CN107819444A - Voltage signal amplifying circuit - Google Patents
Voltage signal amplifying circuit Download PDFInfo
- Publication number
- CN107819444A CN107819444A CN201710985780.3A CN201710985780A CN107819444A CN 107819444 A CN107819444 A CN 107819444A CN 201710985780 A CN201710985780 A CN 201710985780A CN 107819444 A CN107819444 A CN 107819444A
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- voltage
- resistance
- module
- electrically connected
- operational amplifier
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
Abstract
A kind of voltage signal amplifying circuit, including：For inputting the base source voltage input module of base source voltage；Offset voltage input module for input offset voltage；The voltage superposition module being electrically connected with base source voltage input module and offset voltage input module, voltage superposition module are used to base source voltage and offset voltage is superimposed to and exported superimposed voltage；And the biasing amplification module being electrically connected with voltage superposition module, the superimposed voltage of biasing amplification module receiving voltage laminating module output and the ac voltage signal of preposition DAC module output, and biasing enhanced processing is done to ac voltage signal；The ac voltage signal of DAC module output is biasing non-zero ac voltage signal, and the offset voltage of offset voltage input module input is used for the DC offset voltage for compensating the ac voltage signal of preposition DAC module output.The voltage of the voltage signal amplifying circuit output of the present invention meets theoretical value.
Description
Technical field
The present invention relates to liquid crystal display panel technical field, more particularly to a kind of voltage signal amplifying circuit, for preceding
The ac voltage signal for putting DAC module input is amplified, to drive liquid crystal panel to work.
Background technology
Liquid crystal display has the characteristics that profile is frivolous, power consumption is few and radiationless pollution in recent years, by widely
Apply on the portable information products such as notebook computer, personal digital assistant (PDA), wherein, liquid crystal display mainly includes
Liquid crystal panel and the drive device of driving liquid crystal display panel work.Drive device includes preposition DAC module (digital-to-analogue conversion mould
Block), the voltage signal of preposition DAC module generation will be conducted to the electrode of the CF sides of liquid crystal panel after treatment, for liquid
The width function of crystal panel.
Preposition DAC module includes 6 locative preposition DAC modules, 7 locative preposition DAC modules, 8 preposition DAC modules and 12 preposition DAC
Module etc..The digit of preposition DAC module is higher, and the voltage range of preposition DAC module output is lower, that is, the voltage exported is got over
Small, the voltage range of the lower preposition DAC outputs of digit is bigger, that is, the voltage exported is bigger.The preposition DAC of different numerical digits
Module can influence the effect of the narrow viewing angle of liquid crystal panel, and numerical digit number is higher, and the change of the drive waveforms under narrow viewing angle will be more flat
Sliding, the effect of narrow viewing angle will be better, and the preposition DAC module of low order bit can produce obvious ladder in output AC voltage
Formula is excessive, and this is unfavorable for the effect of narrow viewing angle；The higher preposition DAC module of digit does not reach because its output voltage range is small
Job requirement on the electrode of the CF sides of liquid crystal panel, display effect are also bad.
The content of the invention
It is an object of the invention to provide a kind of voltage signal amplifying circuit, can export the feedback electricity small with theoretical difference
Signal is pressed, the circuit is applied in a liquid crystal display, the alternating voltage exported to the preposition DAC module of seniority top digit low-voltage output
Signal is amplified, and in order to the preposition DAC module application by seniority top digit is capable of in a liquid crystal display, lifts liquid crystal display
Display effect.
A kind of voltage signal amplifying circuit provided in an embodiment of the present invention, including：
For inputting the base source voltage input module of base source voltage；
Offset voltage input module for input offset voltage；
The voltage superposition module being electrically connected with base source voltage input module and the offset voltage input module, institute
Voltage superposition module is stated to be used to base source voltage and offset voltage is superimposed to and exported superimposed voltage；And
The biasing amplification module being electrically connected with the voltage superposition module, the biasing amplification module receive the voltage
The superimposed voltage of laminating module output and the ac voltage signal of preposition DAC module output, and the ac voltage signal is done
Bias enhanced processing；
The ac voltage signal of the DAC module output is biasing non-zero ac voltage signal, the offset voltage input
The offset voltage of module input is used for the DC offset voltage for compensating the ac voltage signal of the preposition DAC module output.
Further, the biasing amplification module includes operational amplifier U1 and resistance R1, R2, R3, R4, the resistance R1
One end and resistance R2 inverting input of the one end with the operational amplifier U1 be electrically connected with, the resistance R1's
The other end is electrically connected with the preposition DAC module, the output end of the other end of the resistance R2 and the operational amplifier U1
It is electrically connected with, one end of the resistance R3 and one end of the resistance R4 are electric with the in-phase input end of the operational amplifier U1
Property connection, the other end of the resistance R3 and the voltage superposition module be electrically connected with, the other end ground connection of the resistance R4.
Further, the voltage superposition module includes operational amplifier U2 and resistance R5, R6, R7, R8, R9, the electricity
Hinder one end of R5 one end, one end of the resistance R6 and the resistance R7 with the homophase input with the operational amplifier U2
End is electrically connected with, and the other end and the base source voltage input module of the resistance R5 are electrically connected with, and the resistance R6's is another
End is electrically connected with the offset voltage input module, the other end ground connection of the resistance R7；One end of the resistance R8 and institute
Resistance R9 one end is stated with being electrically connected with the inverting input of the operational amplifier U2, another termination of the resistance R8
Ground, the output end of the other end of the resistance R9 and the operational amplifier U2 are electrically connected with, and the operational amplifier U2's is defeated
Go out end and the other end of the resistance R3 is electrically connected with.
Further, base source voltage input module includes operational amplifier U3 and base source voltage source V1, the computing
Amplifier U3 in-phase input end connects with the base source voltage source V1, inverting input and the fortune of the operational amplifier U3
The output end for calculating amplifier U3 is electrically connected with, and the output end of the operational amplifier U3 and the other end of the resistance R5 electrically connect
Connect.
Further, the offset voltage input module includes operational amplifier U4, resistance R10, resistance R11, voltage source
V2 and voltage source V3, wherein, one end of the resistance R10 and the resistance R11 one end are with the operational amplifier U4's
In-phase input end is electrically connected with, one of in the other end of the resistance R10 and the resistance R11 other end and voltage
Source V3 is electrically connected with, and another is electrically connected with the voltage source V2；The operational amplifier U4's is anti-phase to input and institute
The output end for stating operational amplifier U4 is electrically connected with, the output end of the operational amplifier U4 and the other end electricity of the resistance R6
Property connection；The voltage source V2 and voltage source V3 is after the resistance R10 and the resistance R11 partial pressures, to the computing
The voltage that amplifier U4 in-phase input end provides is positive voltage.
Further, the other end of the resistance R11 is electrically connected with the voltage source V2, and the resistance R10's is another
End is electrically connected with the voltage source V3.
Further, the other end of the resistance R11 is electrically connected with the voltage source V3, and the resistance R10's is another
End is electrically connected with the voltage source V2.
Further, the offset voltage input module is programmable voltage generator, the offset voltage input module
It is electrically connected with the in-phase input end of the operational amplifier U4, the in-phase input end for the operational amplifier U4 provides positive electricity
Pressure, the anti-phase of the operational amplifier U4 are electrically connected with to input and the operational amplifier U4 output end, the resistance
The output end of the R6 other end and the operational amplifier U4 is electrically connected with.
Further, R2/R1 value is 2.
The voltage signal amplifying circuit of invention is defeated by base source voltage input module and offset voltage by voltage superposition module
Enter the direct-current working volts DC as biasing amplification module after the output voltage superposition of module, bias amplification module by preposition DAC
The pending voltage signal of module input simultaneously exports feedback voltage signal, the feedback voltage signal precision exported after treatment
The high feedback voltage with theoretical output meets theoretical value.
Brief description of the drawings
Fig. 1 is the theory diagram of the voltage signal amplifying circuit of the present invention.
Fig. 2 is the circuit diagram of the voltage signal amplifying circuit of the present invention.
Embodiment
Further to illustrate the present invention to reach technical approach and effect that predetermined goal of the invention is taken, below in conjunction with
Drawings and Examples, to embodiment, structure, feature and its effect of the present invention, describe in detail as after.
Fig. 1 and Fig. 2 are referred to, the embodiment of the present invention provides a kind of voltage signal amplifying circuit, including base source control source
Module 1, offset voltage input module 2, voltage superposition module 3 and biasing amplification module 4.Wherein, base source voltage input module 1 is used
In input base source voltage, offset voltage input module 2 is used for input offset voltage, voltage superposition module 3 and base source control source
Module 1 and offset voltage input module 2 are electrically connected with, and are superimposed for base source voltage to be superimposed and export with offset voltage
Voltage.Biasing amplification module 4 is electrically connected with voltage superposition module 3 and preposition DAC module 5, for receiving voltage laminating module 3
The ac voltage signal that the superimposed voltage of output and preposition DAC module 5 export, and to the alternating voltage of preposition DAC module 5 output
Signal does biasing enhanced processing to export feedback voltage signal.In the present embodiment, the alternating voltage that preposition DAC module 5 exports
For biasing non-zero ac voltage signal, the offset voltage that offset voltage input module 2 inputs is used to compensate preposition DAC module signal
The DC offset voltage of the ac voltage signal of 5 outputs, can so lift the amplification of the voltage signal amplifying circuit of the present invention
Precision so that the feedback voltage signal precision of the voltage signal amplifying circuit output by the present invention is high.
Preposition DAC module 5 in liquid crystal display, its effect are output voltage signals it is, preposition DAC module 5.
The voltage signal amplifying circuit of the present invention is electric by base source voltage input module 1 and compensation by voltage superposition module 3
Direct-current working volts DC after the output voltage superposition of pressure input module 2 as biasing amplification module 4, biasing amplification module 4 will
The pending voltage signal of the preposition input of DAC module 5 simultaneously exports feedback voltage signal, the feedback voltage exported after treatment
The high difference between the feedback voltage signal of theory output of signal accuracy is small.
In the present embodiment, biasing amplification module 4 includes operational amplifier U1 and resistance R1, R2, R3, R4, resistance R1's
One end and resistance R2 one end are electrically connected with operational amplifier U1 inverting input, the resistance R1 other end with it is preposition
DAC module 5 is electrically connected with, and the resistance R2 other end is electrically connected with operational amplifier U1 output end, the resistance R2 other end
It is electrically connected with operational amplifier U1 output end.Resistance R3 one end and resistance R4 one end are same with operational amplifier U1
Phase input is electrically connected with, and resistance the R3 other end and voltage superposition module 3 are electrically connected with, resistance R4 other end ground connection.
In the present embodiment, voltage superposition module 3 includes operational amplifier U2 and resistance R5, R6, R7, R8, R9, resistance R5
One end, resistance R6 one end and resistance R7 one end be electrically connected with operational amplifier U2 in-phase input end, resistance R5
The other end be electrically connected with base source voltage input module 1, resistance the R6 other end and offset voltage input module 2 electrically connect
Connect, resistance R7 other end ground connection；Resistance R8 one end and inverting input of the resistance R9 one end with operational amplifier U2
It is electrically connected with, resistance R8 other end ground connection, the resistance R9 other end is electrically connected with operational amplifier U2 output end, computing
Amplifier U2 output end is electrically connected with to be electrically connected with the resistance R3 other end.Voltage superposition module 3 is only capable of using the structure
The voltage that the enough voltage inputted to base source voltage input module 1 and offset voltage input module 2 input is overlapped, can't
Above-mentioned two voltage is amplified.
In the present embodiment, base source voltage input module 1 includes operational amplifier U3 and base source voltage source V1, operation amplifier
Device U3 in-phase input end is electrically connected with base source voltage source V1, operational amplifier U3 inverting input and operational amplifier U3
Output end be electrically connected with, operational amplifier U3 output end and the resistance R5 other end are electrically connected with.Base source control source mould
Block 1 can ensure that the voltage of operational amplifier U3 output end output is equal to base source voltage source V1 to operation amplifier using the structure
The voltage of device U3 inputs, and operational amplifier U3 output voltage does not interfere with operational amplifier U3 input voltage.
In the present embodiment, offset voltage input module 2 includes operational amplifier U4, resistance R10, resistance R11, voltage source
V2 and voltage source V3, wherein, resistance R10 one end and same opposite input of the resistance R11 one end with operational amplifier U4
It is electrically connected with, is electrically connected with voltage source V3 one of in the resistance R10 other end and the resistance R11 other end, it is another
Individual to be electrically connected with voltage source V2, the anti-phase of operational amplifier U4 is electrically connected with to input and operational amplifier U4 output end
Afterwards, operational amplifier U4 output end and the resistance R6 other end are electrically connected with.In the present embodiment, the resistance R11 other end
It is electrically connected with voltage source V2, resistance the R10 other end and voltage source V3 are electrically connected with.In other embodiments, resistance R11
The other end is electrically connected with voltage source V3, and resistance the R10 other end and voltage source V2 are electrically connected with.Offset voltage input module 2
It can ensure that the voltage of operational amplifier U4 output end output is equal to the voltage of operational amplifier U4 inputs using the structure, and
Operational amplifier U4 output voltage does not interfere with operational amplifier U4 input voltage
It should be noted that in the present embodiment, voltage between resistance R11 and R10, that is, operational amplifier U4 are positive
The magnitude of voltage of input will be that positive voltage (needs when select V2 and V3 to ensure that big device U4 is positive to input namely in foregoing circuit
The magnitude of voltage at end is honest), its function is the counteracting preposition direct current biasing of itself of DAC module 5.Due in the application
DAC module 5 and operational amplifier U1 reverse input end is electrically connected with, and the direct current biasing of DAC module 5 is negative value, described with need
The magnitude of voltage for ensureing operational amplifier U4 positive inputs is positive voltage, the DC offset voltage of DAC module 5 pull back for
0V.Operational amplifier U4 output voltage is overlapped with the voltage that operational amplifier U3 is exported by voltage superposition module 3, is made
To influence the DC reference of final amplified signal.In other embodiments, the voltage at the resistance R10 and R11 nodes is also
It can be produced by program voltage generator.
It is understood that voltage superposition module 3 is used for base source voltage input module 1 and offset voltage input module 2
The voltage of input is overlapped, and base source voltage input module 1 and the position of offset voltage input module 2 can be exchanged, i.e. Ji Yuan
Voltage input module 1 and resistance R6 is electrically connected with, and offset voltage input module 2 and resistance R5 is electrically connected with.
Voltage signal amplifying circuit in the present embodiment is for example using in a liquid crystal display, for liquid crystal display
The ac voltage signal of preposition DAC module input is amplified, the voltage after amplification for controlling pixel electrode.Tool
Body, preposition DAC module 5 is, for example, the preposition DAC module of 12.The preposition DAC module of 12 is being applied to liquid crystal display
, it is necessary to which the ac voltage signal that 12 preposition DAC is exported amplifies twice when middle.
When the voltage signal that the voltage signal amplifying circuit using the present invention inputs to preposition DAC module 5 is amplified,
The voltage signal that preposition DAC module 5 inputs is designated as Vdac, the voltage exported at self-resistance R10 and R11 node is designated as
Voffset, voltage superposition module 3 export voltage be designated as Vdc the present invention voltage signal amplifying circuit output voltage V with it is defeated
The relation entered between voltage Vdac is：V=(- R2/R1) * Vdac+Vdc, wherein, R2/R1 value is about that 2, Vdc is equal to 5.By
Multiple authentication, voltage signal amplifying circuit of the voltage signal that preposition DAC module 5 inputs by the present invention is actual amplify after with reason
By the difference between value value of magnification between positive and negative 10mv, difference is small, and amplification precision is high.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, as long as being the technical spirit pair according to the present invention without departing from technical solution of the present invention content
Any simple modification, equivalent change and modification that above example is made, in the range of still falling within technical solution of the present invention.
Claims (9)
- A kind of 1. voltage signal amplifying circuit, it is characterised in that including：For inputting the base source voltage input module (1) of base source voltage；Offset voltage input module (2) for input offset voltage；The voltage superposition module being electrically connected with base source voltage input module (1) and the offset voltage input module (2) (3), the voltage superposition module (3) is used to base source voltage and offset voltage is superimposed to and exported superimposed voltage；AndThe biasing amplification module (4) being electrically connected with the voltage superposition module (3), the biasing amplification module (4) receive institute The superimposed voltage of voltage superposition module (3) output and the ac voltage signal of preposition DAC module (5) output are stated, and to the friendship Stream voltage signal does biasing enhanced processing；The ac voltage signal of DAC module (5) output is biasing non-zero ac voltage signal, and the offset voltage inputs mould The offset voltage of block (2) input is used for the direct current biasing electricity for compensating the ac voltage signal of preposition DAC module (5) output Pressure.
- 2. voltage signal amplifying circuit according to claim 1, it is characterised in that the biasing amplification module (4) includes Operational amplifier U1 and resistance R1, R2, R3, R4, one end of the resistance R1 and resistance R2 one end with the computing Amplifier U1 inverting input is electrically connected with, and the other end of the resistance R1 is electrically connected with the preposition DAC module (5), The output end of the other end of the resistance R2 and the operational amplifier U1 is electrically connected with, one end and the electricity of the resistance R3 Hinder in-phase input end of the R4 one end with the operational amplifier U1 to be electrically connected with, the other end and the electricity of the resistance R3 Laminating module (3) is pressed to be electrically connected with, the other end ground connection of the resistance R4.
- 3. voltage signal amplifying circuit according to claim 2, it is characterised in that the voltage superposition module (3) includes Operational amplifier U2 and resistance R5, R6, R7, R8, R9, one end of the resistance R5, one end of the resistance R6 and the resistance R7 one end with the in-phase input end of the operational amplifier U2 with being electrically connected with, the other end and the base of the resistance R5 Source voltage input module (1) is electrically connected with, and the other end of the resistance R6 electrically connects with the offset voltage input module (2) Connect, the other end ground connection of the resistance R7；One end of the resistance R8 and the resistance R9 one end with the computing with putting Big device U2 inverting input is electrically connected with, the other end ground connection of the resistance R8, the other end and the fortune of the resistance R9 The output end for calculating amplifier U2 is electrically connected with, and the output end of the operational amplifier U2 and the other end of the resistance R3 electrically connect Connect.
- 4. voltage signal amplifying circuit according to claim 3, it is characterised in that base source voltage input module (1) Including operational amplifier U3 and base source voltage source V1, the in-phase input end of the operational amplifier U3 and the base source voltage source V1 Connect, the output end of the inverting input of the operational amplifier U3 and the operational amplifier U3 is electrically connected with, and the computing is put Big device U3 output end and the other end of the resistance R5 is electrically connected with.
- 5. voltage signal amplifying circuit according to claim 4, it is characterised in that the offset voltage input module (2) Including operational amplifier U4, resistance R10, resistance R11, voltage source V2 and voltage source V3, wherein, one end of the resistance R10 with One end of the resistance R11 is electrically connected with the in-phase input end of the operational amplifier U4, the other end of the resistance R10 With being electrically connected with voltage source V3 one of in the other end of the resistance R11, another is electrical with the voltage source V2 Connection；The anti-phase of the operational amplifier U4 is electrically connected with to input and the operational amplifier U4 output end, the fortune Amplifier U4 output end is calculated to be electrically connected with the other end of the resistance R6；The voltage source V2 and voltage source V3 is through institute State resistance R10 and after the resistance R11 partial pressures, the voltage provided the in-phase input end of the operational amplifier U4 is positive electricity Pressure.
- 6. voltage signal amplifying circuit according to claim 5, it is characterised in that the other end of the resistance R11 and institute Voltage source V2 electric connections are stated, the other end of the resistance R10 is electrically connected with the voltage source V3.
- 7. voltage signal amplifying circuit according to claim 5, it is characterised in that the other end of the resistance R11 and institute Voltage source V3 electric connections are stated, the other end of the resistance R10 is electrically connected with the voltage source V2.
- 8. voltage signal amplifying circuit according to claim 4, it is characterised in that the offset voltage input module (2) For programmable voltage generator, the offset voltage input module (2) and the in-phase input end of the operational amplifier U4 are electrical Connection, provides positive voltage, the operational amplifier U4's is anti-phase to input for the in-phase input end of the operational amplifier U4 It is electrically connected with the output end of the operational amplifier U4, the output of the other end of the resistance R6 and the operational amplifier U4 End is electrically connected with.
- 9. according to the voltage signal amplifying circuit described in claim 2-9 any one, it is characterised in that R2/R1 value is 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710985780.3A CN107819444B (en) | 2017-10-20 | 2017-10-20 | Voltage signal amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710985780.3A CN107819444B (en) | 2017-10-20 | 2017-10-20 | Voltage signal amplifying circuit |
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| Publication Number | Publication Date |
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| CN107819444A true CN107819444A (en) | 2018-03-20 |
| CN107819444B CN107819444B (en) | 2021-06-22 |
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Cited By (2)
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| CN109859710A (en) * | 2019-02-26 | 2019-06-07 | 昆山龙腾光电有限公司 | Gate driving circuit |
| CN110675796A (en) * | 2019-09-25 | 2020-01-10 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit, display device and viewing angle control method |
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| CN107819444B (en) | 2021-06-22 |
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