CN101598751B - Measuring method and measuring device of dynamic impedance of high-power radio-frequency module - Google Patents
Measuring method and measuring device of dynamic impedance of high-power radio-frequency module Download PDFInfo
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- CN101598751B CN101598751B CN200810067630A CN200810067630A CN101598751B CN 101598751 B CN101598751 B CN 101598751B CN 200810067630 A CN200810067630 A CN 200810067630A CN 200810067630 A CN200810067630 A CN 200810067630A CN 101598751 B CN101598751 B CN 101598751B
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- network analyzer
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Abstract
The invention relates to a measuring method of the dynamic impedance of a high-power radio-frequency module, comprising the following steps: sequentially connecting an attenuating device, a band-pass filter and a network analyzer in series; setting the network analyzer into a working mode with minimum IFBW and maximum output power; calibrating a network analyzer; connecting a device to be measured and an attenuator in series and enabling the device to be measured to work in a frequency point near a frequency point to be tested; and arranging the network analyzer in the test frequency point for measuring the dynamic impedance of the device to be measured in the test frequency point and reading a result. The measuring device comprises the attenuating device, the band-pass filter and the network analyzer which are sequentially connected in series. The invention can measure the dynamic impedance of a radio-frequency power output device.
Description
Technical field
The present invention relates to a kind of motional impedance measuring method of high-power radio-frequency module, promptly under the situation of radio-frequency module operate as normal, carry out the measuring method and the measurement mechanism thereof of motional impedance through indirect mode.
Background technology
The method of present existing measurement motional impedance is called impedance scan (Z-SCAN); It is through measuring the voltage and current vector of input Devices to test; Calculate the motional impedance of Devices to test then; This method can only be measured the motional impedance of the equipment that does not have power output, then can't measure such as equipment such as power amplifier, radio-frequency power supplies for the equipment that power output is arranged.
Summary of the invention
The objective of the invention is to overcome the problems referred to above, a kind of method that can measure the motional impedance of radio-frequency power output device is provided to society.
Another object of the present invention is: also to society the measurement mechanism that can realize said method is provided.
Ultimate principle of the present invention is: if measure the motional impedance of Devices to test at the C frequency, Devices to test is operated near the frequency the C frequency, measures its motional impedance at the C frequency through network analyzer.
The working frequency range of supposing Devices to test from A Hz to B Hz; If measure Devices to test at the frequency C Hz (motional impedance of A≤C≤B) locate; Can choose near the frequency XHz frequency C Hz (A≤X≤B); Make Devices to test be operated in frequency X Hz, the test frequency of network analyzer be set in C Hz, measure Devices to test at the motional impedance at frequency C Hz place and read the result.The calibration of network analyzer will be broken off the cable at Devices to test port A place earlier and calibrated in the port of cable, and network analyzer will be arranged to the test pattern of minimum IFBW (intermediate-frequency bandwidth) and peak power output.
The peak power output of supposing network analyzer is P
0DBm, BPF. decays to Ap dB frequency C Hz place, frequency X Hz place decay to As dB, attenuator all is A dB in the decay of whole working frequency range, Devices to test output power through port A in the process of test is P
ADBm.
At first the power that sends of network analyzer is P
0The power that the signal of dBm arrives the Devices to test port after through the decay of BPF. and attenuator is P
0-Ap-A dBm; For the frequency at Devices to test port A is that C Hz and frequency are the signal of X Hz; Decaying respectively through attenuator and BPF., A+Ap and A+As dB are laggard to go into the network analyser; So at the input port of network analyzer, frequency is that the signal intensity ratio frequency of C Hz is the big P of signal of X Hz
0-P
A+ As-2Ap-A dB.Choose the working frequency points X Hz of suitable BPF., attenuator and Devices to test, can make P
0-P
AThe value of+As-2Ap-A is greater than certain value (being generally 10 to 20dB); Make at the network analyzer input end, undesired signal is very little with respect to normal signal, adds the IF wave filter that network analyzer is inner; Well filtering interference signals draws correct measurement result.
Specifically, measuring process of the present invention is:
(1), attenuating device, BPF. and network analyzer are connected successively;
(2), network analyzer is arranged to the mode of operation of minimum IFBW and peak power output;
(3), network analyzer is calibrated;
(4), Devices to test is connected with attenuator, and with Devices to test be operated near the frequency the desire test frequency;
(5), network analyzer is set in the test frequency, measure the dynamic resistance state of Devices to test when the test frequency, and read the result.
Measurement mechanism one of the present invention is: comprise attenuator, BPF. and network analyzer, said attenuator, BPF. and network analyzer are connected successively.
Measurement mechanism two of the present invention is: comprise directional coupler, resistance, load, BPF. and network analyzer, said directional coupler is connected with BPF. and network analyzer through its port C successively; The port D connecting resistance of said directional coupler, the port E of directional coupler connects load.
The present invention has the advantage of the motional impedance that can measure the radio-frequency power output device.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of measurement mechanism one of the present invention.
Fig. 2 is the synoptic diagram that utilizes device to test result shown in Figure 1.
Fig. 3 is the structural representation of a kind of embodiment of measurement mechanism two of the present invention.
Embodiment
For making the auditor more be expressly understood principle of the present invention and structure composition, cooperate graphic explanation following now:
See also Fig. 1, Fig. 1 is the structural representation of a kind of embodiment of measurement mechanism one of the present invention.This device comprises attenuator, BPF. and network analyzer, and said attenuator, BPF. and network analyzer are connected successively.
One Devices to test (radio-frequency power supply) frequency of operation is arranged at 54MHz to 66MHz, will measure at the 60.3MHz place motional impedance when output power is 40dBm at present.Make Devices to test be operated in 54MHz; Choose the attenuator that decays to 20dB; BPF. is at the 30dB that decays at 54MHz place, and the decay at the 60.3MHz place is approximately 0dB, takes two wave filter series connection in order to reach better filter effect; The series connection postfilter is at the 60dB that decays at 54MHz place, the 0dB that decays at the 60.3MHz place.Network analyzer is arranged on peak power output 10dBm and minimum IFBW (intermediate-frequency bandwidth) mode of operation; Like this at the little 10dB of input port jam-to-signal normal signal of network analyzer; Can obtain good test result, test result is by shown in the Smith chart 2.Its measured value 1 is 59.386 Ω-j43.865 Ω.
Above-mentioned measurement mechanism can adopt following method to test:
(1), attenuator, BPF. and network analyzer are connected successively;
(2), network analyzer is arranged to the mode of operation of minimum IFBW and peak power output;
(3), network analyzer is calibrated;
(4), Devices to test is connected with attenuator, and with Devices to test be operated near the frequency the desire test frequency;
(5), network analyzer is set in the test frequency, measure the dynamic resistance state of Devices to test when the test frequency, and read the result.
See also Fig. 3, Fig. 3 is the structural representation of a kind of embodiment of measurement mechanism two of the present invention.This device comprises directional coupler, resistance, load, BPF. and network analyzer, and said directional coupler is connected with BPF. and network analyzer through its port C successively; The port D connecting resistance of said directional coupler, the port E of directional coupler connects load.Suppose that directional coupler port B is AdB to the coupling coefficient of port C, then can apply mechanically top expression formula and measure.If selecting coupling coefficient is the directional coupler of 20dB and 50 ohm load, use same BPF. in the above-mentioned example, then can obtain consistent test result.
Above-mentioned measurement mechanism can adopt following method to test:
(1), directional coupler is connected with BPF. and network analyzer through its port C successively; The port D connecting resistance of said directional coupler, the port E of directional coupler connects load;
(2), network analyzer is arranged to the mode of operation of minimum IFBW and peak power output;
(3), network analyzer is calibrated;
(4), Devices to test is connected with attenuator, and with Devices to test be operated near the frequency the desire test frequency;
(5), network analyzer is set in the test frequency, measure the dynamic resistance state of Devices to test when the test frequency, and read the result.
Claims (4)
1. a kind of measuring method of high-power radio-frequency module motional impedance is characterized in that, comprises the steps:
(1), attenuating device, BPF. and network analyzer are connected successively;
(2), network analyzer is arranged to the mode of operation of minimum IFBW and peak power output;
(3), network analyzer is calibrated;
(4), Devices to test is connected with attenuating device, and with Devices to test be operated near the frequency the desire test frequency;
(5), network analyzer is set in the test frequency, measure the motional impedance of Devices to test when the test frequency, and read the result.
2. measuring method according to claim 1 is characterized in that: said attenuating device comprises attenuator or directional coupler.
3. measurement mechanism of realizing the said method of claim 1, it is characterized in that: comprise attenuator, BPF. and network analyzer, said attenuator, BPF. and network analyzer are connected successively.
4. measurement mechanism of realizing the said method of claim 1; It is characterized in that: comprise directional coupler, resistance, load, BPF. and network analyzer, said directional coupler is connected with BPF. and network analyzer through its port C successively; The port D connecting resistance of said directional coupler, the port E of directional coupler connects load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810067630A CN101598751B (en) | 2008-06-03 | 2008-06-03 | Measuring method and measuring device of dynamic impedance of high-power radio-frequency module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810067630A CN101598751B (en) | 2008-06-03 | 2008-06-03 | Measuring method and measuring device of dynamic impedance of high-power radio-frequency module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101598751A CN101598751A (en) | 2009-12-09 |
| CN101598751B true CN101598751B (en) | 2012-09-05 |
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| CN200810067630A Expired - Fee Related CN101598751B (en) | 2008-06-03 | 2008-06-03 | Measuring method and measuring device of dynamic impedance of high-power radio-frequency module |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091556B (en) * | 2011-10-31 | 2016-03-30 | 国民技术股份有限公司 | A kind of measuring method of electronic tag matched impedance and system |
| CN102497236B (en) * | 2011-11-16 | 2014-10-22 | 中国电子科技集团公司第四十一研究所 | Method for utilizing network analyzer to localize and track dynamic signal and method thereof |
| CN103780314A (en) * | 2012-10-18 | 2014-05-07 | 富葵精密组件(深圳)有限公司 | Radio frequency characteristic test device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5345182A (en) * | 1991-10-31 | 1994-09-06 | Hewlett-Packard Company | Impedance meter capable of performing measurements at high precision over wide impedance and frequency ranges |
| JP2007163304A (en) * | 2005-12-14 | 2007-06-28 | Hitachi Kokusai Electric Inc | Internal impedance measuring method of active circuit |
| CN101093235A (en) * | 2007-07-20 | 2007-12-26 | 南京师范大学 | System for measuring internal impedance of noise source of switching power supply EMI based on Hilbert transform and current probe, and measuration method |
-
2008
- 2008-06-03 CN CN200810067630A patent/CN101598751B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5345182A (en) * | 1991-10-31 | 1994-09-06 | Hewlett-Packard Company | Impedance meter capable of performing measurements at high precision over wide impedance and frequency ranges |
| JP2007163304A (en) * | 2005-12-14 | 2007-06-28 | Hitachi Kokusai Electric Inc | Internal impedance measuring method of active circuit |
| CN101093235A (en) * | 2007-07-20 | 2007-12-26 | 南京师范大学 | System for measuring internal impedance of noise source of switching power supply EMI based on Hilbert transform and current probe, and measuration method |
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| CN101598751A (en) | 2009-12-09 |
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