CN103716094B - A kind of visible light communication front end circuit - Google Patents
A kind of visible light communication front end circuit Download PDFInfo
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- CN103716094B CN103716094B CN201410004680.4A CN201410004680A CN103716094B CN 103716094 B CN103716094 B CN 103716094B CN 201410004680 A CN201410004680 A CN 201410004680A CN 103716094 B CN103716094 B CN 103716094B
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Abstract
The present invention provides a kind of visible light communication front end circuit, comprising: front end emission circuit and front end receive circuit. Wherein, front end emission circuit is used for the first numerary signal that signal source produces being carried out ac coupling and after amplification, generating the first electric current signal, so that LED operation is in linear section. Front end receive circuit is used for the optical signal by LED produces and is converted into electric current signal, and electric current signal is converted into voltage signal, after low-pass filtering, gain are amplified, generates a two digital signal corresponding with the first numerary signal. Visible, visible light communication front end circuit provided by the invention, it is not necessary to using bias-T type biasing circuit module, circuit cost is low. And front end emission circuit can utilize variable resistor, in a coupled manner, for LED group provides the direct current biasing of controlled size so that LED can provide the brightness needed for illumination, the modulation depth height of input signal is made again.
Description
Technical field
The present invention relates to technical field of visible light communication, say more specifically, relate to a kind of visible light communication front end circuit.
Background technology
In recent years, along with the rise gradually of visible light communication technology, it is studied by more and more scientific research institutions. Usually, it is seen that optical communication is applied to practice from theory, it is necessary to solve the problem that analog front circuit realizes.
At present, prior art is by sending end with the use of bias-T type biasing circuit module and amplifier circuit module, to meet both as LED provides the electric current needed for illumination, making again LED be in good linear working state, to ensure the integrity of signal.
But the Module Price of aforesaid way is expensive, voltage of supply requires high and is not easy to miniaturization. Except this, contriver finds, above-mentioned module is not generally the special driving module of LED, there is impedance mismatch, and the problems such as high and low frequency signal distortion, have impact on the serviceability of visible light communication.
Summary of the invention
In view of this, the present invention provides a kind of visible light communication front end circuit, to overcome the problem of visible ray circuit cost height, impedance mismatch in prior art.
For achieving the above object, the present invention provides following technical scheme:
A kind of visible light communication front end circuit, comprising: front end emission circuit and front end receive circuit;
Described front end emission circuit is used for the first numerary signal that signal source produces being carried out ac coupling and after amplification, generating the first electric current signal, so that LED operation is in linear section;
Described front end receive circuit is for being converted into electric current signal by the optical signal that described LED produces, and described electric current signal is converted into voltage signal, after low-pass filtering, gain are amplified, generates a two digital signal corresponding with described first numerary signal.
Preferably, described front end emission circuit comprises: the first resistance, the first electric capacity, variable resistor, the first amplification circuit, the 2nd amplification circuit and LED;
The first end of described first resistance is connected with the first end of described first electric capacity and the output terminal in outer signal source, 2nd end of described first electric capacity is connected with the described input terminus of the first amplification circuit and the sliding end of described variable resistor respectively, described variable resistor is serially connected between the first predeterminated voltage and ground, the input terminus of described 2nd amplification circuit is connected with the output terminal of described first amplification circuit, and the output terminal of described 2nd amplification circuit is connected with described LED.
Preferably, described front end receive circuit comprises: reception diode, the 2nd electric capacity, electric current turn voltage circuit, low-pass filtering circuit and gain amplifying circuit;
Described reception diode is serially connected in the 2nd between predeterminated voltage and ground, the input terminus that the anode of described reception diode turns voltage circuit by described 2nd electric capacity with described electric current is connected, the input terminus of output terminal and described low-pass filtering circuit that described electric current turns voltage circuit is connected, the input terminus of described gain amplifying circuit is connected with the output terminal of described low-pass filtering circuit, and the output terminal of described gain amplifying circuit is as the output terminal of described front end receive circuit.
Preferably, described first amplification circuit comprises the first operational amplifier, and described 2nd amplification circuit comprises the 2nd operational amplifier, and described first operational amplifier and described 2nd operational amplifier are the amplifier chip of OPA2670, OPA2673 or OPA2674.
Preferably, described LED is blue chip and yellow fluorescent powder mixed type LED or RGB three primary colours mixed type LED.
Preferably, described reception diode place is provided with condensor.
Preferably, the optical filtering eyeglass being arranged between described diode and described LED is also comprised.
Preferably, described reception diode is SiPIN type LED or APD.
Preferably, described electric current turns the integrated circuit (IC) chip that voltage circuit comprises AD8015A.
Preferably, described front end receive circuit is also provided with metallic shield cover.
Via above-mentioned technical scheme it will be seen that compared with prior art, the present invention provides a kind of visible light communication front end circuit, comprising: front end emission circuit and front end receive circuit. Wherein, described front end emission circuit is used for the first numerary signal that signal source produces being carried out ac coupling and after amplification, generating the first electric current signal, so that LED operation is in linear section. Described front end receive circuit is for being converted into electric current signal by the optical signal that described LED produces, and described electric current signal is converted into voltage signal, after low-pass filtering, gain are amplified, generates a two digital signal corresponding with described first numerary signal. Visible, visible light communication front end circuit provided by the invention, it is not necessary to using bias-T type biasing circuit module, circuit cost is low. And front end emission circuit can utilize variable resistor, in a coupled manner, for LED group provides the direct current biasing of controlled size so that LED can provide the brightness needed for illumination, the modulation depth height of input signal is made again. In addition, the first operational amplifier and the 2nd operational amplifier is adopted to be broadband operational amplifier, it is possible to effectively to improve the information bandwidth of circuit transmission. And in front end receive circuit, the AD8015AR chip of superior performance is adopted to build opto-electronic conversion circuit, build rear class low-pass filtering, signal amplification circuit with integrated chip, it is possible to effectively improve the reception bandwidth of circuit, and reduce the noise that receiving circuit self is introduced.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
The structural representation of front end emission circuit in a kind of visible light communication front end circuit that Fig. 1 provides for the embodiment of the present invention;
The structural representation of front end receive circuit in a kind of visible light communication front end circuit that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the multiplexing of front end emission circuit in a kind of visible light communication front end circuit that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
The present invention provides a kind of visible light communication front end circuit, comprising: front end emission circuit and front end receive circuit. Wherein, described front end emission circuit is used for the first numerary signal that signal source produces being carried out ac coupling and after amplification, generating the first electric current signal, so that LED operation is in linear section. Described front end receive circuit is for being converted into electric current signal by the optical signal that described LED produces, and described electric current signal is converted into voltage signal, after low-pass filtering, gain are amplified, generates a two digital signal corresponding with described first numerary signal. Visible, visible light communication front end circuit provided by the invention, it is not necessary to using bias-T type biasing circuit module, circuit cost is low. And front end emission circuit can utilize variable resistor, in a coupled manner, for LED group provides the direct current biasing of controlled size so that LED can provide the brightness needed for illumination, the modulation depth height of input signal is made again. In addition, the first operational amplifier and the 2nd operational amplifier is adopted to be broadband operational amplifier, it is possible to effectively to improve the information bandwidth of circuit transmission. And in front end receive circuit, the AD8015AR chip of superior performance is adopted to build opto-electronic conversion circuit, build rear class low-pass filtering, signal amplification circuit with integrated chip, it is possible to effectively improve the reception bandwidth of circuit, and reduce the noise that receiving circuit self is introduced.
Referring to accompanying drawing 1, be the structural representation of front end emission circuit in a kind of visible light communication front end circuit provided by the invention, wherein, this visible light communication front end circuit also comprises front end receive circuit, as shown in Figure 2.
Wherein, described front end emission circuit is used for the first numerary signal that signal source produces being carried out ac coupling and after amplification, generating the first electric current signal, so that LED operation is in linear section.
Described front end receive circuit is for being converted into electric current signal by the optical signal that described LED produces, and described electric current signal is converted into voltage signal, after low-pass filtering, gain are amplified, generates a two digital signal corresponding with described first numerary signal.
Visible, the visible light communication front end circuit that the present embodiment provides is without the need to using bias-T type biasing circuit module, and circuit cost is low.
On the basis of above-mentioned embodiment provided by the invention, it is preferable that, described front end emission circuit comprises: the first resistance, the first electric capacity, variable resistor, the first amplification circuit, the 2nd amplification circuit and LED.
It connects pass:
The first end of described first resistance is connected with the first end of described first electric capacity and the output terminal in outer signal source, 2nd end of described first electric capacity is connected with the described input terminus of the first amplification circuit and the sliding end of described variable resistor respectively, described variable resistor is serially connected between the first predeterminated voltage and ground, the input terminus of described 2nd amplification circuit is connected with the output terminal of described first amplification circuit, and the output terminal of described 2nd amplification circuit is connected with described LED.
Equally, the present embodiment additionally provides the concrete structure of a kind of front end receive circuit, comprising: reception diode, the 2nd electric capacity, electric current turn voltage circuit, low-pass filtering circuit and gain amplifying circuit.
The connection of its each device is closed:
Described reception diode is serially connected in the 2nd between predeterminated voltage and ground, the input terminus that the anode of described reception diode turns voltage circuit by described 2nd electric capacity with described electric current is connected, the input terminus of output terminal and described low-pass filtering circuit that described electric current turns voltage circuit is connected, the input terminus of described gain amplifying circuit is connected with the output terminal of described low-pass filtering circuit, and the output terminal of described gain amplifying circuit is as the output terminal of described front end receive circuit.
It should be noted that, described first amplification circuit comprises the first operational amplifier, described 2nd amplification circuit comprises the 2nd operational amplifier, and described first operational amplifier and described 2nd operational amplifier are the amplifier chip of OPA2670, OPA2673 or OPA2674. Described LED is blue chip and yellow fluorescent powder mixed type LED or RGB three primary colours mixed type LED.
Except this, the present embodiment is also provided with condensor at described reception diode place. And also between described diode and described LED, it is provided with optical filtering eyeglass. Concrete, described reception diode can be SiPIN type LED or APD. Described electric current turns the integrated circuit (IC) chip that voltage circuit can comprise AD8015A. Described front end receive circuit can also be provided with metallic shield cover.
Now in conjunction with above-mentioned connection relation, the principle of work of the visible light communication front end circuit that the present embodiment provides is described, as follows:
First, circuit is by the resistance (resistance of 56 �� in corresponding diagram) of setting the first resistance, it is achieved with the impedance matching of front end signal source circuit, and the signal producing peak power exports. Secondly, useful signal adopts ac coupling mode, accesses in driving circuit by the first electric capacity (electric capacity of 1 �� F in corresponding diagram), avoids galvanic current to pour in down a chimney the normal operation affecting signal source circuit. Afterwards, circuit also adopts the first amplification circuit, to provide enough gains for useful signal and volts DS, and effectively improve signal madulation can the degree of depth. At signal after the first amplification circuit, flow through the 2nd amplification circuit, the input voltage difference at these amplifier two ends is transferred to 5 �� resistance for completing by the 2nd amplification circuit, to produce enough electric currents, both for LED group provides biased, make it be in linear section and have enough illuminating values, again useful signal is loaded on lamp, is converted to visible light signal and sends.
It should be noted that, it is introduce by the biasing resistor of prime due to direct current biasing, and resistance is adjustable, so the direct current biasing size of this driving circuit is adjustable.
The noise that power source circuit is introduced in order to effective filtering, the present embodiment also sets up decoupling electric capacity. In this front transmit circuitry, amplifier can adopt the amplifier of low noise, low off resonance, High Output Current, large bandwidth and high Slew Rate, such as the amplifier chip of OPA2670, OPA2673, OPA2674 series, it is possible to realizing the information transmission of large bandwidth, the linear lag is good. And LED both can adopt blue chip and yellow fluorescent powder mixed type, it is possible to adopt RGB three primary colours mixed type LED. According to RGB mixed type LED, then utilizing this design, moreover it is possible to by combinational circuit, use multiplexing technique to carry out multispectral modulation at sending end, to improve transfer rate, array configuration is as shown in Figure 3.
At visible ray receiving end, front end receive circuit adopts the reception diode (PD) of a highly sensitive, to realize the conversion of optical signal to electrical signal. In order to improve the detection sensitivity of circuit, the present embodiment also takes two kinds of different modes: one, adds reverse biased to photorectifier, is reduced the impact of the inner electric capacity of PD by bias voltage. Two, install condensor additional in the front of photorectifier, so that the light intensity making illumination light be gathered on photorectifier is the strongest.
If adopting monochromatic ray transmission information, also by adopting optical filtering eyeglass, eliminate the impact that unnecessary background light causes. Through the effect of PD, useful signal is converted to corresponding electric current signal and exports. For the ease of late-class circuit to the process of signal, by adopting one-level current-voltage converter in embodiment, the electric current signal of acquisition is converted to voltage signal, and through rear class low-pass filtering, plus and blowup, A/D conversion, recovers as original numerical information exports.
In the present embodiment, the rear class filtering of receiving end, amplification circuit all adopt single-chip integration chip, favorable working performance, stability height. Receive the LED that diode can adopt SiPIN type, such as S6968 series, it is possible to adopt APD. Current-voltage converter then adopts special integrated chip, such as AD8015AR, avoid and adopt broadband low noise amplifier to build the bandwidth limit brought voluntarily, achieve the function of opto-electronic conversion circuit preferably, make the serviceability of receiving circuit reach 100,000,000 magnitudes. Except this, this receiving terminal circuit also by adding lid metallic shield cover, greatly weakens external electromagnetic signal to the interference of receiving circuit, it is to increase the sensitivity of receiving terminal circuit.
In sum: the present invention provides a kind of visible light communication front end circuit, comprising: front end emission circuit and front end receive circuit. Wherein, described front end emission circuit is used for the first numerary signal that signal source produces being carried out ac coupling and after amplification, generating the first electric current signal, so that LED operation is in linear section. Described front end receive circuit is for being converted into electric current signal by the optical signal that described LED produces, and described electric current signal is converted into voltage signal, after low-pass filtering, gain are amplified, generates a two digital signal corresponding with described first numerary signal. Visible, visible light communication front end circuit provided by the invention, it is not necessary to using bias-T type biasing circuit module, circuit cost is low. And front end emission circuit can utilize variable resistor, in a coupled manner, for LED group provides the direct current biasing of controlled size so that LED can provide the brightness needed for illumination, the modulation depth height of input signal is made again. In addition, the first operational amplifier and the 2nd operational amplifier is adopted to be broadband operational amplifier, it is possible to effectively to improve the information bandwidth of circuit transmission. And in front end receive circuit, the AD8015AR chip of superior performance is adopted to build opto-electronic conversion circuit, build rear class low-pass filtering, signal amplification circuit with integrated chip, it is possible to effectively improve the reception bandwidth of circuit, and reduce the noise that receiving circuit self is introduced.
In this specification sheets, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment emphasis illustrated is the difference with other embodiments, between each embodiment identical similar portion mutually see. For the device that embodiment provides, owing to it is corresponding with the method that embodiment provides, so what describe is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the embodiment provided, professional and technical personnel in the field are enable to realize or use the present invention. To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments. Therefore, the present invention can not be limited in these embodiments shown in this article, but be met the widest scope consistent with principle provided in this article and features of novelty.
Claims (8)
1. a visible light communication front end circuit, it is characterised in that, comprising: front end emission circuit and front end receive circuit;
Described front end emission circuit is used for the first numerary signal that signal source produces being carried out ac coupling and after amplification, generating the first electric current signal, so that LED operation is in linear section;
Described front end receive circuit is for being converted into electric current signal by the optical signal that described LED produces, and described electric current signal is converted into voltage signal, after low-pass filtering, gain are amplified, generates a two digital signal corresponding with described first numerary signal;
Wherein, described front end emission circuit comprises: the first resistance, the first electric capacity, variable resistor, the first amplification circuit, the 2nd amplification circuit and LED;
The first end of described first resistance is connected with the first end of described first electric capacity and the output terminal in outer signal source, 2nd end of described first electric capacity is connected with the described input terminus of the first amplification circuit and the sliding end of described variable resistor respectively, described variable resistor is serially connected between the first predeterminated voltage and ground, the input terminus of described 2nd amplification circuit is connected with the output terminal of described first amplification circuit, and the output terminal of described 2nd amplification circuit is connected with described LED;
And, described front end receive circuit comprises: reception diode, the 2nd electric capacity, electric current turn voltage circuit, low-pass filtering circuit and gain amplifying circuit;
Described reception diode is serially connected in the 2nd between predeterminated voltage and ground, the input terminus that the anode of described reception diode turns voltage circuit by described 2nd electric capacity with described electric current is connected, the input terminus of output terminal and described low-pass filtering circuit that described electric current turns voltage circuit is connected, the input terminus of described gain amplifying circuit is connected with the output terminal of described low-pass filtering circuit, and the output terminal of described gain amplifying circuit is as the output terminal of described front end receive circuit.
2. visible light communication front end circuit according to claim 1, it is characterized in that, described first amplification circuit comprises the first operational amplifier, described 2nd amplification circuit comprises the 2nd operational amplifier, and described first operational amplifier and described 2nd operational amplifier are the amplifier chip of OPA2670, OPA2673 or OPA2674.
3. visible light communication front end circuit according to claim 1, it is characterised in that, described LED is blue chip and yellow fluorescent powder mixed type LED or RGB three primary colours mixed type LED.
4. visible light communication front end circuit according to claim 1, it is characterised in that, described reception diode place is provided with condensor.
5. visible light communication front end circuit according to claim 1, it is characterised in that, also comprise the optical filtering eyeglass being arranged between described diode and described LED.
6. visible light communication front end circuit according to claim 1, it is characterised in that, described reception diode is SiPIN type LED or APD.
7. visible light communication front end circuit according to claim 1, it is characterised in that, described electric current turns the integrated circuit (IC) chip that voltage circuit comprises AD8015A.
8. visible light communication front end circuit according to claim 1, it is characterised in that, described front end receive circuit is also provided with metallic shield cover.
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| CN104363674B (en) * | 2014-10-09 | 2019-04-12 | 北京广厦网络技术股份公司 | LED light source driving circuit |
| FR3029373B1 (en) * | 2014-12-02 | 2018-01-12 | Sunpartner Technologies | ELECTRONIC DEVICE ASSOCIATED WITH A PHOTOVOLTAIC MODULE FOR OPTIMIZING THE FLOW OF A VLC TYPE BIDIRECTIONAL TRANSMISSION |
| CN105629147A (en) * | 2015-12-28 | 2016-06-01 | 清华大学 | LED carrier service life testing system |
| CN107135570B (en) * | 2017-04-18 | 2019-08-13 | 中国科学院半导体研究所 | The adjustable visible light communication LED light source of modulation bandwidth |
| CN107181526B (en) * | 2017-06-20 | 2023-04-18 | 东北大学 | Visible light wireless communication physical layer optical frequency modulator |
| CN107181525B (en) * | 2017-06-20 | 2023-07-14 | 东北大学 | Visible light wireless communication physical layer optical frequency demodulator |
| CN112702814B (en) * | 2020-12-21 | 2023-03-31 | 中国人民解放军战略支援部队信息工程大学 | Bias current optimization method and system based on LED electric heating model |
| CN114172577B (en) * | 2022-02-12 | 2022-05-10 | 南昌大学 | Indoor visible light communication system under optical fiber fusion |
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