CN102798812A - Three-order cross-modulation signal testing system - Google Patents
Three-order cross-modulation signal testing system Download PDFInfo
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- CN102798812A CN102798812A CN2012102940366A CN201210294036A CN102798812A CN 102798812 A CN102798812 A CN 102798812A CN 2012102940366 A CN2012102940366 A CN 2012102940366A CN 201210294036 A CN201210294036 A CN 201210294036A CN 102798812 A CN102798812 A CN 102798812A
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Abstract
The invention provides a three-order cross-modulation signal testing system which can avoid influence of the cross-modulation signal of the testing system per se to the test efficiently and guarantee testing precision. The three-order cross-modulation signal testing system comprises two groups of signal generation systems, a power combiner and a frequency spectrum analyzer, wherein the front end of the power combiner is in parallel connection with the two groups of the signal generation systems while the back end thereof is connected with a to-be-tested filter; the back end of the to-be-tested filter is connected with a frequency spectrum analyzer; each signal generation system comprises a signal generator and is characterized by further comprising a loop device and a first low-inter-modulation fixed attenuator; the signal generator is connected with the first low-inter-modulation fixed attenuator through the loop device; and the first low-inter-modulation fixed attenuator is then connected with the power combiner.
Description
Technical field
The present invention relates to the third order intermodulation signal testing field of SAW filter, especially relate to the third order intermodulation signal testing field of passive sonic surface wave wave filter, be specially the third order intermodulation signal test system.
Background technology
The third order intermodulation distortion that is produced by two frequencies is a ubiquitous problem in the narrow-band communication system, when having the signal of two (or more) in the system, can produce very strong intermodulation product usually.The second harmonic (2f1 and 2f2) of two signals (f1 and f2) can further produce intermodulation distortion, and its maximum intermodulation product is exactly third order intermodulation (2f1-f2 and 2f2-f1).No matter be active or passive device; All can produce intermodulation product three times like amplifier, frequency mixer and wave filter etc.; These intermodulation products can reduce the performance of many communication systems; Excessive third order intermodulation (IMD) product can disturb other receiver in transmitting, and finally causes the receiver can't operate as normal.Along with further developing of the communication technology; Especially the development of the 4th third-generation mobile communication and back four third-generation mobile communications technology; For the SAW filter technical indicator more harsh requirement has been proposed, especially to the index test of third order intermodulation signal, but because the third order intermodulation semaphore of passive sonic surface wave filters to test is less; The intermodulation signal that existing third order intermodulation signal test system self produces can bring larger interference to test, thereby influences measuring accuracy.
Summary of the invention
To the problems referred to above, the invention provides the third order intermodulation signal test system, it can effectively avoid the influence of test macro self intermodulation signal to test, guarantees measuring accuracy.
Its technical scheme is such; It comprises two groups of signal generating systems, power combiner, spectrum analyzer; The parallel connection of the front end of said power combiner said two groups of signal generating systems, rear ends connect wave filter to be measured; The rear end of said wave filter to be measured connects said spectrum analyzer, and said signal generating system comprises signal generator, it is characterized in that: said signal generating system also comprises loop device and low intermodulation fixed attenuator one; Said signal generator is connected with said low intermodulation fixed attenuator one through said loop device, and said low intermodulation fixed attenuator is connected with said power combiner again and again.
It is further characterized in that:
The front end of said wave filter to be measured, rear end are connected with said power combiner, said spectrum analyzer through low intermodulation fixed attenuator two, low intermodulation fixed attenuator three respectively;
Said signal generator dynamic power range is-145dBm～30 dBm that the harmonic wave of signal generator suppresses degree: second harmonic＞50dB, third harmonic＞70 dB.
Adopt test macro of the present invention the passive sonic surface wave wave filter is carried out the third order intermodulation signal testing; Its beneficial effect is: the rear end of its signal generator is provided with the loop device of the reflected signal of input signal and back-end circuit that can the isolation signals source; Thereby effectively avoid the intermodulation signal of test macro itself that measuring accuracy is influenced, guaranteed measuring accuracy; Simultaneously; Connect low intermodulation fixed attenuator one in the rear end of loop device; Also be connected with low intermodulation fixed attenuator two and the low fixed attenuator three of establishing mutually respectively in the front and back end of wave filter to be measured, low intermodulation fixed attenuator can the effective attenuation signal power, makes signal reach the optimum measurement scope of spectrum analyzer; And avoid the interference of the self-excitation intermodulation signal of spectrum analyzer, further guarantee measuring accuracy; In addition, the signal source that it selects for use high frequency multiplication to suppress, low harmonic wave has further guaranteed measuring accuracy.
Description of drawings
Fig. 1 constitutes synoptic diagram for third order intermodulation signal test system of the present invention.
Embodiment
See Fig. 1; Third order intermodulation signal test system of the present invention comprises first signal generating system, secondary signal generation systems, power combiner, spectrum analyzer; First signal generating system comprises first signal generator, the first loop device and the first low intermodulation fixed attenuator one that is linked in sequence; The secondary signal generation systems comprises secondary signal generator, the second loop device and the second low intermodulation fixed attenuator one that is linked in sequence; The first low intermodulation fixed attenuator one and the second intermodulation fixed attenuator one are connected to the power combiner front end side by side, and the power combiner rear end is linked in sequence successively and hangs down intermodulation fixed attenuator two, wave filter to be measured, low intermodulation fixed attenuator three and spectrum analyzer.Among the present invention, signal generator provides stable signal source, need consider the dynamic power range of instrument and the harmonic wave of signal source during type selecting and suppress degree; The dynamic power range of its signal generator is-145dBm～30 dBm; The harmonic wave of signal generator suppresses degree: second harmonic＞50dB, and third harmonic＞70 dB is because its signal source of selecting for use high frequency multiplication to suppress; Low harmonic wave has further guaranteed measuring accuracy.
Claims (3)
1. third order intermodulation signal test system; It comprises two groups of signal generating systems, power combiner, spectrum analyzer; The parallel connection of the front end of said power combiner said two groups of signal generating systems, rear ends connect wave filter to be measured; The rear end of said wave filter to be measured connects said spectrum analyzer, and said signal generating system comprises signal generator, it is characterized in that: said signal generating system also comprises loop device and low intermodulation fixed attenuator one; Said signal generator is connected with said low intermodulation fixed attenuator one through said loop device, and said low intermodulation fixed attenuator is connected with said power combiner again and again.
2. third order intermodulation signal test system according to claim 1 is characterized in that: the front end of said wave filter to be measured, rear end are connected with said power combiner, said spectrum analyzer through low intermodulation fixed attenuator two, low intermodulation fixed attenuator three respectively.
3. third order intermodulation signal test system according to claim 1 and 2 is characterized in that: said signal generator dynamic power range is-145dBm～30 dBm that the harmonic wave of signal generator suppresses degree: second harmonic＞50dB, third harmonic＞70 dB.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102940366A CN102798812A (en) | 2012-08-17 | 2012-08-17 | Three-order cross-modulation signal testing system |
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| CN2012102940366A CN102798812A (en) | 2012-08-17 | 2012-08-17 | Three-order cross-modulation signal testing system |
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| CN102798812A true CN102798812A (en) | 2012-11-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132426A (en) * | 2017-05-02 | 2017-09-05 | 上海德科电子仪表有限公司 | A kind of car antenna measurement and analysis switching device |
| TWI739477B (en) * | 2020-06-16 | 2021-09-11 | 瑞昱半導體股份有限公司 | Signal adjustment device and signal adjustment method |
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| US20030078027A1 (en) * | 2001-10-18 | 2003-04-24 | L3 Communications Corporation | Even harmonic mixer with high-input, third-order intercept point |
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| US20080231369A1 (en) * | 2007-03-07 | 2008-09-25 | Fci Inc. | Variable-gain low-noise amplifier |
| CN202794447U (en) * | 2012-08-17 | 2013-03-13 | 爱普科斯科技（无锡）有限公司 | Third-order intermodulation signal testing system |
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- 2012-08-17 CN CN2012102940366A patent/CN102798812A/en active Pending
Patent Citations (5)
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| WO2003023953A1 (en) * | 2001-09-11 | 2003-03-20 | Sirenza Microdevices, Inc. | Toi and power compression bias network |
| US20030078027A1 (en) * | 2001-10-18 | 2003-04-24 | L3 Communications Corporation | Even harmonic mixer with high-input, third-order intercept point |
| CN1725026A (en) * | 2004-07-20 | 2006-01-25 | 华为技术有限公司 | Measuring and testing method for gain compression point output power of amplifier |
| US20080231369A1 (en) * | 2007-03-07 | 2008-09-25 | Fci Inc. | Variable-gain low-noise amplifier |
| CN202794447U (en) * | 2012-08-17 | 2013-03-13 | 爱普科斯科技（无锡）有限公司 | Third-order intermodulation signal testing system |
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| 赵利等: "高IP3的测试方法", 《现代电子技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132426A (en) * | 2017-05-02 | 2017-09-05 | 上海德科电子仪表有限公司 | A kind of car antenna measurement and analysis switching device |
| TWI739477B (en) * | 2020-06-16 | 2021-09-11 | 瑞昱半導體股份有限公司 | Signal adjustment device and signal adjustment method |
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Application publication date: 20121128 |