, and described pull-up resistor, described first resistor group, described second resistor group, described the 3rd resistor group, described the 4th resistor group is arranged with a predetermined order series system, and one end ground connection, and the other end then connects voltage source; Subsequently, described predetermined putting in order makes output terminal select to provide one first positive digital set-up procedure and the second negative tone of Chinese characters synchronizing rapid from tie point, and the described second negative word is that described first positive digital deducts the result after 15 again.
2. binary bi-directional adjustable circuit as claimed in claim 1 is characterized in that making the numeral of winning by the preceding order that determines is 8, and second numeral is 7.
3. binary bi-directional adjustable circuit as claimed in claim 2, it is characterized in that, described is described first resistor group by predetermined order, described the 3rd resistor group, described the 4th resistor group is positioned at the top of described output terminal, and described second resistor group and described first pull-up resistor are positioned at the below of described output terminal.
4. binary bi-directional adjustable circuit as claimed in claim 1 is characterized in that, making the numeral of winning by predetermined order is 9, and second numeral is 6.
5. binary bi-directional adjustable circuit as claimed in claim 4, it is characterized in that, described is described the 3rd resistor group by predetermined order, described the 4th resistor group is positioned at the top of described output terminal, and described first resistor group, described second resistor group and described first pull-up resistor are positioned at the below of described output terminal.
6. a binary bi-directional adjustable circuit is characterized in that, this binary bi-directional adjustable circuit comprises at least:
One first resistor group has four two ends that connect described resistor group with the resistance and one first fuse of parallel way binding so that a set-up procedure to be provided;
One second resistor group has two two ends that connect described resistor group with the resistance and one second fuse of series system binding so that eight set-up procedures to be provided;
One the 3rd resistor group has two two ends that connect described resistor group with the resistance and one the 3rd fuse of parallel way binding so that two set-up procedures to be provided;
One the 4th resistor group has resistance and one the 4th fuse to connect the two ends of described resistor group so that four set-up procedures to be provided;
One first pull-up resistor; And
One second pull-up resistor;
All wherein above-mentioned resistance except described pull-up resistor, all have identical resistance value, and described first resistor group, and described second resistor group and first pull-up resistor are arranged with series system by predetermined order, and one end ground connection, and the other end then is an output terminal; Moreover, described the 3rd resistor group, described the 4th resistor group is connected with series system with described second pull-up resistor, a termination voltage source wherein, and the other end connects above-mentioned output terminal.
7. binary bi-directional adjustable circuit as claimed in claim 1, it is characterized in that, described binary bi-directional adjustable circuit also comprises the one first control signal link and the second control signal link, lays respectively at the tie point of described first resistor group and described second resistor group and the tie point of described second resistor group and described first pull-up resistor and joins.
8. binary bi-directional adjustable circuit as claimed in claim 1, it is characterized in that, described binary bi-directional adjustable circuit also comprises one the 3rd control signal link and the 4th control signal link, lays respectively at the tie point of described the 3rd resistor group and described the 4th resistor group and the tie point of described the 4th resistor group and described second pull-up resistor and joins.
9. binary bi-directional adjustable circuit as claimed in claim 1 is characterized in that, described first resistor group, described second resistor group and described first pull-up resistor conversion series system that can differently put in order.
10. binary bi-directional adjustable circuit as claimed in claim 1 is characterized in that, described the 3rd resistor group, described the 4th resistor group and described second pull-up resistor conversion series system that can differently put in order.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101452566A CN101644937B (en) | 2008-08-04 | 2008-08-04 | Circuit for adjusting reference voltage through adjustable fuse |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101452566A CN101644937B (en) | 2008-08-04 | 2008-08-04 | Circuit for adjusting reference voltage through adjustable fuse |
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| Publication Number | Publication Date |
|---|---|
| CN101644937A CN101644937A (en) | 2010-02-10 |
| CN101644937B true CN101644937B (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101452566A Expired - Fee Related CN101644937B (en) | 2008-08-04 | 2008-08-04 | Circuit for adjusting reference voltage through adjustable fuse |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106292827B (en) | 2016-08-18 | 2018-09-21 | 华为技术有限公司 | A kind of device for generating voltage and semiconductor chip |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5150216A (en) * | 1990-04-13 | 1992-09-22 | Kabushiki Kaisha Toshiba | Solid-state image sensing device having an optimum overflow drain voltage generation circuit |
| US6359428B1 (en) * | 1999-07-02 | 2002-03-19 | Rohm Co. Ltd. | Semiconductor integrated circuit device having an output voltage setting function |
| WO2007099980A1 (en) * | 2006-03-03 | 2007-09-07 | Ricoh Company, Ltd. | Voltage divider, constant voltage circuit using same, and trimming method in the voltage divider circuit |
-
2008
- 2008-08-04 CN CN2008101452566A patent/CN101644937B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5150216A (en) * | 1990-04-13 | 1992-09-22 | Kabushiki Kaisha Toshiba | Solid-state image sensing device having an optimum overflow drain voltage generation circuit |
| US6359428B1 (en) * | 1999-07-02 | 2002-03-19 | Rohm Co. Ltd. | Semiconductor integrated circuit device having an output voltage setting function |
| WO2007099980A1 (en) * | 2006-03-03 | 2007-09-07 | Ricoh Company, Ltd. | Voltage divider, constant voltage circuit using same, and trimming method in the voltage divider circuit |
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| CN101644937A (en) | 2010-02-10 |
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