CN206865464U - A kind of rural power grids engineering multimode fibre receiving circuit - Google Patents
A kind of rural power grids engineering multimode fibre receiving circuit Download PDFInfo
- Publication number
- CN206865464U CN206865464U CN201720622598.7U CN201720622598U CN206865464U CN 206865464 U CN206865464 U CN 206865464U CN 201720622598 U CN201720622598 U CN 201720622598U CN 206865464 U CN206865464 U CN 206865464U
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- multimode fibre
- resistance
- electric capacity
- speed
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- 239000000835 fiber Substances 0.000 title claims abstract description 39
- 238000001914 filtration Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 239000013307 optical fiber Substances 0.000 abstract description 6
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of rural power grids engineering multimode fibre receiving circuit, formed and be sequentially connected by multimode fibre receiver, high speed operation amplifier, high-speed comparator, the output end of multimode fibre receiver is connected to the in-phase input end of high speed operation amplifier by first order capacitance and resistor voltage divider circuit, the positive polarity input of high-speed comparator is connected to by the resistor voltage divider circuit of second level capacitance and connection power supply, the output of high-speed comparator terminates to the logic circuit of rear class；Another input of high-speed comparator uses the intermediate level of working power.When transmission rate is 20Mbit/s, optical fiber receiving sensitivity can reach 30dB, if speed is reduced to 10Mbit/s, optical fiber receiving sensitivity can be improved to 33dB.Breach the bottleneck that conventional transmission rate and optical fiber receiving sensitivity can not get both, can meet in digital transformer substation various applications to multimode fibre the needs of communicating.
Description
Technical field
It the utility model is related to a kind of rural power grids engineering multimode fibre receiving circuit, the electricity suitable for upgrading of rural power grids engineering
Force system digital transformer substation, Intelligent transformer station.
Background technology
Because optical fiber transmission has, high reliability, transmission speed are fast, wiring is convenient, low cost and other advantages, in the upgrading of rural power grids
When being related to Intelligent transformer station project in engineering, optical cable substitutes most of cable to turn into inevitable, and increasing data exchange makes
With the multimode fibre communication technology.
Traditional multimode fibre communication typically uses following two schemes：A kind of connect using the multimode fibre of TTL outputs
Receive device directly to export, though receiving sensitivity can reach -20dB or so, shortcoming is transmission rate no more than 6Mbit/s；In addition
A kind of is to add high-speed comparator using the multimode fibre receiver of simulation output, and transmission rate receives sensitive in 10Mbit/s
Degree is no more than -26dB, and as transmission rate brings up to 20Mbit/s, receiving sensitivity can drop to -23dB, and shortcoming is transmission rate
It can not be got both with receiving sensitivity.The shortcomings that both schemes, all strongly limit the popularization and use of multimode fibre technology.
Multimode fibre receiver of most of the prior art using TTL outputs and the multimode fibre using simulation output receive
Device adds the application circuit schematic diagram of high-speed comparator, above mentioned problem be present in the circuit.
Utility model content
The purpose of this utility model is：A kind of highly sensitive multimode fibre receiving circuit with practicality is provided, can
It is widely used in needing in upgrading of rural power grids engineering in the equipment that multimode fibre communicates.
The utility model provides following solutions：
A kind of rural power grids engineering multimode fibre receiving circuit, the circuit specifically include the multimode fibre being sequentially connected with and received
Device U1, high speed operation amplifier U3 and high-speed comparator U2, in addition to the first C1 is to the 4th C4 electric capacity, the first R1 to the 8th R8
Resistance, multimode fibre receiver U1 output end connect after the second electric capacity C2, the 5th resistance R5, the 6th resistance R6 successively
To high speed operation amplifier U3 in-phase input end, high speed operation amplifier U3 inverting input passes sequentially through the 3rd electric capacity
C3, the 7th resistance R7, the 8th resistance R8 are connected with high speed operation amplifier U3 output end, and high speed operation amplifier U3's is defeated
Go out the positive polarity input that end is connected to high-speed comparator U2 after the first electric capacity C1, first resistor R1, second resistance R2 successively
End, high-speed comparator U2 working power be connected to after the 4th electric capacity C4,3rd resistor R3, the 4th resistance R4 high ratio compared with
Device U2 negative polarity input, the logic circuit of high-speed comparator U2 output end access rear class.
As further preferred scheme of the present utility model, in the circuit, capacitance and resistor voltage divider circuit are used
The DC component of the analog output signal of multimode fibre receiver is filtered, the high speed operation amplifier superposition direct current point
Amount so that useful signal is exaggerated, and DC component and noise are filtered out.
As further preferred scheme of the present utility model, the threeth electric capacity C3 in parallel with the 8th resistance R8 is more for filtering out
The high-frequency noise of more than 100M in mode fiber receiver U1 analog output signal；
The fourth electric capacity C4 in parallel with the 4th resistance R4 is used for filtering out high-frequency noise in working power, improve high ratio compared with
Device U2 working characteristics.
As further preferred scheme of the present utility model, the concrete model of the high speed operation amplifier U3 is
AD8061。
As further preferred scheme of the present utility model, the concrete model of the high-speed comparator U2 is TLV3501A.
The beneficial effects of the utility model：The utility model provides a kind of highly sensitive multimode light with practicality
Fine receiving circuit and its application, when transmission rate is 20Mbit/s, optical fiber receiving sensitivity can reach -30dB, breach with
The bottleneck that can not be got both toward transmission rate and optical fiber receiving sensitivity, can meet that various applications are to multimode in digital transformer substation
The demand of fiber optic communication.
Brief description of the drawings
Fig. 1 uses circuit theory diagrams to be of the present utility model.
Embodiment
The technical solution of the utility model is specifically described below in conjunction with the accompanying drawings.
Circuit theory diagrams of the present utility model in traditional multimode fibre using simulation output as shown in figure 1, receive
On the basis of device adds high-speed comparator application circuit, highly sensitive multimode fibre of the present utility model receives application circuit increase
One high speed operation amplifier U3 and some resistance capacitances improve the receiving sensitivity of multimode fibre receiving circuit.
A kind of suitable multimode fibre high-speed communication as shown in Figure 1, the highly sensitive multimode fibre of long-distance transmissions connect
Application circuit is received, multimode fibre receiver U1 output end is connected to high-speed computation after electric capacity C2, resistance R5, resistance R6 and put
Big device U3 in-phase input end, high speed operation amplifier U3 inverting input pass through electric capacity C3, resistance R7, resistance R8 and height
Fast operational amplifier U3 output end is connected, and high speed operation amplifier U3 output end is by electric capacity C1, resistance R1, resistance R2
High-speed comparator U2 positive polarity input is connected to afterwards, and high-speed comparator U2 working power is by electric capacity C4, resistance R3, electricity
High-speed comparator U2 negative polarity input is connected to after resistance R4, high-speed comparator U2 output end is the numeral letter of high quality
Number output, can access rear class logic circuit.
Specific implementation process is to amplify multimode fibre receiver U1 analog output signal by high speed operation amplifier U3,
And high ratio is carried out to the signal of input compared with so as to the minimum high-speed figure letter of output phase error by high-speed comparator U2
Number.
The electric capacity C3 in parallel with resistance R8 can be used to filter out the 100M in multimode fibre receiver U1 analog output signal
High-frequency noise above, improve the signal to noise ratio of analog signal.The electric capacity C4 in parallel with resistance R4 can be used to filter out working power
On high-frequency noise, improve high-speed comparator U2 working characteristics.
In a preferred embodiment, high speed operation amplifier U3 model is AD8061, and high-speed comparator U2 model is
TLV3501A。
Claims (5)
- A kind of 1. rural power grids engineering multimode fibre receiving circuit, it is characterised in that：The circuit specifically include be sequentially connected with it is more Mode fiber receiver（U1）, high speed operation amplifier（U3）And high-speed comparator（U2）, in addition to first（C1）To the 4th（C4） Electric capacity, first（R1）To the 8th（R8）Resistance, multimode fibre receiver（U1）Output end pass through the second electric capacity successively（C2）, Five resistance（R5）, the 6th resistance（R6）After be connected to high speed operation amplifier（U3）In-phase input end, high speed operation amplifier （U3）Inverting input pass sequentially through the 3rd electric capacity（C3）, the 7th resistance（R7）, the 8th resistance（R8）Amplify with high-speed computation Device（U3）Output end be connected, high speed operation amplifier（U3）Output end pass through the first electric capacity successively（C1）, first resistor （R1）, second resistance（R2）After be connected to high-speed comparator（U2）Positive polarity input, high-speed comparator（U2）Work electricity The 4th electric capacity is passed through in source（C4）, 3rd resistor（R3）, the 4th resistance（R4）After be connected to high-speed comparator（U2）Negative polarity it is defeated Enter end, high-speed comparator（U2）Output end access rear class logic circuit.
- A kind of 2. rural power grids engineering multimode fibre receiving circuit as claimed in claim 1, it is characterised in that：In the circuit, The DC component of the analog output signal of multimode fibre receiver is filtered using capacitance and resistor voltage divider circuit, institute State high speed operation amplifier superposition DC component so that useful signal is exaggerated, and DC component and noise are filtered out.
- A kind of 3. rural power grids engineering multimode fibre receiving circuit as claimed in claim 1, it is characterised in that：With the 8th resistance （R8）3rd electric capacity in parallel（C3）For filtering out multimode fibre receiver（U1）Analog output signal in more than 100M High-frequency noise；With the 4th resistance（R4）4th electric capacity in parallel（C4）For filtering out the high-frequency noise in working power, improve high ratio compared with Device（U2）Working characteristics.
- A kind of 4. rural power grids engineering multimode fibre receiving circuit as claimed in claim 1, it is characterised in that：The high-speed computation Amplifier（U3）Concrete model be AD8061.
- A kind of 5. rural power grids engineering multimode fibre receiving circuit as claimed in claim 1, it is characterised in that：The high ratio compared with Device（U2）Concrete model be TLV3501A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720622598.7U CN206865464U (en) | 2017-05-31 | 2017-05-31 | A kind of rural power grids engineering multimode fibre receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720622598.7U CN206865464U (en) | 2017-05-31 | 2017-05-31 | A kind of rural power grids engineering multimode fibre receiving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206865464U true CN206865464U (en) | 2018-01-09 |
Family
ID=60825798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720622598.7U Expired - Fee Related CN206865464U (en) | 2017-05-31 | 2017-05-31 | A kind of rural power grids engineering multimode fibre receiving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206865464U (en) |
-
2017
- 2017-05-31 CN CN201720622598.7U patent/CN206865464U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180109 Termination date: 20180531 |