CN102571006A - Bias current control method for operational amplifier and driving circuit - Google Patents
Bias current control method for operational amplifier and driving circuit Download PDFInfo
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- CN102571006A CN102571006A CN2010106160595A CN201010616059A CN102571006A CN 102571006 A CN102571006 A CN 102571006A CN 2010106160595 A CN2010106160595 A CN 2010106160595A CN 201010616059 A CN201010616059 A CN 201010616059A CN 102571006 A CN102571006 A CN 102571006A
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Abstract
The invention discloses a bias current control method for an operational amplifier. The operation amplifier promotes an internal slew rate through a bias current control system. The bias current control method comprises the following steps of: detecting a slew rate operation signal; judging a signal period of the slew rate operation signal so as to generate a judging signal; and generating a bias modulation signal according to the judging signal and the slew rate operation signal, so that the bias modulation signal can change operation modes of the operational amplifier.
Description
Technical field
The present invention relates to a kind of bias current control method and associated driver circuitry that is used for operational amplifier.
Background technology
Operational amplifier is important circuit element in the various electronic circuits.Circuit designers can use operational amplifier to realize different operational functions.For example; In the drive circuit of LCD, operational amplifier often is applied to an output buffer, the analog signal that it is exported according to the prime digital to analog converter; Load (being liquid crystal) is discharged and recharged, with corresponding pixel cell on the driving liquid crystal device.Yet along with the raising of LCD size and resolution, the data volume that the drive circuit time per unit of LCD is exported is also more and more, so the reaction speed of operational amplifier, and promptly slew rate (Slew Rate) also must improve significantly.
In general, operational amplifier is generally the secondary structure circuit, mainly comprises an input stage circuit and an output-stage circuit.Input stage circuit is used for improving the gain of operational amplifier, and output-stage circuit then is used for promoting capacitive character or the resistive load that operational amplifier connects.Because the conventional operation amplifier has the not enough problem of loop stability, known operational amplifier can carry out frequency compensation through miller-compensated (MillerCompensation) electric capacity usually, to reach the effect of stable loop.Known operational amplifier is when driving load, and the bias current that slew rate tends to be transfused to grade circuit influences, and driving force is restricted.In detail; The reaction speed of operational amplifier (slew rate) depends on the bias current of the inner input stage circuit of operational amplifier and the driving force of output-stage circuit; Usually can represent through following slew rate equation: slew rate
wherein; I is a bias current; C is the size of internal capacitance, the change in voltage that on behalf of operational amplifier, Δ V then export, and t is the time.That is to say that the reaction speed of operational amplifier is by the speed that the discharges and recharges decision to the internal capacitance of operational amplifier of the bias current of input stage circuit.When bias current was big more, its speed that discharges and recharges to internal capacitance was fast relatively more, and certainly, the reaction speed of operational amplifier is also just fast more.Therefore, prior art can promote the inner slew rate of operational amplifier through the bias current that increases input stage circuit usually, to accelerate the operational amplifier actuating speed.
For instance, please refer to Fig. 1, Fig. 1 is known sketch map with one drive circuit 10 of slew rate enhanced feature.Drive circuit 10 comprises an operational amplifier 102 and a bias current control unit 104.Operational amplifier 102 is used for according to an input voltage VI, produces output voltage VO to a load LOAD.Bias current control unit 104 is used for controlling the bias current size of operational amplifier 102, to promote the inside slew rate of operational amplifier 102.In general; In order to promote the reaction speed of operational amplifier 102; Usually can not open as yet when load LOAD discharged and recharged at operational amplifier 102, improve the bias current I of operational amplifiers 102 through bias current control unit 104, to promote the inside slew rate of operational amplifier 102; Thus; When driving load LOAD (also promptly load LOAD being discharged and recharged), just be unlikely to be subject to the too small influence of inside slew rate of operational amplifier 102, and can reach the required driving force of fast driving load LOAD.Please refer to Fig. 2, Fig. 2 is the coherent signal oscillogram of the drive circuit 10 among Fig. 1.Wherein a load input signal LD is used for indicating operational amplifier 102 to drive load LOAD; Suppose drop edge at load input signal LD; Operational amplifier 102 can begin load LOAD is discharged and recharged; In other words, before the drop edge of load input signal LD, the inside slew rate lifting program of operational amplifier 102 promptly must be done.As shown in Figure 2, during T1, bias current control unit 104 is controlled at a high potential with the bias current of operational amplifier 102, to promote its slew rate.During T2, because inner slew rate promotes, therefore, bias current control unit 104 is controlled at a normal running current potential with the bias current of operational amplifier 102.During T3, as shown in Figure 2, output voltage VO begins to rise until a drive potential.Owing in during T2, that is to say, after the slew rate of operational amplifier 102 obtains to promote; Until operational amplifier 102 begins to drive before the load LOAD, operational amplifier 102 need not carry out any operation, therefore; During T2; The bias current that is provided is empty to be consumed with making on foot, and causes many extra power consumption, quite unfavorable for the electronic installation that needs power saving.
Summary of the invention
Main purpose of the present invention is to provide a kind of bias current control method and associated driver circuitry that is used for operational amplifier, to reduce extra power consumption.
For realizing above-mentioned purpose; According to an aspect of the present invention; A kind of bias current control method that is used for operational amplifier is provided, and wherein this operational amplifier sees through a high bias current system and promotes its inner slew rate, and this bias current control method comprises and detects a slew rate operation signal; Judge the signal period size of this slew rate operation signal, judge signal to produce one; And, produce this a high bias current modulating signal and a low bias current modulating signal to this operational amplifier according to this judgement signal and this slew rate operation signal.
According to another aspect of the present invention, a kind of drive circuit is provided, comprises: an operational amplifier; One detecting unit is used for detecting a slew rate operation signal, and judges the signal period size of this slew rate operation signal, judges signal to produce one; And a bias current control unit, be used for according to this judgement signal and this slew rate operation signal, produce a high bias current modulating signal or a low bias current modulating signal to this operational amplifier.
The present invention can dynamically adjust the bias current of operational amplifier according to system requirements; Can be before operational amplifier begins external loading discharged and recharged; In time accomplish the purpose of the inside slew rate that promotes operational amplifier; And low bias current was provided in the remaining stand-by period, to reduce the consumption of system.In other words, the present invention can let operational amplifier before driving external loading, promptly has enough driving forces, and can save unnecessary power consumption effectively, to reach system of optimizing usefulness.
Description of drawings
Fig. 1 is known sketch map with one drive circuit of slew rate enhanced feature.
Fig. 2 is the coherent signal oscillogram of the drive circuit among Fig. 1.
Fig. 3 is the sketch map of a bias current control flow that is used for operational amplifier of the embodiment of the invention.
Fig. 4 is the sketch map of the one drive circuit of the embodiment of the invention.
Fig. 5 is the coherent signal oscillogram of the drive circuit of Fig. 4.
Wherein, description of reference numerals is following:
10,40 drive circuits
102,402 operational amplifiers
104,406 bias current control units
30 flow processs
300,302,304, step
306、308
404 detecting units
The high bias current modulating signal of HI
The I bias current
LD load input signal
LI hangs down the bias current modulating signal
The LOAD load
SD judges signal
SR slew rate operation signal
The VI input voltage
The VO output voltage
Embodiment
Please refer to Fig. 3, Fig. 3 is used for the sketch map of a bias current control flow 30 of operational amplifier for the embodiment of the invention.Flow process 30 comprises the following step:
Step 300: beginning.
Step 302: detect a slew rate operation signal.
Step 304: judge the signal period size of slew rate operation signal, judge signal to produce one.
Step 306:, produce a high bias current modulating signal or a low bias current modulating signal to operational amplifier according to judging signal and slew rate operation signal.
Step 308: finish.
According to flow process 30, before operational amplifier began to drive external loading, the present invention can judge its signal period size, to produce corresponding judgement signal according to detected slew rate operation signal.Then; The present invention the duration of the signal of slew rate operation signal, produces high bias current modulating signal to operational amplifier according to judging signal; Before driving external loading, can accomplish the purpose of the slew rate that promotes operational amplifier smoothly; Then, produce low bias current modulating signal to operational amplifier, to reduce the power consumption of operational amplifier.Therefore, see through the operation of flow process 30, the present invention is before operational amplifier begins to drive load; Can be according to judging signal; Provide corresponding high bias current modulating signal and low bias current modulating signal to operational amplifier respectively, thus, promote the operant response speed except accomplishing the inside slew rate of strengthening operational amplifier; More can reduce and begin to drive the preceding total system power consumption of load, and reach the power saving benefit.
Please refer to Fig. 4, Fig. 4 is the sketch map of the one drive circuit 40 of the embodiment of the invention.Drive circuit 40 is used for realizing flow process 30 of the present invention, and it comprises an operational amplifier 402, a detecting unit 404 and a bias current control unit 406.Operational amplifier 402 is used for according to an input voltage VI, produces output voltage VO to a load LOAD.Detecting unit 404 is used for detecting a slew rate operation signal SR, and judges the signal period size of slew rate operation signal SR, judges signal SD to produce one.During the signal period of slew rate operation signal SR, bias current control unit 406 is used for according to judging signal SD, produces a high bias current modulating signal HI and a low bias current modulating signal LI to operational amplifier 402.In brief; During the slew rate operation signal; Bias current control unit 406 can produce high bias current modulating signal HI and offer operational amplifier 402, and thus, the bias current of operational amplifier 402 will be strengthened according to this; And its inner slew rate will promote thereupon, and reaches required slew rate.Further; During the signal period of slew rate operation signal, after the inside of operational amplifier 402 slew rate is raised, until begin to drive before the load LOAD; Operational amplifier 402 need not carry out other operation usually; Therefore, bias current control unit 406 can produce low bias current modulating signal LI and offer operational amplifier 402, makes operational amplifier 402 begin to reduce its operation bias current before driving load LOAD; And need not consume unnecessary electric current, and can make system power reach more efficient use.
In embodiments of the present invention, preferably, high bias current modulating signal HI required bias current size during greater than operational amplifier 402 normal runnings.Bias current required when in like manner, hanging down 402 normal runnings of bias current modulating signal LI less-than operation amplifier is big or small.Therefore, when high bias current modulating signal HI is provided for operational amplifier 402, can successfully promote the slew rate of operational amplifier 402.When low bias current modulating signal LI is provided for operational amplifier 402; Because operational amplifier 402 no any operational requirements, therefore, low bias current modulating signal LI will can not have any impact to the operation of operational amplifier 402; The thing followed can reduce the loss of system.Certainly; In order to make operational amplifier 402 reach required slew rate; When high bias current modulating signal HI can be greater than operational amplifier 402 normal runnings except size of current the required bias current size; Frequency and the signal period of high bias current modulating signal HI, will do suitable variation according to required slew rate.In addition; When low bias current modulating signal LI can 402 normal runnings of less-than operation amplifier except size of current the required bias current size; Its frequency and signal period; Also can be according to the design of system, for example operational amplifier 402 begins to drive the opportunity of load LOAD, and does suitable variation.
On the other hand, slew rate operation signal SR can be used as and carries out the index signal that slew rate promotes.For example, slew rate operation signal SR can be created within a load input signal LD initial before.In the case, bias current control unit 406 will be during the signal period of slew rate operation signal SR in, accomplish the program of the slew rate that promotes operational amplifier 402, thus, beginning promptly to have enough driving forces before driving load LOAD.For instance, bias current control unit 406 can be during the signal period of slew rate operation signal SR in, produce high bias current modulating signal HI and low bias current modulating signal LI in regular turn to operational amplifier 402.In the case; If the summation of the signal period of the signal period of high bias current modulating signal HI and low bias current modulating signal LI equals the signal period of slew rate operation signal SR; Represent that then drive circuit 40 can utilize the signal period length of slew rate operation signal SR fully, and can before beginning to drive load LOAD, have enough driving forces; And save unnecessary power consumption effectively, to reach system of optimizing usefulness.Certainly, the summation of the signal period of the signal period of high bias current modulating signal HI and low bias current modulating signal LI also can be greater than or less than the signal period of slew rate operation signal SR.
In addition; When signal period of judging signal SD indication slew rate operation signal SR during less than signal period of high bias current modulating signal HI, bias current control unit 406 can produce high bias current modulating signal HI and low bias current modulating signal LI to operational amplifier 402.When signal period of judging signal SD indication slew rate operation signal SR during greater than signal period of high bias current modulating signal HI, bias current control unit 406 can produce high bias current modulating signal HI to operational amplifier 402.
In order to clearly demonstrate the mode of operation of drive circuit 40, below further illustrate, please refer to Fig. 5, Fig. 5 is the coherent signal oscillogram of the drive circuit 40 of Fig. 4.If drive circuit 40 is applied in the LCD, be used for driving liquid crystal pixel, that is to say that load LOAD is liquid crystal pixel (capacitive load).As shown in Figure 5, load input signal LD is the pulse signal of one-period property, and when load input signal LD was in electronegative potential, operational amplifier 402 can discharge and recharge action to load LOAD.Otherwise when load input signal LD was in high potential, operational amplifier 402 can not discharge and recharge action to load LOAD.In this embodiment, the load input signal LD of high potential capable of using that is to say as slew rate operation signal SR, with during the T1 with T2 during load input signal LD be regarded as slew rate operation signal SR.Therefore, when drive circuit 40 came into operation, at first, detecting unit 404 can detect slew rate operation signal SR, and after detecting slew rate operation signal SR, judged the signal period size of slew rate operation signal SR, judged signal SD to produce.Then, during T1, bias current control unit 406 produces high bias current modulating signal HI to operational amplifier 402 according to judging signal SD, to promote the inside slew rate of operational amplifier 402.During T2, bias current control unit 406 produces low bias current modulating signal LI to operational amplifier 402 according to judging signal SD, and can make the electric energy of drive circuit 40 consumes least during T2.Arrived during the T3, because operational amplifier 402 had enough driving forces, so output voltage VO just can rise to required current potential in the shortest time, and accomplishes driving purposes.
In sum; The present invention can dynamically adjust the mechanism of the bias current of operational amplifier according to system requirements; Can be before operational amplifier begins external loading discharged and recharged; In time accomplish the purpose of the inside slew rate that promotes operational amplifier, and low bias current was provided in the remaining stand-by period, to reduce the consumption of system.In other words, the present invention can let operational amplifier before driving external loading, promptly has enough driving forces, and can save unnecessary power consumption effectively, to reach system of optimizing usefulness.
The above is merely the preferred embodiments of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (16)
1. bias current control method that is used for operational amplifier comprises:
Detect a slew rate operation signal;
Judge the signal period size of this slew rate operation signal, judge signal to produce one; And
Judge signal and this slew rate operation signal according to this, produce a high bias current modulating signal or a low bias current modulating signal to this operational amplifier.
2. bias current control method as claimed in claim 1; It is characterized in that; Judge signal and this slew rate operation signal according to this; Producing the step that this high bias current modulating signal maybe should low bias current modulating signal to this operational amplifier is according to this judgements signal and this slew rate operation signal, during a signal period of this slew rate operation signal in, produce this high bias current modulating signal in regular turn and be somebody's turn to do and hang down the bias current modulating signal to this operational amplifier.
3. bias current control method as claimed in claim 1; It is characterized in that; Judge signal and this slew rate operation signal according to this; Produce step that this high bias current modulating signal maybe should low bias current modulating signal to this operational amplifier and be in signal period of this this slew rate operation signal of judgements signal indication during, produces this high bias current modulating signal and be somebody's turn to do and hang down the bias current modulating signal to this operational amplifier less than signal period of this high bias current modulating signal.
4. bias current control method as claimed in claim 1; It is characterized in that; The signal period that further is included in this slew rate operation signal of this judgement signal indication is during greater than signal period of this high bias current modulating signal; In only during a signal period of this slew rate operation signal, produce this high bias current modulating signal to this operational amplifier.
5. bias current control method as claimed in claim 1 is characterized in that, the summation of the signal period of the signal period of this high bias current modulating signal and this low bias current modulating signal equals the signal period of this slew rate operation signal.
6. bias current control method as claimed in claim 1 is characterized in that, this slew rate operation signal is produced before a load input signal is initial.
7. bias current control method as claimed in claim 6 is characterized in that, the end point of this slew rate operation signal is the starting point of this load input signal.
8. bias current control method as claimed in claim 1; It is characterized in that; This high bias current modulating signal required bias current size during greater than this operational amplifier normal running, and should low bias current modulating signal required bias current size during less than this operational amplifier normal running.
9. a drive circuit comprises
One operational amplifier;
One detecting unit is used for detecting a slew rate operation signal, and judges the signal period size of this slew rate operation signal, judges signal to produce one; And
One bias current control unit is used for according to this judgement signal and this slew rate operation signal, produces a high bias current modulating signal or a low bias current modulating signal to this operational amplifier.
10. drive circuit as claimed in claim 9; It is characterized in that; This bias current control unit is judged signal and this slew rate operation signal according to this; During a signal period of this slew rate operation signal, produce this high bias current modulating signal in regular turn and should hang down the bias current modulating signal to this operational amplifier.
11. drive circuit as claimed in claim 9; It is characterized in that; This bias current control unit is in this signal period of judging this slew rate operation signal of signal indication during less than signal period of this high bias current modulating signal, produces this high bias current modulating signal and hangs down the bias current modulating signal to this operational amplifier with being somebody's turn to do.
12. drive circuit as claimed in claim 9; It is characterized in that; In this signal period of judging this slew rate operation signal of signal indication during greater than signal period of this high bias current modulating signal; This bias current control unit only during the signal period during this slew rate operation signal, produces this high bias current modulating signal to this operational amplifier.
13. drive circuit as claimed in claim 9 is characterized in that, the summation of the signal period of the signal period of this high bias current modulating signal and this low bias current modulating signal equals the signal period of this slew rate operation signal.
14. drive circuit as claimed in claim 9 is characterized in that, this slew rate operation signal is produced before a load input signal is initial.
15. drive circuit as claimed in claim 14 is characterized in that, the end point of this slew rate operation signal is the starting point of this load input signal.
16. drive circuit as claimed in claim 9; It is characterized in that; This high bias current modulating signal required bias current size during greater than this operational amplifier normal running, and should low bias current modulating signal required bias current size during less than this operational amplifier normal running.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010616059.5A CN102571006B (en) | 2010-12-30 | 2010-12-30 | The bias current control method of operational amplifier and drive circuit |
| CN201510396685.0A CN105048975B (en) | 2010-12-30 | 2010-12-30 | The bias current control method and driving circuit of operational amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010616059.5A CN102571006B (en) | 2010-12-30 | 2010-12-30 | The bias current control method of operational amplifier and drive circuit |
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| CN201510396685.0A Division CN105048975B (en) | 2010-12-30 | 2010-12-30 | The bias current control method and driving circuit of operational amplifier |
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| CN102571006A true CN102571006A (en) | 2012-07-11 |
| CN102571006B CN102571006B (en) | 2015-09-02 |
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| CN201010616059.5A Active CN102571006B (en) | 2010-12-30 | 2010-12-30 | The bias current control method of operational amplifier and drive circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020808A (en) * | 2014-06-13 | 2014-09-03 | 深圳芯邦科技股份有限公司 | Driving capacity adjustment method of interface driving circuit and circuit |
| CN104143962A (en) * | 2013-04-30 | 2014-11-12 | 晨星半导体股份有限公司 | Operational amplifier and operating method thereof |
| CN106448579A (en) * | 2016-03-25 | 2017-02-22 | 北京集创北方科技股份有限公司 | Low-power source drive circuit and display device |
| CN113936620A (en) * | 2021-12-15 | 2022-01-14 | 常州欣盛半导体技术股份有限公司 | Source driver and control method of input stage comparator thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4859955A (en) * | 1985-11-06 | 1989-08-22 | The Grass Valley Group, Inc. | Apparatus for smoothing an abrupt change in signal level |
| CN1898872A (en) * | 2003-12-24 | 2007-01-17 | 艾利森电话股份有限公司 | A switched capacitor circuit compensation apparatus and method |
| CN101303824A (en) * | 2007-05-11 | 2008-11-12 | 三星电子株式会社 | Source line driver and method and display device including the source line driver |
| US20090131099A1 (en) * | 2007-11-15 | 2009-05-21 | Kabushiki Kaisha Toshiba | Amplifying device and radio |
-
2010
- 2010-12-30 CN CN201510396685.0A patent/CN105048975B/en active Active
- 2010-12-30 CN CN201010616059.5A patent/CN102571006B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4859955A (en) * | 1985-11-06 | 1989-08-22 | The Grass Valley Group, Inc. | Apparatus for smoothing an abrupt change in signal level |
| CN1898872A (en) * | 2003-12-24 | 2007-01-17 | 艾利森电话股份有限公司 | A switched capacitor circuit compensation apparatus and method |
| CN101303824A (en) * | 2007-05-11 | 2008-11-12 | 三星电子株式会社 | Source line driver and method and display device including the source line driver |
| US20090131099A1 (en) * | 2007-11-15 | 2009-05-21 | Kabushiki Kaisha Toshiba | Amplifying device and radio |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104143962A (en) * | 2013-04-30 | 2014-11-12 | 晨星半导体股份有限公司 | Operational amplifier and operating method thereof |
| CN104143962B (en) * | 2013-04-30 | 2018-03-27 | 晨星半导体股份有限公司 | Operational amplifier and its operating method |
| CN104020808A (en) * | 2014-06-13 | 2014-09-03 | 深圳芯邦科技股份有限公司 | Driving capacity adjustment method of interface driving circuit and circuit |
| CN104020808B (en) * | 2014-06-13 | 2015-11-18 | 深圳芯邦科技股份有限公司 | A kind of interface driving circuit driving force method of adjustment and circuit |
| CN106448579A (en) * | 2016-03-25 | 2017-02-22 | 北京集创北方科技股份有限公司 | Low-power source drive circuit and display device |
| CN113936620A (en) * | 2021-12-15 | 2022-01-14 | 常州欣盛半导体技术股份有限公司 | Source driver and control method of input stage comparator thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102571006B (en) | 2015-09-02 |
| CN105048975B (en) | 2018-09-18 |
| CN105048975A (en) | 2015-11-11 |
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