CN102545799B - Adjustable amplification circuit - Google Patents
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- CN102545799B CN102545799B CN201010616245.9A CN201010616245A CN102545799B CN 102545799 B CN102545799 B CN 102545799B CN 201010616245 A CN201010616245 A CN 201010616245A CN 102545799 B CN102545799 B CN 102545799B
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Abstract
The invention discloses an adjustable amplification circuit, which comprises an operational amplifier, a simulation unit and a bias control unit, wherein the operational amplifier comprises a variable bias current source which is used for supplying a variable bias current to the operational amplifier; the simulation unit is used for simulating the operation characteristic of the operational amplifier and converting a simulation input voltage into a simulation output voltage; and the bias control unit is used for generating a bias control signal to the variable bias current source according to the simulation output voltage to adjust the size of the variable bias current.
Description
Technical field
The present invention relates to a kind of amplifying circuit, particularly a kind of adjustable amplification circuit controlling while there is adaptive bias current.
Background technology
Operational amplifier is an important circuit element in various electronic circuit.Circuit designers often can use operational amplifier to realize the different operational function of many kinds.Such as, in the drive circuit of liquid crystal display, operational amplifier can be 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 tertiary structure circuit, mainly comprises an input stage circuit, a gain stage circuit and an output-stage circuit.Input stage circuit is used for improving the input impedance of operational amplifier, and gain stage 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, existing operational amplifier can carry out frequency compensation, to reach the effect of stable loop by miller-compensated (Miller Compensation) electric capacity.In addition, in order to promote external loading, the drive current of output-stage circuit can be greater than the bias current of input stage circuit usually; thus; when existing operational amplifier is when driving heavy duty, the bias current that slew rate is often transfused to grade circuit affected, and driving force is restricted.
In general, 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.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 the reaction speed of operational amplifier is also faster.Therefore, prior art by increasing the bias current of input stage circuit, can promote the slew rate of operational amplifier inside, to accelerate operational amplifier actuating speed usually.
Further illustrate, prior art is mainly when operational amplifier operates at every turn, and the fixing size strengthening its bias current within a fixing period, to accelerate the reaction speed of operational amplifier.But, due to the impact that technique, voltage and temperature (being called for short PVT) change, when practical application, same operational amplifier in different operating environments, operational amplifiers different even, the degree that its slew rate promotes non-equal.In the case, strengthen the mode of bias current in this fixing period, many problems can be caused.
For example, for the operational amplifier that internal capacitance is relatively little, even if internal capacitance has stored enough electric charges, bias current through strengthening still can be continued to be provided to operational amplifier, and making the void of the bias current through strengthening consumption terminate to fixing period on foot, result consumes much extra power, for quite unfavorable the electronic installation needing power saving.Relatively, for the operational amplifier that internal capacitance is larger, if only provide the reinforcement bias current of fixing period, but can because of enough electric charges cannot be provided, make slew rate promote poor effect, result is instead to the phenomenon causing driving force deficiency.
In sum, prior art, by strengthening bias current within fixing period, promotes the mode of slew rate, in fact cannot do suitable operation adjustment in response to different operating environments and device demand.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of adjustable amplification circuit, and it can adjust the size of bias current with adjusting, and improves even can reach optimization to make integral systematicness.
For solving the problems of the technologies described above, according to an aspect of the present invention, providing a kind of adjustable amplification circuit, comprising an operational amplifier, a simulation unit and a bias control unit.This operational amplifier comprises a variable bias current source, in order to provide a variable bias electric current for this operational amplifier.One emulation input voltage in order to emulate an operating characteristic of this operational amplifier, and is converted to a simulation data voltage by this simulation unit.This bias control unit is used for producing a bias voltage control signal to this variable bias current source, to adjust the size of this variable bias electric current according to this simulation data voltage.
According to a further aspect in the invention, provide a kind of adjustable amplification circuit, comprise an operational amplifier, a simulation unit and a bias control unit.This operational amplifier comprises a variable bias current source, in order to provide a variable bias electric current for this operational amplifier.One emulation input voltage in order to emulate at least one in the middle of a charge characteristic of this operational amplifier and a flash-over characteristic, and is converted to a simulation data voltage by this simulation unit.This bias control unit comprises a reference voltage generation unit, a comparator and a bias voltage generation unit.This reference voltage generation unit is used for generation one reference voltage.This comparator is used for comparing this simulation data voltage and this reference voltage, to produce a comparison signal.This bias voltage generation unit is used for according to this comparison signal, produces a bias voltage control signal to this variable bias electric current, to adjust the size of this variable bias electric current.
Amplifying circuit of the present invention provides the assessment foundation of operational amplifier charge inside or discharged condition by the running of simulation unit, and can suitably manipulate in response to the change of the type of operational amplifier and operating environment the bias current being supplied to operational amplifier, therefore, after the advantage reaching slew rate lifting, electric charge can be utilized appositely again, do not consume unnecessary power, and can solve the hypodynamic problem of driving kinetic energy, result entire system performance can reach improvement or optimization.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an amplifying circuit of the embodiment of the present invention.
Fig. 2 A and 2B is respectively an embodiment schematic diagram of the simulation unit in Fig. 1.
Fig. 3 A and 3B is respectively an embodiment schematic diagram of the first Voltage-current conversion circuit in Fig. 2 A and 2B.
Fig. 4 is an embodiment schematic diagram of the reference voltage generation unit in Fig. 1.
Fig. 5 is an embodiment schematic diagram of the bias voltage generation unit in Fig. 1.
Wherein, description of reference numerals is as follows:
10 amplifying circuits
102 simulation unit
104 bias control units
106 operational amplifiers
108 variable bias current sources
110 reference voltage generation units
112 comparators
114 bias voltage generation units
202, the 202 ' first Voltage-current conversion circuit
402 voltage generators
404 multiplexers
502 second voltages turn current unit
504 current operating unit
506 bias control circuits
CS, CS ' artificial capacitor
I1, I1 ' first electric current
I2 second electric current
IP operation current
IS variable bias electric current
SC comparison signal
SD data comparison signal
SIC bias voltage control signal
V1 ~ Vn predetermined reference voltage
VI input voltage
VI ' emulates input voltage
VR reference voltage
VS simulation data voltage
Embodiment
Please refer to Fig. 1, Fig. 1 is the schematic diagram of an amplifying circuit 10 of the embodiment of the present invention.Amplifying circuit 10 comprises simulation unit 102, bias control unit 104 and an operational amplifier 106.Wherein operational amplifier 106 comprises a variable bias current source 108, in order to provide a variable bias current IS for operational amplifier 106.This variable bias current IS can at different levels for operational amplifier 106, preferably at least flow through an input stage of operational amplifier 106.Operational amplifier 106 can be the operational amplifier of any type, such as is a track to track (Rail-to-rail) amplifier, but not as limit.Simulation unit 102 and bias control unit 104 can co-operations, with for the type of operational amplifier 106 and the operating environment applied, flexibly bestow the preferred or even optimized bias voltage of variable bias current source 108.
In specific words, simulation unit 102 is a precircuit or the equivalent electric circuit of operational amplifier 106, and this precircuit can simulate the operating characteristic of operational amplifier 106.Simulation unit 102 is configurable receives an emulation input voltage VI ', and will emulate input voltage VI ' and be converted to a simulation data voltage VS.Preferably, at least one in the middle of simulation unit 102 simulation calculating amplifier 106 charge characteristic and flash-over characteristic, so simulation data voltage VS can reflect the operational circumstances of operational amplifier 106 in charge or discharge.
Bias control unit 104 configurations receive simulation data voltage VS, and produce a bias voltage control signal SIC according to this to this variable bias current source 108, to adjust the size of this variable bias current IS.Preferably, bias control unit 104 simultaneously can decide bias voltage control signal SIC according to the level of simulation data voltage VS and a reference voltage VR.The level of this reference voltage VR depends on the operating environment that operational amplifier 106 is applied, such as is decide according to the one or more voltage nodes in the load device (not shown) that operational amplifier 106 drives.Because the level of simulation data voltage VS and the level of reference voltage VR reflect the electrical operating environment with applying of the operation of operational amplifier 106 itself respectively, bias control unit 104, therefore, it is possible to according to the operant response of operational amplifier 106 under applied operating environment, adjusted for the bias current being supplied to operational amplifier 106.
It should be noted that the size of emulation input voltage VI ' preferably equals the input voltage VI size of operational amplifier 106, but not as limit.The emulation input voltage VI ' that different simulation unit 102 and bias control unit 104 can be arranged in pairs or groups different operates.As long as received emulation input voltage VI ' can be converted to suitable simulation data voltage VS to simulate the operation of operational amplifier 106 electrically by simulation unit 102.
Fig. 1 also demonstrates a preferred embodiment of a thin portion structure of bias control unit 104.In this embodiment, bias control unit 104 is configured to the level of simulation data voltage VS to compare with reference voltage VR, to produce bias voltage control signal SIC according to comparative result.As shown in the figure, bias control unit 104 comprises reference voltage generation unit 110, comparator 112, bias voltage generation unit 114.
Reference voltage generation unit 110 is used for generation one reference voltage VR, this reference voltage VR preferably can reflect the operating environment that amplifying circuit 100 is applied, can be for example the level reached set by the output voltage of operational amplifier 106, or can according to its level of the incompatible setting of the applied field of amplifying circuit 10.In other words, the level value of reference voltage VR normally can be depending on any single or multiple electrical voltage point in a load device (not shown) that operational amplifier 106 drives, such as power electric pressure point or any system applied voltage point.
Comparator 112 is used for comparing simulation data voltage VS and reference voltage VR, to produce a comparison signal SC.For example, as shown in Figure 1, comparator comprises a first input end, is used for receiving simulation data voltage VS, one second input, is used for receiving reference voltage VR, and one first output, is used for exporting comparison signal SC.Finally, bias voltage generation unit 114 can be used to according to comparison signal SC, produces a bias voltage control signal SIC to operational amplifier 106, to adjust the size of variable bias current IS.
In a preferred embodiment, when simulation data voltage VS is less than reference voltage VR, bias voltage generation unit 114 produces corresponding bias voltage control signal SIC according to comparison signal SC, makes variable bias current source 108 increase the size of variable bias current IS according to this.Otherwise when simulation data voltage VS is greater than reference voltage VR, bias voltage generation unit 114 produces corresponding bias voltage control signal SIC, variable bias current source 108 is made to reduce the size of variable bias current IS according to this.Thus, bias voltage generation unit 114 can when needing the circuit reaction speed promoting operational amplifier 106, positively promote the size of variable bias current IS, and when no longer needing the circuit reaction speed promoting operational amplifier 106, in time reduce the size of variable bias current IS, thus avoid unnecessary current power consumption.It is noted that, aforesaid way is only a preferred embodiment, and bias voltage generation unit 114 can be not limited thereto on designing.Various foundation comparison signal SC all can implement in the mode adjusting variable bias current IS, also continous way adjustment or stage adjustment etc. can be adopted, as long as bias voltage generation unit 114 is according to comparison signal SC, the size of variable bias current source 108 suitably variable bias current IS can be controlled.
Via above-mentioned configuration, amplifying circuit 10 produces simulation data voltage VS to comparator 112 by simulation unit 102, and then according to the comparative result of comparator 112, makes bias voltage generation unit 114 control to be provided to the bias current size of operational amplifier 106.As a result, amplifying circuit 10 can suitably manipulate in response to the type of operational amplifier 106 and operating environment the bias current being supplied to operational amplifier.
It is the bias current asked slew rate lifting and strengthen operational amplifier blindly within the set time compared to prior art, so that generation driving force is not enough or the problem that power consumption is too high, embodiment shown in Fig. 1 passes through simulation calculating amplifier 106 charge characteristic corresponding under different application or flash-over characteristic, suitably to adjust the bias current of operational amplifier in response to various operating conditions, therefore after the object reaching slew rate lifting, the problem that driving force is not enough or power consumption is excessive of prior art can be solved again.
It should be noted that the thin portion structure of the bias control unit 104 shown in Fig. 1 is only a preferred embodiment.In other embodiments, different circuit structures can be utilized, also can realize the effect simultaneously suitably producing bias voltage control signal according to this simulation data voltage and this reference voltage.
Further illustrate, please refer to Fig. 2 A, Fig. 2 A is an embodiment schematic diagram of the simulation unit 102 in Fig. 1, and wherein simulation unit 102 is mainly used in the charge characteristic of simulation calculating amplifier 106.Simulation unit 102 is containing one first Voltage-current conversion circuit 202 and an artificial capacitor CS.First Voltage-current conversion circuit 202 is used for converting emulation input voltage VI ' to one first electric current I 1.For example, please refer to Fig. 3 A, Fig. 3 A is an embodiment schematic diagram of the first Voltage-current conversion circuit 202 in Fig. 2 A.As shown in Figure 3A, the first Voltage-current conversion circuit 202 can be realized by a transistor M, such as is P type metal-oxide half field effect transistor, and its drain electrode, source electrode are respectively coupled to a power end VCC and artificial capacitor CS.Thus, after emulation input voltage VI ' is biased in the grid of transistor M, the first electric current I 1 produced can provide artificial capacitor CS to charge.Please continue to refer to Fig. 2 A, artificial capacitor CS comprises a first end, be coupled to the first Voltage-current conversion circuit 202 and comparator 112, and one second end, be coupled to reference potential end VSS, in the case, artificial capacitor CS charges by the first electric current I 1, and produces the first input end of simulation data voltage VS to comparator 112.In other words, when the first electric current I 1 couple of artificial capacitor CS charges, simulation data voltage VS can rise gradually, until artificial capacitor CS has stored enough electric charges.
Preferably, in simulation unit 102, the capacitance of artificial capacitor CS equals the equivalent capacitance value size of the internal capacitance of operational amplifier 106.In the case, if simulation unit 102 and operational amplifier 106 all operate via identical bias voltage size, the then charging operations that carries out of the first electric current I 1 couple of artificial capacitor CS, also the associative operation that operational amplifier 106 carries out is equivalent to, emulation respective operations when also namely the running identity of operation amplifier 106 of simulation unit 102 charges to its internal capacitance.Therefore, the running of simulation unit 102, can be used as the assessment foundation of operational amplifier 106 charge inside situation.
It is noted that, in other embodiments, the capacitance of artificial capacitor CS also can consider load capacitance value or all the other external capacitive values again.What is more, the capacitance of artificial capacitor CS can possess any capacitance, as long as the charge-discharge characteristic of this capacitance can simulate charging and/or the flash-over characteristic of operational amplifier 106.
Below by the case structure for the simulation unit 102 shown in Fig. 2 A and 3A, the practical operation situation of amplifying circuit 10 is described.When practical operation, when the first electric current I 1 couple of artificial capacitor CS charges, the level of simulation data voltage VS will rise gradually.During simulation data voltage VS changes level gradually, if when simulation data voltage VS is less than reference voltage VR, bias voltage generation unit 114 can according to comparison signal SC, corresponding bias voltage control signal SIC can be produced, make variable bias current source 108 promote the size of variable bias current IS according to this to operational amplifier 106; Otherwise when simulation data voltage VS is greater than reference voltage VR, bias voltage generation unit 114 can produce corresponding bias voltage control signal SIC, variable bias current source 108 is made to reduce the size of variable bias current IS according to this to operational amplifier 106.In other words, by the running of simulation unit 102, the operant response of monitoring operational amplifier 106 can be emulated.And then the operation of collaborative comparator 112, just can really according to the state of operational amplifier 106, the supply of Dynamic controlling bias current.Result can grasp the adjustment opportunity of the bias current of operational amplifier 106 exactly.
It should be noted that the embodiment shown in Fig. 2 A and Fig. 3 A is for the charge characteristic of simulation unit 102 simulation calculating amplifier 106, but class can be pushed into other embodiment emulating flash-over characteristic.For example please refer to Fig. 2 B and 3B, wherein simulation unit 102 changes the flash-over characteristic of simulation calculating amplifier 106 into.Similarly, simulation unit 102 is containing one first Voltage-current conversion circuit 202 ' and an artificial capacitor CS '.First Voltage-current conversion circuit 202 ' is used for converting emulation input voltage VI ' to one first electric current I 1 ', such as can realize by the transistor M ' (can be N-type metal-oxide half field effect transistor) shown in the embodiment of Fig. 3 B.Artificial capacitor CS ' is then coupled between the first Voltage-current conversion circuit 202 ' and reference potential end VDD, to be charged by the first electric current I 1 ', and produces simulation data voltage VS.Much more no longer all the other details can be analogized by the details of Fig. 2 A and Fig. 3 A, to repeat at this.
In addition, also it is noted that, the embodiment of Fig. 2 A-2B and Fig. 3 A-3B illustrates containing one first Voltage-current conversion circuit and an artificial capacitor with simulation unit 102.But in other embodiments, simulation unit 102 also can be a same or analogous entity circuit with operational amplifier 106, or possesses the equivalent electric circuit of identical or similar charge/discharge characteristics with operational amplifier 106.In addition, simulation unit 102 even can add load capacitance or other external capacitive again.What is more, simulation unit 102 can for simulating the circuit of any structure of the charge/discharge situation of operational amplifier 106.Comprehensive speech it, as long as simulation unit 102 can simulate operational amplifier 106 as charging and/or electric discharge and so on electrical property feature.In addition, the first Voltage-current conversion circuit 202 in Fig. 2 A and 2B is except can except transistor version as shown in figs 3 a and 3b realizes, also can use more multiple transistor, or the bias current source of all the other types any, or anyly voltage signal formal transformation can be become the device of current signal form to realize.
Please refer to Fig. 4, Fig. 4 is an embodiment schematic diagram of the reference voltage generation unit 110 in Fig. 1.In this embodiment, reference voltage generation unit 110 can adjust the level value of reference voltage VR according to a data comparison signal SD.As shown in Figure 4, reference voltage generation unit 110 comprises voltage generator 402 and a multiplexer 404.Voltage generator 402 is used for producing predetermined reference voltage V1 ~ Vn (wherein n is a positive integer).Multiplexer 404 is used for according to data comparison signal SD, selects reference voltage VR, to be provided to comparator 112 by switching in predetermined reference voltage V1 ~ Vn.
The level value of predetermined reference voltage V1 ~ Vn can determine according to the operating environment of amplifying circuit 10, such as can be depending on the one or more electrical voltage points in a load device that operational amplifier 106 drives.For example, in the occasion being applied to liquid crystal indicator, predetermined reference voltage V1 ~ Vn can be respectively the gamma voltage corresponding to specific grey-scale in liquid crystal indicator.Because each shown GTG of each pixel corresponds to the GTG of view data, in the case, for each pixel, the data controlling signal that the time schedule controller that data comparison signal SD is liquid crystal indicator exports.Therefore, voltage generator 402 can according to data comparison signal SD, switches and selects corresponding predetermined reference voltage VR as the reference voltage, and selected to the magnitude of voltage size of predetermined reference voltage namely equal this pixel institute for showing the gamma voltage value of GTG.
In addition, the adjustment of reference voltage VR more can decide according to different designing requirements, to reach comparatively rough or comparatively meticulous adjustment to the driving force of operational amplifier 106 opportunity.In an embodiment adjusted roughly, consider that the gal code voltage of inhomogeneity liquid crystal indicator has a particular range, therefore can design and only just select a reference voltage for same liquid crystal indicator.In the embodiment of another intense adjustment, the gal code magnitude of voltage of the pixel of same display floater is dynamic change, therefore dynamically, in real time selects different reference voltage VR for same liquid crystal indicator.Thus, reference voltage generation unit 110 can go out the most appropriate reference voltage VR by modulation.
It should be noted that the circuit structure shown in Fig. 4 is only an embodiment, but have other all different circuit structure all to can be used to realize reference voltage generation unit 110.Usually the associated voltage point data of a load device that drives according to operational amplifier 106 of design reference voltage generating unit 110 level of reference voltage VR can be adjusted.
Please refer to Fig. 5, Fig. 5 is an embodiment schematic diagram of the bias voltage generation unit 114 in Fig. 1.Bias voltage generation unit 114 comprises one second voltage and turns current unit 502, current operating unit 504 and a bias control circuit 506.Second voltage turns current unit 502 and is used for converting comparison signal SC to one second electric current I 2.The bias current source that second Voltage-current conversion circuit 202 can be made up of one or more transistor, or the bias current source of all the other types any, or anyly voltage signal formal transformation can be become the device of current signal form to realize.Current operating unit 504 is used for according to the second electric current I 2, and computing produces an operation current IP.Current operating unit 504 is preferably a current mirroring circuit, be used for by the second electric current I 2 is carried out mirror image, with or without weight addition, subtract each other, electric current synthesis or other relevant current operator process, but not as limit.Bias control circuit 506 is used for according to operation current IP, produces bias voltage control signal SIC.
Under this arrangement, when simulation data voltage VS is less than reference voltage VR, the second voltage turns after current unit 502 converts the comparison signal SC of voltage form to second electric current I 2, and current operating unit 504 is again according to the second electric current I 2, and computing produces operation current IP.Bias control circuit 506 produces bias voltage control signal SIC more according to this, to increase the size of variable bias current IS.Similarly, when simulation data voltage VS is greater than reference voltage VR, bias control circuit 506 produces corresponding bias voltage control signal SIC, to reduce the size of variable bias current IS.
The bias voltage generation unit 114 that it should be noted that Fig. 5 is only the embodiment being described purposes, and is not limited thereto.For example, in other embodiments, bias control circuit 506 also can be a part for variable bias current source 108.That is, bias control circuit 506 is realized by variable bias current source 108, and bias voltage generation unit 114 only comprises the second voltage and turns current unit 502 and current operating unit 504.For example, if current operating unit 504 is embodied as a current mirroring circuit, and be coupled to variable bias current source 108, also namely present the relation of current mirror between the two, then operation current IP can be directly copied to variable bias current source 108 to change the size of variable bias current IS.In other more embodiment, various dissimilar circuit can be utilized to implement bias voltage generation unit 114, as long as the comparison signal SC that bias voltage generation unit 114 can produce according to comparator 112 produces the bias voltage control signal SIC that can be used for controlling variable bias current source 108.
In sum, the amplifying circuit 10 of above-described embodiment provides the assessment foundation of operational amplifier 106 charge inside or discharged condition by the running of simulation unit 102, and can suitably manipulate in response to the change of the type of operational amplifier 106 and operating environment the bias current being supplied to operational amplifier 106.In other words, the occasion that above-described embodiment can coordinate operational amplifier to apply, can adjust the supply of the bias current of operational amplifier 106 with adjusting.Thus, after the advantage reaching slew rate lifting, can utilize electric charge appositely again, not consume unnecessary power, and can solve the hypodynamic problem of driving kinetic energy, result entire system performance can reach improvement or optimization.
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 (14)
1. an adjustable amplification circuit, comprises:
One operational amplifier, it comprises a variable bias current source, in order to provide a variable bias electric current for this operational amplifier;
One simulation unit, it is in order to emulate an operating characteristic of this operational amplifier, and an emulation input voltage is converted to a simulation data voltage, and this simulation unit comprises:
One first Voltage-current conversion circuit, is used for converting this emulation input voltage to one first electric current;
And
One artificial capacitor, is coupled between this first Voltage-current conversion circuit and a reference potential end, for generation of this simulation data voltage; And
One bias control unit, is used for producing a bias voltage control signal to this variable bias current source according to this simulation data voltage, to adjust the size of this variable bias electric current, and this bias control unit
Comprise:
One reference voltage generation unit, is used for generation one reference voltage;
One comparator, is used for comparing this simulation data voltage and this reference voltage, to produce a comparison signal; And
One bias voltage generation unit, is used for according to this comparison signal, produces this bias voltage control signal to this variable bias current source, to adjust the size of this variable bias electric current.
2. adjustable amplification circuit as claimed in claim 1, is characterized in that, this operating characteristic of this operational amplifier comprises at least one in the middle of a charge characteristic and a flash-over characteristic.
3. adjustable amplification circuit as claimed in claim 1, it is characterized in that, this simulation unit comprises one of an equivalent electric circuit and an entity circuit of this operational amplifier.
4. adjustable amplification circuit as claimed in claim 1, it is characterized in that, the capacitance of this artificial capacitor equals in fact the equivalent capacitance value of the internal capacitance of this operational amplifier.
5. adjustable amplification circuit as claimed in claim 1, it is characterized in that, this bias control unit produces this bias voltage control signal according to a reference voltage, and wherein this reference voltage depends at least one voltage node in the load device that this operational amplifier drives.
6. adjustable amplification circuit as claimed in claim 1, is characterized in that, this reference voltage generation unit produces the reference voltage of varying level according to a data comparison signal.
7. adjustable amplification circuit as claimed in claim 1, it is characterized in that, this reference voltage generation unit comprises:
One voltage generator, is used for producing multiple predetermined reference voltage; And
One multiplexer, is used for according to a data comparison signal, selects this reference voltage by switching in the plurality of predetermined reference voltage.
8. adjustable amplification circuit as claimed in claim 7, it is characterized in that, the plurality of predetermined reference voltage is respectively the gamma voltage of a liquid crystal indicator.
9. adjustable amplification circuit as claimed in claim 1, it is characterized in that, when this simulation data voltage is less than this reference voltage, this this comparison signal of bias voltage generation unit produces this bias voltage control signal to increase this variable bias electric current.
10. adjustable amplification circuit as claimed in claim 1, it is characterized in that, when this simulation data voltage is greater than this reference voltage, this this comparison signal of bias voltage generation unit produces this bias voltage control signal to reduce this variable bias electric current.
11. adjustable amplification circuits as claimed in claim 1, it is characterized in that, this bias voltage generation unit comprises:
One second voltage turns current unit, is used for this comparison signal being converted to one second electric current;
One current operating unit, be used for according to this second electric current, computing produces an operation current; And
One bias control circuit, is used for, according to this operation current, producing this bias voltage control signal.
12. adjustable amplification circuits as claimed in claim 1, it is characterized in that, this bias voltage generation unit comprises:
One second voltage turns current unit, is used for this comparison signal being converted to one second electric current; And
One current operating unit, be used for according to this second electric current, computing produces an operation current and this bias voltage control signal.
13. 1 kinds of adjustable amplification circuits, comprise:
One operational amplifier, it comprises a variable bias current source, in order to provide a variable bias electric current for this operational amplifier;
One simulation unit, an emulation input voltage in order to emulate at least one in the middle of a flash-over characteristic of this operational amplifier and a charge characteristic, and is converted to a simulation data voltage by it, comprises:
One first Voltage-current conversion circuit, is used for converting this emulation input voltage to one first electric current;
And
One artificial capacitor, is coupled between this first Voltage-current conversion circuit and a reference potential end, for generation of this simulation data voltage; And
One bias control unit, comprises:
One reference voltage generation unit, is used for generation one reference voltage;
One comparator, is used for comparing this simulation data voltage and this reference voltage, to produce a comparison signal; And
One bias voltage generation unit, is used for according to this comparison signal, produces a bias voltage control signal to this variable bias current source, to adjust the size of this variable bias electric current.
14. adjustable amplification circuits as claimed in claim 13, it is characterized in that, this bias voltage generation unit comprises:
One second voltage turns current unit, is used for this comparison signal being converted to one second electric current;
One current operating unit, be used for according to this second electric current, computing produces an operation current, and wherein this bias voltage control signal produces according to this operation current.
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| US8912849B2 (en) * | 2013-04-30 | 2014-12-16 | Mstar Semiconductor, Inc. | Adaptive operational amplifier bias current |
| DE102014111675A1 (en) * | 2014-08-15 | 2016-02-18 | Dspace Digital Signal Processing And Control Engineering Gmbh | Simulation device and method for simulating a connectable to a control device peripheral circuitry |
| TWI710223B (en) * | 2019-07-15 | 2020-11-11 | 立積電子股份有限公司 | Radio frequency signal transmission circuit |
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| US6339361B1 (en) * | 1999-06-09 | 2002-01-15 | Conexant Systems, Inc. | Power amplifier driver system for wireless handset |
| CN1422455A (en) * | 2000-03-31 | 2003-06-04 | 株式会社日立制作所 | Power amplifier module |
| CN1848018A (en) * | 2005-04-15 | 2006-10-18 | 矽创电子股份有限公司 | Fast restoring low voltage drop linear voltage stabilizer |
| CN101527569A (en) * | 2008-03-06 | 2009-09-09 | 瑞昱半导体股份有限公司 | Digital to analog converter |
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