CN102571006B - The bias current control method of operational amplifier and drive circuit - Google Patents
The bias current control method of operational amplifier and drive circuit Download PDFInfo
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- CN102571006B CN102571006B CN201010616059.5A CN201010616059A CN102571006B CN 102571006 B CN102571006 B CN 102571006B CN 201010616059 A CN201010616059 A CN 201010616059A CN 102571006 B CN102571006 B CN 102571006B
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Abstract
The invention discloses a kind of bias current control method for operational amplifier, wherein operational amplifier promotes its inner slew rate through bias control system, and this bias current control method comprises detection slew rate operation signal; Judge the signal period size of slew rate operation signal, to produce a judgement signal; And according to judging signal and slew rate operation signal, produce the operator scheme that bias voltage modulating signal makes it to change operational amplifier.
Description
Technical field
The present invention relates to a kind of bias current control method for operational amplifier and associated driver circuitry.
Background technology
Operational amplifier is an important circuit element in various electronic circuit.Circuit designers can use operational amplifier to realize different operational functions.Such as, in the drive circuit of liquid crystal display, operational amplifier is often applied to an output buffer, its analog signal exported according to prime digital to analog converter, discharge and recharge is carried out, with pixel cell corresponding in driving liquid crystal displays to load (i.e. liquid crystal).But, along with the raising of display size and resolution, the data volume that the drive circuit time per unit of liquid crystal display exports also gets more and more, the therefore reaction speed of operational amplifier, and namely slew rate (Slew Rate) also must improve significantly.
In general, operational amplifier is generally 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 is then used for promoting capacitive character that operational amplifier connects or resistive load.Because conventional operational amplifiers has the problem of loop stability degree deficiency, known operational amplifier can carry out frequency compensation by miller-compensated (MillerCompensation) electric capacity, to reach the effect of stable loop usually.Known operational amplifier is when driving load, and the bias current that slew rate is often transfused to grade circuit affected, and driving force is restricted.Specifically, the reaction speed (slew rate) of operational amplifier depends on the inner bias current of input stage circuit of operational amplifier and the driving force of output-stage circuit, usually represents by following slew rate equation: slew rate
wherein, I is bias current, and C is the size of internal capacitance, and Δ V then represents the change in voltage that operational amplifier exports, and t is the time.That is, the reaction speed of operational amplifier is determined the charge/discharge rates of the internal capacitance of operational amplifier by the bias current of input stage circuit.When bias current is larger, it is relatively faster to the speed of the discharge and recharge of internal capacitance, and certainly, the reaction speed of operational amplifier is also faster.Therefore, prior art can promote the slew rate of operational amplifier inside usually by the bias current increasing input stage circuit, to accelerate operational amplifier actuating speed.
For example, please refer to Fig. 1, Fig. 1 is the known schematic diagram with the one drive circuit 10 of slew rate enhanced feature.Drive circuit 10 comprises 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 load LOAD.Bias current control unit 104 is used for a bias current size of control algorithm 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; usual meeting is when operational amplifier 102 is not yet opened load LOAD discharge and recharge; the bias current I of operational amplifier 102 is improved by bias current control unit 104; to promote the inside slew rate of operational amplifier 102; thus; when driving load LOAD (also namely carrying out discharge and recharge to load LOAD); just be unlikely to be limited to the impact that the inside slew rate of operational amplifier 102 is too small, and the driving force needed for fast driving load LOAD can be reached.Please refer to Fig. 2, Fig. 2 is the coherent signal oscillogram of the drive circuit 10 in Fig. 1.Wherein a payload input sig LD is used to refer to operational amplifier 102 and drives load LOAD, suppose the drop edge at payload input sig LD, operational amplifier 102 can start load LOAD discharge and recharge, in other words, before the drop edge of payload input sig LD, the inside slew rate of operational amplifier 102 promotes program and namely must be done.As shown in Figure 2, during T1, the bias current of operational amplifier 102 controls at a high potential by bias current control unit 104, to promote its slew rate.During T2, because inner slew rate promotes, therefore, the bias current of operational amplifier 102 controls at a normal running current potential by bias current control unit 104.During T3, as shown in Figure 2, output voltage VO starts to rise until one drives current potential.During T2, that is, after the slew rate of operational amplifier 102 obtains lifting, before operational amplifier 102 starts to drive load LOAD, operational amplifier 102 does not need to carry out any operation, therefore, in during T2, to on foot make provided bias current void consumption, and cause many extra power consumptions, for quite unfavorable the electronic installation needing power saving.
Summary of the invention
Main purpose of the present invention is to provide a kind of bias current control method for operational amplifier and associated driver circuitry, to reduce extra power consumption.
For achieving the above object, according to an aspect of the present invention, there is provided a kind of bias current control method for operational amplifier, wherein this operational amplifier promotes its inner slew rate through a high bias current system, and this bias current control method comprises detection one slew rate operation signal; Judge the signal period size of this slew rate operation signal, to produce a judgement signal; And according to this judgement signal and this slew rate operation signal, produce this high bias current modulating signal and a low bias current modulating signal to this operational amplifier.
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 detection one slew rate operation signal, and judges the signal period size of this slew rate operation signal, to produce a judgement signal; 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 according to system requirements the bias current of dynamic conditioning operational amplifier, can before operational amplifier starts to carry out discharge and recharge to external loading, in time complete the object of the inside slew rate promoting operational amplifier, and in the remaining stand-by period, provide low bias current, to reduce the consumption of system.In other words, the present invention can allow operational amplifier before driving external loading, namely has enough driving forces, and can effectively save unnecessary power consumption, to reach system of optimizing usefulness.
Accompanying drawing explanation
Fig. 1 is the known schematic diagram with the one drive circuit of slew rate enhanced feature.
Fig. 2 is the coherent signal oscillogram of the drive circuit in Fig. 1.
Fig. 3 is the schematic diagram of the bias current control flow for operational amplifier of the embodiment of the present invention.
Fig. 4 is the schematic diagram of the one drive circuit of the embodiment of the present invention.
Fig. 5 is the coherent signal oscillogram of the drive circuit of Fig. 4.
Wherein, description of reference numerals is as follows:
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
HI height bias current modulating signal
I bias current
LD payload input sig
The low bias current modulating signal of LI
LOAD load
SD judges signal
SR slew rate operation signal
VI input voltage
VO output voltage
Embodiment
Please refer to Fig. 3, Fig. 3 is the schematic diagram of the embodiment of the present invention for a bias current control flow 30 of operational amplifier.Flow process 30 comprises the following step:
Step 300: start.
Step 302: detect a slew rate operation signal.
Step 304: the signal period size judging slew rate operation signal, to produce a judgement signal.
Step 306: according to judging signal and slew rate operation signal, generation one high bias current modulating signal or a low bias current modulating signal are to operational amplifier.
Step 308: terminate.
According to flow process 30, before operational amplifier starts to drive external loading, the present invention according to detected slew rate operation signal, can judge its signal period size, to produce corresponding judgement signal.Then, the present invention is according to judging signal, the signal of slew rate operation signal duration, produce high bias current modulating signal to operational amplifier, so that the object of the slew rate promoting operational amplifier can be completed before driving external loading smoothly, then, low bias current modulating signal is produced to operational amplifier, to reduce the power consumption of operational amplifier.Therefore, through the operation of flow process 30, the present invention is before operational amplifier starts to drive load, can according to judging signal, there is provided corresponding high bias current modulating signal and low bias current modulating signal to operational amplifier respectively, thus, except can complete strengthening operational amplifier inside slew rate and except lifting operation reaction speed, more can reduce the total system power consumption started before driving load, and reach power saving benefit.
Please refer to Fig. 4, Fig. 4 is the schematic diagram of the one drive circuit 40 of the embodiment of the present invention.Drive circuit 40 is used for realizing flow process 30 of the present invention, and it comprises operational amplifier 402, 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 load LOAD.Detecting unit 404 is used for detection one slew rate operation signal SR, and judges the signal period size of slew rate operation signal SR, to produce a judgement signal SD.During the signal period of slew rate operation signal SR, bias current control unit 406 is used for according to judging signal SD, produces an a high bias current modulating signal HI and low bias current modulating signal LI to operational amplifier 402.In brief, during slew rate operation signal, bias current control unit 406 can produce high bias current modulating signal HI and be supplied to operational amplifier 402, thus, the bias current of operational amplifier 402 will be strengthened according to this, and its inner slew rate will promote thereupon, and reach required slew rate.Further, during the signal period of slew rate operation signal, after the inside slew rate of operational amplifier 402 is promoted, until before starting to drive load LOAD, operational amplifier 402 does not need to carry out other operation usually, therefore, bias current control unit 406 can produce low bias current modulating signal LI and be supplied to operational amplifier 402, make operational amplifier 402 can reduce its operation bias current before starting to drive load LOAD, and do not need to consume unnecessary electric current, and system power can be made to reach more effective utilization.
In embodiments of the present invention, preferably, bias current size required when high bias current modulating signal HI is greater than operational amplifier 402 normal running.In like manner, required during low bias current modulating signal LI less-than operation amplifier 402 normal running bias current size.Therefore, when high bias current modulating signal HI is provided to operational amplifier 402, the slew rate of operational amplifier 402 can successfully be promoted.When low bias current modulating signal LI is provided to operational amplifier 402, because operational amplifier 402 is without any operational requirements, therefore, low bias current modulating signal LI 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 the slew rate that operational amplifier 402 can be made to reach required, high bias current modulating signal HI is except bias current size required when size of current can be greater than operational amplifier 402 normal running, the frequency of high bias current modulating signal HI and signal period, suitable change will be done according to required slew rate.In addition, low bias current modulating signal LI is except bias current size required during size of current meeting less-than operation amplifier 402 normal running, its frequency and signal period, also can according to the design of system, such as operational amplifier 402 starts the opportunity driving load LOAD, and does suitable change.
On the other hand, slew rate operation signal SR can be used as an index signal of carrying out slew rate lifting.Such as, slew rate operation signal SR can be created within a payload input sig LD initial before.In the case, bias current control unit 406 will during the signal period of slew rate operation signal SR in, complete the program of slew rate promoting operational amplifier 402, thus, before starting to drive load LOAD, namely have enough driving forces.For example, bias current control unit 406 can during a signal period of slew rate operation signal SR in, sequentially produce high bias current modulating signal HI and low bias current modulating signal LI 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, then represent that drive circuit 40 can utilize the signal period length of slew rate operation signal SR fully, and can before starting to drive load LOAD, have enough driving forces, and effectively save unnecessary power consumption, to reach system of optimizing usefulness.Certainly, the summation of the signal period of high bias current modulating signal HI and the signal period of 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 judging that signal SD indicates the signal period of slew rate operation signal SR to be less than the 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 judging that signal SD indicates the signal period of slew rate operation signal SR to be greater than the 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, illustrating further below, 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 a liquid crystal display, be used for driving liquid crystal pixel, that is, load LOAD is liquid crystal pixel (capacitive load).As shown in Figure 5, payload input sig LD is a periodic pulse signal, and when payload input sig LD is in electronegative potential, operational amplifier 402 can carry out discharge and recharge action to load LOAD.Otherwise when payload input sig LD is in high potential, operational amplifier 402 can not carry out discharge and recharge action to load LOAD.In this embodiment, the payload input sig LD of high potential can be utilized as slew rate operation signal SR, that is, by during T1 with T2 during payload input sig LD be considered as slew rate operation signal SR.Therefore, when drive circuit 40 comes into operation, first, detecting unit 404 can detect slew rate operation signal SR, and after slew rate operation signal SR being detected, judges the signal period size of slew rate operation signal SR, judges signal SD to produce.Then, during T1, bias current control unit 406, according to judging signal SD, produces high bias current modulating signal HI to operational amplifier 402, to promote the inside slew rate of operational amplifier 402.During T2, bias current control unit 406, according to judging signal SD, produces low bias current modulating signal LI to operational amplifier 402, and can make the electric energy of drive circuit 40 consumes least during T2.During having arrived T3, because operational amplifier 402 has had enough driving forces, therefore output voltage VO just can rise to required current potential within the shortest time, and completes driving object.
In sum, the present invention can according to system requirements the mechanism of the bias current of dynamic conditioning operational amplifier, can before operational amplifier starts to carry out discharge and recharge to external loading, in time complete the object of the inside slew rate promoting operational amplifier, and in the remaining stand-by period, provide low bias current, to reduce the consumption of system.In other words, the present invention can allow operational amplifier before driving external loading, namely has enough driving forces, and can effectively save unnecessary power consumption, to reach system of optimizing usefulness.
The foregoing is only the preferred embodiments of the present invention, all equalizations done according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (18)
1., for a bias current control method for operational amplifier, comprise:
Detect a slew rate operation signal;
Judge the signal period size of this slew rate operation signal, to produce a judgement signal; And
According to this judgement signal and this slew rate operation signal, generation one high bias current modulating signal or a low bias current modulating signal are to this operational amplifier;
It is characterized in that, when the signal period of this this slew rate operation signal of judgement signal designation is less than the signal period of this high bias current modulating signal, produce this high bias current modulating signal and this low bias current modulating signal to this operational amplifier.
2. bias current control method as claimed in claim 1, it is characterized in that, according to this judgement signal and this slew rate operation signal, produce this high bias current modulating signal maybe this low bias current modulating signal to the step of this operational amplifier be according to this judgement signal and this slew rate operation signal, in during a signal period of this slew rate operation signal, sequentially produce this high bias current modulating signal and this low bias current modulating signal to this operational amplifier.
3. bias current control method as claimed in claim 1, it is characterized in that, the signal period being included in this this slew rate operation signal of judgement signal designation is further when being greater than the 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.
4. bias current control method as claimed in claim 1, it 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.
5. bias current control method as claimed in claim 1, it is characterized in that, this slew rate operation signal is produced before a payload input sig is initial.
6. bias current control method as claimed in claim 5, it is characterized in that, the end point of this slew rate operation signal is the starting point of this payload input sig.
7. bias current control method as claimed in claim 1, it is characterized in that, bias current size required when this high bias current modulating signal is greater than this operational amplifier normal running, and bias current size required when this low bias current modulating signal is less than this operational amplifier normal running.
8., for a bias current control method for operational amplifier, comprise:
Detect a slew rate operation signal;
Judge the signal period size of this slew rate operation signal, to produce a judgement signal; And
According to this judgement signal and this slew rate operation signal, generation one high bias current modulating signal or a low bias current modulating signal are to this operational amplifier;
It is characterized in that, according to this judgement signal, during one first signal period of this slew rate operation signal in produce this high bias current modulating signal to this operational amplifier, and during a secondary signal cycle of this slew rate operation signal in produce this low bias current modulating signal to this operational amplifier.
9., for a bias current control method for operational amplifier, comprise:
Detect a slew rate operation signal;
Judge the signal period size of this slew rate operation signal, to produce a judgement signal; And
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, wherein the summation of the signal period of this high bias current modulating signal and the signal period of this low bias current modulating signal equals the signal period of this slew rate operation signal.
10. a drive circuit, comprises
One operational amplifier;
One detecting unit, is used for detection one slew rate operation signal, and judges the signal period size of this slew rate operation signal, to produce a judgement signal; And
One bias current control unit, is used for according to this judgement signal and this slew rate operation signal, and generation one high bias current modulating signal or a low bias current modulating signal are to this operational amplifier;
It is characterized in that, this bias current control unit, when the signal period of this this slew rate operation signal of judgement signal designation is less than the signal period of this high bias current modulating signal, produces this high bias current modulating signal and this low bias current modulating signal to this operational amplifier.
11. drive circuits as claimed in claim 10, it is characterized in that, this bias current control unit is according to this judgement signal and this slew rate operation signal, during a signal period of this slew rate operation signal, sequentially produce this high bias current modulating signal and this low bias current modulating signal to this operational amplifier.
12. drive circuits as claimed in claim 10, it is characterized in that, when the signal period of this this slew rate operation signal of judgement signal designation is greater than the signal period of this high bias current modulating signal, during the signal period of this bias current control unit only during this slew rate operation signal, produce this high bias current modulating signal to this operational amplifier.
13. drive circuits as claimed in claim 10, 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 circuits as claimed in claim 10, it is characterized in that, this slew rate operation signal is produced before a payload input sig is initial.
15. drive circuits as claimed in claim 14, is characterized in that, the end point of this slew rate operation signal is the starting point of this payload input sig.
16. drive circuits as claimed in claim 10, it is characterized in that, bias current size required when this high bias current modulating signal is greater than this operational amplifier normal running, and bias current size required when this low bias current modulating signal is less than this operational amplifier normal running.
17. 1 kinds of drive circuits, comprise
One operational amplifier;
One detecting unit, is used for detection one slew rate operation signal, and judges the signal period size of this slew rate operation signal, to produce a judgement signal; And
One bias current control unit, is used for according to this judgement signal and this slew rate operation signal, and generation one high bias current modulating signal or a low bias current modulating signal are to this operational amplifier;
It is characterized in that, this bias current control unit according to this judgement signal during one first signal period of this slew rate operation signal in produce this high bias current modulating signal to this operational amplifier, and during a secondary signal cycle of this slew rate operation signal in produce this low bias current modulating signal to this operational amplifier.
18. 1 kinds of drive circuits, comprise
One operational amplifier;
One detecting unit, is used for detection one slew rate operation signal, and judges the signal period size of this slew rate operation signal, to produce a judgement signal; And
One 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, wherein the summation of the signal period of this high bias current modulating signal and the signal period of this low bias current modulating signal equals the signal period of this slew rate operation signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510396685.0A CN105048975B (en) | 2010-12-30 | 2010-12-30 | The bias current control method and driving circuit of operational amplifier |
| 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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| 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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| CN102571006B true CN102571006B (en) | 2015-09-02 |
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| US8912849B2 (en) * | 2013-04-30 | 2014-12-16 | Mstar Semiconductor, Inc. | Adaptive operational amplifier bias current |
| 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 |
| CN106448579B (en) * | 2016-03-25 | 2020-06-09 | 北京集创北方科技股份有限公司 | Low-power source electrode driving circuit and display device |
| CN113936620B (en) * | 2021-12-15 | 2022-03-04 | 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 |
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|---|---|---|---|---|
| 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 |
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| JP4852021B2 (en) * | 2007-11-15 | 2012-01-11 | 株式会社東芝 | Amplifier |
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Patent Citations (3)
| 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 |
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| CN105048975B (en) | 2018-09-18 |
| CN102571006A (en) | 2012-07-11 |
| CN105048975A (en) | 2015-11-11 |
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