CN209731200U - A kind of realization circuit of high-precision absolute voltage comparator - Google Patents
A kind of realization circuit of high-precision absolute voltage comparator Download PDFInfo
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- CN209731200U CN209731200U CN201920489655.8U CN201920489655U CN209731200U CN 209731200 U CN209731200 U CN 209731200U CN 201920489655 U CN201920489655 U CN 201920489655U CN 209731200 U CN209731200 U CN 209731200U
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Abstract
The utility model discloses the realization circuits of one of IC design technical field high-precision absolute voltage comparator, including comparator, input voltage signal and reference voltage, one input terminal of comparator is by the first divider resistance concatenation ground, and the first divider resistance string includes the first divider resistance and at least one first trims resistance；The input terminal of comparator also passes through the second divider resistance string and connect with input voltage signal, and the second divider resistance string includes the second divider resistance and at least one second trims resistance；Each first trims resistance and each second to trim resistance in parallel with corresponding metal fuse.The utility model can trim single resistors match error/amplifier input random fit error/reference source voltage random error, obtain the voltage comparator of required absolute precision, and overriding precision is high, it entirely trims easy to operate, it saves and trims required time and process costs, there is broad applicability.
Description
Technical field
The utility model relates to IC design technical fields, in particular to a kind of high-precision absolute voltage
The realization circuit of comparator.
Background technique
In IC design production, uses comparator and input voltage is compared.Comparator is to simulate one
Circuit of the voltage signal Vin compared with a reference voltage Vref.The two-way input of comparator is analog signal, and output is then
Binary signal 0 or 1,0 or 1 is indicated using low level and high level respectively.When the difference of input voltage increases or reduces and just
When minus symbol is constant, output is kept constant.And can not accomplish that high-precision detects when comparator work, the reason is as follows that:
(1) precision of comparator is mainly determined by the input constant error of the open-loop gain of amplifier A and comparator.For
For the integrated circuit of large-scale production, the constant error of input is by the matching error between each device in amplifier A
It determines, the amplifier produced using CMOS technology is bigger relative to the error originated from input of the amplifier using the production of BJT technology, practical
It is in normal distribution in production.In circuit design process, certain control can be done to the open-loop gain of cmos amplifier, from knot
Open-loop gain is improved on structure, needs to do other indexs certain balance accordingly.But production error be it is uncontrollable,
The control errors of precision are not can guarantee yet within a certain range in large-scale production.
That is the detection accuracy of the input matching error influence comparator of amplifier A open loop.
(2) reference voltage Vref is generated by reference voltage generating circuit, no matter reference voltage why, when batch production, produce
Raw voltage Vref can generate the error of normal distribution because of technique random fluctuation.
That is the detection accuracy of the random errors affect comparator of reference voltage Vref.
(3) in addition, comparator is needed in a few thing occasion (such as in Li battery protection IC course of work) to power supply
Voltage is detected, and needs to be grounded after input power connects two divider resistances, the input terminal of amplifier A and two partial pressure electricity
The midpoint of resistance connects.And due in the production of specific mass wafer, the ratio of two divider resistances because resistance matching
Reason can also generate error compared with design value, as a result be in normal distribution.
That is the random fit error of series connection divider resistance influences the detection accuracy of comparator.
Therefore, it needs to overcome drawbacks described above source in IC design, just can solve the precision of comparator
Low problem, and in existing IC design, no corresponding structure or method is adjusted, and influences the high-precision of comparator
It realizes.
Summary of the invention
In order to overcome the shortcomings of existing technology, the utility model provides a kind of realization of high-precision absolute voltage comparator
Circuit.
Technical solutions of the utility model are as described below:
A kind of realization circuit of high-precision absolute voltage comparator, including comparator, input voltage signal and reference voltage,
One input terminal of the comparator is connect with the reference voltage, which is characterized in that
Another input terminal of the comparator includes the by the first divider resistance concatenation ground, the first divider resistance string
One divider resistance and first trims resistance string, and described first to trim resistance string include that at least one first trims resistance；
Another input terminal of the comparator also passes through the second divider resistance string and connect with the input voltage signal, institute
Stating the second divider resistance string includes that the second divider resistance and second trim resistance string, and described second, which trims resistance string, includes at least one
A second trims resistance；
Each described first, which trims resistance and each described second, trims resistance with corresponding metal fuse parallel connection, passes through
The on-off for trimming the metal fuse obtains the precision of different input turnover voltages.
According to the utility model of above scheme, which is characterized in that electric current trim or laser trimming by way of realize
The metal fuse trims.
According to the utility model of above scheme, which is characterized in that trimmed in resistance string described first, described first repairs
Adjust resistive linearity increasing or decreasing.
According to the utility model of above scheme, which is characterized in that trimmed in resistance string described second, described second repairs
Adjust resistive linearity increasing or decreasing.
According to the utility model of above scheme, which is characterized in that trimmed in resistance string described first, described first repairs
Resistance is adjusted to carry out increasing or decreasing according to power number formulary.
Further, described first resistance is trimmed according to 2 power number formulary progress increasing or decreasing.
According to the utility model of above scheme, which is characterized in that trimmed in resistance string described second, described second repairs
Resistance is adjusted to carry out increasing or decreasing according to power number formulary.
Further, described second resistance is trimmed according to 2 power number formulary progress increasing or decreasing.
According to the utility model of above scheme, which is characterized in that when trimming, minimum trims stepping are as follows: described first repairs
It adjusts resistance string or described second trims the non-zero minimum resistance resistance value of resistance string relative to the first divider resistance and the second partial pressure electricity
The percentage of the resistance value sum of resistance.
According to the utility model of above scheme, which is characterized in that when trimming, maximum trims range are as follows: described first repairs
Adjust the sum of all resistances of resistance string relative to the percentage of the resistance value sum of the first divider resistance string and the second divider resistance；
Or maximum trims range are as follows: described second trims the sum of all resistances of resistance string relative to the first divider resistance and
The percentage of the resistance value sum of two divider resistance strings.
According to the utility model of above scheme, the beneficial effect is that, the utility model can match resistor random-access
Error/amplifier input random fit error/reference source voltage random error is trimmed, and the electricity of required absolute precision is obtained
Comparator is pressed, and overriding precision is high；Meanwhile the utility model can carry out positive negative direction and trim, entirely trim it is easy to operate,
It saves and trims required time and process costs；The utility model can extend to arbitrary accuracy and trim the high-precision of bit number
Voltage comparator design, can be applied in the IC design of the every field including power management chip field, has
Broad applicability.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the utility model.
Fig. 2 is the circuit diagram of embodiment one in the utility model.
Fig. 3 is the circuit diagram of embodiment two in the utility model.
Specific embodiment
With reference to the accompanying drawing and the utility model is further described in embodiment:
As shown in Figure 1, a kind of realization circuit of high-precision absolute voltage comparator, including comparator A, input voltage signal
An input terminal (being inverting input terminal in this implementation) of Vin and reference voltage Vref, comparator A connect with reference voltage Vref
It connects.
Another input terminal (non-inverting input terminal i.e. in the present embodiment) of comparator A concatenates ground by the first divider resistance,
First divider resistance string includes that the first divider resistance R1 and first trims resistance string, first trim resistance string include at least one the
One trims resistance R1i；The input terminal of comparator A also passes through the second divider resistance string and connect with input voltage signal Vin, and second
Divider resistance string includes that the second divider resistance R2 and second trims resistance string, and second to trim resistance string include that at least one second is repaired
Adjust resistance R2j.According to specific needs, the resistance value of the first divider resistance and the second divider resistance can be identical or different；First
It trims resistance R1i and second to trim in resistance R2j, i, j are the natural number between 1-n.
Each first trims resistance and each second to trim resistance in parallel with corresponding metal fuse, by trimming metal
The on-off of fuse obtains the precision of different input turnover voltages.Preferably, electric current trim or laser trimming by way of realize
Metal fuse trims, and trims that process is more convenient, reduces the time cost and process costs trimmed.
Since in specific design, the bias direction of technique is different, therefore difference according to the specific application occasions, and first repairs
The first number for trimming resistance and the resistance value regularity of distribution, second is adjusted in resistance string to trim in resistance string the second number for trimming resistance
And the resistance value regularity of distribution, the numerical relation of the first divider resistance and the second divider resistance, the first divider resistance and first trim electricity
The relationship that the relationship and the second divider resistance for hindering string trim resistance string with second can be adaptively adjusted, and not limit herein
It is fixed, appropriate adjustment is carried out according to specific application example.
It is trimmed in resistance string first, first, which trims resistance, carries out increasing or decreasing (preferably 2 power according to power number formulary
Secondary number formulary is distributed)；Trimmed in resistance string second, second trim resistance according to power number formulary carry out increasing or decreasing it is (excellent
It is selected as 2 power number formulary to be distributed).Power number formulary carries out circuit design, can obtain it is small in the case where trimming step-length, most
The reduction of limits trims required fuse quantity, has and reaches the minimum applicability for trimming cost and process costs.
When trimming, minimum trims stepping are as follows: first trims the non-zero minimum resistance resistance value of resistance string relative to the first partial pressure
The percentage of the resistance value sum of resistance and the second divider resistance, i.e.,Wherein R11 is trimmed in resistance string most for all first
Small resistance；Or minimum trims stepping are as follows: second trims the non-zero minimum resistance resistance value of resistance string relative to the first partial pressure
The percentage of the resistance value sum of resistance and the second divider resistance, i.e.,Wherein R21 is trimmed in resistance string most for all second
Small resistance.
When trimming, maximum trims range are as follows: first trims the sum of all resistances of resistance string relative to divider resistance
The percentage of the resistance value sum of string and the second divider resistance, i.e.,Or maximum trims range are as follows: second trims
Percentage of the sum of all resistances of resistance string relative to the resistance value sum of the first divider resistance and the second divider resistance string, i.e.,
Embodiment one
As shown in Fig. 2, trimming resistance R11 including the first divider resistance R1, first in the first divider resistance string, first is trimmed
Resistance R11 is in parallel with metal fuse Fuse1；Resistance is trimmed including the second divider resistance R2, second in second divider resistance string
R21, second to trim resistance R21 in parallel with metal fuse Fuse2.
It needs design accuracy for 10mV in the present embodiment, detect the voltage comparator of voltage Vin=2.4V, i.e. non-defective unit value
For 2.390V~2.410V.Theoretical Design value is Vref=1.200V, R1=R2=100k ohm, R11=R21=2k ohm；
The gain of amplifier A is 80dB, can not consider error caused by the finite gain of A；Metal fuse Fuse1 and metal fuse
The resistance of Fuse2 is 100m ohm or so, can be approximated to be short circuit.
It in middle survey, is monitored by board, it is assumed that the temporal resolution of board is 1mV/1ms, controls the rising of Vin
Slope (temporal resolution) is 2mV/1ms；Scanning is terminated to 2.8V since 2.0V, can be 2mV's with precision in 400ms
It is required that obtaining the exact value of Vin.
(1) if reference voltage Vref produces the deviation of 12mV, i.e. Vref=1.212V, the first divider resistance R1 and second
Divider resistance R2 is constant, and the equivalent inpnt offet of amplifier A is 0.In the case where not trimming, input voltage signal Vin's
Turnover voltage is Vin=Vref × (R1+R2)/R1=1.212 × 2=2.424V, and is detected by board, this test value is
Have exceeded the 10mV precision of requirement.
When trimming, by metal fuse Fuse1 fuse opening, at this moment the turnover voltage of input voltage signal Vin is Vin1
=Vref × (R1+R11+R2)/(R1+R11)=1.212 × (202/102)=2.400V, then while reference voltage Vref
Random error causes the reversal voltage of comparator in 1.212V, deviates design value 12mV, after trimming, still is able to be returned to and sets
Evaluation 2.4V.
(2) if the deviation value of reference voltage Vref is smaller, such as Vref=1.208V, then test value will become
1.208 × 2=2.416V has exceeded error range 10mV, it is still desirable to be trimmed.
Trim rear Vin1 become Vin1=Vref × (R1+R11+R2)/(R1+R11)=1.208 × (202/102)=
2.392V becomes -8mV error compared to+16mV error before, becomes non-defective unit from defective products.
(3) if reference voltage Vref produces the deviation of -12mV, i.e. Vref=1.188V, the first divider resistance R1 and
Second divider resistance R2 is constant, and the equivalent inpnt offet of amplifier A is 0.In the case where not trimming, input voltage signal
The turnover voltage of Vin is Vin=Vref × (R1+R2)/R1=1.188 × 2=2.376V, and is detected by board, this
Test value has had exceeded the ± 10mV precision of requirement.
At this point, metal fuse Fuse2 is blown, at this moment the turnover voltage of input voltage signal Vin is Vin1=Vref × (R1
+ R2+R21)/(R1)=1.188 × (202/100)=2.399V, become non-defective unit.
(4) if reference voltage Vref=1.2V, the first divider resistance R1 and the second divider resistance R2 is constant, amplifier A
Equivalent inpnt offet be 12mV；Or reference voltage Vref and amplifier A produces deviation simultaneously, and is all 6mV, etc.
The input for imitating Vref or amplifier A generates 12mV deviation.Above situation can be equivalent in above-mentioned (1) and trim mode.
What the utility model circuit structure may be implemented positive and negative two-way error trims control；And benchmark electricity can be extended to
Press the random deviation of Vref, amplifier A and resistance string (the first divider resistance R1 and the second divider resistance R2) same equivalent to single
One error, i.e. the utility model circuit have broad applicability.
Embodiment two
As shown in figure 3, resistance R11, R12, R13 are trimmed including the first divider resistance R1, first in the first divider resistance string,
It is in parallel with metal fuse Fuse11 to trim resistance R11, it is in parallel with metal fuse Fuse12 to trim resistance R12, trim resistance R13 with
Metal fuse Fuse13 is in parallel；In second divider resistance string include the second divider resistance R2, second trim resistance R21, R22,
R23, it is in parallel with metal fuse Fuse21 to trim resistance R21, and it is in parallel with metal fuse Fuse22 to trim resistance R22, trims resistance
R23 is in parallel with metal fuse Fuse23.
In the present embodiment, R1=R2=35R, R11=R21=1R, R12=R22=2R, R13=R23=4R.
Minimum trims minimum resistance resistance value that stepping is shorted by metal fuse relative to the first divider resistance and second point
The percentage of the resistance value sum of piezoresistance, maximum trim the sum of all resistances that range is shorted by metal fuse relative to the
One trims the percentage of the resistance value sum of resistance string and the second divider resistance.
In the present embodiment, can do the minimum step trimmed is 1R/ (35R+35R) ≈ 1.4%, and the maximum magnitude trimmed is
(1R+2R+4R)/(35R+35R+1R+2R+4R) ≈ 9%.Assuming that Vref=1.2V, then minimum step is 1.4% × 1.2 ≈
17mV, maximum overriding range are 9% × 1.2 ≈ 108mV, and 17mV trim can be used positive and negative both direction (i.e. ±
17mV), 108mV can be adapted for the range (i.e. ± 108mV) of positive and negative both direction.
The corresponding resistance of overriding metal fuse is distributed by 2 power side, then can be achieved to repair using least
Metal fuse is adjusted, realization is maximum to trim range.It is carried out arbitrarily in the range of ± 108mV according to the stepping of 17mV in this implementation
Value trims, and obtained table is as follows, wherein 0 is indicated with 1 to blow for default connection.
| Fuse1 | Fuse2 | Fuse3 | Fuse4 | Fuse5 | Fuse6 | Correspondence trims voltage |
| 0 | 0 | 0 | 1 | 1 | 1 | 108mV |
| 0 | 0 | 0 | 0 | 1 | 1 | 92mV |
| 0 | 0 | 0 | 1 | 0 | 1 | 77mV |
| 0 | 0 | 0 | 0 | 0 | 1 | 62mV |
| 0 | 0 | 0 | 1 | 1 | 0 | 46mV |
| 0 | 0 | 0 | 0 | 1 | 0 | 31mV |
| 0 | 0 | 0 | 1 | 0 | 0 | 16mV |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 0 | 0 | 0 | -16mV |
| 0 | 1 | 0 | 0 | 0 | 0 | -31mV |
| 0 | 1 | 1 | 0 | 0 | 0 | -46mV |
| 1 | 0 | 0 | 0 | 0 | 0 | -62mV |
| 1 | 0 | 1 | 0 | 0 | 0 | -77mV |
| 1 | 1 | 0 | 0 | 0 | 0 | -92mV |
| 1 | 1 | 1 | 0 | 0 | 0 | -108mV |
It is to trim minimum resistance resistance value that metal fuse fuse is shorted relative to whole string electricity since precision step-length is corresponding
The percentage of the resistance value of resistance.Therefore analogized with above-described embodiment, as long as the minimum resistance resistance value that metal fuse fuse is shorted is opposite
It is sufficiently small, the available very high result of the precision that can be trimmed.
In other embodiments, the corresponding resistance of overriding metal fuse can also linear increasing or decreasing, such as
Several 1R series connection forms the different resistance values such as 1R, 2R, 3R, 4R according to the different modes that trim, and then realizes and different trim essence
Degree and range.
The utility model by connect between two divider resistances it is corresponding trim resistance, and each trim resistance
Corresponding metal fuse in parallel respectively, is trimmed by electric current or laser trimming technical controlling metal fuse is cut-off, and then is realized
Different high-precision voltage comparators；Meanwhile single resistors match error/amplifier is inputted random fit by the utility model
Error/reference source voltage random error is integrated, and the popularity of application is realized.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.
Illustrative description is carried out to the utility model patent above in conjunction with attached drawing, it is clear that the reality of the utility model patent
It is now not subject to the restrictions described above, as long as being carried out using the method concept and technical solution of the utility model patent various
Improve, or it is not improved the conception and technical scheme of the utility model patent are directly applied into other occasions, in this reality
With in novel protection scope.
Claims (10)
1. a kind of realization circuit of high-precision absolute voltage comparator, including comparator, input voltage signal and reference voltage, institute
An input terminal for stating comparator is connect with the reference voltage, which is characterized in that
Another input terminal of the comparator includes first point by the first divider resistance concatenation ground, the first divider resistance string
Piezoresistance and first trims resistance string, and described first to trim resistance string include that at least one first trims resistance；
Another input terminal of the comparator also passes through the second divider resistance string and connect with the input voltage signal, and described
Two divider resistance strings include that the second divider resistance and second trim resistance string, described second trim resistance string include at least one the
Two trim resistance；
Each described first trims resistance and each described second to trim resistance in parallel with corresponding metal fuse.
2. the realization circuit of high-precision absolute voltage comparator according to claim 1, which is characterized in that repaired by electric current
It adjusts or the mode of laser trimming realizes trimming for the metal fuse.
3. the realization circuit of high-precision absolute voltage comparator according to claim 1, which is characterized in that described first
It trims in resistance string, described first trims resistive linearity increasing or decreasing.
4. the realization circuit of high-precision absolute voltage comparator according to claim 1, which is characterized in that described second
It trims in resistance string, described second trims resistive linearity increasing or decreasing.
5. the realization circuit of high-precision absolute voltage comparator according to claim 1, which is characterized in that described first
It trims in resistance string, described first, which trims resistance, carries out increasing or decreasing according to power number formulary.
6. the realization circuit of high-precision absolute voltage comparator according to claim 5, which is characterized in that described first repairs
Resistance is adjusted to carry out increasing or decreasing according to 2 power number formulary.
7. the realization circuit of high-precision absolute voltage comparator according to claim 1, which is characterized in that described second
It trims in resistance string, described second, which trims resistance, carries out increasing or decreasing according to power number formulary.
8. the realization circuit of high-precision absolute voltage comparator according to claim 7, which is characterized in that described second repairs
Resistance is adjusted to carry out increasing or decreasing according to 2 power number formulary.
9. the realization circuit of high-precision absolute voltage comparator according to claim 1, which is characterized in that when trimming, most
Light maintenance pacing into are as follows: described first trims resistance string or described second trims the non-zero minimum resistance resistance value of resistance string relative to
The percentage of the resistance value sum of one divider resistance and the second divider resistance.
10. the realization circuit of high-precision absolute voltage comparator according to claim 1, which is characterized in that when trimming, most
Range is trimmed greatly are as follows: described first trims the sum of all resistances of resistance string relative to the first divider resistance string and second point
The percentage of the resistance value sum of piezoresistance；Or maximum trims range are as follows: described second trim resistance string all resistances it
With the percentage of the resistance value sum relative to the first divider resistance and the second divider resistance string.
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| CN201920489655.8U CN209731200U (en) | 2019-04-09 | 2019-04-09 | A kind of realization circuit of high-precision absolute voltage comparator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861674A (en) * | 2019-04-09 | 2019-06-07 | 深圳市万微微电子技术有限公司 | A kind of realization circuit of high-precision absolute voltage comparator |
| CN113051629A (en) * | 2021-03-10 | 2021-06-29 | 湖北大学 | On-off PUF based on-chip fuse |
-
2019
- 2019-04-09 CN CN201920489655.8U patent/CN209731200U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861674A (en) * | 2019-04-09 | 2019-06-07 | 深圳市万微微电子技术有限公司 | A kind of realization circuit of high-precision absolute voltage comparator |
| CN113051629A (en) * | 2021-03-10 | 2021-06-29 | 湖北大学 | On-off PUF based on-chip fuse |
| CN113051629B (en) * | 2021-03-10 | 2022-06-17 | 湖北大学 | Integrated circuit for realizing on-off PUF (physical unclonable function) based on-chip fuse |
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Address after: 518000 Baolong Community, Baolong Street, Longgang District, Shenzhen City, Guangdong Province Patentee after: Shenzhen wanwei Semiconductor Co., Ltd Address before: 518000 Baolong Community, Baolong Street, Longgang District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN WANWEI MICROELECTRONICS TECHNOLOGY Co.,Ltd. |