CN205336291U - Multisystem intermodulation test platform - Google Patents
Multisystem intermodulation test platform Download PDFInfo
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- CN205336291U CN205336291U CN201521128922.7U CN201521128922U CN205336291U CN 205336291 U CN205336291 U CN 205336291U CN 201521128922 U CN201521128922 U CN 201521128922U CN 205336291 U CN205336291 U CN 205336291U
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- multisystem
- intermodulation
- duplexer
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Abstract
The utility model relates to a multisystem intermodulation test platform, signal source, switch matrix, active part, passive partial, spectral analyser including the order connection, passive part includes a plurality of duplexers, and the test port of every duplexer is used for connecting equipment under test. The utility model discloses an inside circuit structure forms and has adopted the GPIB interface to carry out centralized monitoring, can efficient feedback system running state when realizing signal testing, and the effectual difficult problem that is difficult to the investigation when traditional intermodulation test appearance breaks down of having solved.
Description
Technical field
This utility model belongs to mobile communication product field tests, and specifically a kind of multisystem intermodulation testing platform, solves the intermodulation index test between the system of multisystem mixing product (POI or combiner)。
Background technology
Along with developing rapidly of mobile communication technology, operator obtains increasing communications band and communication technology, from the CDMA800MHz of 2G, GSM900MHz, the 2100MHz of DCS1800MHz to 3G, 4G2300, 2600 frequency ranges, from current operator mode, the various frequency range of various technology will in the middle of the coming years long-term co-existence in the middle of most scene, particularly at some hot zones such as departure hall, railway station, gymnasiuies etc. can not allow to be simultaneously introduced the indoor distributed system of many sets due to the limited space of building construction, therefore it is incorporated in the middle of a set of communication system by the signal of multiple for multiple frequency range communication technology to become inevitable trend, this trend after setting up of listing particular with steel tower telecom technology co., ltd of China is further obvious, and the problem produced therewith to be exactly multisystem carry out close road after to be faced with problems: frequency range is protected, multisystem is disturbed, Intermodulation Interference, the product being used for signal conjunction road at present in mobile communication system is mainly combiner and POI multisystem mixing platform。Especially POI multisystem mixing platform is used primarily in the system of backbone network, the quality of its index is very big on the impact of system, and wherein Intermodulation Interference is the most urgent problem encountered in test process of POI multisystem mixing platform, can pass through to improve the reflection intermodulation suppression for multisystem mixing product (POI) in the middle of daily product design, intermodulation suppression has in-band intermodulation and multisystem intermodulation, existing intermodulation testing platform can also meet the basic test of some multisystem mixing products after the adjustment of technician, but the extremely complex precision building rear system of cutting of platform building tends not to meet systematic error requirement。
Summary of the invention
For the deficiencies in the prior art, the multisystem intermodulation testing platform that this utility model provides a kind of can be realized cross-system, complete reflection intermodulation testing across frequency range。
This utility model is the technical scheme is that multisystem intermodulation testing platform for achieving the above object, including the signal source being linked in sequence, switch matrix, active part, passive part, spectrum analyzer；Described passive part includes multiple duplexer, and the test port of each duplexer is used for connecting equipment under test。
Described active part includes multiple power amplifier, and the input of each power amplifier is connected with the outfan of switch matrix, and the outfan of each amplifier is connected with passive part。
Described passive part includes the 3dB electric bridge, duplexer and the multiplefrequency mixer that are linked in sequence；Two inputs of described 3dB electric bridge are connected with the outfan of two power amplifiers respectively, and the outfan of 3dB electric bridge is connected with the signal input part of duplexer；The coupling aperture of duplexer is connected with the input of multiplefrequency mixer；The outfan of multiplefrequency mixer is connected with spectrum analyzer。
Described 3dB electric bridge and duplexer are multiple。
Described multiplefrequency mixer is multiple。
The gpib interface of described duplexer is connected with computer by signals collecting/processing unit。
Described switch matrix is connected with computer by signals collecting/processing unit。
Described spectrum analyzer is connected with computer。
Described signal source is multiple。
Described signal source is connected with computer。
This utility model has the advantages that and advantage:
1., when test platform need not be changed, cross-system can be completed, across frequency range intermodulation, raising test job efficiency。
2. adopt the design of integration so that the intermodulation testing instrument that the degree of accuracy of system, stability will be more traditional is well a lot。
3. system regular maintenance is convenient and can realize the test of more frequency range intermodulation in this platform technology according to the development of subsequent technology。
4. internal circuit configuration of the present utility model composition have employed gpib interface and carried out Centralized Monitoring, while realizing signal testing can feedback system running status efficiently, effectively solve the difficult problem being difficult to investigate when traditional intermodulation testing instrument breaks down。
5. active part have employed High Linear power amplifier, it is ensured that the long steady operation of system, and passive part have employed low intermodulation device, and all device inside cavitys all have employed silver plating process, it is ensured that long term device steady operation。
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model；
Fig. 2 is structure principle chart of the present utility model。
Detailed description of the invention
Below in conjunction with drawings and Examples, this utility model is described in further detail。
This utility model includes signal source, switch matrix, active part, passive part, signals collecting/processing unit, computer。Wherein active part can launch the multicarrier modulated signal of different frequency range different modulating mode。Signal peak power output 48dBm/ carrier wave。Passive part is made up of several passive modules, can carry out, according to the difference in place, the test that collocation carries out between different system flexibly。This utility model can be supported conventional three rank to reflect intermodulation to seven rank, transmits the test of intermodulation, supports cross-system simultaneously, test across frequency range。Built-in high stability power amplifier, can continuous operation more than 12 hours, output change amount signal less than 0.1dB。The passive module adopted is by the interference of intermodulation product in advanced production technology reduction system, and system is tested oneself intermodulation <-165dBc46dBm；Support that one-touch report automatically generates, it is simple to test data management。
As shown in Fig. 1～2, multisystem cross modulation test system is designed as six major parts: signal source, switch matrix, active part, passive part, signals collecting/processing unit, computer。
Switch matrix adopts the LPC2468 type processor of NXP, is made up of switch matrix unit etc.；Switch matrix unit is connected with computer by gpib interface, and the built-in processor of switch matrix receives the data that computer is sent, and processor parses the signal path needing to switch, control respective switch Continuity signal path after receiving message。The switching of 800MHz signal, 900MHz signal, 1800MHz signal, 2100MHz signal, 2300MHz signal, 2600MHz signal can be completed when not changing RF cable by switch matrix unit, this system have employed many double-pole double throw switches, decrease the usage quantity of microwave switch so that system is much better on switching stability。
Active part: include multiple power amplifier, power amplifier is divided into seven generic module such as 800MHz, 900MHz, 1800MHz, 2000MHz, 2100MHz, 2300MHz, 2600MHz by working frequency range, each power amplifier peak power output is 50dBm, the radiofrequency signal that the switch switching of power amplifier receiving matrix comes, is amplified radiofrequency signal。This power amplifier test signal can stable for a long time be maintained at ± the power output error of about 1dB。
Signal source: the vector signal source (Agilent N5182A) of two cascades can realize the dynamic step length frequency sweep of 700MHz to 3GHz, and generation 800MHz signal, 900MHz signal, 1800MHz signal, 2100MHz signal, 2300MHz signal, 2600MHz signal are respectively used to the intermodulation index test of cdma system, gsm system, FDD-LTE system, WCDMA system, TD-LTE system。
Passive part: be made up of some low intermodulation 3dB electric bridges, duplexer, multiplefrequency mixer。3dB electric bridge realizes branch and the He Lu of signal, and duplexer is for realizing the separation of test semaphore inter-modulated signal；Multiplefrequency mixer realizes the conjunction road of inter-modulated signal；This part can adopt modular method for designing, realizes multiple intermodulation index test by different passive modules (duplexer and 3db electric bridge)。
Signals collecting/processing unit: model is MSW-800-2700。It is made up of FPGA digital signal processing unit, analog-digital converter, analog data acquisition unit etc.；IIR digital filter based is adopted to realize filtering the Intermodulation Interference product by producing in signal generator and system, owing to adopting digital algorithm, it is possible to realize real-time adjustment according to test system signal, improve system test sensitivity。
Computer: be attached with signal source and spectrum analyzer by gpib interface, be connected with signals collecting/processing unit by gpib interface；Computer processes gathering the numerical data come, concrete processing procedure: the link Insertion Loss in system is deposited in a computer, after system works, the data of link Insertion Loss arrange in signal source and spectrum analyzer by gpib interface, the simultaneous computer signal source transmitting power by collecting, first the transmitting power of duplexer carries out the running status of system and judges, the all normal then system of output such as signal source transmitting power and duplexer is normally carried out sweep check, then the signal power record that computer will come from spectrum analyzer collection again, then this value is the reflection intermodulation value of measured device, sampled value unit is dBm, if value is dBc, then carry out doing difference with the output of duplexer。
System Working Principle:
As shown in Figure 2: signal source is according to the descending test continuous wave of the power emission set, through signal processing, signal processing according to after realizing the filtering of system intermodulation product by entering power amplifier module (being made up of two-way amplification module) behind 3dB electric bridge combination road, its ATT of system attenuation coefficient adjustment decay that power amplifier module collects according to signal processing so that its power arriving test port reaches setting value；Then the signal after amplifying enters duplexer after 3dB electric bridge closes road again, and duplexer TX port connects equipment under test, and duplexer RX port is used for connecting spectrum analyzer；Duplexer coupling aperture is used for connecting power probe, and power probe real-time acquisition system output signal, all of RX port connects spectrum analyzer after closing road by multiport combiner；The test bandwidth of spectrum analyzer, RBW adjust in real time according to the control of computer。
Passive part port describes:
Test port: be used for connecting equipment under test, is divided into 800MHz test port, 900MHz test port, 1800MHz test port, 2000MHz to test port, 2100MHz test port, 2300MHz test port, 8 test ports altogether such as 2600MHz test port and reserved port etc. according to different test frequency ranges
Application effect:
Such as enter 2 intermodulation testing this utility model going out C type POI multisystem mixing platform for the 12 of the centralized purchasing of steel tower group of China and can well complete the test to system intermodulation, and the test of the frequency sweep/frequency that existing reflection intermodulation testing platform is only capable of in completion system intermodulation, see by testing data at the POI of net at present: the interference appearance in a lot of scenes to WCDMA of the intermodulation product of FDD-LTE2.1GHz and WCDMA。The scheme solving this fault at present mainly or adopts the reflection intermodulation suppression index improving POI multisystem mixing platform。Each POI manufacturer and relevant authority testing agency also do not possess this power of test at present, and can complete the test of above-mentioned all items after adopting the intermodulation instrument of this conceptual design；And this system platform is modular design due to what adopt, the requirement so that with the test of subsequent movement communication system can be upgraded flexibly。
This utility model supports that multisystem multiband is tested simultaneously, the Intermodulation Interference of the multiport such as multisystem mixing platform, multiplefrequency mixer arrowband passive device can be accurately tested by the test of this platform, promotion equipment manufacturer is that the intermodulation improving passive product carries out technological design and improvement, has indirectly promoted the benign development of existing mobile communications network。
Claims (10)
1. multisystem intermodulation testing platform, it is characterised in that: the signal source that includes being linked in sequence, switch matrix, active part, passive part, spectrum analyzer；Described passive part includes multiple duplexer, and the test port of each duplexer is used for connecting equipment under test。
2. multisystem intermodulation testing platform according to claim 1, it is characterised in that described active part includes multiple power amplifier, and the input of each power amplifier is connected with the outfan of switch matrix, and the outfan of each amplifier is connected with passive part。
3. multisystem intermodulation testing platform according to claim 1, it is characterised in that described passive part includes the 3dB electric bridge, duplexer and the multiplefrequency mixer that are linked in sequence；Two inputs of described 3dB electric bridge are connected with the outfan of two power amplifiers respectively, and the outfan of 3dB electric bridge is connected with the signal input part of duplexer；The coupling aperture of duplexer is connected with the input of multiplefrequency mixer；The outfan of multiplefrequency mixer is connected with spectrum analyzer。
4. multisystem intermodulation testing platform according to claim 3, it is characterised in that described 3dB electric bridge and duplexer are multiple。
5. multisystem intermodulation testing platform according to claim 3, it is characterised in that described multiplefrequency mixer is multiple。
6. multisystem intermodulation testing platform according to claim 3, it is characterised in that the gpib interface of described duplexer is connected with computer by signals collecting/processing unit。
7. multisystem intermodulation testing platform according to claim 1, it is characterised in that described switch matrix is connected with computer by signals collecting/processing unit。
8. multisystem intermodulation testing platform according to claim 1, it is characterised in that described spectrum analyzer is connected with computer。
9. multisystem intermodulation testing platform according to claim 1, it is characterised in that described signal source is multiple。
10. multisystem intermodulation testing platform according to claim 1, it is characterised in that described signal source is connected with computer。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521128922.7U CN205336291U (en) | 2015-12-30 | 2015-12-30 | Multisystem intermodulation test platform |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521128922.7U CN205336291U (en) | 2015-12-30 | 2015-12-30 | Multisystem intermodulation test platform |
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| CN205336291U true CN205336291U (en) | 2016-06-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253997A (en) * | 2016-08-10 | 2016-12-21 | 杭州紫光网络技术有限公司 | A kind of multiband intersection cross modulation test system |
| CN107769869A (en) * | 2016-08-18 | 2018-03-06 | 京信通信系统（中国）有限公司 | Multi-signal passive intermodulation test system |
| CN110677202A (en) * | 2019-10-20 | 2020-01-10 | 南京纳特通信电子有限公司 | Array antenna intermodulation and active impedance test system |
| CN110868261A (en) * | 2019-11-22 | 2020-03-06 | 南京派格测控科技有限公司 | OIP3 testing method of radio frequency power amplifier chip |
| CN114337879A (en) * | 2021-12-30 | 2022-04-12 | 京信射频技术(广州)有限公司 | Multi-system access platform and communication system |
-
2015
- 2015-12-30 CN CN201521128922.7U patent/CN205336291U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253997A (en) * | 2016-08-10 | 2016-12-21 | 杭州紫光网络技术有限公司 | A kind of multiband intersection cross modulation test system |
| CN106253997B (en) * | 2016-08-10 | 2018-10-19 | 杭州紫光网络技术有限公司 | A kind of multiband intersection cross modulation test system |
| CN107769869A (en) * | 2016-08-18 | 2018-03-06 | 京信通信系统（中国）有限公司 | Multi-signal passive intermodulation test system |
| CN110677202A (en) * | 2019-10-20 | 2020-01-10 | 南京纳特通信电子有限公司 | Array antenna intermodulation and active impedance test system |
| CN110868261A (en) * | 2019-11-22 | 2020-03-06 | 南京派格测控科技有限公司 | OIP3 testing method of radio frequency power amplifier chip |
| CN114337879A (en) * | 2021-12-30 | 2022-04-12 | 京信射频技术(广州)有限公司 | Multi-system access platform and communication system |
| CN114337879B (en) * | 2021-12-30 | 2023-11-24 | 京信射频技术(广州)有限公司 | Multi-system access platform and communication system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160622 Termination date: 20211230 |
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| CF01 | Termination of patent right due to non-payment of annual fee |