CN105227245B - A kind of reception device of the visible light communication system based on white light LEDs - Google Patents
A kind of reception device of the visible light communication system based on white light LEDs Download PDFInfo
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- CN105227245B CN105227245B CN201510515892.3A CN201510515892A CN105227245B CN 105227245 B CN105227245 B CN 105227245B CN 201510515892 A CN201510515892 A CN 201510515892A CN 105227245 B CN105227245 B CN 105227245B
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Abstract
The invention discloses a kind of reception device of the visible light communication system based on white light LEDs, including at least one set of optical detection circuit, pre-equalizing circuit, pre-amplification circuit, post-equalization filter circuit, main amplifying circuit, demodulator circuit and output circuit；Wherein, the optical detection circuit receives the optical signal that the visible light communication system emitter based on white light LEDs is sent, and then the optical signal can be converted into low current signal by the optical detection circuit；Then isostatic compensation is carried out to low current signal by the pre-equalizing circuit, it is amplified and filters through the pre-amplification circuit and the post-equalization filter circuit again, original analog electric signal most is reduced into through the demodulator circuit afterwards, is exported by the output circuit.Therefore, the present invention can overcome the preposition amplifying technique influence of noise of preceding balanced transimpedance big and the small shortcoming of the preposition amplifying technique gain bandwidth of post-equalization transimpedance.
Description
Technical field
The present invention relates to the communications field, a kind of reception device of the visible light communication system based on white light LEDs is particularly related to.
Background technology
At present, as shown in figure 1, the visible light communication system based on white light LEDs, emitter can turn electric signal
Optical signal is turned to, is then that optical signal is sent to reception device by free space by optical channel, last reception device can
The optical signal with certain frequency of reception is converted into raw electrical signal.Wherein, the visible light communication system based on white light LEDs
The core technology of reception device be photoelectric conversion technique, and the core of photoelectric conversion technique is how photogenerated current to be carried out into nothing
Noise amplifies.
Existing the photoelectric conversion technique balanced preposition amplifying technique of transimpedance and the preposition amplification skill of post-equalization transimpedance before having
Art.Wherein, the preposition amplifying technique of post-equalization transimpedance, refers to enter in the light input signal electric current produced by photoelectric detector and puts
After big device, frequency compensation is carried out to improve the bandwidth of circuit to transmission signal, and the position for introducing post-equalizer is across resistance
Between the output end of anti-preamplifier and the input of main amplifying circuit.But this technology has that gain is small, sensitivity is low
Shortcoming.Also, in post-equalization circuit, the noise that transimpedance pre-amplification circuit is produced has produced dry to signal code
Disturb, such input current signal intensity can not be recovered less than the frequency content of noise current by frequency compensation, i.e. radio-frequency head
The signal divided is lost.
The preceding preposition amplifying technique of balanced transimpedance, refers to that photoproduction input current enters before amplifier, using frequency compensation
Means input signal is carried out it is balanced, make the radio-frequency component of signal in the not low noise to below noise, or in circuit also
Do not produce interference to input signal just by compensation to be come, obtain bigger bandwidth, thus overcome preamplifier low bandwidth and
High-frequency signal is due to losing shortcoming excessive to recover.The preceding preposition amplifying technique of balanced transimpedance is equal after being although effectively improved
The gain that the transimpedance amplifier optical pickup apparatus of weighing is present is small, the problem of sensitivity is low, still, the noise of photoreceiver it is main by
Transimpedance front-end input stage determines, adds balanced device in the front end of transimpedance input stage, the noise that preceding balanced device is produced can and it is defeated
Enter signal to be exaggerated simultaneously, then signal to noise ratio and sensitivity meeting of the circuit structure and noise characteristic of preceding balanced device to optical receiver system
Cause very big influence.With the increase of communication distance, described sensitivity, gain, bandwidth and noise problem are more serious.
The content of the invention
In view of this, it is an object of the invention to propose a kind of reception dress of visible light communication system based on white light LEDs
Put, the preposition amplifying technique influence of noise of preceding balanced transimpedance can be overcome big and the preposition amplifying technique gain band of post-equalization transimpedance
Wide small shortcoming.
The reception device of the visible light communication system based on white light LEDs provided based on the above-mentioned purpose present invention, including extremely
Few 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, the optical detection circuit receives the light letter that the visible light communication system emitter based on white light LEDs is sent
Number, then the optical signal can be converted into low current signal by the optical detection circuit；Then the pre-equalizing circuit is passed through
Isostatic compensation is carried out to low current signal, then be amplified through the pre-amplification circuit and the post-equalization filter circuit and
Filtering, is most reduced into original analog electric signal through the demodulator circuit afterwards, is exported by the output circuit.
Alternatively, the reception device of the visible light communication system based on white light LEDs also includes decision circuit, the judgement
Circuit on one side is connected with the main amplifying circuit, and the other end is connected with the demodulator circuit；Also, the decision circuit can be sentenced
Whether the signal certainly exported through the main amplifying circuit is the data-signal and shaping transmitted.
Further, the decision circuit uses voltage comparator implementation, the input anode string of voltage comparator
Join resistance R10And be connected with the signal that the main amplifying circuit is transmitted, the input cathode series resistance R of voltage comparator15So
Voltage is followed by, a R is bridged between the input cathode and output end of voltage comparator16, formed negative voltage feedback, voltage ratio compared with
Between the power supply and output end of device and meet a R14, it is used as protective resistance.
Alternatively, described optical detection circuit selects photodiode, the ac equivalent circuit of described optical detection circuit
It is that an a current source Is and junction resistance R1 and a junction capacity C1 parallel connection constitute a photodiode.
Further, the pre-equalizing circuit utilizes the parasitic capacitance C of photoelectric detective circuit 1dWith pre-amplification circuit
Input capacitance CiWith input resistance RiPreceding isostatic compensation circuit is constituted, the compensation frequency of pre-equalizing circuit 2 is：
Further, the Pre-amplifier Circuit Design is transimpedance pre-amplification circuit, will be after pre-equalizing circuit
Low current signal be converted into the voltage pulse signal with certain amplitude.
Further, the pre-amplification circuit includes first operational amplifier and the preposition mutual impedance electricity of R1 and R3 compositions
Negative feedback amplifier circuit is pressed, the faint photogenerated current signal produced through photoelectric detective circuit 1 obtains amplifying for the first time herein,
R6, R7, R8, R9 are the build-out resistor of circuit；L1, L2, C3, C4, C5 constitute the second-order filter network of a ∏ type, and other are made an uproar
Sound clutter is filtered out；Second operational amplifier and R4, R5 constitute the main amplifying circuit of negative voltage feedback, and photogenerated current is believed herein
Number secondary amplification is obtained, reach circuit required voltage amplitude below；C1, C2, C6, C7 filter out the friendship of constant voltage dc source
Flow signal；C8, C9 and R2 constitute RC filter networks, are not put in the faint photogenerated current signal produced through photoelectric detective circuit
The clutter and noise filtering for being mixed into other before big.
Alternatively, the post-equalization filter circuit is using three electric capacity C1C2C3With two inductance L1L2One π type of composition
Second-order filter equalizing circuit, the other interference noises that the noise produced through pre-equalizing circuit will be filtered out with fail to filter, and
Post-equalization filter circuit carries out the bandwidth of secondary expansion signal simultaneously, as follows：
Wherein, L=L1//L2, C=C1//C2//C3。
Alternatively, the main amplifying circuit is exported the pre-amplification circuit by the way of multi-cascade negative-feedback
Voltage pulse signal is amplified to the level rank required for back end signal processing.
Further, the demodulator circuit includes acquisition processing module and D/A modular converters, and the acquisition processing module will
The data signal of the decision circuit transmission is acquired, and is then sent to the D/A modular converters, the D/A modular converters
It is then analog electrical signal by the digital signal transition of collection, finally transmits the analog electrical signal by the acquisition processing module
To the output circuit；
The demodulator circuit also includes display screen, and the display screen is connected with acquisition processing module, by the acquisition process mould
The operating result of block and the D/A modular converters is shown；In addition it is possible to by the display screen to the acquisition process
The signal transacting of module and the D/A modular converters is controlled, assigns instruction；
The demodulator circuit further comprises the system clock module being connected with the acquisition processing module, and described is
System clock module is controlled to the time of the acquisition processing module and the D/A modular converters；In addition, the acquisition process
Module and the D/A modular converters show various time-triggered protocols in the system clock module.
From the above it can be seen that the reception device for the visible light communication system based on white light LEDs that the present invention is provided,
The optical signal that is sent by optical detection circuit receiving and transmitting unit is simultaneously converted into low current signal, then passes through pre-equalizing circuit
Isostatic compensation is carried out to low current signal, then is amplified and filters through pre-amplification circuit and post-equalization filter circuit, most
Original analog electric signal is reduced into by demodulator circuit, is exported by output circuit.So as to which the LED's based on white light can
See that the reception device of optical communication system can be reduced noise docking and collected mail on the premise of gain, sensitivity and bandwidth is not sacrificed
Number influence.
Brief description of the drawings
Fig. 1 is the structural representation of the visible light communication system based on white light LEDs in the prior art；
Fig. 2 is the structural representation of the reception device of visible light communication system of the embodiment of the present invention based on white light LEDs；
Fig. 3 is the structural representation of the ac equivalent circuit of optical detection circuit of the embodiment of the present invention；
Fig. 4 is the structural representation of pre-equalizing circuit of the embodiment of the present invention；
Fig. 5 is the structural representation of pre-amplification circuit of the embodiment of the present invention；
Fig. 6 is the structural representation of main amplifying circuit of the embodiment of the present invention；
Fig. 7 is the structural representation of decision circuit of the embodiment of the present invention；
Fig. 8 is the structural representation of demodulator circuit of the embodiment of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.
In one embodiment of the invention, as shown in Fig. 2 logical for visible ray of the embodiment of the present invention based on white light LEDs
The structural representation of the reception device of letter system.The reception device of the visible light communication system based on white light LEDs includes：Light
Detect circuit 1, pre-equalizing circuit 2, pre-amplification circuit 3, post-equalization filter circuit 4, main amplifying circuit 5, demodulator circuit 7 and defeated
Go out circuit 8.It is preferred that the reception device also includes decision circuit 6.Wherein, optical detection circuit 1 can be received based on white light LEDs
Visible light communication system emitter send optical signal, then optical detection circuit 1 optical signal can be converted into faint
Current signal.Then isostatic compensation is carried out to low current signal by pre-equalizing circuit 2, then through pre-amplification circuit 3 with after
Equalization filtering circuit 4 is amplified and filtered, and is most reduced into original analog electric signal through decision circuit 6 and demodulator circuit 7 afterwards, leads to
Output circuit 8 is crossed to export.
What deserves to be explained is, the reception device of the visible light communication system of the present invention based on white light LEDs can be
At least include optical detection circuit 1, pre-equalizing circuit 2, pre-amplification circuit 3, a post-equalization filter circuit
4th, a main amplifying circuit 5, a decision circuit 6, a demodulator circuit 7 and an output circuit 8.In the above embodiments
Only illustrating the reception device includes one group of foregoing circuit, and certain reception device can also include two groups, three groups
Or more foregoing circuits.
It is preferred that the optical signal with certain frequency received is converted into current signal by optical detection circuit 1, this electric current
Signal is generally μ A magnitudes.Preferably, optical detection circuit 1 selects photodiode, the LED selected according to the present invention luminous original
Reason, the sensitive wave length scope from photodiode is 400-1100nm or so.Photodiode is actually a current source,
Its output impedance is limited but very big, its ac equivalent circuit figure, as shown in Figure 3；One current source Is and a knot electricity
R1 and junction capacity C1 parallel connection of resistance constitutes a photodiode.
ISThe electric current of incident optical signal is in response to, their relation is：
IS=sPi
PiIt is to incide the luminous power (W) on photodiode effective area, s is photodiode to lambda1-wavelength
Sensitivity (A/W).Within the specific limits.Signal code ISIt is linear relative to incident light.
In another embodiment of the present invention, the position of pre-equalizing circuit 2 of the reception device is in preposition amplification electricity
The front end on road 3, namely photoproduction input current enter before pre-amplification circuit 3, utilize the parasitic capacitance C of photoelectric detective circuit 1d
With the input capacitance C of pre-amplification circuit 3iWith input resistance RiIsostatic compensation circuit before constituting.The tool of the pre-equalizing circuit 2
Body embodiment is, refering to shown in Fig. 4：One operational amplifier and two resistance R2, R3 constitute a preposition mutual impedance voltage negative
The photogenerated current signal that photoelectric detector 1 is produced, is amplified by feedback circuit herein, and R3 and C3 constitute a frequency-selective filtering
Network.R1 is protective resistance, and R4 is the build-out resistor of circuit output end, and C1 and C2 effect are the friendships for filtering out D.C. regulated power supply
Flow signal.
Described pre-equalizing circuit 2 is used to compensate frequency, i.e., using frequency compensation means to photogenerated current signal
Carry out balanced, the radio-frequency component of signal is not believed in the not low noise to below noise, or in circuit photogenerated current also
Number produce interference is just come by compensation, bigger bandwidth is obtained, so as to overcome the low bandwidth and high-frequency signal of pre-amplification circuit 3
Due to losing shortcoming excessive to recover.Preferably, the compensation frequency of pre-equalizing circuit 2 is：
As one embodiment of the present of invention, the pre-amplification circuit 3 is designed as transimpedance pre-amplification circuit.Preferably
Ground, the pre-amplification circuit 3 is turned the low current signal after pre-equalizing circuit 2 by the way of negative voltage feedback
The voltage pulse signal with certain amplitude is turned to, equivalent to one all-pass filter, is changed with the bandwidth of sacrifice circuit here
The raising of sense circuit gain, but effectively raise the sensitivity of circuit.It is as follows：
Wherein, AfFor negative-feedback gain, A is open-loop gain, and F is depth of feedback, and S is sensitivity, RfFor feedback resistance, Ri
For the input resistance of pre-amplification circuit 3.Therefore, feedback resistance is bigger, and depth of feedback is deeper, and the feedback oscillator of circuit is bigger,
Cost is that the sensitivity of circuit declines.So as to while improving feedback oscillator, it is necessary to take into account the sensitivity of circuit, preposition amplification
The feedback resistance of circuit 3 can not be too big.
What deserves to be explained is, the pre-amplification circuit 3 specifically implements following (as shown in Figure 5)：First computing is put
Big device constitutes preposition mutual impedance negative voltage feedback amplifying circuit with R1 and R3, the faint photoproduction produced through photoelectric detective circuit 1
Current signal is obtained amplifying for the first time herein, and sending out multiple big can be obtained by adjusting R3 resistance as needed.R6, R7,
R8, R9 are the build-out resistor of circuit；L1, L2, C3, C4, C5 constitute the second-order filter network of a ∏ type, by other noise clutters
Filter out.
Second operational amplifier and R4, R5 constitute the main amplifying circuit of negative voltage feedback, herein photogenerated current signal
Secondary amplification is obtained, circuit required voltage amplitude below is reached, the multiplication factor that R5 resistances are needed can be adjusted；
C1, C2, C6, C7 can filter out the AC signal of constant voltage dc source；C8, C9 and R2 constitute simple RC filter networks, in warp
Clutter and noise filtering that other are mixed into by the faint photogenerated current signal that photoelectric detective circuit is produced before not being exaggerated.
As an alternative embodiment of the invention, the position of post-equalization filter circuit 4 of the reception device is put preceding
Greatly between the output end of circuit 3 and the input of main amplifying circuit 5.It is preferred that post-equalization filter circuit 4 is using three electric capacity
C1C2C3With two inductance L1L2Constitute the second-order filter equalizing circuit of a π type.Therefore, post-equalization filter circuit 4 will filter out through
The noise that pre-equalizing circuit 2 is produced and the other interference noises for failing to filter.In addition, post-equalization filter circuit 4 simultaneously can be with
The secondary bandwidth for expanding signal is carried out, it is as follows：
In addition, in an embodiment of the present invention, in order to obtain the sensitivity of broader bandwidth and Geng Gao, pre-amplification circuit
3 feedback resistance can not be excessive, and the voltage pulse that the main amplifying circuit 5 of the reception device exports pre-amplification circuit 3 is believed
Number it is amplified to the level rank required for back end signal processing.It is preferred that main amplifying circuit 5 is exported by pre-amplification circuit 3
Voltage pulse signal be amplified to back end signal processing required for level rank while, it is ensured that the undistorted transmission of signal.
Preferably, described main amplifying circuit 5 is by the way of multi-cascade negative-feedback, as shown in fig. 6, voltage gain can reach hundreds of
Wan Bei.
In one embodiment of the invention, the decision circuit 6 of the reception device can adjudicate defeated through main amplifying circuit 5
Whether the signal gone out is the data-signal transmitted.It is preferred that decision circuit 6 uses voltage comparator implementation.Need explanation
, decision circuit 6 is not limited to described voltage comparator.Preferably, decision circuit 6 is adjudicated the reception device and received
Signal whether be transmitting terminal transmission come encoded signal while can play shaping operation.As shown in fig.7, voltage
The input anode series resistance R of comparator10And be connected with the signal that main amplifying circuit 5 is transmitted, the input of voltage comparator
Negative pole series resistance R15Then voltage is connect, a R is bridged between the input cathode and output end of voltage comparator16, form electricity
Negative-feedback is pressed, between the power supply and output end of voltage comparator and a R is met14, it is used as protective resistance.
It is preferred that the demodulator circuit 7 of the reception device can gather data signal and the solution that the decision circuit 6 is exported
Tune is reduced into analog electrical signal, further according to the analog signal after the communication protocol output reduction of definition.Wherein, communication protocol refers to
Communication protocol between emitter and reception device, is exactly that transmitting terminal is launched according to this protocol standard transmission data-signal,
Receiving terminal is just received according to this agreement and demodulated.
Preferably, as shown in figure 8, demodulator circuit 7 includes acquisition processing module 701 and D/A modular converters 702.At collection
The data signal that reason module 701 can transmit decision circuit 6 is acquired, and is then sent to D/A modular converters 702, and D/A turns
It is then analog electrical signal by the digital signal transition of collection to change the mold block 702, and the analog electrical signal finally is passed through into acquisition process mould
Block 701 is transferred to output circuit 8.What deserves to be explained is, acquisition processing module 701 and D/A modular converters 702 can be using having
Data acquisition and the microprocessor chip of translation function, the crystal oscillator frequency of its microprocessor chip are not less than 16MHZ, it is possible to achieve
Data acquisition process and D/A conversions.
It is preferred that demodulator circuit 7 can also include display screen 703.The display screen 703 is connected with acquisition processing module 701,
The operating result of acquisition processing module 701 and D/A modular converters 702 can be shown.Furthermore it is possible to pass through display screen
The signal transacting of 703 pairs of acquisition processing modules 701 and D/A modular converters 702 is controlled, assigns instruction.
As one embodiment, demodulator circuit 7 further comprises the system clock module being connected with acquisition processing module 701
704.Described system clock module 704 can be controlled to the time of acquisition processing module 701 and D/A modular converters 702,
For example：Timesharing control, timing, timestamp etc..In addition, acquisition processing module 701 and D/A modular converters 702 can be when will be various
Between handle in system clock module 704 show.
As embodiment, the analog electrical signal after output circuit 8 can reduce demodulator circuit 7 is output to extraneous terminal.
Wherein, the analog electrical signal after reduction can be word, music, video etc..It is preferred that output circuit 8 uses data transfer
Line is connected on pinboard and constituted.
In summary, the reception device for the visible light communication system based on white light LEDs that the present invention is provided, is creatively carried
A kind of reception device being related to using the preposition amplification of pre-and-post equalization mutual impedance is gone out, balancing technique and post-equalization before effectively overcoming
The deficiency of technology, high sensitivity small with noise, high bandwidth, the advantage of high-gain；Moreover, balanced transimpedance before both having overcome
The problem of amplifying circuit noise jamming is big, and effectively solve post-equalization transimpedance amplifying circuit bandwidth, gain and sensitivity
Not high enough the problem of；At the same time, reception device has very wide bandwidth and very high sensitivity, and circuit is workable, structure
Simply, cost is low；It is preposition by pre-and-post equalization transimpedance in the case where not increasing the difficulty of circuit design and preparation technology
The reception device of amplification, realizes the visible light communication system based on white light LEDs, there is great actual application value；Finally, entirely
The reception device of the described visible light communication system based on white light LEDs is easy, compact, it is easy to accomplish.
Those of ordinary skills in the art should understand that：The specific embodiment of the present invention is the foregoing is only, and
The limitation present invention is not used in, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc.,
It should be included within protection scope of the present invention.
Claims (9)
1. a kind of reception device of the visible light communication system based on white light LEDs, it is characterised in that including the detection of at least one set of light
Circuit, pre-equalizing circuit, pre-amplification circuit, post-equalization filter circuit, main amplifying circuit, demodulator circuit and output circuit；Its
In, the optical detection circuit receives the optical signal that the visible light communication system emitter based on white light LEDs is sent, then described
The optical signal can be converted into low current signal by optical detection circuit；Then weak current is believed by the pre-equalizing circuit
Number isostatic compensation is carried out, then be amplified and filter through the pre-amplification circuit and the post-equalization filter circuit, most pass through afterwards
The demodulator circuit is reduced into original analog electric signal, is exported by the output circuit；
Wherein, the post-equalization filter circuit is using three electric capacity C1C2C3With two inductance L1L2Constitute the second order filter of a π type
Ripple equalizing circuit, the other interference noises that the noise produced through pre-equalizing circuit will be filtered out with fail to filter, and post-equalization
Filter circuit carries out the bandwidth of secondary expansion signal simultaneously, as follows：
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Wherein, L=L1//L2, C=C1//C2//C3。
2. reception device according to claim 1, it is characterised in that the visible light communication system based on white light LEDs
Reception device also include decision circuit, the decision circuit one end is connected with the main amplifying circuit, the other end and the demodulation
Circuit is connected；Also, the decision circuit can adjudicate whether the signal exported through the main amplifying circuit is the data transmitted
Signal and shaping.
3. reception device according to claim 2, it is characterised in that the decision circuit uses voltage comparator realization side
Formula, the input anode series resistance R of voltage comparator10And with the main amplifying circuit transmit signal be connected, voltage ratio compared with
The input cathode series resistance R of device15Then voltage is connect, one is bridged between the input cathode and output end of voltage comparator
R16, negative voltage feedback is formed, between the power supply and output end of voltage comparator and a R is met14, it is used as protective resistance.
4. reception device according to claim 1, it is characterised in that described optical detection circuit is from sensitive wave length
400nm-1100nm photodiode, the ac equivalent circuit of described optical detection circuit is a current source Is and a knot
Resistance R1 and a junction capacity C1 parallel connection constitute a photodiode.
5. reception device according to claim 4, it is characterised in that the pre-equalizing circuit is posted using optical detection circuit
Raw electric capacity CdWith the input capacitance C of pre-amplification circuitiWith input resistance RiIsostatic compensation circuit before constituting, pre-equalizing circuit
Compensating frequency is：
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6. reception device according to claim 5, it is characterised in that the Pre-amplifier Circuit Design is that transimpedance is preposition
Amplifying circuit, the voltage pulse signal with certain amplitude is converted into by the low current signal after pre-equalizing circuit.
7. reception device according to claim 6, it is characterised in that the pre-amplification circuit is put including first computing
Big device constitutes preposition mutual impedance negative voltage feedback amplifying circuit, the faint photogenerated current produced through optical detection circuit with R1 and R3
Signal obtains amplifying for the first time herein, R6, R7, R8, and R9 is the build-out resistor of circuit；L1, L2, C3, C4, C5 constitute a Π
The second-order filter network of type, other noise clutters are filtered out；Second operational amplifier and R4, R5 constitute the master of negative voltage feedback
Amplifying circuit, herein photogenerated current signal obtain secondary amplification, reach circuit required voltage amplitude below；C1, C2,
C6, C7 filter out the AC signal of constant voltage dc source；C8, C9 and R2 constitute RC filter networks, what is produced through optical detection circuit
Clutter and noise filtering that other are mixed into by faint photogenerated current signal before not being exaggerated.
8. reception device according to claim 1, it is characterised in that the main amplifying circuit is using multi-cascade negative-feedback
Mode, the voltage pulse signal that the pre-amplification circuit is exported is amplified to the level rank required for back end signal processing.
9. the reception device according to Claims 2 or 3, it is characterised in that the demodulator circuit includes acquisition processing module
With D/A modular converters, the data signal that the decision circuit is transmitted is acquired, is then sent to by the acquisition processing module
The digital signal transition of collection is then analog electrical signal by the D/A modular converters, the D/A modular converters, finally by the mould
Intend electric signal and the output circuit is transferred to by the acquisition processing module；
The demodulator circuit also includes display screen, and the display screen is connected with acquisition processing module, by the acquisition processing module with
The operating result of the D/A modular converters is shown；In addition it is possible to by the display screen to the acquisition processing module
It is controlled with the signal transacting of the D/A modular converters, assigns instruction；
The demodulator circuit further comprises the system clock module being connected with the acquisition processing module, described system clock mould
Block is controlled to the time of the acquisition processing module and the D/A modular converters；In addition, the acquisition processing module and institute
D/A modular converters are stated to show various time-triggered protocols in the system clock module.
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| CN201510515892.3A CN105227245B (en) | 2015-08-20 | 2015-08-20 | A kind of reception device of the visible light communication system based on white light LEDs |
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| CN105610502A (en) * | 2016-02-29 | 2016-05-25 | 天津大学 | Special visible light communication based integrated circuit for receiver |
| CN107171737B (en) * | 2016-03-08 | 2020-03-06 | 深圳光启智能光子技术有限公司 | Optical chip for optical communication and authentication device |
| CN107171734B (en) * | 2016-03-08 | 2020-03-06 | 深圳光启智能光子技术有限公司 | Optical chip for optical communication |
| KR102057726B1 (en) | 2016-03-08 | 2019-12-19 | 쿠앙치 인텔리전트 포토닉 테크놀로지 리미티드 | Lighting Noise Reduction Circuit, Receiver, and Lighting Chip |
| CN109923551A (en) * | 2017-08-14 | 2019-06-21 | 深圳市汇顶科技股份有限公司 | The method of terminal device, optical finger print identification mould group and operating terminal equipment |
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| WO2023115456A1 (en) * | 2021-12-23 | 2023-06-29 | 深圳市傲科光电子有限公司 | Continuous time linear equalization circuit and broadband receiver |
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