CN103701547B - Realize cross modulation test system and method that in intermodulation testing, remaining intermodulation reduces - Google Patents
Realize cross modulation test system and method that in intermodulation testing, remaining intermodulation reduces Download PDFInfo
- Publication number
- CN103701547B CN103701547B CN201410008797.XA CN201410008797A CN103701547B CN 103701547 B CN103701547 B CN 103701547B CN 201410008797 A CN201410008797 A CN 201410008797A CN 103701547 B CN103701547 B CN 103701547B
- Authority
- CN
- China
- Prior art keywords
- signal
- inter
- intermodulation
- modulated signal
- measured piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The present invention relates to a kind of cross modulation test system realizing remaining intermodulation reduction in intermodulation testing and method, including combiner; Duplexer filter, in order to measured piece or calibrating device and to receive measured piece or inter-modulated signal that calibrating device produces by closing the output of road signal; Receiver, in order to receive the vector superposed signal of the inter-modulated signal that the inter-modulated signal produced in duplexer filter produces with measured piece or calibrating device; Several bonders; Nonlinear circuit, produces internal reference inter-modulated signal in order to the signal to be tested after receiving bonder coupling and sends to receiver. What adopt this kind of structure realizes cross modulation test system and the method that in intermodulation testing, remaining intermodulation reduces, the remaining intermodulation making whole test system reaches less level, the impact on test result of the intermodulation characteristic of reduction duplexer filter, even if the intermodulation value of duplexer filter than the high 15～20dB of load can also the intermodulation value of proper testing measured piece, there is wider application scope.
Description
Technical field
The present invention relates to communication technical field, particularly relate to intermodulation testing field, specifically refer to a kind of cross modulation test system realizing remaining intermodulation reduction in intermodulation testing and method.
Background technology
Traditional cross modulation test system is as shown in Figure 1, after two-way merit continuous wave signal closes road, access duplexer filter transmitting terminal, through common port output to measured piece, measured piece product produces inter-modulated signal and reflexes to duplexer reception passage, receiver measure the amplitude size of inter-modulated signal. In this measurement system, receiver measurement to inter-modulated signal be the vector superposed result of the intermodulation that intermodulation and the measured piece that duplexer filter produces produces. The intermodulation of measured piece could be had accurate measurement by the duplexer filter needing self intermodulation characteristic fabulous, generally requires little more than the 15dB of intermodulation value of self intermodulation ratio measured piece of duplexer.
Summary of the invention
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, it is provided that a kind of be capable of reducing remaining intermodulation, reduce duplexer filter the intermodulation characteristic impact on test result, go for different rank intermodulation testing, there is broader applications scope realize cross modulation test system and the method that in intermodulation testing, remaining intermodulation reduces.
To achieve these goals, the present invention realize in intermodulation testing cross modulation test system that remaining intermodulation reduces and method has following composition:
This realizes the cross modulation test system that in intermodulation testing, remaining intermodulation reduces, and it is mainly characterized by, and described system includes:
Combiner, closes road signal in order to output after inter-modulated signal to be tested is closed road;
Duplexer filter, in order to by closing the inter-modulated signal that described conjunction road signal output is produced by road signal output part to the measured piece described in measured piece or calibrating device reception or calibrating device;
Receiver, in order to receive the vector superposed signal of the inter-modulated signal that the inter-modulated signal produced in described duplexer filter produces with described measured piece or calibrating device;
Several bonders, in order to output after being coupled by signal to be tested;
Nonlinear circuit, produces internal reference inter-modulated signal in order to the signal to be tested after receiving described bonder coupling and sends to described receiver.
It is preferred that described bonder is one, described bonder is arranged between described combiner and duplexer filter or described bonder is connected with the conjunction road signal output part of described duplexer filter.
It is preferred that the described bonder bonder identical and described with the way of inter-modulated signal to be tested and each road inter-modulated signal one_to_one corresponding to be tested, each described bonder is arranged between a corresponding road inter-modulated signal to be tested and described combiner.
It is preferred that described nonlinear circuit is frequency mixer or diode.
It is preferred that described calibrating device is the load lower than systemic presupposition limit value of the intermodulation value.
The invention still further relates to and a kind of realize in intermodulation testing the intermodulation testing method that remaining intermodulation reduces based on described system, it is mainly characterized by, and described method comprises the following steps:
(1) receiver described in receives the internal reference inter-modulated signal of described nonlinear circuit output and measures amplitude and the phase value of this signal;
(2) disconnect the communication between described measured piece and described duplexer filter and set up the communication between described calibrating device and described duplexer filter;
(3) inter-modulated signal to be tested inputted described combiner and record the calibration signal that present receiving machine receives from described duplexer filter;
(4) disconnect the communication between described calibrating device and described duplexer filter and set up the communication between described measured piece and described duplexer filter;
(5) inter-modulated signal to be tested inputted described combiner and record the inter-modulated signal to be calibrated that present receiving machine receives from described duplexer filter;
(6) the inter-modulated signal value of measured piece is calculated according to described internal reference inter-modulated signal, calibration signal and signal to be calibrated.
It is preferred that the described inter-modulated signal value calculating measured piece according to described internal reference inter-modulated signal, calibration signal and signal to be calibrated, comprise the following steps:
(61) phase value of outside actual measurement inter-modulated signal is determined according to the phase place of described internal reference inter-modulated signal and signal to be calibrated;
(62) signal to be calibrated is deducted calibration signal and obtains the inter-modulated signal value of measured piece.
Have employed the cross modulation test system realizing remaining intermodulation reduction in intermodulation testing in this invention and method, it is capable of reducing remaining intermodulation, low intermodulation load be easier realize, the remaining intermodulation making whole test system reaches less level, the impact on test result of the intermodulation characteristic of reduction duplexer filter, even if the intermodulation value of duplexer filter can also the intermodulation value of proper testing measured piece than the high 15～20dB of load, both may be used for the test of reflection intermodulation and can be used for the test of transmission intermodulation, go for the intermodulation testing of different rank, there is wider application scope.
Accompanying drawing explanation
Fig. 1 is the structural representation of cross modulation test system in prior art.
Fig. 2 is the structural representation realizing in intermodulation testing the cross modulation test system that remaining intermodulation reduces of the present invention.
Detailed description of the invention
In order to more clearly describe the technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
Method described herein is to increase a witness mark TCH test channel, reference channel passes through coupling unit carrier signal, it is loaded in a nonlinear circuit, produce bigger inter-modulated signal, this inter-modulated signal and inter-modulated signal to be tested are produced by identical signal source, they are the coherent signals with frequency, can as the reference signal of inter-modulated signal phase test, the range value of tested inter-modulated signal is not only measured by dual pathways vector receiver, also measure the phase value of inter-modulated signal relative reference signal, so can obtain the Vector Message of inter-modulated signal.
As in figure 2 it is shown, the test system of the present invention includes:
Combiner, closes road signal in order to output after inter-modulated signal to be tested is closed road;
Duplexer filter, in order to will close, through described, the inter-modulated signal that road signal output produces to the measured piece described in measured piece or calibrating device reception or calibrating device;
Receiver, in order to receive the vector superposed signal of the inter-modulated signal that the inter-modulated signal produced in described duplexer filter produces with described measured piece or calibrating device;
Several bonders, in order to output after being coupled by signal to be tested;
Nonlinear circuit, produces internal reference inter-modulated signal in order to the signal to be tested after receiving described bonder coupling and sends to described receiver.
In the embodiment of fig. 2, this test system comprises an inter-modulated reference passage, the signal source of reference channel tests carrier signal from two, it can be separately coupling, namely need to arrange and the equal number of bonder of inter-modulated signal way to be tested, can also couple together behind Shi He road, it is possible to be coupling before device after filtering, it is also possible to couple after the filter.
On nonlinear circuit, produce inter-modulated signal as internal reference by the carrier signal coupled, determine the phase place of outside inter-modulated signal by measuring outside inter-modulated signal and the phase contrast of internal reference signal. This nonlinear circuit can be frequency mixer, diode or other the circuit that can produce bigger inter-modulated signal.
Before test measured piece, replace measured piece with the load of low intermodulation as calibrating device, first test system is done primary calibration test. The intermodulation value assuming load is zero, when connecting the load of low intermodulation, records inside self the intermodulation range value of test system and the phase value of relative reference signal record, and record result is as calibration value. By the intermodulation value recorded and the calibration value vector subtraction of record during test measured piece, just obtain the actual intermodulation value of measured piece. Owing to the intermodulation of duplexer self can be identified and remove in test process, in the test system improved, the intermodulation characteristic of duplexer is only small on final test result impact.
Before test, use low intermodulation load to carry out system calibration, during test, measurement result and calibration value vector subtraction are obtained the intermodulation value of measured piece.
Namely the present invention realizes the intermodulation testing method that in intermodulation testing, remaining intermodulation reduces comprise the following steps:
(1) receiver described in receives the internal reference inter-modulated signal of described nonlinear circuit output and measures amplitude and the phase value of this signal;
(2) disconnect the communication between described measured piece and described duplexer filter and set up the communication between described calibrating device and described duplexer filter;
(3) inter-modulated signal to be tested inputted described combiner and record the calibration signal that present receiving machine receives from described duplexer filter;
(4) disconnect the communication between described calibrating device and described duplexer filter and set up the communication between described measured piece and described duplexer filter;
(5) inter-modulated signal to be tested inputted described combiner and record the inter-modulated signal to be calibrated that present receiving machine receives from described duplexer filter;
(6) the inter-modulated signal value of measured piece is calculated according to described internal reference inter-modulated signal, calibration signal and signal to be calibrated.
Have employed the cross modulation test system realizing remaining intermodulation reduction in intermodulation testing in this invention and method, it is capable of reducing remaining intermodulation, low intermodulation load be easier realize, the remaining intermodulation making whole test system reaches less level, the impact on test result of the intermodulation characteristic of reduction duplexer filter, even if the intermodulation value of duplexer filter can also the intermodulation value of proper testing measured piece than the high 15～20dB of load, both may be used for the test of reflection intermodulation and can be used for the test of transmission intermodulation, go for the intermodulation testing of different rank, there is wider application scope.
In this description, the present invention is described with reference to its specific embodiment. But it is clear that still may be made that various amendment and conversion are without departing from the spirit and scope of the present invention. Therefore, specification and drawings is regarded in an illustrative, rather than a restrictive.
Claims (2)
1. one kind realizes the intermodulation testing method that in intermodulation testing, remaining intermodulation reduces, it is achieved the cross modulation test system that in intermodulation testing, remaining intermodulation reduces includes:
Combiner, closes road signal in order to output after inter-modulated signal to be tested is closed road;
Duplexer filter, in order to by closing the inter-modulated signal that described conjunction road signal output is produced by road signal output part to the measured piece described in measured piece or calibrating device reception or calibrating device;
Receiver, in order to receive the vector superposed signal of the inter-modulated signal that the inter-modulated signal produced in described duplexer filter produces with described measured piece or calibrating device;
It is characterized in that, described system also includes:
Several bonders, in order to output after being coupled by signal to be tested;
Nonlinear circuit, produces internal reference inter-modulated signal in order to the signal to be tested after receiving described bonder coupling and sends to described receiver;
It is characterized in that, described method comprises the following steps:
(1) receiver described in receives the internal reference inter-modulated signal of described nonlinear circuit output and measures amplitude and the phase value of this signal;
(2) disconnect the communication between described measured piece and described duplexer filter and set up the communication between described calibrating device and described duplexer filter;
(3) inter-modulated signal to be tested inputted described combiner and record the calibration signal that present receiving machine receives from described duplexer filter;
(4) disconnect the communication between described calibrating device and described duplexer filter and set up the communication between described measured piece and described duplexer filter;
(5) inter-modulated signal to be tested inputted described combiner and record the inter-modulated signal to be calibrated that present receiving machine receives from described duplexer filter;
(6) the inter-modulated signal value of measured piece is calculated according to described internal reference inter-modulated signal, calibration signal and signal to be calibrated.
2. according to claim 1 realize in intermodulation testing the intermodulation testing method that remaining intermodulation reduces, it is characterized in that, the described inter-modulated signal value calculating measured piece according to described internal reference inter-modulated signal, calibration signal and signal to be calibrated, comprises the following steps:
(61) phase value of outside actual measurement inter-modulated signal is determined according to the phase place of described internal reference inter-modulated signal and signal to be calibrated;
(62) signal to be calibrated is deducted calibration signal and obtains the inter-modulated signal value of measured piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410008797.XA CN103701547B (en) | 2014-01-08 | 2014-01-08 | Realize cross modulation test system and method that in intermodulation testing, remaining intermodulation reduces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410008797.XA CN103701547B (en) | 2014-01-08 | 2014-01-08 | Realize cross modulation test system and method that in intermodulation testing, remaining intermodulation reduces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103701547A CN103701547A (en) | 2014-04-02 |
| CN103701547B true CN103701547B (en) | 2016-06-15 |
Family
ID=50362959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410008797.XA Active CN103701547B (en) | 2014-01-08 | 2014-01-08 | Realize cross modulation test system and method that in intermodulation testing, remaining intermodulation reduces |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103701547B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247875B (en) * | 2019-05-27 | 2021-06-18 | 天津大学 | Intermodulation amplitude modulation and phase modulation generation method and circuit based on coherent nonlinear synthesis |
| CN110568283A (en) * | 2019-08-12 | 2019-12-13 | 中电科仪器仪表有限公司 | Active device intermodulation test device and test method |
| CN111064496A (en) * | 2019-12-31 | 2020-04-24 | 苏州信而泰信息技术有限公司 | Passive intermodulation test system |
| CN113612553B (en) * | 2021-08-04 | 2022-04-29 | 山东大学 | Receiver radio frequency link nonlinear effect multi-parameter test platform |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996802A (en) * | 2006-12-04 | 2007-07-11 | 信息产业部电信研究院 | RF consistency testing system of the time division synchronization and code division multi-address access terminal |
| CN103346851A (en) * | 2013-07-19 | 2013-10-09 | 武汉虹信通信技术有限责任公司 | Multi-system high-integration multi-level intermodulation test system |
-
2014
- 2014-01-08 CN CN201410008797.XA patent/CN103701547B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996802A (en) * | 2006-12-04 | 2007-07-11 | 信息产业部电信研究院 | RF consistency testing system of the time division synchronization and code division multi-address access terminal |
| CN103346851A (en) * | 2013-07-19 | 2013-10-09 | 武汉虹信通信技术有限责任公司 | Multi-system high-integration multi-level intermodulation test system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103701547A (en) | 2014-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9176180B1 (en) | Method for determining the distance to and magnitude of one or more passive intermodulation (PIM) source | |
| CN102780535B (en) | A kind of vector network analyzer Poewr control method based on intermediate frequency detection | |
| CN103701547B (en) | Realize cross modulation test system and method that in intermodulation testing, remaining intermodulation reduces | |
| CN104375011B (en) | A kind of any resistance test circuit for vector network analyzer testing of materials and method | |
| US20040222800A1 (en) | Enhanced isolation level between sampling channels in a vector network analyzer | |
| CN102324990B (en) | Vector reflection coefficient detection circuit only using amplitude detector and detection method thereof | |
| CN102778663B (en) | Phase noise calibrating device based on photoelectric fusion technique | |
| CN107110955B (en) | Method for calibrating a radar system | |
| CN1852062B (en) | Apparatus and method for detecting antenna feedback fault point of narrow-band base-station system | |
| CN104101807B (en) | Self intermodulation inhibition method for transmission passive intermodulation (PIM) test | |
| US20090174415A1 (en) | Method for Calibrating a Real-Time Load-Pull System | |
| CN104459395A (en) | Calibration frequency mixer scaling method based on time-frequency double domains | |
| US5170126A (en) | Microwave six-port noise parameter analyzer | |
| CN104880621A (en) | Self calibration passive intermodulation tester | |
| US10041986B2 (en) | Balanced bridge | |
| CN113300787A (en) | Method and test system for testing a device under test | |
| US20180269994A1 (en) | Dynamic passive intermodulation reference signal generator | |
| CN106911408A (en) | A kind of calibration method for calibrating repeater-transmitter group delay | |
| CN104062510B (en) | The two-port reciprocity feeder line insert loss method farther out of measurement error can be reduced | |
| CN103245851A (en) | Intermodulation tester for open-circuit device | |
| CN103297154A (en) | Method and device for detecting standing-wave ratio | |
| US10145931B2 (en) | Tester | |
| CN103346851B (en) | Multi-system high-integration multi-level intermodulation test system | |
| JP2023547606A (en) | System and method for compensating for power loss due to radio frequency (RF) signal probe mismatch in conducted signal testing | |
| CN210168033U (en) | Phase gain full-temperature automatic testing device of dual-channel frequency conversion system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Block C, No. 7, Lane 205, Gaoji Road, Songjiang District, Shanghai, 201601 Patentee after: Chuangyuan Xinke (Shanghai) Technology Co.,Ltd. Address before: 4th Floor, Building 28, No. 69, Guiqing Road, Xuhui District, Shanghai, 200233 Patentee before: TRANSCOM INSTRUMENTS Co.,Ltd. |
|
| CP03 | Change of name, title or address |