CN101136635A - Method for reducing inverse R-2R structure D/A converter output current overshoot - Google Patents
Method for reducing inverse R-2R structure D/A converter output current overshoot Download PDFInfo
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- CN101136635A CN101136635A CNA200710092665XA CN200710092665A CN101136635A CN 101136635 A CN101136635 A CN 101136635A CN A200710092665X A CNA200710092665X A CN A200710092665XA CN 200710092665 A CN200710092665 A CN 200710092665A CN 101136635 A CN101136635 A CN 101136635A
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Abstract
This invention discloses a method for reducing overshoot of output current of an A/D converter in inverse R-2R structure, which connects resistor R4 and PNP triode Q2 in series between diode current switch D1 and constant source offset triode Q1 and the D/A converter of an inverse R-2R structure can eliminate overshoot and increases the set-up time from 200ns of an ordinary structure to 25ns.
Description
(1) technical field
The present invention relates to a kind of method of the reduction structure of falling R-2R D/A converter output current overshoot, its direct applied field is high speed, high-precision d/a converter field.
(2) background technology
The structure of falling R-2R D/A converter is high speed, a high-precision d/a converter structure commonly used at present, and its basic block diagram as shown in Figure 1.The advantage of this structure is to determine the high resistance measurement of precision to separate with the low resistance resistance that determines settling time, to realize higher precision and speed.
If only adopt the simple diode current switch in the structure of the falling R-2R D/A converter basic structure shown in Figure 1, in the electric current of this kind D/A converter output waveform settling time big overshoot can appear, as shown in Figure 2.When overshoot is serious, with the electric current output settling time of the whole D/A converter of influence.It produces reason: when input signal is low level, diode current switch D1 flows through a large amount of electric currents, after input signal sports high level, diode D1 oppositely ends, storage inside a large amount of electric charges simultaneously, at this time diode equivalent is an electric capacity, if the speed that electric charge discharges is less than the speed of input sudden change, then can produce the bootstrapping effect of similar charge pump, increased, small resistor R1, the R2 of electric charge by big resistance R 3 and the resistor network of the falling R-2R release of discharging emitter voltage moment of triode Q1.Because the resistance of R1, R2 path is less, current potential is lower, electric charge discharges main through this path, thus moment increased the output current of D/A converter, cause the output of D/A converter electric current to be set up in the waveform and very big overshoot can occur.
(3) summary of the invention
The objective of the invention is to eliminate the big overshoot of the output current that the general structure of falling R-2R D/A converter brings owing to its simple diode current switch, the settling time of improving whole D/A converter.
The present invention is characterized in that for the technical scheme that solves this technical problem is that the present invention has adopted a kind of method of the reduction structure of falling R-2R D/A converter output current overshoot:
A resistance R 4 and a PNP triode Q2 between its diode current switch D1 and constant-current source bias triode Q1, have been connected in series with the electric charge of releasing; One end of resistance R 4 extremely links to each other with the N of diode D1, and its other end links to each other with the emitter of triode Q2, the grounded collector of triode Q2, and the base stage of triode Q2 links to each other with the base stage of constant-current source bias triode Q1.
Described resistance R 4 is the NiCrSi metallic resistance of resistance 2.5～5k Ω, and described triode Q2 adopts the TPQ3906 triode.
Beneficial effect:
In the structure of falling R-2R D/A converter structure, at adopting simple diode current switch can bring the big overshoot of output current, the present invention has designed one when the data input becomes high level, the path of extra bleed off is provided for electric charge, solved the output of D/A converter electric current well and set up the problem of the overshoot that the meeting appearance is very big in the waveform, thereby made D/A converter reach best settling time.
Adopt method of the present invention, under identical condition, the structure of falling R-2R D/A converter has not only been eliminated overshoot, and will settling time brings up to about 25ns from the 200ns of general structure.
The structure of the falling R-2R D/A converter of employing the inventive method and the actual test effect contrast figure of the general structure of falling R-2R D/A converter waveform settling time are as shown in Figure 4.
(4) description of drawings
Fig. 1 is the basic block diagram of the structure of falling R-2R D/A converter;
Fig. 2 is the structure chart that adopts the simple diode current switch;
Fig. 3 is the structure chart that the structure of falling R-2R D/A converter adopts current switch of the present invention;
Fig. 4 adopts the structure of falling R-2R D/A converter of the inventive method and the general structure of falling R-2R D/A to change
The actual test effect contrast figure of parallel operation waveform settling time.
(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.
The basic block diagram of the structure of falling R-2R D/A converter of the present invention as shown in Figure 3.A resistance R 4 and a PNP triode Q2 between diode current switch D1 and constant-current source bias triode Q1, have been connected in series; One end of resistance R 3 links to each other with supply voltage Vh, and its other end extremely links to each other with the emitter of triode Q1 and the P of diode D1 respectively, and the base stage of triode Q1 links to each other with bias voltage Vb.
When the data input sports high level, the negative pole of diode current switch D1 (the N utmost point) is gone up charge stored by resistance R 4 and PNP triode Q2, discharge rapidly over the ground, by regulating resistance R 4, can regulate the speed that electric charge discharges, make data input sudden change big fluctuation just in time not occur, thereby reach best settling time the emitter voltage influence of constant-current source bias triode Q1.
Described resistance R 4 is the NiCrSi metallic resistance of resistance 2.5～5k Ω, and described triode Q2 is the PNP triode, and model is TPQ3906.
The structure of falling R-2R D/A converter of the present invention adopts the manufacturing of conventional hybrid integrated circuit technology.
Claims (2)
1. a method that reduces the structure of falling R-2R D/A converter output current overshoot is characterized in that: be connected in series a resistance R 4 and a PNP triode Q2 with the electric charge of releasing between its diode current switch D1 and constant-current source bias triode Q1; One end of resistance R 4 extremely links to each other with the N of diode D1, and its other end links to each other with the emitter of triode Q2, the grounded collector of triode Q2, and the base stage of triode Q2 links to each other with the base stage of constant-current source bias triode Q1.
2. the method for a kind of reduction structure of falling R-2R D/A converter output current overshoot according to claim 1 is characterized in that: described resistance R 4 is the NiCrSi metallic resistance of resistance 2.5～5k Ω, and described triode Q2 adopts the TPQ3906 triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710092665XA CN101136635B (en) | 2007-09-04 | 2007-09-04 | Method for reducing inverse R-2R structure D/A converter output current overshoot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710092665XA CN101136635B (en) | 2007-09-04 | 2007-09-04 | Method for reducing inverse R-2R structure D/A converter output current overshoot |
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| CN101136635A true CN101136635A (en) | 2008-03-05 |
| CN101136635B CN101136635B (en) | 2011-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200710092665XA Expired - Fee Related CN101136635B (en) | 2007-09-04 | 2007-09-04 | Method for reducing inverse R-2R structure D/A converter output current overshoot |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257306B (en) * | 2008-04-02 | 2010-10-06 | 中国电子科技集团公司第二十四研究所 | Method for enhancing repair melody yield of 12 bit double R-2R structure D/A converter two polar zero point |
| CN103166645A (en) * | 2011-12-14 | 2013-06-19 | 上海华虹Nec电子有限公司 | R-2R type digital analog converter circuit |
| CN110140297A (en) * | 2017-01-04 | 2019-08-16 | Arm有限公司 | Use the analog-digital converter of associated electrical material devices |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3246498B2 (en) * | 1999-11-30 | 2002-01-15 | ヤマハ株式会社 | Digital / analog converter |
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2007
- 2007-09-04 CN CN200710092665XA patent/CN101136635B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257306B (en) * | 2008-04-02 | 2010-10-06 | 中国电子科技集团公司第二十四研究所 | Method for enhancing repair melody yield of 12 bit double R-2R structure D/A converter two polar zero point |
| CN103166645A (en) * | 2011-12-14 | 2013-06-19 | 上海华虹Nec电子有限公司 | R-2R type digital analog converter circuit |
| CN103166645B (en) * | 2011-12-14 | 2016-02-10 | 上海华虹宏力半导体制造有限公司 | A kind of R-2R type d convertor circuit |
| CN110140297A (en) * | 2017-01-04 | 2019-08-16 | Arm有限公司 | Use the analog-digital converter of associated electrical material devices |
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| Publication number | Publication date |
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| CN101136635B (en) | 2011-01-12 |
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Granted publication date: 20110112 Termination date: 20120904 |