CN103731109B - Operational amplifier assembly and method for strengthening drive capacity of operational amplifier circuit - Google Patents
Operational amplifier assembly and method for strengthening drive capacity of operational amplifier circuit Download PDFInfo
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- CN103731109B CN103731109B CN201210387127.4A CN201210387127A CN103731109B CN 103731109 B CN103731109 B CN 103731109B CN 201210387127 A CN201210387127 A CN 201210387127A CN 103731109 B CN103731109 B CN 103731109B
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Abstract
The invention provides an operational amplifier assembly and a method for strengthening the drive capacity of an operational amplifier circuit. The operational amplifier assembly comprises the operational amplifier circuit and a comparison circuit. The operational amplifier circuit comprises an input stage circuit and an output stage circuit. The input stage circuit is used for receiving an input signal, and the output stage circuit is coupled to the input stage circuit and is used for strengthening the drive capacity of the input signal. The comparison circuit is coupled to the output stage circuit and is used for receiving the input signal and judging whether the input signal is changed or not to output an intelligent control signal to the output stage circuit, so that the drive capacity of the operational amplifier circuit is strengthened.
Description
Technical field
The invention relates to a kind of load drive component and the method for strengthening its driving force, and in particular to one
The method planted components for operational amplifier and strengthen the driving force of operation amplifier circuit.
Background technology
The driving force of existing operational amplifier is generally controlled by its internal output-stage circuit, this output-stage circuit one
As include an output transistor.In order to strengthen the driving force of operational amplifier, the mode for adopting at present is brilliant to increase this output
The breadth length ratio (width/length) of body pipe reducing its equivalent resistance, to reach the enhanced effect of driving force.Additionally, from electricity
From the perspective of the layout of road, above-mentioned output transistor actually would generally be using the layout type of multiple transistors come real
It is existing, therefore, to increase driving force by accelerating the charging rate of output transistor, it is often necessary to increase the crystalline substance of institute's layout
The number of body pipe.
However, no matter being to increase the breadth length ratio of output transistor, or increase the number of layout transistor, this two ways
Institute's usable floor area on chip will additionally be increased, economic benefit is not met.
The content of the invention
A kind of method that the present invention provides components for operational amplifier and strengthens the driving force of operation amplifier circuit.
The present invention provides a kind of components for operational amplifier, and its internal operational amplifier electricity is strengthened using a control signal
The driving force on road.
The present invention provides a kind of method of the driving force for strengthening operation amplifier circuit, is suitable for application in above-mentioned computing and puts
Big device assembly.
The present invention provides a kind of components for operational amplifier, including an operation amplifier circuit and a comparison circuit.Computing
Amplifier circuit includes an input stage circuit and an output-stage circuit.Input stage circuit is to receive an input signal.Output
Level circuit is coupled to input stage circuit, to the driving force for strengthening input signal.Comparison circuit is coupled to output-stage circuit, uses
With receives input signal, and judge whether input signal has change, to export the control signal of an enable to output-stage circuit
To strengthen the driving force of operation amplifier circuit.
In one embodiment of this invention, above-mentioned output-stage circuit includes a driving force control circuit.Driving force
Control circuit is coupled to comparison circuit, is controlled by control signal.During control signal is enable, driving force control circuit profit
Strengthen the driving force of operation amplifier circuit with a specific voltage.
In one embodiment of this invention, above-mentioned specific voltage is a system voltage or a ground voltage.
In one embodiment of this invention, above-mentioned output-stage circuit also includes one first output transistor.Driving force
Control circuit includes one second output transistor and a switch module.Second output transistor and the first output transistor are simultaneously
Connection.Switch module is coupled between the grid of the grid of the first output transistor and the second output transistor, is controlled by control letter
Number.During control signal is enable, switch module strengthens the driving force of operation amplifier circuit using specific voltage.
In one embodiment of this invention, above-mentioned switch module includes a first switch transistor and a second switch
Transistor.First switch transistor couples are received between the grid of the first output transistor and the grid of the second output transistor
Control in control signal.Second switch transistor couples are controlled by anti-between the grid and specific voltage of the second output transistor
The control signal of phase.When first switch transistor is to close (turn off), second switch transistor is unlatching (turn
On), allowing the grid of the second output transistor to be coupled to specific voltage.
In one embodiment of this invention, whether above-mentioned comparison circuit judges the magnitude of voltage or current value of the input signal
There is change.If so, then comparison circuit exports the control signal of enable to driving force control circuit；If it is not, then comparison circuit is defeated
Go out the control signal of forbidden energy to driving force control circuit.
In one embodiment of this invention, above-mentioned components for operational amplifier also includes a D/A conversion circuit.Number
Word analog conversion circuit is coupled to operation amplifier circuit and comparison circuit, to the input signal for receiving numeral.Also, numeral
The input signal of numeral is converted to the input signal of simulation by analog conversion circuit, then is exported the input signal of simulation and put to computing
Big device circuit.Comparison circuit judges whether the highest significant bit of the input signal of numeral has change.If so, then comparison circuit is defeated
Go out the control signal of enable to driving force control circuit；If it is not, then the control signal of comparison circuit output forbidden energy is to driving energy
Power control circuit.
The present invention provides a kind of method of the driving force for strengthening operation amplifier circuit.Operation amplifier circuit includes one
Output-stage circuit.Methods described comprises the steps.Receive an input signal.Judge whether input signal has change.If input
Signal has change, the control signal of an enable is exported to output-stage circuit, to strengthen the driving force of operation amplifier circuit.
In one embodiment of this invention, above-mentioned method is further included during control signal is enable, specific using one
Voltage is strengthening the driving force of operation amplifier circuit.
In one embodiment of this invention, above-mentioned method also comprises the steps.If input signal does not change, output
The control signal of forbidden energy is to output-stage circuit.
In one embodiment of this invention, above-mentioned specific voltage is a system voltage or a ground voltage.
In one embodiment of this invention, it is above-mentioned to judge that the step of whether input signal has change includes judging input
Whether the magnitude of voltage or current value of signal has change.
In one embodiment of this invention, it is above-mentioned to judge that the step of whether input signal has change includes judging input
Whether the highest significant bit of signal has change.
Based on above-mentioned, in the exemplary embodiment of the present invention, when input signal is changed, comparison circuit can export cause
The control signal of energy strengthens the driving force of operation amplifier circuit using specific voltage to output-stage circuit.
It is that the features described above and advantage of the present invention can be become apparent, special embodiment below, and it is detailed to coordinate accompanying drawing to make
Carefully it is described as follows.
Description of the drawings
Fig. 1 illustrates the block schematic diagram of the components for operational amplifier of one embodiment of the invention；
Fig. 2 illustrates the method flow diagram of the driving force of the enhancing operation amplifier circuit of one embodiment of the invention；
Fig. 3 illustrates the internal circuit schematic diagram of the operation amplifier circuit of Fig. 1；
Fig. 4 illustrates that the signal waveform of the input signal, control signal and inverted control signal of one embodiment of the invention is illustrated
Figure；
Fig. 5 illustrates the internal circuit schematic diagram of the operation amplifier circuit of another embodiment of the present invention.
Description of reference numerals：
100：Components for operational amplifier；
110、210：Operation amplifier circuit；
112、212：Input stage circuit；
113、213：Driving force control circuit；
114、214：Output-stage circuit；
115、215：Switch module；
115a、215a：First switch transistor；
115b、215b：Second switch transistor；
120：Comparison circuit；
130：D/A conversion circuit；
Sin1：Digital input signals；
Sin2：Analog input signal；
S：Control signal；
SB：Inverted control signal；
S200、S210、S220：Method and step；
MPO、MNO：First output transistor；
MPO1、MNO1：One or two output transistor；
MP1、MP2、MN1、MN2：Transistor；
CM：Electric capacity；
TDE：Time interval；
A：Time point；
VDDA：System voltage；
VG：Ground voltage；
I1T、I2T：Current source.
Specific embodiment
Fig. 1 illustrates the block schematic diagram of the components for operational amplifier of one embodiment of the invention.Refer to Fig. 1, the present embodiment
Components for operational amplifier 100 include an operation amplifier circuit 110, a comparison circuit 120 and a digital-to-analogue conversion electricity
Road 130.Specifically, in the present embodiment, D/A conversion circuit 130 is coupled to operation amplifier circuit 110 and compares
Circuit 120, to input signal Si n1 for receiving numeral.D/A conversion circuit 130 first turns digital input signals Sin1
After being changed to input signal Si n2 of simulation, then analog input signal Sin2 is exported to operation amplifier circuit 110.
In the present embodiment, operation amplifier circuit 110 is to receive the simulation that D/A conversion circuit 130 is provided
Input signal Si n2, and strengthen the driving force of input signal Si n2.Comparison circuit 120 is coupled to operation amplifier circuit
110 and D/A conversion circuit 130, to receive digital input signals Sin1, and judge that digital input signals Sin1 is
It is no to have change, to decide whether to export control signal S of an enable to operation amplifier circuit 110 strengthening its driving force.
Therefore, the components for operational amplifier 100 of the present embodiment need not pass through breadth length ratio or the increasing for increasing output transistor
Plus the transistor size of institute's layout, you can the enhanced effect of driving force is reached, operation amplifier circuit 110 can be saved in chip
Upper institute's usable floor area.
In the present embodiment, the input signal that components for operational amplifier 100 is received is to be with digital input signals Sin1
Example, thus the object that compared of comparison circuit 120 be, for example, input signal Si n1 before and after two secondary datas highest significant bit
(most significant bits, MSB), this point will be illustrated in after a while.However, the present invention is not limited to this, at other
In embodiment, the object that comparison circuit 120 is compared can also be that previous stage circuit is directly inputted into operation amplifier circuit 110
Analogue signal.Now, comparison circuit 120 is, for example, and judges whether the magnitude of voltage or current value of this analogue signal being input into have to change
Become, to decide whether control signal S for exporting enable to operation amplifier circuit 110.In this kind of enforcement aspect, operation amplifier
Device assembly 100 is not required to need to include D/A conversion circuit 130 that designer can decide whether according to the actual requirements to need
Configure D/A conversion circuit 130.
Beneath explanation comparison circuit 120 judges whether the highest significant bit of digital input signals Sin1 has change to determine
Whether an exemplary embodiment of the driving force of operation amplifier circuit 110 is strengthened.
Fig. 2 illustrates the method flow diagram of the driving force of the enhancing operation amplifier circuit of one embodiment of the invention.Please be same
When refer to Fig. 1 and Fig. 2, in step s 200, comparison circuit 120 first determine whether input signal Si n1 before and after two secondary datas most
Whether high significant bit has change.In the present embodiment, two secondary datas in front and back that the aspect that highest significant bit changes includes
Highest significant bit becomes 1 or 1 change 0 by 0, therefore, once comparison circuit 120 detects the highest significant bit of input signal Si n1
The step of producing change, the method flow process can carry out step S210.In step S210, comparison circuit 120 exports the control of enable
Signal S processed strengthens its driving force to operation amplifier circuit 110.Then, the step of the method flow process can return step
S200, continuation judges whether the highest significant bit of two secondary datas in front and back of input signal Si n1 has change.
On the other hand, in step s 200, if comparison circuit 120 judges two secondary datas in front and back of input signal Si n1 most
High significant bit does not change, then the step of the method flow process can carry out step S220.In step S220, comparison circuit 120
Control signal S of forbidden energy is exported to operation amplifier circuit 110, now because the highest significant bit of input signal Si n1 does not have
Change, therefore operation amplifier circuit 110 is in general operation pattern, its driving force is without the need for adjustment.Then, the step of the method
Rapid flow process can return step S200, and continuation judges whether the highest significant bit in front and back twice of input signal Si n1 has and changes
Become.
In simple terms, whether the method first determines whether the highest significant bit of the fan-in evidence of components for operational amplifier 100
Change.It is not the operation for not carrying out strengthening driving force if being judged as；If being judged as YES, the control letter of enable is exported
Number S is transferred to operation amplifier circuit 110 to strengthen its driving force.In addition, in the present embodiment, although comparison circuit 120
Judge pair as if input signal Si n1 highest significant bit, but the present invention is not limited to this, in other embodiments, than
The object judged compared with circuit 120 can be input signal Si n1 before and after numerical data twice arbitrary bit whether determining it
Change.
Fig. 3 illustrates the internal circuit schematic diagram of the operation amplifier circuit of Fig. 1.Fig. 1 and Fig. 3 is refer to, the present embodiment
Operation amplifier circuit 110 includes an input stage circuit 112 and an output-stage circuit 114.Input stage circuit 112 is to receive
Differential input signal AVN, AVP, the analog input signal Sin2 of differential input signal AVN, AVP systems correspondence Fig. 1 herein.Output
Level circuit 114 is coupled to input stage circuit 112, to the driving force for strengthening analog input signal Sin2.
Furthermore, the output-stage circuit 114 of the present embodiment includes that a driving force control circuit 113 and one first is defeated
Go out transistor MPO.Driving force control circuit 113 includes one second output transistor MPO1 and a switch module 115.At this
In embodiment, the second output transistor MPO1 and the first output transistor MPO coupled in parallel, by same current source I2TBiased,
Its size is the current source I of input stage circuit 1121TN times.Switch module 115 is coupled in the grid of the first output transistor MPO
And second output transistor MPO1 grid between, and be controlled by control signal S.Specifically, switch module 115 includes one
A first switch transistor 115a and second switch transistor 115b.It is brilliant that first switch transistor 115a is coupled in the first output
Between the grid of the grid of body pipe MPO and the second output transistor MPO1, it is controlled by control signal S.Second switch transistor
MPO1 is coupled between the grid of the second output transistor MPO1 and specific voltage VG, is controlled by anti-phase control signal SB.This
The specific voltage VG at place is that by taking ground voltage as an example, but the present invention is not limited to this.
From from the perspective of circuit operation, Fig. 4 illustrates the input signal, control signal and anti-phase control of one embodiment of the invention
The signal waveform schematic diagram of signal processed.Fig. 3 and Fig. 4 is refer to, judges to need to strengthen operation amplifier circuit in comparison circuit 120
During 110 driving force, meeting output control signal S carrys out enable switch module 115.During switch module 115 is enabled, immediately
Between interval TDE, in high level state, inverted control signal SB is in low level state for control signal S.Now, first switch is brilliant
To close, to open, the grid of the second output transistor MPO1 is coupled to specific electricity to second switch transistor 115b to body pipe 115a
Pressure VG.Therefore, the grid of the second output transistor MPO1 can be pulled down to ground connection electricity when second switch transistor 115b is opened
Pressure, cause between the source electrode and grid of the second output transistor MPO1 with maximum cross-pressure, and then allow the second output crystal
The equivalent resistance of pipe MPO1 is less because of the relation of pressure reduction, reaches the purpose of the driving force for strengthening operation amplifier circuit 110.This
One feature is also manifested in waveform input signal illustrated in fig. 4.In the diagram, in time interval TDEPeriod, due to the second output
The equivalent resistance very little of transistor MPO1, therefore the speed that input signal Si n2 charges to target voltage can be improved, shorten the time
Interval TDELength, strengthen operation amplifier circuit 110 driving force.
In other words, in the present embodiment, control signal S of enable has high-voltage level, can start driving force
Control circuit 113 carries out the operation of the driving force for strengthening operation amplifier circuit 110.In other embodiments, according to switch
The difference of the embodiment of component 115, control signal S of enable is likely to low voltage level, and the present invention is not any limitation as.
In addition, in the present embodiment, the driving force of enhancing operation amplifier circuit 110 is for example referred to and can improve input signal Si n2
The speed of target voltage is charged to, shortens time interval TDELength.
On the other hand, when comparison circuit 120 judges that the driving force of operation amplifier circuit 110 need not be strengthened, meeting
Output control signal S carrys out forbidden energy switch module 115.Now, control signal S is in low level state, at inverted control signal SB
In high level state.Therefore, to open, to close, second exports second switch transistor 115b first switch transistor 115a
The grid of transistor MPO1 will not be coupled to ground voltage, and be coupled to the grid of the first output transistor MPO, and both are presented
The state of coupled in parallel, and operator scheme is similar to the output transistor of general output-stage circuit.
In other words, in the present embodiment, control signal S of forbidden energy has low voltage level, to make output-stage circuit
114 are in the state that general operator scheme, i.e. output transistor are presented coupled in parallel.In other embodiments, according to switch
The difference of the embodiment of component 115, control signal S of forbidden energy is likely to high-voltage level, and the present invention is not any limitation as.
In summary, control signal S may decide that whether the grid of the second output transistor MPO1 exports crystal with first
The grid of pipe MPO is connected.When the driving force of operation amplifier circuit 110 need not be strengthened, the first output transistor MPO
With both the second output transistor MPO1 coupled in parallel, output transistor of its operator scheme similar to general output-stage circuit.
When needing to strengthen the driving force of operation amplifier circuit 110, the grid of the second output transistor MPO1 can be pulled down to and connect
Ground voltage or lower current potential, to improve the speed that input signal Si n2 charges to target voltage.
In addition, in the present embodiment, the time point of control signal S of the output enable of comparison circuit 120, compared to detecting
The time point that input signal Si n1 changes a, it is understood that there may be time delay.For example, in the present embodiment, comparison circuit 120
For example detect input signal Si n1 in time point A to change, and comparison circuit 120 is late to time interval TDEInitial time
Control signal S of high level is just exported, there is a time delay between the two.In the present embodiment, control signal S high level
Starting time can be counted determining using seasonal pulse, or according to designer's default set time determining.
Additionally, from from the perspective of circuit layout, the first output transistor MPO and the second output transistor MPO1 are in practice
On would generally be realized using the layout type of one or more transistor.For example, the first output transistor MPO is, for example, and adopts
Realized with the layout type of M transistor, the second output transistor MPO1 be, for example, using the layout type of N number of transistor come
Realize, wherein M≤0, N>1.Therefore, in the present embodiment, the enforcement aspect of the second output transistor MPO1 can additionally be existed
The N number of transistor of layout is realizing on chip, or N number of transistor is chosen from the M transistor of the first output transistor MPO
As the second output transistor MPO1, now M>N.
In addition, in the present embodiment, the grid of the second output transistor MPO1 is to be pulled down to ground voltage or lower
Level, but the present invention is not limited to this.In other embodiments, it is coupled to the specific voltage of the grid of the second output transistor
Can also be system voltage VDDA.
Fig. 5 illustrates the internal circuit schematic diagram of the operation amplifier circuit of another embodiment of the present invention.Refer to Fig. 3 and figure
5, the operation amplifier circuit 210 of the present embodiment is only led between the two similar to the operation amplifier circuit 110 described by Fig. 3
It is system voltage VDDA that the difference wanted for example is the specific voltage of the grid for being coupled to the second output transistor MNO1, specifically
It is bright as follows.
In the present embodiment, operation amplifier circuit 210 is adopted in the place of correspondence transistor types and operation amplifier
Device circuit 110 is different.For example, in operation amplifier circuit 210, the Differential Input of input stage circuit 212 is to being to adopt P
The transistor MP1 and MP2 of type implementing, the current mirror MN1 and MN2 of input stage circuit 212 and the first of output-stage circuit 214
Output transistor MNO with the second output transistor MNO1 is implemented using the transistor of N-type, as shown in Figure 5.Comparatively,
In operation amplifier circuit 110, the Differential Input of input stage circuit 112 to being implemented using N-type transistor MN1 and MN2,
The outputs of the current mirror MP1 and MP2 of input stage circuit 112 and the first output transistor MPO of output-stage circuit 114 and second are brilliant
Body pipe MPO1 is implemented using P-type transistor, as shown in Figure 3.In response to the embodiment of different types of transistor, this enforcement
The coupling relation of each element is also adjusted therewith in the operation amplifier circuit 210 of example, as shown in figure 5, will not be described here.Due to
The first output transistor MNO and the second output transistor MNO1 of output-stage circuit 214 is implemented using the transistor of N-type,
Therefore when needing to strengthen the driving force of operation amplifier circuit 210, the second switch transistor 215b meetings of switch module 215
It is unlocked, the grid of the second output transistor MNO1 can be pulled to system voltage VDDA, to improve the charging of input signal Si n2
To the speed of target voltage.
In sum, in the exemplary embodiment of the present invention, comparison circuit judges the letter of input to components for operational amplifier
Number whether there is change, to export the control signal of enable to driving force control circuit.During control signal is enable, drive
Capability control circuit reduces the equivalent resistance of output transistor using the voltage of particular level, to strengthen operation amplifier circuit
Driving force.
Finally it should be noted that：Various embodiments above only to illustrate technical scheme, rather than a limitation；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
So the technical scheme described in foregoing embodiments can be modified, either which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, do not make the essence disengaging various embodiments of the present invention technology of appropriate technical solution
The scope of scheme.
Claims (5)
1. a kind of components for operational amplifier, it is characterised in that include：
One operation amplifier circuit, including：
One input stage circuit, to receive an input signal；And
One output-stage circuit, is coupled to the input stage circuit, to the driving force for strengthening the input signal；And
One comparison circuit, is coupled to the output-stage circuit, to receive the input signal, and judges whether the input signal has
Change, to export the control signal of an enable to the output-stage circuit driving force of the operation amplifier circuit strengthened,
Wherein the output-stage circuit includes a driving force control circuit, is coupled to the comparison circuit, is controlled by the control signal,
During the control signal is enable, the driving force control circuit strengthens the operation amplifier circuit using a specific voltage
Driving force,
Wherein the output-stage circuit also includes one first output transistor, and the driving force control circuit includes：One second output
Transistor, it is in parallel with first output transistor；And a switch module, be coupled in first output transistor grid and should
Between the grid of the second output transistor, it is controlled by the control signal, wherein during the control signal is enable, the switches set
Part strengthens the driving force of the operation amplifier circuit using the specific voltage.
2. components for operational amplifier according to claim 1, it is characterised in that the specific voltage is a system voltage or
Ground voltage.
3. components for operational amplifier according to claim 1, it is characterised in that the switch module includes：
One first switch transistor, be coupled in first output transistor grid and second output transistor grid it
Between, it is controlled by the control signal；And
One second switch transistor, is coupled between the grid of second output transistor and the specific voltage, is controlled by anti-phase
The control signal,
Wherein when first switch transistor is to close, the second switch transistor to open, to allow second output transistor
Grid be coupled to the specific voltage.
4. components for operational amplifier according to claim 1, it is characterised in that the comparison circuit judges the input signal
Whether magnitude of voltage or current value have change, and if so, then the comparison circuit exports the control signal of enable to the driving force control
Circuit processed；If it is not, then the control signal of the comparison circuit output forbidden energy is to the driving force control circuit.
5. components for operational amplifier according to claim 1, it is characterised in that also include：
One D/A conversion circuit, is coupled to the operation amplifier circuit and the comparison circuit, to receive numeral this is defeated
Enter signal, and the input signal of numeral is converted to into the input signal of simulation, then export the input signal of simulation extremely
The operation amplifier circuit,
The wherein comparison circuit judges whether the highest significant bit of the input signal of numeral has change, and if so, then this compares
The control signal of circuit output enable is to the driving force control circuit；If it is not, then the comparison circuit exports the control of forbidden energy
Signal processed is to the driving force control circuit.
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| CN201210387127.4A CN103731109B (en) | 2012-10-12 | 2012-10-12 | Operational amplifier assembly and method for strengthening drive capacity of operational amplifier circuit |
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| CN201210387127.4A CN103731109B (en) | 2012-10-12 | 2012-10-12 | Operational amplifier assembly and method for strengthening drive capacity of operational amplifier circuit |
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| CN112542125A (en) * | 2020-12-14 | 2021-03-23 | 北京奕斯伟计算技术有限公司 | Slew rate enhancement circuit, source driving chip and display device |
| US11462142B2 (en) | 2020-12-14 | 2022-10-04 | Beijing Eswin Computing Technology Co., Ltd. | Slew rate boosting circuit, source driver chip and display device |
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| JP4353759B2 (en) * | 2003-09-22 | 2009-10-28 | Ｎｅｃエレクトロニクス株式会社 | Driving circuit |
| US7420552B2 (en) * | 2004-03-16 | 2008-09-02 | Matsushita Electric Industrial Co., Ltd. | Driving voltage control device |
| TWI299938B (en) * | 2005-03-03 | 2008-08-11 | Novatek Microelectronics Corp | Current driving enhance device and method thereof |
| CN100449449C (en) * | 2006-02-15 | 2009-01-07 | 启攀微电子（上海）有限公司 | Circuit for enhancing driving capability of low voltage-difference linear voltage manostat |
| TW200822023A (en) * | 2006-11-10 | 2008-05-16 | Beyond Innovation Tech Co Ltd | Circuit for adjusting driving ability of output stage and method thereof |
| TWI385616B (en) * | 2006-12-29 | 2013-02-11 | Novatek Microelectronics Corp | Driving apparatus and driving method thereof |
| CN101630944B (en) * | 2008-07-17 | 2012-10-17 | 联咏科技股份有限公司 | Driving circuit capable of promoting response speed and related method thereof |
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