CN105306025A - Voltage comparison circuit for visible light communication - Google Patents
Voltage comparison circuit for visible light communication Download PDFInfo
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- CN105306025A CN105306025A CN201510639305.1A CN201510639305A CN105306025A CN 105306025 A CN105306025 A CN 105306025A CN 201510639305 A CN201510639305 A CN 201510639305A CN 105306025 A CN105306025 A CN 105306025A
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Abstract
The invention relates to a voltage comparison circuit for visible light communication. The voltage comparison circuit comprises a photoelectric diode, a first amplifier and a comparator, wherein a positive phase input end of the first amplifier is connected with a constant voltage, a negative input end of the first amplifier is connected with the photoelectric diode, and an output end of the first amplifier is connected to a comparison circuit of the comparator; a first resistor is connected between the output end of the first amplifier and the positive phase input end of the comparator, a RC circuit is connected between the output end of the first amplifier and the negative input end of the comparator, and the output end of the comparator outputs an original transmission signal. A reference voltage Vref in the circuit provided by the invention is extracted from a signal Vin processed by a voltage amplifier, when Vin offsets, Vref correspondingly offsets, the signal output by the comparator generates no error, and thus invariable output is kept; and the output of the comparator is consistent with the height of the original transmission signal, so that the error rate is low.
Description
Technical field
The invention belongs to technical field of photo communication, be specifically related to a kind of for the voltage comparator circuit in visible light communication.
Background technology
By the communication mode that the LED of green energy conservation is transmission base station, people are called visible light communication (visiblelightcommunication, VLC).Compare with conventional art, the available bandwidth of visible light communication, fail safe and privacy are high, without electromagnetic interference, also do not need frequency range permission, just can realize high bandwidth with low cost and two-forty carry out without communication access; Also there is good spatial reuse simultaneously, expand network coverage face in large area, also be that radio frequency technology is well supplemented, can meet the requirement of Novel multimedia of future generation communication completely, this historical background facilitates the producing and developing of visible light communication technology just.
On the Optical Receivers of visible light communication system, photodiode is transformed into current signal after detecting light signal, through across resistance amplifying circuit after become voltage signal, and then by voltage signal amplify, then through comparator relatively after revert to original transmitting.Traditional comparison circuit as shown in fig. 1, reference voltage gets a fixing voltage, along with the device operating time increases and the change of environment for use, cause the signal after voltage amplifier can produce skew shake, and now, reference voltage is still a fixed value, and the signal that comparator exports then can make a mistake.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of for the voltage comparator circuit in visible light communication, reference voltage V ref in this circuit takes from the signal Vin after voltage amplifier, when Vin offsets, Vref also can correspondingly offset, the signal that comparator exports can not make a mistake, and keeps output constant; Comparator is exported to transmit highly consistent with original, and the error rate is low.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of for the voltage comparator circuit in visible light communication, it comprises photodiode, the first amplifier and comparator, the normal phase input end of described first amplifier connects constant voltage, the negative-phase input of described first amplifier connects photodiode, and the output of described first amplifier is connected on the comparison circuit of described comparator; The first resistance is connected with between the output of described first amplifier and the normal phase input end of comparator, connect a RC circuit between the output of described first amplifier and the negative-phase input of comparator, the output of described comparator exports original transmitting.
In a preferred embodiment of the present invention, comprise further, the second amplifier is also connected with between described first amplifier and comparator, the normal phase input end of described second amplifier is connected to the output of described first amplifier, the negative-phase input of described second amplifier connects constant voltage by the second resistance, and the output of described second amplifier connects the input of described comparator.
In a preferred embodiment of the present invention, comprise further, between described first amplifier and the second amplifier, be provided with high pass filter.
In a preferred embodiment of the present invention, comprise further, between the output of described first amplifier and negative-phase input, be connected with the 3rd resistance, described 3rd resistor coupled in parallel first electric capacity.
In a preferred embodiment of the present invention, comprise further, between the output of described second amplifier and negative-phase input, be connected with the 4th resistance, described 4th resistor coupled in parallel second electric capacity.
In a preferred embodiment of the present invention, comprise further, described first amplifier is trans-impedance amplifier, and described second amplifier is voltage amplifier.
The invention has the beneficial effects as follows:
One, reference voltage V ref in circuit of the present invention take from the signal Vin after voltage amplifier, and when Vin offsets, Vref also can correspondingly offset, and the signal that comparator exports can not make a mistake, and keep exporting constant; Comparator is exported to transmit highly consistent with original, and the error rate is low.
Two, circuit diagram principle of the present invention is that photodiode detects light signal and is transformed into current signal, voltage signal is become through trans-impedance amplifier, through voltage amplifier, voltage signal is amplified again, compare through comparator again, revert to original transmitting, this circuit structure is simple, can carry out signal transmission with the extremely low error rate.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in embodiment of the present invention technology, be briefly described to the accompanying drawing used required in the description of embodiment technology below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of comparator part in prior art.
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, 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 the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment
As shown in Figure 2, disclose a kind of for the voltage comparator circuit in visible light communication in the present embodiment, this circuit application is to the receiving unit in visible light communication, and it comprises photodiode, the first amplifier, the second amplifier and comparator.
Concrete, the normal phase input end of above-mentioned first amplifier connects constant voltage, and the negative-phase input of above-mentioned first amplifier connects photodiode, and the output of above-mentioned first amplifier is connected on the comparison circuit of above-mentioned comparator; The second amplifier is also connected with between above-mentioned first amplifier and comparator, the normal phase input end of above-mentioned second amplifier is connected to the output of above-mentioned first amplifier, the negative-phase input of above-mentioned second amplifier connects constant voltage by the second resistance, and the output of above-mentioned second amplifier connects the input of above-mentioned comparator; The first resistance is connected with between the output of above-mentioned first amplifier and the normal phase input end of comparator, connect a RC circuit between the output of above-mentioned first amplifier and the negative-phase input of comparator, the output of above-mentioned comparator exports original transmitting.
Be connected with the 3rd resistance between the output of above-mentioned first amplifier and negative-phase input, above-mentioned 3rd resistor coupled in parallel first electric capacity, is connected with the 4th resistance between the output of above-mentioned second amplifier and negative-phase input, above-mentioned 4th resistor coupled in parallel second electric capacity.Above-mentioned 3rd resistance and the 4th resistance are feedback resistance in the present embodiment, and its function is relevant with the multiplication factor of the first amplifier and the second amplifier.
And, in the present embodiment, in order to better signal transmission, between above-mentioned first amplifier and the second amplifier, be provided with high pass filter, high pass filter comprises and is connected to the first amplifier out and the second amplifier the 3rd electric capacity, with the 5th resistance being connected bias voltage.
In the present embodiment, the principle of whole circuit is: photodiode detects light signal and is transformed into current signal, becomes voltage signal through the first amplifier, is amplified by voltage signal through the second amplifier, again through the comparison of comparator, revert to original transmitting.Wherein, above-mentioned first amplifier is trans-impedance amplifier, and above-mentioned second amplifier is voltage amplifier.
In the circuit of comparator part, signal after voltage amplifier amplifies, one tunnel connects the normal phase input end of the first resistance to comparator, and a road is connected to the negative-phase input of comparator through RC circuit, and in fact above-mentioned RC circuit comprises the 6th resistance and the 4th electric capacity.In the application of reality, according to different service conditions, parameter can adjust, and takes suitable parameter, and reference voltage accurately can remain on the mean value of input signal, and now, the output of comparator can transmit highly consistent with original, and the error rate is very low.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses 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 restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. one kind for the voltage comparator circuit in visible light communication, it comprises photodiode, the first amplifier and comparator, the normal phase input end of described first amplifier connects constant voltage, the negative-phase input of described first amplifier connects photodiode, and the output of described first amplifier is connected on the comparison circuit of described comparator; It is characterized in that, the first resistance is connected with between the output of described first amplifier and the normal phase input end of comparator, connect a RC circuit between the output of described first amplifier and the negative-phase input of comparator, the output of described comparator exports original transmitting.
2. according to claim 1 for the voltage comparator circuit in visible light communication, it is characterized in that, the second amplifier is also connected with between described first amplifier and comparator, the normal phase input end of described second amplifier is connected to the output of described first amplifier, the negative-phase input of described second amplifier connects constant voltage by the second resistance, and the output of described second amplifier connects the input of described comparator.
3. according to claim 2ly to it is characterized in that for the voltage comparator circuit in visible light communication, between described first amplifier and the second amplifier, be provided with high pass filter.
4. according to claim 1ly to it is characterized in that for the voltage comparator circuit in visible light communication, be connected with the 3rd resistance between the output of described first amplifier and negative-phase input, described 3rd resistor coupled in parallel first electric capacity.
5. according to claim 2ly to it is characterized in that for the voltage comparator circuit in visible light communication, be connected with the 4th resistance between the output of described second amplifier and negative-phase input, described 4th resistor coupled in parallel second electric capacity.
6. according to claim 1ly it is characterized in that for the voltage comparator circuit in visible light communication, described first amplifier is trans-impedance amplifier, and described second amplifier is voltage amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510639305.1A CN105306025A (en) | 2015-09-30 | 2015-09-30 | Voltage comparison circuit for visible light communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510639305.1A CN105306025A (en) | 2015-09-30 | 2015-09-30 | Voltage comparison circuit for visible light communication |
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| CN105306025A true CN105306025A (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510639305.1A Pending CN105306025A (en) | 2015-09-30 | 2015-09-30 | Voltage comparison circuit for visible light communication |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113794613A (en) * | 2021-09-13 | 2021-12-14 | 中车大连机车研究所有限公司 | Direct-current carrier communication module of locomotive fire-fighting controller |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4812773A (en) * | 1986-12-27 | 1989-03-14 | Sony Corporation | Filter adjustment apparatus and method |
| JP2006081141A (en) * | 2004-08-09 | 2006-03-23 | Sumitomo Electric Ind Ltd | Optical receiver |
| CN203554409U (en) * | 2013-10-28 | 2014-04-16 | 杭州利亿达科技有限公司 | 4-20mA simulating output circuit outputting multipath electrical parameter signals in mixed manner |
| CN203554545U (en) * | 2013-10-28 | 2014-04-16 | 苏州昭创光电技术有限公司 | Handset internet-surfing device based on visible-light communication |
-
2015
- 2015-09-30 CN CN201510639305.1A patent/CN105306025A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4812773A (en) * | 1986-12-27 | 1989-03-14 | Sony Corporation | Filter adjustment apparatus and method |
| JP2006081141A (en) * | 2004-08-09 | 2006-03-23 | Sumitomo Electric Ind Ltd | Optical receiver |
| CN203554409U (en) * | 2013-10-28 | 2014-04-16 | 杭州利亿达科技有限公司 | 4-20mA simulating output circuit outputting multipath electrical parameter signals in mixed manner |
| CN203554545U (en) * | 2013-10-28 | 2014-04-16 | 苏州昭创光电技术有限公司 | Handset internet-surfing device based on visible-light communication |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113794613A (en) * | 2021-09-13 | 2021-12-14 | 中车大连机车研究所有限公司 | Direct-current carrier communication module of locomotive fire-fighting controller |
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