CN110515490A - Signal processing circuit - Google Patents
Signal processing circuit Download PDFInfo
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- CN110515490A CN110515490A CN201910795574.5A CN201910795574A CN110515490A CN 110515490 A CN110515490 A CN 110515490A CN 201910795574 A CN201910795574 A CN 201910795574A CN 110515490 A CN110515490 A CN 110515490A
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- module
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- photoelectric
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
Abstract
The present invention provides a kind of signal processing circuits, comprising: photoelectric conversion module is connected by Current amplifier module with across resistance amplification module；Photoelectric current for the optical signal received to be converted into photoelectric current, and is input to current amplification unit by photoelectric conversion module；Wherein, optical signal includes infrared signal and ambient light signal, and photoelectric current includes alternating current corresponding with infrared signal, and DC current corresponding with ambient light signal；Current amplifier module obtains the first alternating current, and DC current and the first alternating current are input to across resistance amplification module for amplifying to receiving alternating current；Across resistance amplification module, for exporting first voltage according to DC current and the first alternating current.Signal processing circuit provided by the invention, Current amplifier module only amplifies the alternating current in photoelectric current, without amplifying to DC current, so that the signal in circuit is not easy to be saturated, to improve the identification susceptibility of infrared signal.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of signal processing circuits.
Background technique
With the continuous development of science and technology, what infrared touch panel was more and more extensive is applied to different fields.Infrared touch
Screen is mounted on the frame of display surrounding by arrangement, and is mounted on infrared transmitting tube and infrared receiving tube structure within frame
At infrared receiving tube is used to receive and process the infrared signal of infrared transmitting tube transmitting, wherein receiving processing infrared light letter
Number while, inevitably receive ambient light signal, such as the optical signal of sunlight, incandescent lamp transmitting.
Existing signal processing circuit carries out photoelectric conversion to optical signal by photodiode, obtains photoelectric current, and lead to
A triode is crossed to amplify photoelectric current.Using existing signal processing circuit, photoelectric current is amplified by a triode,
Cause the corresponding electric current of ambient light signal to be amplified, be easy to cause the saturation of signal in circuit, to reduce infrared signal
Identify susceptibility.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of signal processing circuits, to solve in the prior art, environment
The corresponding electric current of optical signal is amplified, and signal is easily saturated in circuit, the low problem of the identification susceptibility of infrared signal.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of signal processing circuit, comprising:
Photoelectric conversion module, Current amplifier module and across resistance amplification module；
The photoelectric conversion module is connected with described across resistance amplification module by the Current amplifier module；
The photoelectric conversion module for the optical signal received to be converted into photoelectric current, and the photoelectric current is inputted
To the current amplification unit；Wherein, the optical signal includes infrared signal and ambient light signal, the photoelectric current include with
The corresponding alternating current of the infrared signal, and DC current corresponding with the ambient light signal；
The Current amplifier module obtains for amplifying to the alternating current in the photoelectric current received
One alternating current, and by the photoelectric current the DC current and first alternating current be input to and described amplify across resistance
Module；
It is described across resistance amplification module, for exporting first voltage according to the DC current and first alternating current.
Above-mentioned circuit, optionally, the photoelectric conversion module, comprising:
Photodiode；
The cathode of the photodiode is connected with input voltage, and anode is connected with the Current amplifier module.
Above-mentioned circuit, optionally, the Current amplifier module, comprising:
First order current amplification unit and second level current amplification unit；
The input terminal of the first order current amplification unit is connected with the photoelectric conversion module, output end and described second
The input terminal of grade current amplification unit is connected；
The first order current amplification unit, for being put to the alternating current in the photoelectric current received
Greatly, and by the photoelectric current the DC current and amplified alternating current be input to the second level Current amplifier list
Member；
The output end of the second level current amplification unit is connected with described across resistance amplification module, for the institute received
It states amplified alternating current to amplify, obtains the first alternating current, and by the DC current and first alternating current
Stream is input to described across resistance amplification module.
Above-mentioned circuit, optionally, the first order current amplification unit, comprising:
First triode, the second triode, first resistor, second resistance and first capacitor；
The base stage of first triode collector with the base stage of two triode and first triode respectively
It is connected, collector is connected with the photoelectric conversion module, and emitter is connected with the first end of first resistor；
The collector of second triode is connected with the input terminal of the second level current amplification unit, emitter difference
It is connected with the first end of the second resistance with the first end of first capacitor；
The second end of the second end of the first resistor, the second end of the second resistance and the first capacitor connects respectively
Ground.
Above-mentioned circuit, optionally, the second level current amplification unit, comprising:
Third transistor, the 4th triode, 3rd resistor, the 4th resistance and the second capacitor；
The base stage of the third transistor current collection with the base stage of the 4th triode and the third transistor respectively
Extremely it is connected, collector is connected with the output end of the first order current amplification unit, and the first of emitter and the 3rd resistor
End is connected；
The collector of 4th triode with it is described across resistance amplification module be connected, emitter respectively with the 4th resistance
First end be connected with the first end of second capacitor；
The second end of the second end of the 3rd resistor, the second end of the 4th resistance and second capacitor respectively and
Supply voltage is connected.
Above-mentioned circuit, it is optionally, described across resistance amplification module, comprising:
Amplifier and the 5th resistance；
The inverting input terminal of the amplifier respectively with the first end of the 5th resistance and the Current amplifier module phase
Even, non-inverting input terminal is connected with reference voltage, and output end is connected with the second end of the 5th resistance.
Compared with prior art, the present invention includes the following advantages:
The present invention provides a kind of signal processing circuits, comprising: photoelectric conversion module is by Current amplifier module and across resistance
Amplification module is connected；Photoelectric current for the optical signal received to be converted into photoelectric current, and is input to electricity by photoelectric conversion module
Banish big unit；Wherein, optical signal includes infrared signal and ambient light signal, and photoelectric current includes and the infrared signal pair
The alternating current answered, and DC current corresponding with ambient light signal；Current amplifier module, for the photoelectric current received
In alternating current amplify, obtain the first alternating current, and by photoelectric current DC current and the first alternating current it is defeated
Enter to across resistance amplification module；Across resistance amplification module, for exporting first voltage according to DC current and the first alternating current.This
The signal processing circuit provided is invented, Current amplifier module only amplifies the alternating current in photoelectric current, without to direct current
Electric current amplifies, so that the signal in circuit is not easy to be saturated, to improve the identification susceptibility of infrared signal.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of signal processing circuit provided by the invention；
Fig. 2 is a kind of circuit diagram of signal processing circuit provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Refering to fig. 1, the embodiment of the invention discloses a kind of signal processing circuits, comprising: photoelectric conversion module 101, electric current
Amplification module 102 and across resistance amplification module 103.
Photoelectric conversion module 101 is connected by Current amplifier module 102 with across resistance amplification module 103.
Photoelectric current for the optical signal received to be converted into photoelectric current, and is input to electric current by photoelectric conversion module 101
Amplifying unit 102.
Optionally, referring to Fig.2, in another embodiment of the present invention, a kind of embodiment party of photoelectric conversion module 201
Formula, comprising:
The cathode of photodiode PD1 is connected with input voltage V1, the anode and amplifier module of photodiode PD1
202 are connected, and photodiode PD1 receives optical signal, and the received optical signal of institute is converted into photoelectric current Iin and is exported,
In, which includes infrared signal and ambient light signal, and optionally, ambient light signal includes sunlight and incandescence, light
Electric current includes alternating current I1 corresponding with infrared signal, and DC current I2 corresponding with ambient light signal, therefore, photosensitive
The photoelectric current Iin=I1+I2 of pipe output.
Current amplifier module 102 obtains the first exchange for amplifying to the alternating current in the photoelectric current received
Electric current, and by photoelectric current DC current and the first alternating current be input to across resistance amplification module 103.
Optionally, referring to Fig.2, in another embodiment of the present invention, the first order in Current amplifier module 202 is electric
Banish a kind of embodiment of big unit 203, comprising:
First triode Q1, the second triode Q2, first resistor R1, second resistance R2 and first capacitor C1.
The base stage of first triode Q1 is connected with the base stage of the second triode Q2 with the collector of third level pipe Q1 respectively, the
The collector of one triode Q1 is connected with the anode of photodiode PD1, for receiving the photoelectric current of photodiode PD1 output
The emitter of Iin, the first triode Q1 are connected with the first end of first resistor R1.
The collector of second triode Q2 is connected with the input terminal of second level current amplification unit 204, the second triode Q2
Emitter be connected respectively with the first end of second resistance R2 with the first end of first capacitor C1.
The second end of the second end of first resistor R1, the second end of second resistance R2 and first capacitor C1 respectively with ground GDN
It is connected.
Optionally, the first triode Q1 and the second triode Q2 is NPN triode.
Optionally, for ambient light signal, photodiode exports DC current I2 after carrying out photoelectric conversion, due to first
Triode Q1 and the second triode Q2 be it is symmetrical, capacitor C1 has the function of that logical exchange hinders direct current, so, the second triode Q2
Collector DC current it is equal with the received DC current I2 of the collector of the first triode Q1, therefore, first order electric current
Amplifying unit 203 does not have amplification to DC current I2.
For infrared signal, photodiode exports alternating current I1 after carrying out photoelectric conversion, the second triode Q2's
The product of collector received alternating current I2 and amplification coefficient of the alternating current of collector equal to the first triode Q1, because
This, first order current amplification unit 203 has amplification to alternating current I1.That is, the first order exchanges amplifying unit
203, receive photoelectric current Iin, the electric current Iout1=I2+ β * I1 of output, wherein β is amplification coefficient.
Optionally, referring to Fig.2, in another embodiment of the present invention, the second level in Current amplifier module 202 is electric
Banish a kind of embodiment of big unit 204, comprising:
Third transistor Q3, the 4th triode Q4,3rd resistor R3, the 4th resistance R4 and the second capacitor C2.
The base stage of third transistor Q3 is connected with the base stage of the 4th triode Q4 with the collector of third transistor Q3 respectively,
The collector of third transistor Q3 is connected with the collector of the second triode Q2 of first order current amplification unit 203, and the three or three
The emitter of pole pipe Q3 is connected with the first end of 3rd resistor R3.
The collector of 4th triode Q4 with across resistance amplification module 205 be connected, the emitter of the 4th triode Q4 respectively with
The first end of 4th resistance R4 is connected with the first end of the second capacitor C2.
The second end of the second end of 3rd resistor R3, the second end of the 4th resistance R4 and the second capacitor C2 is electric with power supply respectively
VCC is pressed to be connected.
Optionally, third transistor Q3 and the 4th triode Q4 is PNP triode.
Optionally, the DC current I2 exported for first order current amplification unit 203, due to third triode Q3 and the
Four triode Q4 be it is symmetrical, capacitor C2 has the function of that logical exchange hinders direct current, so, the collector of the 4th triode Q3 it is straight
Galvanic electricity stream is equal with the received DC current I2 of the collector of third transistor Q3, and therefore, second level current amplification unit 203 is right
DC current I2 does not have amplification.
For the alternating current β * I1 that first order current amplification unit 203 exports, the friendship of the collector of the 4th triode Q4
The product of collector received alternating current I2 and amplification coefficient of the galvanic electricity stream equal to third transistor Q3, therefore, second level electricity
Banishing big unit 204 has amplification to alternating current β * I1.That is, the second level exchanges amplifying unit 204, electric current is received
Iout1=I2+ β * I1, the electric current Iout2=I2+ β * β * I1 of output, wherein β is amplification coefficient.It should be noted that first
Resistance R1 and second resistance R2 and 3rd resistor R3 and the 4th resistance R4 are equal；First capacitor C1 and the second capacitor C2 are equal.
It should be noted that being amplified by the secondary current in mirror symmetry single in method provided in an embodiment of the present invention
Member amplifies the alternating current in photoelectric current, and only a kind of specific embodiment provided by the present invention, should not be understood
At limitation of the present invention, the present invention can also be realized by level Four Current amplifier current unit to the alternating current in photoelectric current
It amplifies.
Optionally, referring to Fig.2, in another embodiment of the present invention, a kind of embodiment party across resistance amplification module 205
Formula, comprising:
Amplifier U1 and the 5th resistance R5.
The inverting input terminal of amplifier U1 is respectively and in the first end of the 5th resistance R5 and second level current amplification unit 204
The 4th triode Q4 collector be connected, for receives the 4th triode Q4 collector output electric current Iout2, amplifier
The non-inverting input terminal of U1 is connected with reference voltage Vref, and the second end of the output end of amplifier U1 and the 5th resistance R5 are connected, and uses
In output first voltage Vout, optionally, Vout=Iout2*R5=(I2+ β * β * I1) * R5.
It should be noted that in a certain range, the infrared signal received is corresponding for across resistance amplification module 205
Alternating current amplification factor it is bigger, signal-to-noise ratio is higher, and in the prior art because while amplifying alternating current,
Also DC current is amplified, the electric current in circuit is caused easily to be saturated, and cannot achieve and alternating current is amplified to ideal shape
State, so that infrared light can not be identified, i.e. the susceptibility of infrared signal identification is poor.
In signal processing circuit provided in an embodiment of the present invention, it includes infrared signal and environment that photoelectric conversion module, which receives,
The optical signal of optical signal, and photoelectric conversion, output light electric current are carried out to optical signal, Current amplifier module corresponds in photoelectric current
Exchange amplification, and the DC current that amplified alternating current and photoelectric conversion export is exported, across resistance amplification module according to
According to the DC current that amplified alternating current and photoelectric conversion export, first voltage is exported.It is provided using the embodiment of the present invention
Signal processing circuit, only the alternating current in photoelectric current is amplified, without being amplified to DC current, so that circuit
In signal be not easy to be saturated, to improve the identification susceptibility and signal-to-noise ratio of infrared signal.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place ginseng
See the part explanation of embodiment of the method.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
A kind of signal processing circuit provided by the present invention and device are described in detail above, it is used herein
A specific example illustrates the principle and implementation of the invention, and the above embodiments are only used to help understand originally
The method and its core concept of invention；At the same time, for those skilled in the art, according to the thought of the present invention, specific
There will be changes in embodiment and application range, in conclusion the content of the present specification should not be construed as to of the invention
Limitation.
Claims (6)
1. a kind of signal processing circuit characterized by comprising
Photoelectric conversion module, Current amplifier module and across resistance amplification module；
The photoelectric conversion module is connected with described across resistance amplification module by the Current amplifier module；
The photoelectric current for the optical signal received to be converted into photoelectric current, and is input to institute by the photoelectric conversion module
State current amplification unit；Wherein, the optical signal includes infrared signal and ambient light signal, the photoelectric current include with it is described
The corresponding alternating current of infrared signal, and DC current corresponding with the ambient light signal；
The Current amplifier module obtains first and hands over for amplifying to the alternating current in the photoelectric current received
Galvanic electricity stream, and by the photoelectric current the DC current and first alternating current be input to and described amplify mould across resistance
Block；
It is described across resistance amplification module, for exporting first voltage according to the DC current and first alternating current.
2. circuit according to claim 1, which is characterized in that the photoelectric conversion module, comprising:
Photodiode；
The cathode of the photodiode is connected with input voltage, and anode is connected with the Current amplifier module.
3. circuit according to claim 1 or 2, which is characterized in that the Current amplifier module, comprising:
First order current amplification unit and second level current amplification unit；
The input terminal of the first order current amplification unit is connected with the photoelectric conversion module, output end and second level electricity
The input terminal for banishing big unit is connected；
The first order current amplification unit, for being amplified to the alternating current in the photoelectric current received,
And by the photoelectric current the DC current and amplified alternating current be input to the second level current amplification unit；
The output end of the second level current amplification unit is connected with described across resistance amplification module, for putting described in receiving
Alternating current after big amplifies, and obtains the first alternating current, and the DC current and first alternating current is defeated
Enter to described across resistance amplification module.
4. circuit according to claim 3, which is characterized in that the first order current amplification unit, comprising:
First triode, the second triode, first resistor, second resistance and first capacitor；
The base stage of first triode is connected with the base stage of two triode with the collector of first triode respectively,
Collector is connected with the photoelectric conversion module, and emitter is connected with the first end of first resistor；
The collector of second triode is connected with the input terminal of the second level current amplification unit, and emitter is respectively and institute
The first end for stating second resistance is connected with the first end of first capacitor；
The second end of the second end of the first resistor, the second end of the second resistance and the first capacitor is grounded respectively.
5. circuit according to claim 3, which is characterized in that the second level current amplification unit, comprising:
Third transistor, the 4th triode, 3rd resistor, the 4th resistance and the second capacitor；
The base stage of the third transistor collector phase with the base stage and the third transistor of the 4th triode respectively
Even, collector is connected with the output end of the first order current amplification unit, the first end phase of emitter and the 3rd resistor
Even；
The collector of 4th triode is connected with described across resistance amplification module, emitter respectively with the 4th resistance the
One end is connected with the first end of second capacitor；
The second end of the second end of the 3rd resistor, the second end of the 4th resistance and second capacitor is respectively and power supply
Voltage is connected.
6. circuit according to claim 1, which is characterized in that described across resistance amplification module, comprising:
Amplifier and the 5th resistance；
The inverting input terminal of the amplifier is connected with the first end of the 5th resistance with the Current amplifier module respectively, together
Phase input terminal is connected with reference voltage, and output end is connected with the second end of the 5th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910795574.5A CN110515490B (en) | 2019-08-27 | 2019-08-27 | Signal processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910795574.5A CN110515490B (en) | 2019-08-27 | 2019-08-27 | Signal processing circuit |
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| CN110515490A true CN110515490A (en) | 2019-11-29 |
| CN110515490B CN110515490B (en) | 2023-05-05 |
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ID=68626188
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910795574.5A Active CN110515490B (en) | 2019-08-27 | 2019-08-27 | Signal processing circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021138769A1 (en) * | 2020-01-06 | 2021-07-15 | 深圳市大疆创新科技有限公司 | Amplifying circuit, compensation method and radar |
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| CN110515490B (en) | 2023-05-05 |
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