CN105577294B - Multifunctional handheld passive intermodulation analyzer - Google Patents
Multifunctional handheld passive intermodulation analyzer Download PDFInfo
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- CN105577294B CN105577294B CN201410538963.7A CN201410538963A CN105577294B CN 105577294 B CN105577294 B CN 105577294B CN 201410538963 A CN201410538963 A CN 201410538963A CN 105577294 B CN105577294 B CN 105577294B
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Abstract
The invention discloses a multifunctional handheld passive intermodulation analyzer, which comprises two paths of signal source generating circuits, a 3db electric bridge, a duplex combiner, a change-over switch, a first receiver, a second receiver and a third receiver, wherein two paths of passive intermodulation excitation signals generated by the signal source generating circuits are amplified and then input to the 3db electric bridge for combining, and are output to the duplex combiner for processing; the first receiver is used for analyzing an intermodulation signal of an RX receiving end of the duplex combiner; the second receiver is used for analyzing the second-order intermodulation/second harmonic of the DCS end of the duplex combiner; the third receiver is connected with the coupling port of the duplex combiner or the N port of the analyzer through the selector switch, and is used for analyzing the isolation or the frequency spectrum. The invention realizes the function detection diversification of the passive intermodulation analyzer, realizes the high integration of the analyzer, reduces the volume and the weight of the analyzer and is convenient to carry.
Description
Technical Field
The invention relates to the technical field of passive intermodulation testing in a mobile communication antenna feed system, in particular to a handheld passive intermodulation analyzer with multiple functions and small size.
Background
With the rapid development of modern mobile communication technology, data and voice data passing through a fixed bandwidth are increasing day by day, a plurality of signals with different frequencies exist in the same transmission medium, and because the transmission medium has a certain nonlinear characteristic, when the signals with different frequencies are mixed together and input into the transmission medium with the nonlinear characteristic, a spurious Inter Modulation (PIM for short) is generated.
When the passive intermodulation falls within the reception band of the base station, the sensitivity of the receiver may be reduced, resulting in a reduction in the call quality or carrier-to-interference ratio (C/I) of the system. On the basis that field engineers often need to carry instruments to perform passive intermodulation troubleshooting, the demand for multifunctional handheld passive intermodulation instruments with small size, light weight and multiple functions in mobile communication is increasingly strong.
In the prior art, there are some designs of passive intermodulation analyzers, as shown in fig. 1 and fig. 2, where the passive intermodulation analyzer shown in fig. 1 includes a first signal source, a second signal source, a 3db electrical bridge, a duplexer, and two receivers, the first signal source and the second signal source pass through respective power amplifiers and are input to a TX end of the duplexer through the 3db electrical bridge, and an RX end and a coupling port of the duplexer are each connected to a receiver, which has a disadvantage that it is impossible to analyze and measure second-order intermodulation/second-order harmonic, spectrum, and isolation.
The passive intermodulation analyzer shown in fig. 2 comprises a first signal source, a second signal source, a 3db bridge, a duplexer and a receiver, wherein the first signal source and the second signal source are input to a GSM terminal of the duplexer through the 3db bridge after passing through respective power amplifiers, and a DCS terminal of the duplexer is connected with the receiver, which has the defect that only second-order intermodulation/second-order harmonic can be analyzed and measured.
The two existing passive intermodulation analyzers have the defects of small functions, large instrument size, inconvenience in carrying and the like due to low integration level of all parts in the instrument, so that the multifunctional passive intermodulation analyzer with high integration level is necessary to solve the defects in the prior art aiming at the problems of small functions, large instrument size and inconvenience in carrying in the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a multifunctional handheld passive intermodulation analyzer, which is added with a second-order intermodulation/second-order harmonic test function, an isolation test function and a spectrum analysis function so as to realize the function detection diversification of the passive intermodulation analyzer.
In order to achieve the purpose, the invention provides the following technical scheme: a multi-functional handheld passive intermodulation analyzer, comprising: two-way signal source generating circuit, 3db electric bridge, duplex combiner, receiver and change over switch, duplex combiner has TX _ GSM end, RX _ GSM end, DCS end, coupling port and ANT end, the receiver includes first receiver, second receiver and third receiver, wherein:
the two paths of signal source generating circuits are used for generating two paths of passive intermodulation excitation signals and inputting the two paths of passive intermodulation excitation signals to the 3db electric bridge;
the 3db electric bridge combines the two paths of passive intermodulation excitation signals, and outputs the combined signals to the duplex combiner through a TX end of the duplex combiner for filtering and signal separation processing;
the first receiver is connected with an RX _ GSM end of the duplex combiner and is used for analyzing intermodulation of a passive intermodulation signal generated by the TX _ GSM transmitting end and falling into an RX _ GSM receiving end;
the second receiver is connected with the DCS end of the duplex combiner and is used for analyzing the intermodulation of the second-order intermodulation/second-order harmonic wave generated by the GSM frequency band falling into the DCS frequency band;
and the third receiver is connected with the coupling port of the duplex combiner or the N port of the analyzer through the switch and is used for analyzing the isolation or the frequency spectrum.
Preferably, each of the signal source generating circuits includes a signal source generator and a power amplifier connected to an output terminal of the signal source generator, and the passive intermodulation excitation signal generated by the signal source generator is amplified by the respective power amplifier and then output to the 3db bridge.
Preferably, one end of the switch is switched to the coupling port or the N port, and the other end of the switch is connected to the third receiver, and the coupling port signal and the N port signal are switched by the switch and are output to the third receiver.
Preferably, one end of the 3db bridge is further connected to a first load, and the first load can be a 51 ohm load.
Preferably, the duplex combiner is formed by integrating a duplexer and a combiner, and the integral integration level of the analyzer is improved, so that the size and the weight of the analyzer are correspondingly reduced and lightened.
Preferably, the analyzer further includes a DIN port to which an ANT terminal of the duplex combiner is connected.
When the second-order intermodulation/second-order harmonic test is carried out, the DIN interface is connected with the input end of the tested device, and the output end of the tested device is connected with a second load. And the second-order intermodulation/second harmonic enters a corresponding receiver for analysis through a DCS port of the duplex combiner, so that a second-order intermodulation/second harmonic test result is obtained.
When the isolation degree test is carried out, the DIN port is connected with the input end of the tested device, the output end of the tested device is connected with the N port, the input end of the change-over switch is connected with the N port, and the third receiver carries out analysis calculation on the received power to obtain an isolation degree test result.
When the spectrum analysis test is carried out, the output end of the tested device is connected with the N port, the input end of the change-over switch is connected with the N port, and the third receiver carries out analysis calculation on the received power to obtain a spectrum analysis test result.
The invention has the beneficial effects that:
1. the passive intermodulation analyzer can simultaneously test the second-order intermodulation/second-order harmonic test function, the isolation test function and the spectrum analysis function by adding the receiver, thereby realizing more convenience, stronger function and more diversification of the analyzer.
2. The invention integrates the duplexer and the combiner, realizes the high integration of the instrument, thereby reducing the volume and the weight of the instrument and being convenient to carry.
3. The invention solves the problem that the second-order intermodulation and the second harmonic can be tested under the condition of not increasing any peripheral equipment through the change-over switch.
Drawings
Fig. 1 and 2 are schematic block diagrams of two prior art passive intermodulation analyzers, respectively;
FIG. 3 is a schematic block diagram of the multi-functional handheld passive intermodulation analyzer of the present invention;
fig. 4 is a schematic block diagram of a first embodiment of the multifunctional handheld passive intermodulation analyzer of the present invention;
fig. 5 is a schematic block diagram of a second embodiment of the multifunctional handheld passive intermodulation analyzer of the present invention;
fig. 6 is a schematic block diagram of a third embodiment of the multifunctional handheld passive intermodulation analyzer of the present invention.
Detailed Description
The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
In order to effectively solve the problems of large volume and few functions of the conventional passive intermodulation analyzer, the invention can simultaneously realize the tests of a second-order intermodulation/second harmonic test function, an isolation test function and a spectrum analysis function by integrating and adding a receiver; the invention integrates the duplexer and the combiner, realizes the high integration of the instrument, thereby reducing the volume and the weight of the instrument and being convenient to carry.
The invention discloses a multifunctional handheld passive intermodulation analyzer which is mainly applied to passive intermodulation test in a mobile communication antenna feeder system. As shown in fig. 3, the passive intermodulation excitation signal generating circuit comprises a signal source generator 1, a signal source generator 2, a power amplifier 1, a power amplifier 2, a 3db bridge, a duplex combiner, a receiver 1, a receiver 2, a receiver 3 and a change-over switch, wherein an output end of the signal source generator 1 is connected with an input end of the power amplifier 1, an output end of the signal source generator 2 is connected with an input end of the power amplifier 2, the signal source generator 1, the power amplifier 1, the signal source generator 2 and the power amplifier 2 respectively form a signal source generating circuit, and the signal source generator 1 and the signal source generator 2 are used for respectively generating a path of passive intermodulation excitation signal.
The signal source generator 1 or the signal source generator 2 includes a first FPGA (field programmable gate array) chip, an ADC (analog-to-digital converter) chip and a first frequency synthesizer, and both generate the passive intermodulation excitation signals according to the following principle: the first FPGA chip generates CW signals, the CW signals are sent to the DAC device for analog-to-digital conversion, and radio frequency signals generated by conversion are synthesized with the local first frequency synthesizer to obtain required radio frequency signals, namely required passive intermodulation excitation signals.
The two paths of passive intermodulation excitation signals are amplified by respective power amplifiers and then input to a 3db electric bridge. One output port of the 3db bridge is connected to a first load, in specific implementation, the first load can select a 51-ohm load, the other output port is connected to a TX _ GSM end of the duplex combiner, and the 3db bridge synthesizes the two paths of amplified excitation signals and inputs the two paths of synthesized excitation signals to the duplex combiner through the TX _ GSM end of the duplex combiner for filtering and signal separation processing.
The duplex combiner integrates a GSM duplexer and a DCS filter and is used for separating and synthesizing GSM uplink and downlink signals and DCS signals. The device is provided with a TX _ GSM end for receiving GSM signals, an RX _ GSM end for outputting GSM signals, a DCS end for outputting DCS signals, a coupling port and an ANT port, wherein reverse power detection signals are output from the coupling port of the duplex combiner, the signals enter a receiver 3 for standing wave test or standing wave positioning test, and the ANT port is connected with a DIN port of an analyzer.
The receivers 1-3 are used for performing spectrum analysis on collected radio frequency signals (such as GSM frequency band intermodulation signals, DCS frequency band intermodulation signals and the like), each receiver comprises a low-noise amplification circuit, a gain amplification circuit, a mixer, a second frequency synthesizer, an anti-aliasing filter, a DAC (digital-to-analog converter) chip and a second FPGA chip, and the working principles are as follows: the receiver firstly amplifies the received radio frequency signal with low noise, then enters a gain amplifying circuit for gain amplification, then is sent to a mixer to be synthesized with a local second frequency synthesizer, generates an intermediate frequency signal and is sent to an anti-aliasing filter for filtering, finally the signal is sent to a DAC chip for digital-to-analog conversion, and the converted digital signal enters an FPGA for Fourier conversion and then is subjected to received power statistical analysis.
Specifically, the receiver 1 is connected to an RX end of the duplex combiner, and configured to analyze intermodulation, where a passive intermodulation signal generated by the TX _ GSM transmitting end falls into an RX _ GSM receiving end; the receiver 2 is connected with the DCS end of the duplex combiner and is used for analyzing the intermodulation of the second-order intermodulation/second-order harmonic wave generated by the GSM frequency band falling into the DCS frequency band; the receiver 3 is connected with a coupling port of the duplex combiner or connected with an N port of the analyzer and used for analyzing received indexes such as frequency points, power intensity and the like.
Because the receiver 3 only has one input port, in order to realize the switching connection between the receiver and the coupling port and the N port, the invention arranges a switch at the node of the coupling port and the N port input line, that is, the input end of the switch is connected with the coupling port or the N port, the output end is connected to the receiver 3, and the coupling port signal and the N port signal are switched and input to the receiver 3 through the switch. The N port of the analyzer is used for signal input for isolation test on one hand and used for signal input for frequency spectrograph test on the other hand.
The innovation points of the invention are mainly as follows: except that the three-order/multi-order intermodulation test function, the intermodulation positioning function, the standing wave test function and the standing wave positioning function which are included in the prior art can be realized, the two-order intermodulation/second harmonic test function, the isolation test function and the frequency spectrum analysis function are also added, specifically:
as shown in fig. 4, when performing the intermodulation test that the second order intermodulation/second harmonic generated in the GSM band falls into the DCS band, the input terminal of the device under test is connected to the DIN port of the analyzer, and the output terminal is connected to a second load, the specific detection principle is as follows: two paths of passive intermodulation excitation signals generated by a signal source generator 1 and a signal source generator 2 respectively enter a power amplifier 1 and a power amplifier 2 for amplification, the two paths of amplified excitation signals enter a duplex combiner after being combined by a 3dB electric bridge, then the excitation signals are output to a tested device from an ANT port of the duplex combiner, second-order intermodulation/second-order harmonic generated by the tested device enters a receiver 2 through a DCS port of the duplex combiner for analysis, and an intermodulation test result that the second-order intermodulation/second-order harmonic generated by a GSM frequency band falls into the DCS frequency band can be obtained.
The embodiment shown in fig. 4 describes a test that when GSM and DCS are used in a common station, the uplink and downlink second-order intermodulation or second-order harmonic frequency of GSM falls into the uplink and downlink frequency range of DCS to cause interference to the system, and in particular, performs an analysis test on the uplink second-order intermodulation or second-order harmonic interference generated in the GSM frequency band. Of course, the present invention is not limited to the second order intermodulation/second order harmonic test of the two, and can also perform the second order intermodulation/second order harmonic test when the GSM and TD-SCDMA are co-sited.
As shown in fig. 5, during the isolation test, the input terminal of the device under test is connected to the DIN port of the analyzer, the output terminal is connected to the N port of the analyzer, and meanwhile, the input terminal of the switch is switched to be connected to the N port, so that the receiver 3 is connected to the N port, during the specific test, the excitation signal output from the ANT port of the duplex combiner is output to the device under test through the DIN port, the input signal for the isolation test is input to the receiver 3 through the N port, and the receiver 3 analyzes and calculates the received power to obtain the isolation test result.
As shown in fig. 6, when performing the spectrum analysis test, the output terminal of the device under test is connected to the N port, and the input terminal of the switch is connected to the N port, that is, the receiver 3 is connected to the N port. During specific testing, the receiver 3 performs analysis and calculation on the input signal for the spectrum analysis test input by the N ports to obtain a spectrum analysis test result.
Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but includes various alternatives and modifications without departing from the scope of the present invention, which is defined by the claims of the present patent application.
Claims (9)
1. A multifunctional handheld passive intermodulation analyzer, comprising two signal source generating circuits, a 3db bridge, a duplex combiner, a receiver and a switch, wherein the duplex combiner has a TX _ GSM terminal, an RX _ GSM terminal, a DCS terminal, a coupling port and an ANT terminal, and the receiver comprises a first receiver, a second receiver and a third receiver, wherein:
the two paths of signal source generating circuits are used for generating two paths of passive intermodulation excitation signals and inputting the two paths of passive intermodulation excitation signals to the 3db electric bridge;
the 3db electric bridge combines the two paths of passive intermodulation excitation signals, and outputs the combined signals to the duplex combiner through a TX end of the duplex combiner for filtering and signal separation processing;
the first receiver is connected with an RX _ GSM end of the duplex combiner and is used for analyzing intermodulation of a passive intermodulation signal generated by the TX _ GSM transmitting end and falling into an RX _ GSM receiving end;
the second receiver is connected with the DCS end of the duplex combiner and is used for analyzing the intermodulation of the second-order intermodulation/second-order harmonic wave generated by the GSM frequency band falling into the DCS frequency band;
and the third receiver is connected with the coupling port of the duplex combiner or the N port of the analyzer through the switch and is used for analyzing the isolation or the frequency spectrum.
2. The multi-functional handheld passive intermodulation analyzer of claim 1, wherein each of the signal source generating circuits comprises a signal source generator and a power amplifier connected to an output of the signal source generator, and the passive intermodulation excitation signals generated by the signal source generator are amplified by the respective power amplifier and then output to the 3db bridge.
3. The multi-functional handheld passive intermodulation analyzer of claim 1, wherein the switch is connected to the coupling port or N-port at one end and to the third receiver at the other end, and the coupling port signal and N-port signal are switched by the switch and output to the third receiver.
4. The multi-functional handheld passive intermodulation analyzer of claim 1 wherein the 3db bridge is further terminated by a first load.
5. The multi-functional handheld passive intermodulation analyzer of claim 1, wherein the duplex combiner is integrated from a diplexer and a combiner.
6. The multi-functional handheld passive intermodulation analyzer of any of claims 1-5, further comprising a DIN port to which an ANT terminal of the duplex combiner is connected.
7. The multi-functional handheld passive intermodulation analyzer of claim 6 wherein the DIN interface is connected to a device under test input and the device under test output is connected to a second load when performing second order intermodulation/second order harmonic testing.
8. The multi-functional handheld passive intermodulation analyzer of claim 6, wherein in performing the isolation test, the DIN port is connected to the input of the device under test, the output of the device under test is connected to the N port, and the input of the switch is connected to the N port.
9. The multi-functional handheld passive intermodulation analyzer of claim 6, characterized in that, when performing spectrum analysis test, the output terminal of the device under test is connected to the N port, and the input terminal of the switch is connected to the N port.
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| CN105099586B (en) * | 2015-09-11 | 2017-11-21 | 中国电子科技集团公司第四十一研究所 | A kind of isolator passive cross modulation test device and method based on cavity filtering |
| CN108107345A (en) * | 2017-12-12 | 2018-06-01 | 广州兴森快捷电路科技有限公司 | Passive cross modulation test device |
| CN110166147B (en) * | 2019-05-15 | 2020-01-21 | 杭州紫光网络技术有限公司 | Base station antenna intermodulation fault positioning test system and method |
| CN114062780A (en) * | 2020-08-10 | 2022-02-18 | 南京纳特通信电子有限公司 | Passive intermodulation power harmonic comprehensive test device and test method |
| CN112305307B (en) * | 2020-12-21 | 2021-03-23 | 深圳市鼎阳科技股份有限公司 | Third-order intermodulation measurement method of spectrum analyzer and spectrum analyzer |
| CN116054869B (en) * | 2023-03-31 | 2023-09-12 | 深圳市德雄科技有限公司 | Integrated signal combiner |
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| CN102025432A (en) * | 2010-12-17 | 2011-04-20 | 镇江市澳华测控技术有限公司 | Forward and reverse passive inter-modulation (PIM) testing device and method for isolator |
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| CN101478700A (en) * | 2008-12-11 | 2009-07-08 | 杭州紫光网络技术有限公司 | Integrated passive intermodulation analyzer |
| CN202002984U (en) * | 2011-01-18 | 2011-10-05 | 南京纳特通信电子有限公司 | Multi-frequency-band passive intermodulation test instrument |
| CN202008510U (en) * | 2011-01-18 | 2011-10-12 | 南京纳特通信电子有限公司 | Comprehensive tester for passive isolator |
| CN103368665A (en) * | 2012-03-30 | 2013-10-23 | 中国联合网络通信有限公司广东省分公司 | Multi-signal passive intermodulation test method, equipment and system |
| CN202631635U (en) * | 2012-04-16 | 2012-12-26 | 罗森伯格（上海）通信技术有限公司 | Radio frequency test system |
| CN103684638B (en) * | 2013-12-17 | 2016-10-05 | 中国电子科技集团公司第四十一研究所 | A kind of high-power intermodulation distortion method of testing |
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| CN102025432A (en) * | 2010-12-17 | 2011-04-20 | 镇江市澳华测控技术有限公司 | Forward and reverse passive inter-modulation (PIM) testing device and method for isolator |
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