CN206370151U - Infrared receiving circuit - Google Patents
Infrared receiving circuit Download PDFInfo
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- CN206370151U CN206370151U CN201720019880.6U CN201720019880U CN206370151U CN 206370151 U CN206370151 U CN 206370151U CN 201720019880 U CN201720019880 U CN 201720019880U CN 206370151 U CN206370151 U CN 206370151U
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Abstract
A kind of infrared receiving circuit, including：Photodiode；Dark current suppression module, the dark current suppression module is connected with the current output terminal of the photodiode, the dark current in output current signal for removing the photodiode；Main receiving module, the main receiving module is connected with photodiode and dark current suppression module, voltage signal is converted to for the effective current signal after the removal dark current that exports photodiode and analog-to-digital conversion formation data signal is carried out to the voltage signal, and exports the data signal.Above-mentioned infrared receiving circuit avoids the influence of dark current, improves the accuracy that signal is received.
Description
Technical field
The utility model is related to the communications field, more particularly to a kind of infrared receiving circuit.
Background technology
At present, IR remote controller is own through the standarized component as household electrical appliance.Television set, video recorder, DVD, audio frequency power amplifier,
Nearly all function of the equipment such as the infrared copy meter inside air-conditioning, national grid can be controlled by IR remote controller.
Fig. 1 a are the isoboles of infrared transtation mission circuit, and Fig. 1 b are the isoboles of infrared receiving circuit.
In Fig. 1 a, the encoded modules 111 of input signal In are encoded, and then pass through voltage to electric current modulus of conversion
Voltage signal is converted into current signal by block 112, light emitting diode 113 is sent infrared light.
In Fig. 1 b, the photodiode 121 is received after infrared light, current signal is produced, through overcurrent to voltage
Modular converter 122 changes into voltage signal, then is decoded by decoder module 123, obtains output signal.
Circuit in traditional infrared receiving circuit such as Fig. 1 b, is all packaged on independent chip, is unfavorable for system
It is integrated, and received IR signal easily influenceed by the dark current of light emitting diode, and accuracy needs further raising.
Need proposition is a kind of new to be beneficial to integrated and influenceed less infrared receiving circuit by dark current.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of infrared receiving circuit, to reduce dark current influence.
In order to solve the above problems, the utility model provides a kind of infrared receiving circuit, including：Photodiode；Secretly
Electric current suppression module, the dark current suppression module is connected with the current output terminal of the photodiode, described for removing
Dark current in the output current signal of photodiode；Main receiving module, the main receiving module is with photodiode and secretly
Electric current suppression module is connected, and voltage is converted to for the effective current signal after the removal dark current that exports photodiode
Signal simultaneously carries out analog-to-digital conversion formation data signal to the voltage signal, and export the data signal.
Optionally, the dark current suppression module includes current lens unit, the first operational amplifier and low-pass filter circuit；
The current lens unit is made up of two nmos pass transistors, and the input of the current lens unit is connected to by PMOS transistor
Power end, the output end of the current lens unit is connected to the current output terminal of photodiode；The operational amplifier it is defeated
Go out the grid that end is connected to the PMOS transistor by NOT gate, an input of first operational amplifier is connected to common mode
Voltage end, another input is connected to the current output terminal of photodiode by the low-pass filter circuit.
Optionally, the low-pass filter circuit includes：First electric capacity and first resistor；Described first resistor one end is connected to
The current output terminal of photodiode, the other end is connected to first operational amplifier and the electric capacity；First electric capacity
One end is connected to the first resistor, other end ground connection.
Optionally, the main receiving module includes：Current Voltage converting unit, amplifying unit and AD conversion unit；Institute
The current output terminal that Current Voltage converting unit is connected to the photodiode is stated, for export the photodiode
Effective current signal amplifies and is converted to voltage signal；The amplifying unit is connected to the Current Voltage converting unit, is used for
The voltage signal amplification that the Current Voltage converting unit is exported；The AD conversion unit is connected with the amplifying unit,
Voltage signal for the amplifying unit to be exported is converted to data signal and exported.
Optionally, the Current Voltage converting unit includes trans-impedance amplifier and second resistance, the second resistance connection
The negative input end of the trans-impedance amplifier and the current output terminal of photodiode.
Optionally, the amplifying unit includes the second operational amplifier, 3rd resistor and the 4th resistance, the 3rd resistor
The output end and negative input end of second operational amplifier are connected, the 4th resistance connects second operational amplifier
Negative output terminal.
Optionally, the AD conversion unit includes comparator, and the positive input terminal of the comparator is connected to reference voltage
End, the other end of the comparator is connected to the output end of the second operational amplifier.
Optionally, in addition to：Digital module, the digital module is connected with main receiving module, is connect for receiving the master
Receive the data signal of module output.
Infrared receiving circuit of the present utility model includes dark current suppression module, the electricity for filtering photodiode output
Flow signal so that the signal that the infrared receiving circuit is received is more accurate；Also, the electronics that the infrared receiving circuit is used
Element can be integrated in CMOS technology, be easy to integrated, advantageously reduce circuit manufacturing cost.
Brief description of the drawings
Fig. 1 a are the equivalent structure schematic diagram of the infrared transtation mission circuit of the utility model prior art；
Fig. 1 b are the equivalent structure schematic diagram of the infrared receiving circuit of the utility model prior art；
Fig. 2 is the structural representation of the infrared receiving circuit of the embodiment of the utility model one；
Fig. 3 is the structural representation of the infrared receiving circuit of the embodiment of the utility model one；
Fig. 4 is the structural representation of the infrared receiving circuit of the embodiment of the utility model one；
Fig. 5 shows for the structure of the dark current suppression module in the infrared receiving circuit of the embodiment of the utility model one
It is intended to；
Fig. 6 is the structural representation of the infrared receiving circuit of the embodiment of the utility model one.
Embodiment
The embodiment of the infrared receiving circuit provided below in conjunction with the accompanying drawings the utility model elaborates.
Fig. 2 is refer to, is the modular structure schematic diagram of the infrared structure circuit of the embodiment of the utility model one.
The infrared receiving circuit includes：Photodiode 210, main receiving module 230, the and of dark current suppression module 250
Digital module 240.
The photodiode 210 is used to receive infrared signal, and the infrared light that for example IR remote controller is sent produces electric current
Signal.
Because photodiode 210 is when receiving infrared signal, the light such as natural light (sunshine) and fluorescent lamp are believed
Number electric current can be also produced, this one part of current is referred to as dark current.The change of this portion of electrical current is slow, belongs to low frequency signal, can be by AC
Coupling capacitor part suppresses, but when dark current is larger, can be to the bias state of photodiode 210, so as to be connect to signal
Accuracy is received to impact.The dark current suppression module 250 is connected with the current output terminal of the photodiode 210, is used
In removing the dark current in output current, so as to improve the accuracy of signal reception.
Main receiving module 230, the main receiving module 230 connects with photodiode 210 and dark current suppression module 250
Connect, the current signal for being exported by the photodiode 210 after the removal dark current of dark current suppression module 250 is converted to
Voltage signal, and analog-to-digital conversion formation data signal is carried out to the voltage signal, and export the data signal.
In this specific embodiment, the main receiving module 230 includes Current Voltage converting unit 231, amplification and mould
Number converting unit 232.The Current Voltage converting unit 231 is used to by dark current suppress after photodiode 210 is exported
Current signal after the removal dark current of module 250 is converted to voltage signal, in a detailed embodiment, the electric current electricity
Converting unit 231 is pressed to include trans-impedance amplifier, for voltage signal output to be amplified and is converted to current signal, and
And the multiplication factor of the Current Voltage converting unit 231 by a gain control signal, can be controlled.The amplification and modulus
Converting unit 232 is used to be amplified the voltage signal that Current Voltage converting unit 231 is exported, and the voltage after amplification is believed
Number be converted to data signal.The amplification and AD conversion unit 232 can include an amplifier module and a comparator module,
The amplifier module is used to be amplified voltage signal, can control the amplifier mould by a gain control signal
The multiplication factor of block；The comparator module is used for the number for exporting full width more afterwards by comparator to the voltage signal after amplification
Word signal.
In this specific embodiment, the infrared receiving circuit also includes digital module 240, the digital module 240
It is connected with main receiving module 230, for receiving the data signal 230 that the main receiving module 230 is exported.The digital module
240 can be used for carrying out the data signal of reception the operation such as shaping, decoding.The digital module 240 can be integrated in infrared
In receiving circuit, it can also be located at outside the infrared receiving circuit, the defeated of infrared receiving circuit is connected to by circuit interface
Go out end.
The infrared receiving circuit includes dark current suppression module, the current signal for filtering photodiode output,
So that the signal that the infrared receiving circuit is received is more accurate.
Fig. 3 is refer to, is the reception schematic diagram of the infrared receiving circuit of another embodiment of the utility model.
The infrared receiving circuit also includes：Signal detection module 220, the signal detection module 220 and the photoelectricity
Diode 210 is connected, for detecting whether the photodiode 210 has electric current output, defeated when having detected electric current output
Go out to enable signal.
The digital module 240 is additionally operable to after signal reception is completed, and sends a reset signal to signal detection module
220, it is to receive infrared signal next time to prepare.The digital module 240 can be integrated in infrared receiving circuit, can also
Outside the infrared receiving circuit, the output end of infrared receiving circuit is connected to by circuit interface.
The infrared receiving circuit automatically detects the electric current that photodiode 210 is produced by signal detection module 220
After signal, produce and enable signal, enable the main receiving module 230, main receiving module 230 receives photodiode 210 and produced
Current signal, and current signal is converted into after voltage signal, amplification and analog-to-digital conversion output digit signals to digital mould
Block 240.Digital module 240 sends a reset signal after completing to receive, and resets the signal detection module 220, is next time
Infrared signal is received to prepare.Due to the main receiving module 230 only after signal detection module 220 detects infrared signal
Enable so that not only to receive signal accurate for whole infrared receiving circuit, also with low-power consumption the characteristics of.
Fig. 4 is refer to, is the circuit diagram of the infrared receiving circuit of the embodiment of the utility model one.
The infrared receiving circuit can also include Current Voltage biasing circuit (not shown in Fig. 4), for be described red
Outer receiving circuit provides each operating voltage, such as Vbias, Vcm, Vcomm.
The negative pole of the photodiode 210 is connected to biased electrical pressure side Vbias, in this specific embodiment, described
Biased electrical pressure side Vbias is connected to the negative pole of the photodiode, the voltage follower by a voltage follower 301
301 can improve Vbias stability.
The infrared receiving module also includes a dark current suppression module 250, and described one end of dark current suppression module 250 connects
Common-mode voltage end Vcm is connected to, the other end is connected to the current output terminal Out of photodiode 210, for removing the photoelectricity two
Dark current in the current signal that pole pipe 210 is exported so that the photodiode 210 is received from current output terminal Out to main
The electric current that module 230 is exported is effective current signal.
The main receiving module 230 includes：Current Voltage converting unit, is connected to the electric current output of the photodiode
Out is held, the current signal for the photodiode to be exported amplifies and is converted to voltage signal；Amplifying unit, is connected to
The Current Voltage converting unit, the voltage signal for the Current Voltage converting unit to be exported amplifies；Analog-to-digital conversion list
Member, is connected with the amplifying unit, and the voltage signal for the amplifying unit to be exported is converted to data signal and exported extremely
Digital module.
In this specific embodiment, the Current Voltage converting unit includes trans-impedance amplifier 231 and resistance Rf1, institute
The negative input end for stating trans-impedance amplifier 231 is connected to the current output terminal Out of photodiode 210, and positive input terminal is connected to electricity
Pressure side Vcomm, the output end and negative input end of the resistance Rf1 connections trans-impedance amplifier 231, the photodiode
210 output current is amplified by the trans-impedance amplifier 231 and is converted into voltage signal, output to amplifying unit.Institute
State voltage end Vcomm and common-mode voltage end Vcm is connected to by a voltage follower 302, the resistance Rf1 can be variable electricity
Resistance, is conveniently adjusted the multiplication factor of the Current Voltage converting unit.
In the embodiment, the amplifying unit includes amplifier 232, resistance Rf2 and resistance Rin2, the amplification
The positive input terminal of device 232 is connected to the output end of trans-impedance amplifier 231, and negative input end is connected to voltage end Vcomm, the resistance
The Rf2 connections output end of amplifier 232 and negative input end, the negative output terminal of the resistance Rin2 connections amplifier 232
With voltage end Vcomm.The voltage signal that the amplifying unit is exported to trans-impedance amplifier 231 is amplified, and is exported to modulus
Converting unit.The resistance Rf2 can be variable resistor, be conveniently adjusted the multiplication factor of the amplifying unit.
In the embodiment, the AD conversion unit includes comparator 233, the positive input of the comparator 233
End is connected to reference voltage generation unit 234, and the reference voltage generation unit 234 is used for comparator input reference voltage
Vref, the other end of the comparator 233 is connected to the output end of amplifier 232, by the comparator 233 by voltage signal
Be converted to data signal output.
In embodiment of the present utility model, the connection between the main unit of receiving module 230
With using the connection of AC coupled modes, to remove the low-frequency component in circuit, reduce the dark electricity of photodiode 210 to greatest extent
The influence of stream.
The infrared receiving circuit can also include digital module, for receiving the number that the main receiving module 230 is exported
Word signal.
Fig. 5 is refer to, is the circuit structure signal of the dark current suppression module 250 of the embodiment of the utility model one
Figure.
The dark current suppression module 250 includes：The current lens unit being made up of nmos pass transistor N1 and N2, the electric current
The input of mirror unit is connected to power end Vdda by PMOS transistor P1, and the output end of the current lens unit is connected to light
The current output terminal Out of electric diode 210；Operational amplifier A 1, the output end of the operational amplifier A 1 is connected by NOT gate 251
The grid of the PMOS transistor P1 is connected to, an input of the operational amplifier A 1 is connected to common-mode voltage end Vcm, another
Input is connected to the current output terminal Out of photodiode 210 by a low-pass filter circuit, in the embodiment
In, the operational amplifier A 1 is operated in negative-feedback state, is conducive to improving the stability of circuit.
In the embodiment, the low-pass filter circuit includes electric capacity C2 and resistance R2；Described resistance R2 one end connects
The current output terminal Out of photodiode 210 is connected to, the other end is connected to operational amplifier A 1 and the electric capacity C2；The electricity
Hold C2 one end and be connected to the resistance R2, other end ground connection.In other embodiments of the present utility model, the low pass
Filter circuit can also be other circuit structures.
Photodiode 210 is after infrared signal is received, and the current signal of output includes dark current and effectively letter
Number electric current, the dark current is usually direct current or low-frequency current, and the current signal is after low-pass filter circuit, electric current letter
Dark current in number produces voltage signal at the connection end two ends of resistance R2 and the negative input end of operational amplifier A 1, and input is to putting
Big device A1 negative input end, controls the PMOS transistor P1 to lead after amplifying, negated again by NOT gate 251 through the amplifier A1
It is logical.The multiplication factor of the amplifier A1 can be adjusted so that the PMOS transistor P1 flow to nmos pass transistor N1 electric current
It is consistent with the dark current of photodiode 210, due to current mirroring circuit effect so that also produce phase in the nmos pass transistor N2
Same electric current, so that in the current signal that the photodiode 210 is exported, dark current flows into ground through nmos pass transistor N2
End so that the dark current component in current signal is suppressed, the photodiode 210 is described from current output terminal Out inputs
The electric current of main receiving module 230 is described infrared so as to improve to irradiate the effective current signal produced by infrared signal
The accuracy that the signal of receiving circuit is received.
Fig. 6 is refer to, is the structural representation of the infrared receiving circuit of another embodiment of the utility model.
The infrared receiving circuit also includes a signal detection module 220, and the signal detection module 220 includes：Detection
Resistance Rin and comparator 221, the two ends of the two ends of the detection resistance Rin respectively with photodiode 210 are connected, the light
Electric diode 210 produces current signal after infrared signal is received.Photodiode 210 is exported to signal detection mould
The electric current of block 220 passes through after detection resistance Rin, and voltage difference is produced at the detection resistance Rin two ends.In the specific embodiment party
In formula, the current output terminal Out of the photodiode 210 by Cin and the R1 filter circuit constituted by being connected to the letter
Number detection module 220 and main receiving module 230, pass through AC couplings and further remove the current signal that photodiode 210 is exported
In low-frequency component.
The positive input terminal and negative input end of the comparator 221 are respectively connecting to the two ends of the detection resistance Rin, work as institute
When stating detection resistance Rin two ends generation voltage difference, the comparator 221 exports corresponding detection signal.Of the present utility model
In embodiment, the positive input terminal of the comparator 221 is connected to the detection resistance Rin and photodiode 210
The connected one end of negative pole, the negative input end of the comparator 221 is connected to detection resistance Rin and photodiode 210 electric current
One end of output end Out connections, and the comparator 221 carries system balance, so that the comparator is in the inspection
When there is voltage at measuring resistance Rin two ends, high level is exported；When there is no voltage at the detection resistance Rin two ends, low level is exported.
The comparator 221 is when detecting signal, and the high level of output makes main receiving module 230 work as signal is enabled.
The signal detection module 220 can also include：Digital filtering unit 222, the digital filtering unit 222 and institute
The output end connection of comparator 221 is stated, for being filtered shaping to output signal, output effectively enables signal.The numeral
Filter unit 222 can be made up of filter circuit, in other embodiments of the present utility model, can also be without described
Digital filtering unit 222.
In this specific embodiment, the current output terminal Out of the signal detection module 220 and photodiode 210
Between be connected with second switch K2, specifically, the current output terminal of the second switch K2 connections photodiode 210
Out and detection resistance Rin.The second switch K2 default conditions are conducting state so that the signal detection module 220 is certainly
It is dynamic that infrared signal is detected.After infrared signal is detected, the enable signal that the signal detection module 220 is exported makes
The circuit work of main receiving module 230, and the second switch K2 is disconnected, the detection of stop signal.
In this specific embodiment, the current output terminal Out of the main receiving module 230 and photodiode 210 it
Between be connected with first switch K1, specifically, the current output terminal Out of the first switch K1 connections photodiode 210
With the negative input end of trans-impedance amplifier 231.The first switch K1 default conditions are off-state, in the signal detection module
220 when being not detected by infrared signal, and the main receiving module 230 does not work, and advantageously reduces the work(of the infrared receiving circuit
Consumption.In an embodiment of the present utility model, the output end of the signal detection module 220 is connected to described first
K1 and second switch K2 is switched, after the signal detection module 220 detects infrared signal, the enable signal of output makes described
First switch K1 is turned on, and the main receiving module 230 is worked, while disconnecting second switch K2.
The infrared receiving module can also include a digital module, for receiving the numeral that main receiving module 230 is exported
Signal.The digital module is additionally operable to after the data signal that main receiving module 230 is sent is received, and is sent one and is resetted letter
Number, the reset signal is used to control the first switch K1 and second switch K2 to recover to default conditions, is to receive next time
Infrared signal is prepared.In an embodiment of the present utility model, the reset signal output end of the digital module
It is connected to the first switch K1 and second switch K2.
The first switch K1 and second switch K2 can be single switch element, such as MOS transistor, triode or crystalline substance
Brake tube etc. or the circuit being made up of multiple switch element.
Above-mentioned infrared receiving circuit has signal detection module, only when signal detection module detects infrared signal,
Just make winner's receiving module work, so as to reduce the power consumption of circuit；Also, the infrared receiving circuit can also include dark current
Suppression module, the current signal for filtering photodiode output so that the signal that the infrared receiving circuit is received is more
Accurately；Also, the electronic component that the infrared receiving circuit is used can be integrated in CMOS technology, be easy to it is integrated, favorably
In reduction circuit manufacturing cost.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
Art personnel, on the premise of the utility model principle is not departed from, can also make some improvements and modifications, these improvements and modifications
Also it should be regarded as protection domain of the present utility model.
Claims (8)
1. a kind of infrared receiving circuit, it is characterised in that including：
Photodiode；
Dark current suppression module, the dark current suppression module is connected with the current output terminal of the photodiode, for going
Except the dark current in the output current signal of the photodiode；
Main receiving module, the main receiving module is connected with photodiode and dark current suppression module, for by the pole of photoelectricity two
Effective current signal after the removal dark current of pipe output, which is converted to voltage signal and carries out modulus to the voltage signal, to be turned
Change to form data signal, and export the data signal.
2. infrared receiving circuit according to claim 1, it is characterised in that the dark current suppression module includes current mirror
Unit, the first operational amplifier and low-pass filter circuit；The current lens unit is made up of two nmos pass transistors, the electric current
The input of mirror unit is connected to power end by PMOS transistor, and the output end of the current lens unit is connected to the pole of photoelectricity two
The current output terminal of pipe；The output end of the operational amplifier is connected to the grid of the PMOS transistor by NOT gate, described
One input of the first operational amplifier is connected to common-mode voltage end, and another input is connected to by the low-pass filter circuit
The current output terminal of photodiode.
3. infrared receiving circuit according to claim 2, it is characterised in that the low-pass filter circuit includes：First electricity
Hold and first resistor；Described first resistor one end is connected to the current output terminal of photodiode, and the other end is connected to described
One operational amplifier and the electric capacity；Described first electric capacity one end is connected to the first resistor, other end ground connection.
4. infrared receiving circuit according to claim 1, it is characterised in that the main receiving module includes：Current Voltage
Converting unit, amplifying unit and AD conversion unit；The Current Voltage converting unit is connected to the electricity of the photodiode
Output end is flowed, the effective current signal for the photodiode to be exported amplifies and is converted to voltage signal；The amplification
Unit is connected to the Current Voltage converting unit, and the voltage signal for the Current Voltage converting unit to be exported amplifies；
The AD conversion unit is connected with the amplifying unit, and the voltage signal for the amplifying unit to be exported is converted to numeral
Signal is simultaneously exported.
5. infrared receiving circuit according to claim 4, it is characterised in that the Current Voltage converting unit is included across resistance
Amplifier and second resistance, the negative input end of the second resistance connection trans-impedance amplifier and the electric current of photodiode are defeated
Go out end.
6. infrared receiving circuit according to claim 5, it is characterised in that the amplifying unit includes the second operation amplifier
Device, 3rd resistor and the 4th resistance, the 3rd resistor connect the output end and negative input end of second operational amplifier, institute
State the negative output terminal that the 4th resistance connects second operational amplifier.
7. infrared receiving circuit according to claim 5, it is characterised in that the AD conversion unit includes comparator,
The positive input terminal of the comparator is connected to reference voltage end, and the other end of the comparator is connected to the second operational amplifier
Output end.
8. infrared receiving circuit according to claim 1, it is characterised in that also include：Digital module, the digital module
It is connected with main receiving module, the data signal for receiving the main receiving module output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720019880.6U CN206370151U (en) | 2017-01-09 | 2017-01-09 | Infrared receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720019880.6U CN206370151U (en) | 2017-01-09 | 2017-01-09 | Infrared receiving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206370151U true CN206370151U (en) | 2017-08-01 |
Family
ID=59391085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720019880.6U Active CN206370151U (en) | 2017-01-09 | 2017-01-09 | Infrared receiving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206370151U (en) |
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2017
- 2017-01-09 CN CN201720019880.6U patent/CN206370151U/en active Active
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Effective date of registration: 20180508 Address after: 201203 Shanghai Pudong New Area free trade pilot area 889 E505-E506 1 Co-patentee after: Qingdao Topscomm Communication Inc. Patentee after: Shanghai Yin Qi integrated circuit Co. Ltd. Address before: 201203 Shanghai Pudong New Area free trade pilot area 889 E505-E506 1 Patentee before: Shanghai Yin Qi integrated circuit Co. Ltd. |