CN206060780U - Device for detecting code error - Google Patents
Device for detecting code error Download PDFInfo
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- CN206060780U CN206060780U CN201620958665.8U CN201620958665U CN206060780U CN 206060780 U CN206060780 U CN 206060780U CN 201620958665 U CN201620958665 U CN 201620958665U CN 206060780 U CN206060780 U CN 206060780U
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Abstract
This utility model discloses a kind of device for detecting code error, including code error tester, optical module, signal level change-over panel, signal level change-over panel includes the first signal level shift circuit and secondary signal level shifting circuit, the input of the first signal level shift circuit is TTL/LVTTL level, it is output as CML/PECL level, the input of secondary signal level shifting circuit is CML/PECL level, it is output as TTL/LVTTL level, code error tester connects the output of the first signal level shift circuit and the input of secondary signal level shifting circuit, optical module connects the input of the first signal level shift circuit and the output of secondary signal level shifting circuit.This utility model supports that the output and input level of tested optical module is converted to TTL/LVTTL level, matches with code error tester using the normal performance for not affecting code error tester.
Description
Technical field
This utility model is related to optical communication field, more particularly to a kind of device for detecting code error.
Background technology
Code error tester is the requisite equipment of optical module communication test, with the continuous development of optical module, various each
The code error tester of sample occurs commercially.Existing Error Detector is all CML level or PECL from several million or even 10G Error Detector
Level, it is not directed to the code error tester of TTL/LVTTL level.
Utility model content
This utility model aims to provide a kind of device for detecting code error, supports that the output and input level of tested optical module is converted to
TTL/LVTTL level, is matched with code error tester using the normal performance for not affecting code error tester.
To reach above-mentioned purpose, this utility model employs the following technical solutions realization：
Device for detecting code error disclosed in this utility model, including code error tester, optical module, signal level change-over panel, institute
Stating signal level change-over panel includes the first signal level shift circuit and secondary signal level shifting circuit, the first signal electricity
The input of flat change-over circuit is TTL/LVTTL level, is output as CML/PECL level, the secondary signal level shifting circuit
It is input into as CML/PECL level, is output as TTL/LVTTL level, the code error tester connects the first signal level shift circuit
Output and secondary signal level shifting circuit input, the optical module connect the input of the first signal level shift circuit and
The output of secondary signal level shifting circuit.
Preferably, first signal level shift circuit includes integrated circuit MAX3747, the integrated circuit
One end of the 1 foot connection resistance R13 of MAX3747, one end of resistance R14, the other end connection integrated circuit of resistance R13
7 feet of MAX3747, one end of resistance R26, the other end ground connection of resistance R26；The 2 feet connection R21's of integrated circuit MAX3747
One end, one end of electric capacity C17, one end of the other end connection inductance L2 of electric capacity C17, one end of electric capacity C18, inductance L2's is another
End ground connection, one end of the 3 feet connection resistance R20 of integrated circuit MAX3747, one end of electric capacity C19, the other end of electric capacity C19 connect
One end, the other end of electric capacity C18 of inductance L3 are connect, the other end of inductance L3 connects one end of resistance R18, one end of resistance R19,
The outfan of the TTL/LVTTL level signals of the other end connection optical module of resistance R18, the other end ground connection of resistance R19；It is integrated
4 feet connection one end of resistance R23 of circuit MAX3747, the other end of resistance R20, the other end of resistance R21, the one of electric capacity C22
End, one end of electric capacity C23, the other end of electric capacity C22, the other end ground connection of electric capacity C23, the other end connection resistance of resistance R23
One end of R27,5 feet of integrated circuit MAX3747, the other end connection positive source of resistance R27, shunt capacitance on resistance R23
C21；The 6 feet ground connection of integrated circuit MAX3747；The negative electrode of the 7 foot connecting luminous diode LED3 of integrated circuit MAX3747, sends out
The anode of optical diode LED3 connects one end of resistance R28, the other end connection positive source of resistance R28；Integrated circuit
One end of the 8 feet connection resistance R17 of MAX3747, one end of resistance R22, one end of electric capacity C20, another termination of resistance R22
Ground, the inverting input of the other end connection code error tester of electric capacity C20, one end of resistance R24, one end of resistance R25, resistance
Another termination positive source of R24, the other end ground connection of resistance R25；The 9 feet connection resistance R17's of integrated circuit MAX3747 is another
One end, one end of resistance R12, one end of electric capacity C16, the other end ground connection of resistance R12, the other end connection error code of electric capacity C16
The in-phase input end of tester, one end of resistance R10, one end of resistance R11, another termination positive source of resistance R11, resistance
The other end ground connection of R10；The 10 feet connection positive source of integrated circuit MAX3747.
Further, the integrated circuit MAX3747 is provided with decoupling capacitor C15.
Further, connect between the other end and ground of the inductance L2 0 ohmage R15, and the inductance L3's is another
End and the 0 ohmage R19 that connects between ground.
Preferably, the secondary signal level shifting circuit includes integrated circuit UX2103, the integrated circuit UX2103
1,2 feet between shunt capacitance C7；The 3 feet ground connection of integrated circuit UX2103；The 4 feet connection resistance R5's of integrated circuit UX2103
One end, one end of electric capacity C10, the in-phase output end of the other end connection code error tester of electric capacity C10, one end of electric capacity C11；Collection
One end of the other end, electric capacity C12 into the 5 feet connection resistance R5 of circuit U X2103, the other end connection error code testing of electric capacity C12
The reversed-phase output of instrument, the other end of electric capacity C11；The 6 feet connection positive source of integrated circuit UX2103, one end of electric capacity C14；
7 feet of integrated circuit UX2103 connect the other end of electric capacity C14；One end of the 8 feet connection resistance R8 of integrated circuit UX2103, electricity
One end of resistance R9, the other end ground connection of resistance R8；The 9 feet connection other end of resistance R9 of integrated circuit UX2103, resistance R7
One end, the negative electrode of LED 2, the anode of LED 2 connect one end of resistance R6, and resistance R6's is another
End, the other end of resistance R7 are all connected with positive source；The 11 feet ground connection of integrated circuit UX2103；13 feet of integrated circuit UX2103
One end of connection resistance R3, the input of the TTL/LVTTL level signals of optical module, the other end connection power supply of resistance R3 is just
Pole；The 14 feet connection positive source of integrated circuit UX2103；16 feet of integrated circuit UX2103 connect one end of resistance R2, resistance
The other end ground connection of R2.
Further, 14 feet of the integrated circuit UX2103 connect one end of electric capacity C9, the other end ground connection of electric capacity C9；
15 feet of integrated circuit UX2103 connect one end of electric capacity C8, the other end ground connection of electric capacity C8.
Further, 6 feet of the integrated circuit UX2103 connect one end of electric capacity C13, another termination of electric capacity C13
Ground.
Further, 13 feet of the integrated circuit UX2103 connect one end, the optical mode of resistance R3 by 0 ohmage R4
The input of the TTL/LVTTL level signals of block.
Operation principle of the present utility model is as follows：CML the or PECL level conversion of input is by signal level change-over panel
TTL/LVTTL signal levels are exported；The TTL/LVTTL signal levels of input are converted to into the output of CML or PECL level；Work as signal
When change-over panel supply voltage is 5V, output level is Transistor-Transistor Logic level；When supply voltage is 3.3V, output level is that LVTTL is electric
It is flat.
The beneficial effects of the utility model are as follows：
1st, signal level change-over panel of the present utility model, supports that conventional code error tester CML and PECL level conversion is
TTL/LVTTL signal levels, meet the error rate test of TTL/LVTTL level optical modules；
2nd, all integrated circuits in this utility model can support the speed of 1.25Gbps, so as to support in speed
50Mbps, the Transistor-Transistor Logic level Error Detector speed than existing maximum 2Mbps improve a lot；
3rd, signal level change-over panel of the present utility model, the matching that can be compatible with all code error testers in existing market make
With；
4th, this utility model cost is very low, practical and convenient, and compatibility is strong.
Description of the drawings
Fig. 1 is theory diagram of the present utility model；
Fig. 2 is the schematic diagram of the first signal level shift circuit；
Schematic diagrams of the Fig. 3 for secondary signal level shifting circuit.
Fig. 4 is the output waveform figure of the LVTTL level of test signal level change-over panel under 5Mbps speed；
Fig. 5 is the output waveform figure of the LVTTL level of test signal level change-over panel under 20Mbps speed；
Fig. 6 is the output waveform figure of the LVTTL level of test signal level change-over panel under 60Mbps speed.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing, to this reality
It is further elaborated with new.
As shown in figure 1, device for detecting code error disclosed in this utility model, including code error tester, optical module, signal level
Change-over panel, signal level change-over panel include the first signal level shift circuit and secondary signal level shifting circuit, the first signal
The input of level shifting circuit is TTL/LVTTL level, is output as CML/PECL level, the secondary signal level shifting circuit
Input be CML/PECL level, be output as TTL/LVTTL level, code error tester connects the first signal level shift circuit
Output and the input of secondary signal level shifting circuit, optical module connect the input of the first signal level shift circuit and the second letter
The output of number level shifting circuit.
As shown in Fig. 2 the first signal level shift circuit includes integrated circuit MAX3747, the 1 of integrated circuit MAX3747
One end of foot connection resistance R13, one end of resistance R14,7 feet of the other end connection integrated circuit MAX3747 of resistance R13, electricity
One end of resistance R26, the other end ground connection of resistance R26；Integrated circuit MAX3747 2 feet connection R21 one end, the one of electric capacity C17
End, one end of the other end connection inductance L2 of electric capacity C17, one end of electric capacity C18, the other end ground connection of inductance L2, integrated circuit
One end of the 3 feet connection resistance R20 of MAX3747, one end of electric capacity C19, one end of the other end connection inductance L3 of electric capacity C19,
The other end of electric capacity C18, one end of the other end connection resistance R18 of inductance L3, one end of resistance R19, the other end of resistance R18
The outfan of the TTL/LVTTL level signals of connection optical module, the other end ground connection of resistance R19；The 4 of integrated circuit MAX3747
Foot connection one end of resistance R23, the other end of resistance R20, the other end of resistance R21, one end of electric capacity C22, the one of electric capacity C23
End, the other end of electric capacity C22, the other end ground connection of electric capacity C23 are one end of the other end connection resistance R27 of resistance R23, integrated
5 feet of circuit MAX3747, the other end connection positive source of resistance R27, shunt capacitance C21 on resistance R23；Integrated circuit
The 6 feet ground connection of MAX3747；The negative electrode of the 7 foot connecting luminous diode LED3 of integrated circuit MAX3747, LED 3
Anode connect resistance R28 one end, resistance R28 the other end connection positive source；The 8 feet connection of integrated circuit MAX3747
One end of resistance R17, one end of resistance R22, one end of electric capacity C20, the other end ground connection of resistance R22, the other end of electric capacity C20
The inverting input of connection code error tester, one end of resistance R24, one end of resistance R25, another termination power of resistance R24
Positive pole, the other end ground connection of resistance R25；Integrated circuit MAX3747 9 feet connection resistance R17 the other end, the one of resistance R12
End, one end of electric capacity C16, the other end ground connection of resistance R12, the other end of electric capacity C16 connect the homophase input of code error tester
End, one end of resistance R10, one end of resistance R11, another termination positive source of resistance R11, the other end ground connection of resistance R10；
The 10 feet connection positive source of integrated circuit MAX3747；The integrated circuit MAX3747 is provided with decoupling capacitor C15；Inductance L2's
Connect between the other end and ground 0 ohmage R15, and connect between the other end and ground of the inductance L3 0 ohmage R19.
As shown in figure 3, secondary signal level shifting circuit includes integrated circuit UX2103,1, the 2 of integrated circuit UX2103
Shunt capacitance C7 between foot；The 3 feet ground connection of integrated circuit UX2103；One end of the 4 feet connection resistance R5 of integrated circuit UX2103,
One end of electric capacity C10, the in-phase output end of the other end connection code error tester of electric capacity C10, one end of electric capacity C11；Integrated electricity
The other end of the 5 feet connection resistance R5 of road UX2103, one end of electric capacity C12, the other end connection code error tester of electric capacity C12
The other end of reversed-phase output, electric capacity C11；The 6 feet connection positive source of integrated circuit UX2103, one end of electric capacity C14；It is integrated
7 feet of circuit U X2103 connect the other end of electric capacity C14；One end of the 8 feet connection resistance R8 of integrated circuit UX2103, resistance R9
One end, resistance R8 the other end ground connection；The 9 feet connection other end of resistance R9 of integrated circuit UX2103, one end of resistance R7,
The negative electrode of LED 2, the anode of LED 2 connect one end of resistance R6, the other end of resistance R6, resistance
The other end of R7 is all connected with positive source；The 11 feet ground connection of integrated circuit UX2103；The 13 feet connection electricity of integrated circuit UX2103
One end of resistance R3, the input of the TTL/LVTTL level signals of optical module, the other end connection positive source of resistance R3；It is integrated
The 14 feet connection positive source of circuit U X2103；16 feet of integrated circuit UX2103 connect one end of resistance R2, and resistance R2's is another
One end is grounded；14 feet of integrated circuit UX2103 connect one end of electric capacity C9, the other end ground connection of electric capacity C9；Integrated circuit
15 feet of UX2103 connect one end of electric capacity C8, the other end ground connection of electric capacity C8；The 6 feet connection electric capacity of integrated circuit UX2103
One end of C13, the other end ground connection of electric capacity C13；13 feet of integrated circuit UX2103 can also be by 0 ohmage R4 connection electricity
One end of resistance R3, the input of the TTL/LVTTL level signals of optical module.
As shown in Fig. 4, Fig. 5, Fig. 6, actual test LVTTL level of the signal level change-over panel under various transfer rates
Output waveform figure, the indices that can be seen that signal from above-mentioned output waveform figure are normal, meet use requirement.
Certainly, this utility model can also have other various embodiments, spiritual and its essence without departing substantially from this utility model
In the case of, those of ordinary skill in the art can make various corresponding changes and deformation, but these phases according to this utility model
The change and deformation answered should all belong to the scope of the claims appended by this utility model.
Claims (8)
1. device for detecting code error, it is characterised in that：Including code error tester, optical module, signal level change-over panel, the signal electricity
Flat change-over panel includes the first signal level shift circuit and secondary signal level shifting circuit, the first signal level conversion electricity
The input on road is TTL/LVTTL level, is output as CML/PECL level, and the input of the secondary signal level shifting circuit is
CML/PECL level, TTL/LVTTL level is output as, the code error tester connects the output of the first signal level shift circuit
With the input of secondary signal level shifting circuit, the optical module connects the input of the first signal level shift circuit and second to be believed
The output of number level shifting circuit.
2. device for detecting code error according to claim 1, it is characterised in that：First signal level shift circuit includes
One end of the 1 foot connection resistance R13 of integrated circuit MAX3747, the integrated circuit MAX3747, one end of resistance R14, resistance
7 feet of the other end connection integrated circuit MAX3747 of R13, one end of resistance R26, the other end ground connection of resistance R26；Integrated electricity
One end of the 2 feet connection R21 of road MAX3747, one end of electric capacity C17, one end of the other end connection inductance L2 of electric capacity C17, electricity
Hold one end of C18, the other end ground connection of inductance L2, one end of the 3 feet connection resistance R20 of integrated circuit MAX3747, electric capacity C19
One end, other end connection one end of inductance L3 of electric capacity C19, the other end of electric capacity C18, the other end connection resistance of inductance L3
One end of R18, one end of resistance R19, the outfan of the TTL/LVTTL level signals of the other end connection optical module of resistance R18,
The other end ground connection of resistance R19；One end of the 4 feet connection resistance R23 of integrated circuit MAX3747, the other end of resistance R20, electricity
The other end of resistance R21, one end of electric capacity C22, one end of electric capacity C23, the other end of electric capacity C22, another termination of electric capacity C23
Ground, one end of the other end connection resistance R27 of resistance R23,5 feet of integrated circuit MAX3747, the other end connection of resistance R27
Positive source, shunt capacitance C21 on resistance R23；The 6 feet ground connection of integrated circuit MAX3747；7 feet of integrated circuit MAX3747 connect
The negative electrode of sending and receiving optical diode LED3, the anode of LED 3 connect one end of resistance R28, the other end of resistance R28
Connection positive source；8 feet connection one end of resistance R17 of integrated circuit MAX3747, one end of resistance R22, the one of electric capacity C20
End, resistance R22 the other end ground connection, electric capacity C20 the other end connection code error tester inverting input, the one of resistance R24
End, one end of resistance R25, another termination positive source of resistance R24, the other end ground connection of resistance R25；Integrated circuit
The other end of the 9 feet connection resistance R17 of MAX3747, one end of resistance R12, one end of electric capacity C16, another termination of resistance R12
Ground, the in-phase input end of the other end connection code error tester of electric capacity C16, one end of resistance R10, one end of resistance R11, resistance
Another termination positive source of R11, the other end ground connection of resistance R10；The 10 feet connection positive source of integrated circuit MAX3747.
3. device for detecting code error according to claim 2, it is characterised in that：The integrated circuit MAX3747 is provided with decoupling
Electric capacity C15.
4. device for detecting code error according to claim 2, it is characterised in that：Go here and there between the other end and ground of the inductance L2
Join 0 ohmage R15, connect between the other end and ground of the inductance L3 0 ohmage R19.
5. the device for detecting code error according to claim 1,2,3 or 4, it is characterised in that：The secondary signal level conversion
Circuit includes integrated circuit UX2103, shunt capacitance C7 between 1,2 feet of the integrated circuit UX2103；Integrated circuit UX2103
3 feet ground connection；One end of the 4 feet connection resistance R5 of integrated circuit UX2103, one end of electric capacity C10, the other end of electric capacity C10 connect
Connect in-phase output end, one end of electric capacity C11 of code error tester；The other end of the 5 feet connection resistance R5 of integrated circuit UX2103,
One end of electric capacity C12, the reversed-phase output of the other end connection code error tester of electric capacity C12, the other end of electric capacity C11；It is integrated
The 6 feet connection positive source of circuit U X2103, one end of electric capacity C14；The 7 feet connection electric capacity C14's of integrated circuit UX2103 is another
One end；One end of the 8 feet connection resistance R8 of integrated circuit UX2103, one end of resistance R9, the other end ground connection of resistance R8；It is integrated
The other end of the 9 feet connection resistance R9 of circuit U X2103, one end of resistance R7, the negative electrode of LED 2, light-emitting diodes
The anode of pipe LED2 connects one end of resistance R6, and the other end of resistance R6, the other end of resistance R7 are all connected with positive source；It is integrated
The 11 feet ground connection of circuit U X2103；One end of the 13 feet connection resistance R3 of integrated circuit UX2103, the TTL/LVTTL of optical module are electric
The input of ordinary mail number, the other end connection positive source of resistance R3；The 14 feet connection positive source of integrated circuit UX2103；Collection
16 feet into circuit U X2103 connect one end of resistance R2, the other end ground connection of resistance R2.
6. device for detecting code error according to claim 5, it is characterised in that：The 14 feet connection of the integrated circuit UX2103
One end of electric capacity C9, the other end ground connection of electric capacity C9；15 feet of integrated circuit UX2103 connect one end of electric capacity C8, electric capacity C8's
The other end is grounded.
7. device for detecting code error according to claim 5, it is characterised in that：The 6 feet connection of the integrated circuit UX2103
One end of electric capacity C13, the other end ground connection of electric capacity C13.
8. device for detecting code error according to claim 5, it is characterised in that：13 feet of the integrated circuit UX2103 pass through
One end of 0 ohmage R4 connection resistance R3, the input of the TTL/LVTTL level signals of optical module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620958665.8U CN206060780U (en) | 2016-08-26 | 2016-08-26 | Device for detecting code error |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620958665.8U CN206060780U (en) | 2016-08-26 | 2016-08-26 | Device for detecting code error |
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| Publication Number | Publication Date |
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| CN206060780U true CN206060780U (en) | 2017-03-29 |
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ID=58382159
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| CN201620958665.8U Active CN206060780U (en) | 2016-08-26 | 2016-08-26 | Device for detecting code error |
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| CN (1) | CN206060780U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107786311A (en) * | 2016-08-26 | 2018-03-09 | 成都芯瑞科技股份有限公司 | Device for detecting code error |
-
2016
- 2016-08-26 CN CN201620958665.8U patent/CN206060780U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107786311A (en) * | 2016-08-26 | 2018-03-09 | 成都芯瑞科技股份有限公司 | Device for detecting code error |
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