CN101257306B - Method for enhancing repair melody yield of 12 bit double R-2R structure D/A converter two polar zero point - Google Patents
Method for enhancing repair melody yield of 12 bit double R-2R structure D/A converter two polar zero point Download PDFInfo
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- CN101257306B CN101257306B CN2008100695344A CN200810069534A CN101257306B CN 101257306 B CN101257306 B CN 101257306B CN 2008100695344 A CN2008100695344 A CN 2008100695344A CN 200810069534 A CN200810069534 A CN 200810069534A CN 101257306 B CN101257306 B CN 101257306B
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Abstract
The invention discloses a method for enhancing the dual-polar null point toning finished rate of D/A converter with 12-bit dual-R-2R structure, wherein a resistance R1 is in series connected between a R-2R resistance network RNET and a negative reference power supply Vref. The D/A converter with 12-bit dual-R-2R structure can satisfy the need of dual-polar null point toning only by toning two resistances with finished rate is more than 90,which is acceptable for the D/A converter with 10-12-bit dual-R-2R resistance network structure.
Description
(1) technical field
The present invention relates to a kind of method that 12 two R-2R structure D/A converter polar zero points are repaiied the accent rate of finished products that improves, its direct applied field is the D/A converter field, 10-12 position of two R-2R structures.
(2) background technology
Two R-2R structure D/A converters are D/A converter structures of the present 10-12 precision of using always, adopt pair basic block diagram of the D/A converter that 12 bipolar voltages of R-2R resistor network structures realization are exported as shown in Figure 1.The advantage of this structure is to have utilized two groups of R-2R resistor networks, and the error that makes D/A converter is decided by the arithmetic mean of the error of two groups of resistor networks, and this has just reduced circuit to the demanding requirement of technological parameter, has improved the precision of D/A converter.
The operation principle of 12 D/A converters of this pair R-2R structure: in Fig. 1, when the input of switch D12～D1 is " 1 " entirely, output current i
n=V
REF/ R, when switch D12-D1 input is " 0 " entirely, output current i
n=-V
REF/ R, output current is by operational amplifier A and feedback resistance R
F(resistance equals R) produces output voltage V respectively
OUT=-V
REFAnd V
OUT=+V
REF, wherein+V
REFWith-V
REFBe respectively positive and negative benchmark input, under other digital input values, also can produce corresponding output.
The shortcoming of this structure is the resistance quantity more (12) that need repair accent when repairing accent polar zero point error, repaiies and transfers rate of finished products low.
(3) summary of the invention
The polar zero point that the objective of the invention is to reduce 12 two R-2R structure D/A converters is repaiied and is transferred resistance quantity, and that improves polar zero point repaiies the accent rate of finished products.
The present invention is characterized in that for the technical scheme that solves this technical problem is a kind of method that 12 two R-2R structure D/A converter polar zero points are repaiied the accent rate of finished products that improves of the present invention:
As shown in Figure 3, at R-2R resistor network RNET+ and positive reference power supply+V
REFBetween the serial connection resistance R 1, at R-2R resistor network RNET-and negative reference power supply-V
REFBetween the serial connection resistance R 2; One end of resistance R 1 and positive reference power supply+V
REFLink to each other, its other end links to each other with first order resistance R and the 2R of R-2R resistor network RNET+, an end of resistance R 2 and negative reference power supply-V
REFLink to each other, its other end links to each other with R-2R resistor network RNET-first order resistance R and 2R, and the described step that 12 two R-2R structure D/A converter polar zero points are repaiied accent is as follows:
1) repaiies the differential error of transferring two R-2R structure D/A converters;
2) the positive and negative full scale output voltage values under test complete " 0 " input and complete " 1 " initial conditions is made as V
F-And V
F+
3) judge V
F-And V
F+The size of absolute value, if | V
F-|＞| V
F+|, then repair and transfer resistance R 1, until | V
F-|=| V
F+|; If | V
F-|＜| V
F+|, then repair and transfer resistance R 2, until | V
F-|=| V
F+|.
Described resistance R 1, R2 are the CrSi metallic resistance of resistance 0.8～1k Ω.
Beneficial effect:
Polar zero point method for repairing and regulating of the present invention and general polar zero point method for repairing and regulating all pass through the actual flow checking of CrSi-CMOS technology.
Adopt general polar zero point method for repairing and regulating shown in Figure 1, to repair 12 resistance transferring in the resistor network R-2R resistor network in proportion, could on the basis that does not influence differential error, repair the accent polar zero point, guarantee higher differential error then in the resistor network relative accuracy of resistance have relatively high expectations, transfer precision to be not easy control so repair, repair and transfer rate of finished products low, generally about 20%.
Adopt polar zero point method for repairing and regulating of the present invention, only need repair and transfer two resistance, polar zero point is met the demands, owing to need repair the resistance of accent outside the R-2R resistor network, do not influence the ratio of the resistance in the resistor network, so to the not influence of differential error of D/A converter, it is repaiied and transfers rate of finished products to reach more than 90%.
(4) description of drawings
Fig. 1 is the circuit structure diagram of general 12 two R-2R structure D/A converters;
Fig. 2 is the equivalent schematic that the polar zero point of two R-2R structure D/A converters is repaiied accent;
Fig. 3 is the circuit structure diagram of 12 two R-2R structure D/A converters of the inventive method.
(5) embodiment
Summary of the invention in the specification of the present invention is exactly a specific embodiment, here repeated description no longer.Only further specify its operation principle below in conjunction with the accompanying drawings.
Shown in circuit structure Fig. 1 of 12 general two R-2R structure D/A converters.Among Fig. 1, be virtual earth because the negative feedback of amplifier A makes its reverse input end, respectively with positive reference power supply+V
REFWith negative reference power supply-V
REFTwo groups of R-2R resistor networks that link to each other can be regarded as independently, and the resistance in one of them R-2R resistor network can not produce any influence to the resistance in another.The output current that two R-2R resistor networks flow to the amplifier backward end satisfies linear superposition theorem, at amplifier feedback resistance R
FOn the electric current that flows through be:
When D12～D1 is " 100000000000 ", because |+V
REF|=|-V
REF|, the output voltage V of D/A converter
OUTTheoretical value be 0V, and the actual because influence of technology relative accuracy and can't reach theoretical value is so must reach by laser trimming (by laser cutting resistance, increasing resistance).Repair transfer polar zero point equivalent circuit diagram as shown in Figure 2.Among Fig. 2, R
DAC+And R
DAC-Be to be connected to positive reference power supply+V
REFWith negative reference power supply-V
REFThe equivalent resistance of R-2R resistor network.Generally, R
DAC+≠ R
DAC-, then need to repair accent by laser resistance, two equivalent resistances are repaiied furnishing equate.
Equivalent resistance is made up of resistor network, and the resistance in the resistor network is that requirement is proportional fully, because its proportional precision directly determines the differential error of D/A converter.Repair when transferring polar zero point, in order not influence the differential error of D/A converter, must repair accent in proportion to each resistance in one of them R-2R resistor network, the equivalent resistance that whole resistor network is repaiied behind the accent equates with the resistance of the equivalent resistance of another resistor network.It is as follows suddenly specifically to repair pacing:
1) repaiies the differential error of transferring two R-2R structure D/A converters.
2) the positive and negative full scale output voltage values under test complete " 0 " input and complete " 1 " initial conditions is made as V
F-And V
F+
3) judge V
F-And V
F+The size of absolute value.If | V
F-|＞| V
F+|, then repair in proportion and change the line map in 1 and positive reference power supply+V
REFAll resistances in the R-2R resistor network that connects are that the resistance of 2R (is promptly repaiied and transferred equivalent resistance R
DAC+), until | V
F-|=| V
F+|; If | V
F-|＜| V
F+|, then repair in proportion and change the line map in 1 and negative reference power supply-V
REFAll resistances in the R-2R resistor network that connects are that the resistance of 2R (is promptly repaiied and transferred equivalent resistance R
DAC-), until | V
F-|=| V
F+|.
To repair pacing rapid according to above-mentioned, to the D/A converter of 12 two R-2R structures of a routine, finishes polar zero point and repair accent and need repair and transfer 12 resistance.
The circuit structure diagram of 12 two R-2R structure D/A converters of the present invention as shown in Figure 3.At R-2R resistor network RNET+ and positive reference power supply+V
REFBetween the serial connection resistance R 1, at R-2R resistor network RNET-and negative reference power supply-V
REFBetween the serial connection resistance R 2.
Because resistance R 1 and R2 are serially connected between reference power supply and the R-2R resistor network, repair and transfer these two resistance and repair the R that changes the line map in 2
DAC+And R
DAC-Play effect same, therefore can reach and realize repairing the purpose of transferring 12 two R-2R structure D/A converter polar zero points.Simultaneously, because resistance R 1 and R2 are positioned at outside the R-2R resistor network, repair timing, the resistance that changes these two resistance can not influence the ratio of resistance in the R-2R resistor network, thereby can not influence the differential error of D/A converter.Adopt the inventive method to repair pacing as follows suddenly:
1) repaiies the differential error of transferring two R-2R structure D/A converters.
2) the positive and negative full scale output voltage values under test complete " 0 " input and complete " 1 " initial conditions is made as V
F-And V
F+
3) judge V
F-And V
F+The size of absolute value.If | V
F-|＞| V
F+|, then repair the R1 that changes the line map in 3, until | V
F-|=| V
F+|; If | V
F-|＜| V
F+|, then repair the R2 that changes the line map in 3 until | V
F-|=| V
F+|.
To repair pacing rapid according to above-mentioned, to a D/A converter that adopts 12 two R-2R structures of structure of the present invention, finishes polar zero point and repair accent and only need to repair and transfer 2 resistance.
Described resistance R 1, R2 are the CrSi metallic resistance of resistance 0.8～1k Ω.
12 two R-2R structure D/A converters of the present invention adopt the manufacturing of custom integrated circuit technology.
Claims (2)
1. one kind is improved the method that 12 two R-2R structure D/A converter polar zero points are repaiied the accent rate of finished products, it is characterized in that: at R-2R resistor network RNET+ and positive reference power supply+V
REFBetween the serial connection resistance R 1, at R-2R resistor network RNET-and negative reference power supply-V
REFBetween the serial connection resistance R 2; One end of resistance R 1 and positive reference power supply+V
REFLink to each other, its other end links to each other with first order resistance R and the 2R of R-2R resistor network RNET+, an end of resistance R 2 and negative reference power supply-V
REFLink to each other, its other end links to each other with first order resistance R and the 2R of R-2R resistor network RNET-, and the described step that 12 two R-2R structure D/A converter polar zero points are repaiied accent is as follows:
1) repaiies the differential error of transferring two R-2R structure D/A converters;
2) the positive and negative full scale output voltage values under test complete " 0 " input and complete " 1 " initial conditions is made as V
F-And V
F+
3) judge V
F-And V
F+The size of absolute value, if | V
F-|＞| V
F+|, then repair and transfer resistance R 1, until | V
F-|=| V
F+|; If | V
F-|＜| V
F+|, then repair and transfer resistance R 2, until | V
F-|=| V
F+|.
2. a kind of method that 12 two R-2R structure D/A converter polar zero points are repaiied the accent rate of finished products that improves according to claim 1, it is characterized in that: described resistance R 1, R2 are the CrSi metallic resistance of resistance 0.8～1k Ω.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100695344A CN101257306B (en) | 2008-04-02 | 2008-04-02 | Method for enhancing repair melody yield of 12 bit double R-2R structure D/A converter two polar zero point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100695344A CN101257306B (en) | 2008-04-02 | 2008-04-02 | Method for enhancing repair melody yield of 12 bit double R-2R structure D/A converter two polar zero point |
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| Publication Number | Publication Date |
|---|---|
| CN101257306A CN101257306A (en) | 2008-09-03 |
| CN101257306B true CN101257306B (en) | 2010-10-06 |
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|---|---|---|---|
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| US8803722B2 (en) * | 2012-06-19 | 2014-08-12 | International Business Machines Corporation | Resistor-2 resistor (R-2R) digital-to-analog converter with partial resistor network reconfiguration |
| CN111342786B (en) | 2020-04-21 | 2021-09-21 | 上海类比半导体技术有限公司 | Differential amplifier common mode rejection ratio and gain trimming circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1561001A (en) * | 2004-03-11 | 2005-01-05 | 中国电子科技集团公司第二十四研究所 | 12-bit A/D converter of fold insertion structure |
| CN101136635A (en) * | 2007-09-04 | 2008-03-05 | 中国电子科技集团公司第二十四研究所 | Method for reducing inverse R-2R structure D/A converter output current overshoot |
-
2008
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1561001A (en) * | 2004-03-11 | 2005-01-05 | 中国电子科技集团公司第二十四研究所 | 12-bit A/D converter of fold insertion structure |
| CN101136635A (en) * | 2007-09-04 | 2008-03-05 | 中国电子科技集团公司第二十四研究所 | Method for reducing inverse R-2R structure D/A converter output current overshoot |
Non-Patent Citations (7)
| Title |
|---|
| CN 1561001 A,全文. |
| 应建华等.电压型R-2R梯形网络DAC线性误差分析方法.微电子学36 3.2006,36(3),257-260. |
| 应建华等.电压型R-2R梯形网络DAC线性误差分析方法.微电子学36 3.2006,36(3),257-260. * |
| 张俊安等.一种带双极性基准的双R-2R电阻网络结构.微电子学37 3.2007,37(3),345-348. |
| 张俊安等.一种带双极性基准的双R-2R电阻网络结构.微电子学37 3.2007,37(3),345-348. * |
| 杨卫东等.一种12位D/A转换器的技术研究.微电子学38 1.2008,38(1),64-67. |
| 杨卫东等.一种12位D/A转换器的技术研究.微电子学38 1.2008,38(1),64-67. * |
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| CN101257306A (en) | 2008-09-03 |
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Owner name: CHONGQING DRAWWAY ELECTRONIC TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: NO.24 INST., CHINA ELECTRONIC SCIENCE + TECHNOLOGY GROUP CORP. Effective date: 20110221 |
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