CN205179057U - Receiving arrangement of visible light communication system based on white light LED - Google Patents
Receiving arrangement of visible light communication system based on white light LED Download PDFInfo
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Abstract
The utility model discloses a receiving arrangement of visible light communication system based on white light LED, including at least a set of light detection circuit, preceding equalizer circuit, preamplification circuit, post -equalization filter circuit, main amplifier circuit, demodulation circuit and output circuit, wherein, light detection circuit receives the light signal that sends based on white light LED's the emitter of visible light communication system, then light detection circuit can turn into faint current signal with this light signal, then pass through preceding equalizer circuit carries out the isostatic compensation to faint current signal, passes through again the preamplification circuit with post -equalization filter circuit amplifies and filtering, after the demodulation circuit restores into original analog electrical signal, through output circuit output. Therefore, the utility model discloses big and the little shortcoming of post -equalization transimpedance preamplification technique gain bandwidth of balanced transimpedance preamplification technique noise influence before can overcoming.
Description
Technical field
The utility model relates to the communications field, refers to a kind of receiving system of the visible light communication system based on white light LEDs especially.
Background technology
At present, as shown in Figure 1, the described visible light communication system based on white light LEDs, transform electrical signals can be light signal by emitter, then by optical channel and free space, light signal is sent to receiving system, the light signal with certain frequency received can be converted into raw electrical signal by last receiving system.Wherein, the core technology based on the receiving system of the visible light communication system of white light LEDs is photoelectric conversion technique, and the core of photoelectric conversion technique how photogenerated current is carried out noiseless amplification.
Existing photoelectric conversion technique has front balanced transimpedance enlarge leadingly technology and post-equalization transimpedance enlarge leadingly technology.Wherein, post-equalization transimpedance enlarge leadingly technology, after referring to that the light input signal electric current produced at photoelectric detector enters amplifier, frequency compensation is carried out to improve the bandwidth of circuit to signal transmission, and the position of introducing post-equalizer is between the output and the input of main amplifying circuit of transimpedance preamplifier.But this technology to there is gain little, the shortcoming that sensitivity is low.And, in post-equalization circuit, the noise that transimpedance pre-amplification circuit produces produces interference to signal code, and such input current signal intensity all cannot be recovered by frequency compensation lower than the frequency content of noise current, and namely the signal of HFS is all lost.
Front balanced transimpedance enlarge leadingly technology, before referring to that photoproduction input current enters amplifier, frequency compensation means are adopted to carry out equilibrium to input signal, make the radio-frequency component of signal do not have low below noise, or the noise in circuit does not also produce interference to input signal and is just come by compensation, obtain larger bandwidth, thus overcome the low bandwidth of preamplifier and high-frequency signal owing to losing excessive and shortcoming that is that cannot recover.Although the gain that front balanced transimpedance enlarge leadingly technology effectively improves the existence of post-equalization transimpedance amplifier optical pickup apparatus is little, the problem that sensitivity is low, but, the noise of optical receiver determines primarily of transimpedance front-end input stage, equalizer is added in the front end of transimpedance input stage, the noise that front equalizer produces can and input signal be exaggerated simultaneously, then the circuit structure of front equalizer and noise characteristic can cause very large impact to the signal to noise ratio of optical receiver system and sensitivity.Along with the increase of communication distance, described sensitivity, gain, bandwidth sum noise problem are more serious.
Utility model content
In view of this, the purpose of this utility model is the receiving system proposing a kind of visible light communication system based on white light LEDs, can overcome the shortcoming that the noise effect of front balanced transimpedance enlarge leadingly technology is large and post-equalization transimpedance enlarge leadingly technology gain bandwidth is little.
Based on the receiving system of the visible light communication system based on white light LEDs that above-mentioned purpose the utility model provides, comprise at least one group of optical detection circuit, pre-equalizing circuit, pre-amplification circuit, post-equalization filter circuit, main amplifying circuit, demodulator circuit and output circuit; Wherein, described optical detection circuit receives the light signal that the visible light communication system emitter based on white light LEDs sends, and then this light signal can be converted into low current signal by described optical detection circuit; Then by described pre-equalizing circuit, isostatic compensation is carried out to low current signal, then carry out amplifying and filtering through described pre-amplification circuit and described post-equalization filter circuit; After described main amplifying circuit is arranged on described post-equalization filter circuit, the voltage pulse signal that described pre-amplification circuit exports can be amplified to the level rank required for described demodulator circuit, be reduced into the original analog signal of telecommunication finally by described demodulator circuit, exported by described output circuit.
Alternatively, the receiving system of the described visible light communication system based on white light LEDs also comprises decision circuit, and this decision circuit one end is connected with described main amplifying circuit, and the other end is connected with described demodulator circuit;
Wherein, described decision circuit adopts voltage comparator implementation, the input anode series resistance R of voltage comparator
10and be connected with the signal that described main amplifying circuit transmits, the input cathode series resistance R of voltage comparator
15then voltage is connect, cross-over connection R between the input cathode of voltage comparator and output
16, coating-forming voltage negative feedback, meets a R between the power supply of voltage comparator and output
14, as protective resistance.
Alternatively, described optical detection circuit selects sensitive wave length to be the photodiode of 400nm-1100nm, and the ac equivalent circuit of described optical detection circuit is that an a current source Is and junction resistance R1 and junction capacitance C1 parallel connection forms a photodiode.
Further, described pre-equalizing circuit comprises the protective resistance (R1) of operational amplifier, filtering D.C. regulated power supply, resistance (R2), resistance (R3), electric capacity (C1), electric capacity (C2), electric capacity (C3), resistance (R4) and this pre-equalizing circuit;
Wherein, the protective resistance (R1) of pre-equalizing circuit as port protection resistance, the positive input terminal of one end concatenation operation amplifier, other end ground connection; The negative input end of one end concatenation operation amplifier of resistance (R2), other end ground connection; Resistance (R3) one end and resistance (R2) are also connected to the negative input end of operational amplifier, the output of other end concatenation operation amplifier; Electric capacity (C3) one end and resistance (R2), resistance (R3) be connected to the negative input end of operational amplifier, the output of other end concatenation operation amplifier; Resistance (R2), resistance (R3) and electric capacity (C3) form a frequency-selective network jointly; Resistance (R4) as port match resistance, the output of one end concatenation operation amplifier, the other end is as the input of described pre-amplification circuit network; Filtering D.C. regulated power supply is that operational amplifier is powered, and electric capacity (C1), electric capacity (C2), for filtering alternating current, are all connected with operational amplifier, and other end ground connection.
Further, described pre-amplification circuit is transimpedance pre-amplification circuit, the low current signal after pre-equalizing circuit is converted into the voltage pulse signal with amplitude.
Further, described pre-amplification circuit comprises filtering constant voltage dc source, first operational amplifier, second operational amplifier, resistance (R1), resistance (R2), resistance (R3), resistance (R4), resistance (R5), resistance (R6), resistance (R7), resistance (R8), resistance (R9), inductance element (L1), inductance element (L2), electric capacity (C1), electric capacity (C2), electric capacity (C3), electric capacity (C4), electric capacity (C5), electric capacity (C6), electric capacity (C7), electric capacity (C8) and electric capacity (C9),
Wherein, resistance (R9) and electric capacity (C8), electric capacity (C9) are connected the positive output end of first operational amplifier after connecting, the other end ground connection of resistance (R9); Resistance (R2) one end connects the positive input terminal of first operational amplifier, other end ground connection; One end of resistance (R1) connects the negative input end of first operational amplifier, other end ground connection; Resistance (R3) one end and resistance (R1) are also connected to the negative input end of first operational amplifier, and the other end connects the output of first operational amplifier; The first order that resistance (R1) and resistance (R3) form described pre-amplification circuit is amplified; Filtering constant voltage dc source is that first operational amplifier is powered, and electric capacity (C1), electric capacity (C2), for filtering alternating current, are connected with first operational amplifier all respectively, and the other end is ground connection respectively;
Resistance (R7) one end connects the output of first operational amplifier, and the other end connects the input of the filter network be made up of inductance element (L1), inductance element (L2), electric capacity (C3), electric capacity (C4), electric capacity (C5); Wherein, electric capacity (C4) one end ground connection, the other end connects inductance element (L1) front one end, and rear one end of inductance element (L1) connects electric capacity (C3), the other end ground connection of electric capacity (C3); The parallel connection of electric capacity (C4), inductance element (L1), electric capacity (C3) forms the first rank ∏ type filter network; Front one end of inductance element (L2) connects electric capacity (C3), and rear one end connects electric capacity (C5), the other end ground connection of electric capacity (C5); The parallel connection of electric capacity (C3), inductance element (L2), electric capacity (C5) forms second-order ∏ type filter network;
Electric capacity (C6) one end connects the positive input terminal of second operational amplifier, other end ground connection; One end of resistance (R4) connects the negative input end of second operational amplifier, other end ground connection; Resistance (R5) one end and resistance (R4) are also connected to the negative input end of second operational amplifier, and the other end connects the output of second operational amplifier; Filtering constant voltage dc source is that second operational amplifier is powered; Electric capacity (C1), electric capacity (C2) are for filtering alternating current, and one end connects the port of second operational amplifier respectively, other end ground connection; Resistance (R8) one end connects the output of second operational amplifier, and the other end is as the input of described post-equalization filter circuit.
Alternatively, described post-equalization filter circuit adopts three electric capacity C
1c
2c
3with two inductance L
1l
2form the second-order filter equalizing circuit of a π type.
Alternatively, described main amplifying circuit adopts the degenerative mode of multi-cascade, the voltage pulse signal that described pre-amplification circuit exports is amplified to the level rank required for back end signal process.
Further, described output circuit employing data line is received on keyset and is formed.
As can be seen from above, the receiving system of the visible light communication system based on white light LEDs that the utility model provides, the light signal sent by optical detection circuit receiving and transmitting unit is also converted into low current signal, then by pre-equalizing circuit, isostatic compensation is carried out to low current signal, carry out amplifying and filtering through pre-amplification circuit and post-equalization filter circuit again, be reduced into the original analog signal of telecommunication finally by demodulator circuit, exported by output circuit.Thus the receiving system of the visible light communication system of the described LED based on white light under the prerequisite of not sacrificing gain, sensitivity and bandwidth, can reduce noise impact to received signal.
Accompanying drawing explanation
Fig. 1 is the structural representation based on the visible light communication system of white light LEDs in prior art;
Fig. 2 is the structural representation of the utility model embodiment based on the receiving system of the visible light communication system of white light LEDs;
Fig. 3 is the structural representation of the ac equivalent circuit of the utility model embodiment optical detection circuit;
Fig. 4 is the structural representation of the utility model embodiment pre-equalizing circuit;
Fig. 5 is the structural representation of the utility model embodiment pre-amplification circuit;
Fig. 6 is the structural representation of the utility model embodiment main amplifying circuit;
Fig. 7 is the structural representation of the utility model embodiment decision circuit.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described.
In an embodiment of the present utility model, as shown in Figure 2, for the utility model embodiment is based on the structural representation of the receiving system of the visible light communication system of white light LEDs.The receiving system of the described visible light communication system based on white light LEDs comprises: optical detection circuit 1, pre-equalizing circuit 2, pre-amplification circuit 3, post-equalization filter circuit 4, main amplifying circuit 5, demodulator circuit 7 and output circuit 8.Preferably, this receiving system also comprises decision circuit 6.Wherein, optical detection circuit 1 can receive the light signal that the visible light communication system emitter based on white light LEDs sends, and then this light signal can be converted into low current signal by optical detection circuit 1.Then isostatic compensation is carried out by pre-equalizing circuit 2 pairs of low current signals, carry out amplifying and filtering through pre-amplification circuit 3 and post-equalization filter circuit 4 again, be reduced into the original analog signal of telecommunication finally by decision circuit 6 and demodulator circuit 7, exported by output circuit 8.
What deserves to be explained is, the receiving system of the visible light communication system based on white light LEDs described in the utility model can be at least comprise an optical detection circuit 1, pre-equalizing circuit 2, pre-amplification circuit 3, post-equalization filter circuit 4, main amplifying circuit 5, decision circuit 6, demodulator circuit 7 and an output circuit 8.Only illustrate described receiving system in the above embodiments and comprise one group of foregoing circuit, certain described receiving system can also comprise two groups, three groups or more foregoing circuit.
Preferably, the light signal with certain frequency received is converted into current signal by optical detection circuit 1, and this current signal is generally μ A magnitude.Preferably, optical detection circuit 1 selects photodiode, according to the principle of luminosity of the LED that the utility model is selected, selects the sensitive wave length scope of photodiode to be about 400-1100nm.Photodiode is actually a current source, but its output impedance is limited very large, its ac equivalent circuit figure, as shown in Figure 3; An a current source Is and one junction resistance R1 and junction capacitance C1 parallel connection forms a photodiode.
I
sbe the electric current of response incident optical signal, their pass is:
I
S＝sP
i
P
ibe the luminous power (W) incided on photodiode effective area, s is the sensitivity (A/W) of photodiode to lambda1-wavelength.Within the specific limits.Signal code I
slinear relative to incident light.
In another embodiment of the present utility model, pre-equalizing circuit 2 position of described receiving system is in the front end of pre-amplification circuit 3, before also namely photoproduction input current enters pre-amplification circuit 3, utilizes the parasitic capacitance C of photoelectric detective circuit 1
dwith the input capacitance C of pre-amplification circuit 3
iwith input resistance R
iisostatic compensation circuit before forming.The specific embodiment of described pre-equalizing circuit 2 is, consult shown in Fig. 4: an operational amplifier and two resistance R2, R3 forms a preposition mutual impedance voltage negative feedback circuit, is here amplified by the photogenerated current signal that photoelectric detector 1 produces, R3 and C3 forms a selecting frequency filtering network.R1 is protective resistance, and R4 is the build-out resistor of circuit output end, and the effect of C1 and C2 is the AC signal of filtering D.C. regulated power supply.
Described pre-equalizing circuit 2 is for compensating frequency, namely frequency compensation means are adopted to carry out equilibrium to photogenerated current signal, make the radio-frequency component of signal do not have low below noise, or the noise in circuit does not also produce interference to photogenerated current signal and is just come by compensation, obtain larger bandwidth, thus overcome the low bandwidth of pre-amplification circuit 3 and high-frequency signal owing to losing excessive and shortcoming that is that cannot recover.Preferably, the compensating frequency of pre-equalizing circuit 2 is:
As an embodiment of the present utility model, described pre-amplification circuit 3 is designed to transimpedance pre-amplification circuit.Preferably, described pre-amplification circuit 3 adopts the mode of negative voltage feedback, low current signal after pre-equalizing circuit 2 is converted into the voltage pulse signal with certain amplitude, here an all-pass filter is equivalent to, exchange the raising of circuit gain with the bandwidth of sacrifice circuit for, but effectively raise the sensitivity of circuit.As follows:
Wherein, A
ffor negative feedback gain, A is open-loop gain, and F is depth of feedback, and S is sensitivity, R
ffor feedback resistance, R
ifor the input resistance of pre-amplification circuit 3.Therefore, feedback resistance is larger, and depth of feedback is darker, and the feedback oscillator of circuit is larger, and cost is that the sensitivity of circuit declines.Thus while improving feedback oscillator, must take into account the sensitivity of circuit, the feedback resistance of pre-amplification circuit 3 can not be too large.
What deserves to be explained is, concrete being implemented as follows (as shown in Figure 5) of described pre-amplification circuit 3: first operational amplifier and R1 and R3 form preposition mutual impedance negative voltage feedback amplifying circuit, the faint photogenerated current signal produced through photoelectric detective circuit 1 obtains first time here and amplifies, and sends out large multiple and can be obtained by the resistance of adjustment R3 as required.R6, R7, R8, R9 are the build-out resistor of circuit; L1, L2, C3, C4, C5 form the second-order filter network of a Π type, by other noise clutter filterings.
Second operational amplifier and R4, R5 form the main amplifying circuit of negative voltage feedback, and here photogenerated current signal obtains secondary amplification, makes it reach circuit required voltage amplitude below, and R5 resistance can be regulated to obtain the multiplication factor needed; C1, C2, C6, C7 can the AC signal of filtering constant voltage dc source; C8, C9 and R2 form simple RC filter network, the clutter other be mixed into before the faint photogenerated current signal produced through photoelectric detective circuit is not exaggerated and noise filtering.
As another embodiment of the present utility model, post-equalization filter circuit 4 position of described receiving system is between the output and the input of main amplifying circuit 5 of pre-amplification circuit 3.Preferably, post-equalization filter circuit 4 adopts three electric capacity C
1c
2c
3with two inductance L
1l
2form the second-order filter equalizing circuit of a π type.Therefore, other the interference noise that filters of post-equalization filter circuit 4 noise that filtering is produced through pre-equalizing circuit 2 and failing.In addition, post-equalization filter circuit 4 can carry out the bandwidth that secondary expands signal simultaneously, as follows:
In addition, in embodiment of the present utility model, in order to obtain the higher sensitivity of wider bandwidth sum, the feedback resistance of pre-amplification circuit 3 can not be excessive, and the voltage pulse signal that pre-amplification circuit 3 exports is amplified to the level rank required for back end signal process by the main amplifying circuit 5 of described receiving system.Preferably, main amplifying circuit 5, while the voltage pulse signal exported by pre-amplification circuit 3 is amplified to the level rank required for back end signal process, ensures the undistorted transmission of signal.Preferably, described main amplifying circuit 5 adopts the degenerative mode of multi-cascade, and as shown in Figure 6, voltage gain can reach millions of times.
In an embodiment of the present utility model, the decision circuit 6 of described receiving system can adjudicate whether the signal exported through main amplifying circuit 5 is the data-signal transmitted.Preferably, decision circuit 6 adopts voltage comparator implementation.It should be noted that, decision circuit 6 is not limited to described voltage comparator.Preferably, decision circuit 6 is adjudicated while whether signal that described receiving system receives is the code signal that sends of described transmitting terminal and can be played shaping operation.Consult shown in Fig. 7, the input anode series resistance R of voltage comparator
10and be connected with the signal that main amplifying circuit 5 transmits, the input cathode series resistance R of voltage comparator
15then voltage is connect, cross-over connection R between the input cathode of voltage comparator and output
16, coating-forming voltage negative feedback, meets a R between the power supply of voltage comparator and output
14, as protective resistance.
Preferably, the demodulator circuit 7 of described receiving system can gather the digital signal of described decision circuit 6 output and demodulation is reduced into analog electrical signal, then exports the analog signal after reduction according to the communication protocol of definition.Wherein, communication protocol refers to the communication protocol between emitter and receiving system, and be exactly that transmitting terminal is launched according to this protocol standard transmission data-signal, receiving terminal is just according to this agreement receiving demodulation.
Preferably, demodulator circuit 7 can adopt simple D/A converting circuit.
As embodiment, the analog electrical signal after demodulator circuit 7 can reduce by output circuit 8 outputs to extraneous terminal.Wherein, the analog electrical signal after reduction can be word, music, video etc.Preferably, output circuit 8 adopts data line to receive on keyset to form.
In sum, the receiving system of the visible light communication system based on white light LEDs that the utility model provides, creatively propose a kind of receiving system relating to employing pre-and-post equalization mutual impedance enlarge leadingly, effectively overcome the deficiency of front balancing technique and post-equalization technology, there is noise little, high sensitivity, high bandwidth, the advantage of high-gain; And, both overcome the problem that front balanced transimpedance amplifying circuit noise jamming is large, effectively solve again the problem that post-equalization transimpedance amplifying circuit bandwidth, gain and insufficient sensitivity are high; Meanwhile, receiving system has the sensitivity that very wide bandwidth sum is very high, and circuitry operative is strong, and structure is simple, and cost is low; When not increasing the difficulty of circuit design and preparation technology, by the receiving system of pre-and-post equalization transimpedance enlarge leadingly, realizing the visible light communication system based on white light LEDs, having great actual application value; Finally, the receiving system of the whole described visible light communication system based on white light LEDs is easy, compact, is easy to realize.
Those of ordinary skill in the field are to be understood that: the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle; any amendment of making, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. based on a receiving system for the visible light communication system of white light LEDs, it is characterized in that, comprise at least one group of optical detection circuit, pre-equalizing circuit, pre-amplification circuit, post-equalization filter circuit, main amplifying circuit, demodulator circuit and output circuit; Wherein, described optical detection circuit receives the light signal that the visible light communication system emitter based on white light LEDs sends, and then this light signal can be converted into low current signal by described optical detection circuit; Then by described pre-equalizing circuit, isostatic compensation is carried out to low current signal, then carry out amplifying and filtering through described pre-amplification circuit and described post-equalization filter circuit; After described main amplifying circuit is arranged on described post-equalization filter circuit, the voltage pulse signal that described pre-amplification circuit exports can be amplified to the level rank required for described demodulator circuit, be reduced into the original analog signal of telecommunication finally by described demodulator circuit, exported by described output circuit.
2. receiving system according to claim 1, is characterized in that, the receiving system of the described visible light communication system based on white light LEDs also comprises decision circuit, and this decision circuit one end is connected with described main amplifying circuit, and the other end is connected with described demodulator circuit;
Wherein, described decision circuit adopts voltage comparator implementation, the input anode series resistance R of voltage comparator
10and be connected with the signal that described main amplifying circuit transmits, the input cathode series resistance R of voltage comparator
15then voltage is connect, cross-over connection R between the input cathode of voltage comparator and output
16, coating-forming voltage negative feedback, meets a R between the power supply of voltage comparator and output
14, as protective resistance.
3. receiving system according to claim 1, it is characterized in that, described optical detection circuit selects sensitive wave length to be the photodiode of 400nm-1100nm, and the ac equivalent circuit of described optical detection circuit is that an a current source Is and junction resistance R1 and junction capacitance C1 parallel connection forms a photodiode.
4. receiving system according to claim 3, it is characterized in that, described pre-equalizing circuit comprises the protective resistance R1 of operational amplifier, filtering D.C. regulated power supply, resistance R2, resistance R3, electric capacity C1, electric capacity C2, electric capacity C3, resistance R4 and this pre-equalizing circuit;
Wherein, the protective resistance R1 of pre-equalizing circuit as port protection resistance, the positive input terminal of one end concatenation operation amplifier, other end ground connection; The negative input end of one end concatenation operation amplifier of resistance R2, other end ground connection; Resistance R3 one end and resistance R2 are also connected to the negative input end of operational amplifier, the output of other end concatenation operation amplifier; Electric capacity C3 one end and resistance R2, resistance R3 are also connected to the negative input end of operational amplifier, the output of other end concatenation operation amplifier; Resistance R2, resistance R3 and electric capacity C3 form a frequency-selective network jointly; Resistance R4 as port match resistance, the output of one end concatenation operation amplifier, the other end is as the input of described pre-amplification circuit network; Filtering D.C. regulated power supply is that operational amplifier is powered, and electric capacity C1, electric capacity C2 are used for filtering alternating current, are all connected with operational amplifier, and other end ground connection.
5. receiving system according to claim 4, is characterized in that, described pre-amplification circuit is transimpedance pre-amplification circuit, the low current signal after pre-equalizing circuit is converted into the voltage pulse signal with amplitude.
6. receiving system according to claim 5, it is characterized in that, described pre-amplification circuit comprises filtering constant voltage dc source, first operational amplifier, second operational amplifier, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, inductance component L 1, inductance component L 2, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8 and electric capacity C9;
Wherein, the positive output end of first operational amplifier is connected after resistance R9 and electric capacity C8, electric capacity C9 connect, the other end ground connection of resistance R9; Resistance R2 one end connects the positive input terminal of first operational amplifier, other end ground connection; One end of resistance R1 connects the negative input end of first operational amplifier, other end ground connection; Resistance R3 one end and resistance R1 are also connected to the negative input end of first operational amplifier, and the other end connects the output of first operational amplifier; The first order that resistance R1 and resistance R3 forms described pre-amplification circuit is amplified; Filtering constant voltage dc source is that first operational amplifier is powered, and electric capacity C1, electric capacity C2 are used for filtering alternating current, are connected all respectively with first operational amplifier, and the other end is ground connection respectively;
Resistance R7 one end connects the output of first operational amplifier, and the other end connects the input of the filter network be made up of inductance component L 1, inductance component L 2, electric capacity C3, electric capacity C4, electric capacity C5; Wherein, electric capacity C4 one end ground connection, the other end connects the front one end of inductance component L 1, and rear one end of inductance component L 1 connects electric capacity C3, the other end ground connection of electric capacity C3; Electric capacity C4, inductance component L 1, electric capacity C3 parallel connection forms the first rank ∏ type filter network; Front one end of inductance component L 2 connects electric capacity C3, and rear one end connects electric capacity C5, the other end ground connection of electric capacity C5; Electric capacity C3, inductance component L 2, electric capacity C5 parallel connection forms second-order ∏ type filter network;
Electric capacity C6 one end connects the positive input terminal of second operational amplifier, other end ground connection; One end of resistance R4 connects the negative input end of second operational amplifier, other end ground connection; Resistance R5 one end and resistance R4 are also connected to the negative input end of second operational amplifier, and the other end connects the output of second operational amplifier; Filtering constant voltage dc source is that second operational amplifier is powered; Electric capacity C1, electric capacity C2 are used for filtering alternating current, and one end connects the port of second operational amplifier respectively, other end ground connection; Resistance R8 one end connects the output of second operational amplifier, and the other end is as the input of described post-equalization filter circuit.
7. receiving system according to claim 1, is characterized in that, described post-equalization filter circuit adopts three electric capacity C
1c
2c
3with two inductance L
1l
2form the second-order filter equalizing circuit of a π type.
8. receiving system according to claim 1, is characterized in that, described main amplifying circuit adopts the degenerative mode of multi-cascade, the voltage pulse signal that described pre-amplification circuit exports is amplified to the level rank required for back end signal process.
9. the receiving system according to claim 1-8 any one, is characterized in that, described output circuit employing data line is received on keyset and formed.
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| CN110278040A (en) * | 2019-06-28 | 2019-09-24 | 江苏北方湖光光电有限公司 | A kind of high speed weak optical signal receiving module |
| CN111934765A (en) * | 2020-06-15 | 2020-11-13 | 中山大学 | Receiving front-end circuit of visible light communication system |
| CN114172577A (en) * | 2022-02-12 | 2022-03-11 | 南昌大学 | Indoor visible light communication system under optical fiber fusion |
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- 2015-08-20 CN CN201520633671.1U patent/CN205179057U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108234021A (en) * | 2017-12-28 | 2018-06-29 | 南京邮电大学 | A kind of audio receiving system based on Quantum Well diode component |
| CN110278040A (en) * | 2019-06-28 | 2019-09-24 | 江苏北方湖光光电有限公司 | A kind of high speed weak optical signal receiving module |
| CN110278040B (en) * | 2019-06-28 | 2023-08-15 | 江苏北方湖光光电有限公司 | High-speed weak light signal receiving module |
| CN111934765A (en) * | 2020-06-15 | 2020-11-13 | 中山大学 | Receiving front-end circuit of visible light communication system |
| CN111934765B (en) * | 2020-06-15 | 2023-04-28 | 中山大学 | Receiving front-end circuit of visible light communication system |
| CN114172577A (en) * | 2022-02-12 | 2022-03-11 | 南昌大学 | Indoor visible light communication system under optical fiber fusion |
| 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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