CN207869404U - A kind of wide bandwidth base station front end passive cross modulation test system - Google Patents
A kind of wide bandwidth base station front end passive cross modulation test system Download PDFInfo
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- CN207869404U CN207869404U CN201721542912.7U CN201721542912U CN207869404U CN 207869404 U CN207869404 U CN 207869404U CN 201721542912 U CN201721542912 U CN 201721542912U CN 207869404 U CN207869404 U CN 207869404U
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Abstract
The utility model discloses a kind of wide bandwidth base station front end passive cross modulation test systems, including main control computer, the first wideband signal source, the second wideband signal source, the first wideband power amplifer, the second wideband power amplifer, broadband receiver, USB power meters and switch-box；Include three independent switches in switch-box：First switch, second switch and third switch, and the first coupler, the second coupler and 3dB electric bridges are additionally provided in switch-box；Main control computer controls the first wideband signal source, the second wideband signal source, broadband receiver, switch-box and USB power meters by network-bus；The utility model switches transmission channel and receiving channel by switch-box, so that transmission power is switched to any one port Tx and connects different front end filter Tx inputs, while can switch any one port RX and connect different front end filter Rx inputs；Transmission power is monitored by switch-box coupled output ports.
Description
Technical field
The utility model is related to the technical field of measurement and test of radio communication base station front end filter module more particularly to a kind of width
Band base station front end passive cross modulation test system.
Background technology
The intermodulation testing of base station front-end module is an important test event of base station equipment, main testing base station front end mould
Block is when emitting downlink signal, by the interference inter-modulated signal of downlink signal generation fallen in upstream frequency.Traditional base station front end
The intermodulation testing of module is as shown in Figure 1, controlled the frequency of signal source 1 and signal source 2 by main control computer, respectively through power amplification
Device 1 and power amplifier 2 are exported after amplifying and are exported to tested module Tx input terminals by 3dB electric bridge mixing two paths of signals.By frequency spectrum
Analyzer connects the Rx port test front end filter Rx frequency range intermodulation output of front end filter, can test the reversed of tested module
Mutual tone pitch.The cross modulation test system of traditional base station front-end module can only generally test the test intermodulation of filter module one by one,
For the base station front-end module test with multiple filter modules, then need multiple connecting test system, testing efficiency it is low and
It is susceptible to faulty operation.
Invention content
The purpose of this utility model is that in view of the deficiencies of the prior art, multiple filter moulds can once be tested by providing one kind
Block cross modulation test system, and transmission power can be monitored in real time during the test.
The purpose of this utility model is achieved through the following technical solutions：A kind of wide bandwidth base station front end passive intermodulation is surveyed
Test system, including it is main control computer, the first wideband signal source, the second wideband signal source, the first wideband power amplifer, second wide
Band power amplifier, broadband receiver, USB power meters and switch-box；Include three independent switches in the switch-box：First
Switch, second switch and third switch, and the first coupler, the second coupler and 3dB electric bridges are additionally provided in switch-box；
The main control computer controls the first wideband signal source, the second wideband signal source, broadband reception by network-bus
Machine and switch-box control USB power meters by usb bus；First wideband signal source connects the first wideband power amplifer
Input terminal, the first coupler input of the first wideband power amplifer output end connecting valve case；Second wideband signal source connects
Connect the second wideband power amplifer input terminal, the second coupler input of the second wideband power amplifer output end connecting valve case
End；The output end of the output end of first coupler and the second coupler is separately connected the input terminal of 3dB electric bridges, and the one of 3dB electric bridges
With absorbed power, another output end connects first switch for a output end connection load；First switch connects the different ports Tx,
The different duplexer Tx input terminals of the different ports Tx connection base station front-end modules；Before the Rx input terminals connection base station of second switch
The different channels Rx of end module, output end connect broadband receiver；The public termination USB power meters of third switch, in addition both ends
Mouth is separately connected the coupled output of the coupled output and the second coupler of the first coupler.
Further, each switch can individually be controlled comprising communication control mainboard, main control computer in the switch-box
Switching.
Further, the first switch, second switch and third switch are the broadband mechanical switch that power is more than 100W.
The mutual commissioning of a kind of wide bandwidth base station front end passive cross modulation test system provided by the utility model and conventional diplexer
Test system is compared, and main control computer, two wideband signal sources, two wideband power amplifers, broadband receiver, USB have been used
Power meter and switch-box.Switch-box switches transmission channel and receiving channel, and transmission power is allow to switch to any one end Tx
Mouth connects different front end filter Tx inputs, while it is defeated to switch the different front end filter Rx of any one port RX connection
Enter；Transmission power is monitored by switch-box coupled output ports.
Description of the drawings
Fig. 1 is the cross modulation test system schematic diagram of traditional base station front-end module；
Fig. 2 is the utility model wide bandwidth base station front end passive cross modulation test system schematic diagram.
Specific implementation mode
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Fig. 2, a kind of wide bandwidth base station front end passive cross modulation test system provided by the utility model, including master control meter
Calculation machine 100, the first wideband signal source 201, the second wideband signal source 202, the first wideband power amplifer 301, the second broadband work(
Rate amplifier 302, broadband receiver 400, USB power meters 500 and switch-box 600；In the switch-box 600 solely comprising three
Vertical switch：First switch 701, second switch 702 and third switch 703；
In switch-box 600, S is monitored using the first coupler 801, the second coupler 8021In and S2The input of the ports in
Transmission power switches the output end and USB power meters of the first coupler 801 and the second coupler 802 using third switch 703
500 connection, can timesharing check S1inAnd S2inThe transmission power of port input, using 3dB electric bridges 900 by S1And S2Signal mixes
Output is switched to different Tx output ends by first switch 701 to first switch 701, and the connection of Tx output ends is tested front-end filtering
The different channels Tx of device module；The Rx input terminals connection of second switch 702 is tested the different channels Rx of front end filter module, the
The output end of two switches 702 connects broadband receiver 400；
Main control computer 100 controls the first wideband signal source 201, the second wideband signal source 202, broadband by network-bus
Receiver 400 and switch-box 600 control USB power meters 500 by usb bus；
First wideband signal source 201 connects 301 input terminal of the first wideband power amplifer, the first wideband power amplifer
801 input terminal of the first coupler of 301 output end connecting valve casees 600；Second wideband signal source 202 connects the second broadband work(
Second coupler 802 of 302 input terminal of rate amplifier, 302 output end connecting valve case 600 of the second wideband power amplifer is defeated
Enter end；The output end of the output end of first coupler 801 and the second coupler 802 is separately connected the input terminal of 3dB electric bridges 900；
With absorbed power, another output end connects first switch 701 for the output end connection load 1000 of 3dB electric bridges 900；First opens
Signal is switched to the different ports Tx after closing 701 mixing, and the different ports Tx can connect the different duplexer of base station front-end module
Tx input terminals；The Rx input terminals connection of second switch 702 is tested the different channels Rx of front end filter module, second switch 702
Output end connect broadband receiver 400；The public termination USB power meters 500 of third switch 703, two-port is separately connected
The coupled output of first coupler 801 and the second coupler 802 detects two input terminal F1And F2Transmission power；Switch-box
Include communication control mainboard, the controllable switching each switched of main control computer 100 in 600.
The utility model first switch 701, second switch 702 and third switch 703 are the broadband machine that power is more than 100W
Tool switchs；Coupler and electric bridge are broadband 500~3000MHz electric bridges.
Wide bandwidth base station front end provided by the utility model passive cross modulation test system increase switch-box switching transmission channel and
Receiving channel, allows transmission power to switch the different duplexer Tx input terminals of base station front-end module, and broadband receiver can be cut
Change the different duplexer Rx output ends of base station front-end module.
It is assumed that the tranmitting frequency of the first wideband signal source 201 is f1, the tranmitting frequency of the second wideband signal source 202 is f2, wide
Receives frequency with receiver 400 is f3, and meet f3=| m f1-n f2|, m, n are positive integer, and m+n is the rank of inter-modulated signal
Number.
The test process of the utility model is as follows：
1：According to the frequency range of tested module, test frequency f is set1、f2And f3, connection tested module end corresponding with switch-box
Mouthful.
2：Main control computer controls the first switch switching of switch-box, the access of selection transmitting signal；Control switch-box
Second switch switches inter-modulated signal receiving channel.
3：The tranmitting frequency that main control computer controls the first wideband signal source is f1And transmission is opened, it is wide by control first
The transmission amplitude in band signal source adjusts the transmission power of the first broadband signal source signal, and monitors output work by USB power meters
Rate size, and it is adjusted to desired value.
4：The tranmitting frequency that main control computer controls the second wideband signal source is f2And transmission is opened, it is wide by control second
The transmission amplitude in band signal source adjusts the transmission power of the second broadband signal source signal, and monitors output work by USB power meters
Rate size, and it is adjusted to desired value.
5：The second switch that main control computer controls switch-box switches inter-modulated signal receiving channel, controls broadband receiver
Receives frequency reads the signal amplitude that broadband receiver receives.
6：Change the tranmitting frequency f of the first wideband signal source1, the second wideband signal source tranmitting frequency f2, repeat the above step
Rapid 3-5；All combination of frequencies that need to be tested are tested, that is, test a duplexer channel of base station front-end module.
7：Change the first switch of switch-box, second switch repeats above step 3-5；Test all base station front ends mould
The duplexer filter of block.
8：Measurement terminates, and preserves test result.
Embodiment
The present embodiment uses wideband signal source for Agilent MXG 5181A, and broadband receiver is Agilent MXA
9020A, power are calculated as Agilent U2000, entire to test system also comprising a switch-box.
The base stations a binary channels GSM900 front-end module is tested, including two GSM900 duplexer filters, duplexer filter
Transmitting Tx frequency ranges are 925-960MHz, and reception Rx frequency ranges are 880-915MHz.
By the ports Tx of the first duplexer filter of measured piece and the second duplexer filter respectively with the corresponding Tx1 of switch-box
It is connected with Tx2 output ports.By the ports Rx and switch-box of the first duplexer filter of measured piece and the second duplexer filter
Corresponding Rx1 with Rx2 input ports connect.Duplexer filter common end connects low intermodulation load.
First wideband signal source transmission frequency f is set1=925MHz, the second wideband signal source transmission frequency f2=960MHz；
The first switch switching signal for controlling switch-box is exported to Tx1, and signal is exported to the ends TX of the first duplexer filter
Mouthful.The second switch for controlling switch-box switches broadband receiver to Rx1 inputs, and broadband receiver receives the ends duplexer filter Rx
Mouth intermodulation.
The third switching of switch-box is controlled to the coupled end of the first coupler；The coupling of such first Coupler ports
Signal can be read by power meter；If there is deviation, Regulate signal as low as desired value greatly.
The third switching of switch-box is controlled to the coupled end of the second coupler；The coupling of such second Coupler ports
Signal can be read by power meter；If there is deviation, Regulate signal as low as desired value greatly.
Broadband receiver receives frequency f is set3=2f1-f2=890MHz reads the signal amplitude received, completes primary
Point 3 rank intermodulation of frequency measure.
Change f1Or f2And f3Frequency, the intermodulation of multiple Frequency points can be measured by repeating the above steps.Complete the first duplex
The intermodulation testing of filter.
The first switch switching signal for controlling switch-box is exported to Tx2, and signal is exported to the ends Tx of the second duplexer filter
Mouthful.The second switch for controlling switch-box switches broadband receiver to Rx2 inputs, and broadband receiver receives the second duplexer filter
The intermodulation of the ports Rx.
The third switching of switch-box is controlled to the coupled end of the first coupler, the coupling of such first Coupler ports
Signal can be read by power meter.If there is deviation, Regulate signal as low as desired value greatly.
The third switch 3 of control switch-box switches to the coupled end of the second coupler, the coupling of such second Coupler ports
Closing signal can be read by power meter.If there is deviation, Regulate signal as low as desired value greatly.
Broadband receiver receives frequency f is set3=2f1-f2=890MHz reads the signal amplitude received, completes primary
Point 3 rank intermodulation of frequency measure.
Change f1Or f2And f3Frequency, the intermodulation of multiple Frequency points can be measured by repeating the above steps.Complete the second duplex
The intermodulation testing of filter.
Test is completed, and test result is preserved.
Claims (3)
1. a kind of wide bandwidth base station front end passive cross modulation test system, which is characterized in that including main control computer (100), first wide
Band signal source (201), the second wideband signal source (202), the first wideband power amplifer (301), the second wideband power amplifer
(302), broadband receiver (400), USB power meters (500) and switch-box (600)；In the switch-box (600) solely comprising three
Vertical switch：First switch (701), second switch (702) and third switch (703), switch-box (600) is interior to be additionally provided with first
Coupler (801), the second coupler (802) and 3dB electric bridges (900)；
The main control computer (100) controls the first wideband signal source (201), the second wideband signal source by network-bus
(202), broadband receiver (400) and switch-box (600) control USB power meters (500) by usb bus；
First wideband signal source (201) connects the first wideband power amplifer (301) input terminal, the amplification of the first broadband power
The first coupler (801) input terminal of device (301) output end connecting valve case (600)；Second wideband signal source (202) connection the
Two wideband power amplifers (302) input terminal, the of the second wideband power amplifer (302) output end connecting valve case (600)
Two couplers (802) input terminal；The output end of first coupler (801) and the output end of the second coupler (802) are separately connected
The input terminal of 3dB electric bridges (900), the output end connection load (1000) of 3dB electric bridges (900) with absorbed power, another
Output end connects first switch (701)；First switch (701) connects the different ports Tx, before the different ports Tx connect base station
The different duplexer Tx input terminals of end module；The Rx that the Rx input terminals connection base station front-end module of second switch (702) is different is logical
Road, output end connect broadband receiver (400)；Third switchs the public termination USB power meters (500) of (703), in addition two-port
It is separately connected the coupled output of the coupled output and the second coupler (802) of the first coupler (801).
2. a kind of wide bandwidth base station front end passive cross modulation test system according to claim 1, which is characterized in that the switch
Include communication control mainboard in case (600), main control computer (100) can individually control the switching each switched.
3. a kind of wide bandwidth base station front end passive cross modulation test system according to claim 1, which is characterized in that described first
Switch (701), second switch (702) and third switch (703) are the broadband mechanical switch that power is more than 100W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721542912.7U CN207869404U (en) | 2017-11-17 | 2017-11-17 | A kind of wide bandwidth base station front end passive cross modulation test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721542912.7U CN207869404U (en) | 2017-11-17 | 2017-11-17 | A kind of wide bandwidth base station front end passive cross modulation test system |
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| Publication Number | Publication Date |
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| CN207869404U true CN207869404U (en) | 2018-09-14 |
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ID=63475523
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| CN201721542912.7U Active CN207869404U (en) | 2017-11-17 | 2017-11-17 | A kind of wide bandwidth base station front end passive cross modulation test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257638A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Broadband passive intermodulation test and positioning system |
-
2017
- 2017-11-17 CN CN201721542912.7U patent/CN207869404U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257638A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Broadband passive intermodulation test and positioning system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A passive intermodulation test system for broadband base station front end Effective date of registration: 20200728 Granted publication date: 20180914 Pledgee: Hangzhou High-tech Financing Guarantee Co.,Ltd. Pledgor: HANGZHOU JOINTCOM COMMUNICATION TECHNOLOGY Co.,Ltd. Registration number: Y2020330000545 |