CN103105576A - Device and method used for testing radio frequency amplifier gain - Google Patents
Device and method used for testing radio frequency amplifier gain Download PDFInfo
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- CN103105576A CN103105576A CN2011103560694A CN201110356069A CN103105576A CN 103105576 A CN103105576 A CN 103105576A CN 2011103560694 A CN2011103560694 A CN 2011103560694A CN 201110356069 A CN201110356069 A CN 201110356069A CN 103105576 A CN103105576 A CN 103105576A
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Abstract
The invention discloses a device and a method used for testing radio frequency amplifier gain. The device for testing the radio frequency amplifier gain comprises a power divider, a first logarithm detector and a second logarithm detector, wherein the power divider is provided with two output ends, one output end is connected with the first logarithm detector, and the other output end is connected with the second logarithm detector through an under-tested amplifier. The device and the method used for testing the radio frequency amplifier gain test power by replacing power meters by the logarithm detectors, so that the cost of the under-tested system is shapely reduced. The device used for testing the radio frequency amplifier gain has the advantage of being simple in structure, low in cost, high in accuracy, wide in testing range, and capable of testing the gain of the amplifier in a range of wide band and power.
Description
Technical field
The present invention relates to the gain test technical field, relate in particular to a kind of device and method of testing radio frequency amplifier gain.
Background technology
The gain test technology is very important technology in the radio frequency amplifier field tests, measured power and the main use of gain is power splitter and power meter at present, and the power meter fancy price makes whole cost of testing system high, moreover the power meter function that the test gain is used very little, reduced the service efficiency of power meter.
Mainly use signal source, isolator, frequency meter, variable attenuator, directional coupler, power meter, power supply and frequency spectrograph etc. for the test of gain in prior art, concrete test philosophy as shown in Figure 1, Fig. 1 is the schematic diagram of gain test system in prior art.In circuit shown in Figure 1, the power input Pi of tested amplifier and output power Po are calculated by following formula:
Pi＝P1+L1 (1)
Po＝P2+L2 (2)
In formula, P1 and P2 are respectively the reading of power meter 1 and power meter 2; L1=La-Lb, La and Lb are respectively in Fig. 1 from the E point to the A point and the loss of ordering to B from the E point; L2 is the circuit loss of ordering to D from the C point in Fig. 1.The unit of P1, P2, Pi, Po is dBm, and L1, L2 unit are dB.Drawing power gain Gp (dB) by formula (1) and (2) is:
Gp＝Po-Pi (3)
Linear gain Gl is the power gain that records in the output power variable quantity zone identical with the power input variable quantity.
In circuit shown in Figure 1, the effect of isolator is to make the power of tested amplifier keep constant, is not subjected to the impact of input impedance mismatch.When utilizing circuit shown in Figure 1, should record in advance circuit loss L1 and L2, should eliminate at test period the oscillatory occurences that frequency spectrograph monitors, load should be able to be born the power of feed-in, and the harmonic wave of signal source and clutter response should be down to and can be ignored.Concrete testing procedure is as follows: a) frequency of signal source is transferred to setting; B) add the bias condition of regulation; C) apply suitable power input for tested amplifier; D) change power input, make the variable quantity of output power identical with the power input variable quantity; E) gain that records in the output power variable quantity zone identical with the power input variable quantity is linear gain Gl.
Therefore, the method for testing to gain in prior art is more traditional, but structure is relatively complicated, and the system equipment cost is expensive, if extensive buying test will improve testing cost greatly.
Summary of the invention
The technical matters that (one) will solve
Be simplied system structure, reduction testing cost, the invention provides a kind of device and method of testing radio frequency amplifier gain.
(2) technical scheme
For achieving the above object, the invention provides a kind of device that radio-frequency amplifier gain is tested, this device comprises power splitter, the first logarithmic detector and the second logarithmic detector, wherein power splitter has two output terminals, an output terminal is connected in the first logarithmic detector, and another output terminal is connected in the second logarithmic detector by amplifier to be measured.
In such scheme, described power splitter is divided into two paths of signals with the radio-frequency power that receives, and wherein one the tunnel enters amplifier to be measured, and another road enters the first logarithmic detector; Divide the radio-frequency power that poor, power splitter receives and the radio-frequency power that enters the first logarithmic detector according to the merit of described power splitter, calculate the radio-frequency power that enters amplifier to be measured, this radio-frequency power that enters amplifier to be measured is the power input of amplifier to be measured; Obtain from the radio-frequency power of amplifier output to be measured according to the radio-frequency power that enters the second logarithmic detector, should be from the radio-frequency power of amplifier output to be measured the output power of amplifier to be measured.The power gain of described amplifier to be measured is the difference of amplifier output power to be measured and amplifier power input to be measured.
In such scheme, described the first logarithmic detector and described the second logarithmic detector are used for the power that detects is converted into voltage.
In such scheme, this device further is connected an attenuator between amplifier to be measured and the second logarithmic detector, for the high-power miniwatt that decays into, enter the power of the second logarithmic detector with reduction.
For achieving the above object, the present invention also provides a kind of method that radio-frequency amplifier gain is tested, and comprising:
Step 1: power splitter is divided into two paths of signals with the radio-frequency power that receives, and wherein one the tunnel enters amplifier to be measured, and another road enters the first logarithmic detector;
Step 2: divide the radio-frequency power that poor, power splitter receives and the radio-frequency power that enters the first logarithmic detector according to the merit of power splitter, calculate the radio-frequency power that enters amplifier to be measured, this radio-frequency power that enters amplifier to be measured is the power input of amplifier to be measured;
Step 3: obtain from the radio-frequency power of amplifier output to be measured according to the radio-frequency power that enters the second logarithmic detector, should be from the radio-frequency power of amplifier output to be measured the output power of amplifier to be measured;
Step 4: calculate the difference of amplifier output power to be measured and amplifier power input to be measured, obtain the power gain of amplifier to be measured.
In such scheme, further is connected an attenuator between amplifier to be measured and the second logarithmic detector, for the high-power miniwatt that decays into, enters the power of the second logarithmic detector with reduction.
(3) beneficial effect
The device and method of this testing radio frequency amplifier gain provided by the invention, replace power meter to come measured power with the high precision logarithmic detector, the cost of decrease test macro, this proving installation is simple in structure, cost is low, and precision is high, and test specification is wide, can be in very wide frequency band, the gain of power bracket build-in test amplifier.Along with the development of microelectric technique, this scheme will have larger potentiality.
Description of drawings
For further illustrating content of the present invention and characteristics, below in conjunction with drawings and Examples, the inventive method is done a detailed description, wherein:
Fig. 1 is the structural representation of the system that in prior art, radio-frequency amplifier gain tested;
Fig. 2 is the structural representation of the device that radio-frequency amplifier gain is tested provided by the invention;
Fig. 3 is the structural representation of device in high-power situation that radio-frequency amplifier gain is tested provided by the invention;
Fig. 4 is the corresponding curve according to embodiment of the present invention logarithmic detector output voltage and power input in the device that radio-frequency amplifier gain is tested;
Fig. 5 is input-output curve when according to the embodiment of the present invention, radio-frequency amplifier gain being tested.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
The present invention replaces power meter to come the radio-frequency power of testing radio frequency amplifier with high-precision logarithmic detector, and as shown in Figure 2, Fig. 2 is the structural representation of the device that radio-frequency amplifier gain is tested provided by the invention.
The device that radio-frequency amplifier gain is tested provided by the invention comprises power splitter, the first logarithmic detector and the second logarithmic detector, wherein power splitter is divided into two paths of signals with the radio-frequency power that receives, and the difference power of this two paths of signals can record (the merit minute difference that is power splitter) in advance; Wherein one the tunnel enter amplifier to be measured, another road enters the power that the first logarithmic detector records this road signal, then can calculate according to merit minute difference the power that enters amplifier to be measured, namely obtains the power input of amplifier to be measured; Enter the second logarithmic detector from the power of amplifier to be measured output and record output power, namely obtain the output power of amplifier to be measured.The power gain of amplifier to be measured is the poor of amplifier output power to be measured and amplifier power input to be measured.
The logarithm power that the first logarithmic detector or the second logarithmic detector detect and output dc voltage are stable linear relationship, thereby can obtain inputting the logarithm performance number from output dc voltage.
When the power input of logarithmic detector surpasses its inelastic region too greatly, in order to guarantee the safety of logarithmic detector, the present invention further is connected the attenuator of a fixed attenuation coefficient between the output terminal of amplifier to be measured and the second logarithmic detector, specifically as shown in Figure 3, enter the power of the second logarithmic detector with reduction, thereby guarantee that the power input of inputting logarithmic detector is in linear zone.
Based on the above-mentioned device that radio-frequency amplifier gain is tested shown in Figure 2, the present invention also provides the method that radio-frequency amplifier gain is tested, and the method comprises the following steps:
Step 1: power splitter is divided into two paths of signals with the radio-frequency power that receives, and wherein one the tunnel enters amplifier to be measured, and another road enters the first logarithmic detector;
Step 2: divide the radio-frequency power that poor, power splitter receives and the radio-frequency power that enters the first logarithmic detector according to the merit of power splitter, calculate the radio-frequency power that enters amplifier to be measured, namely obtain the power input of amplifier to be measured;
Step 3: obtain namely obtaining the output power of amplifier to be measured from the radio-frequency power of amplifier output to be measured according to the radio-frequency power that enters the second logarithmic detector;
Step 4: calculate the difference of amplifier output power to be measured and amplifier power input to be measured, obtain the power gain of amplifier to be measured.
Based on the above-mentioned device that radio-frequency amplifier gain is tested shown in Figure 3, the invention provides the method that radio-frequency amplifier gain is tested, the method comprises the following steps:
Step 1: the low-power level signal that incoming frequency is fixing;
Step 2: from the first logarithmic detector read-out voltage that is connected with power splitter, according to the translation table of determining, calculate the power input of amplifier to be measured;
Step 3: from the second logarithmic detector read-out voltage that is connected with amplifier out to be measured, according to the translation table of determining, calculate the output power of amplifier to be measured;
Step 4: progressively add high-power, test each the group input-output power, until enter the inelastic region;
Step 5: add a fixed attenuator at input end when power input enters the inelastic region of logarithmic detector.
Fig. 4 shows the corresponding curve according to embodiment of the present invention logarithmic detector output voltage and power input in the device that radio-frequency amplifier gain is tested; Fig. 5 shows input-output curve when according to the embodiment of the present invention, radio-frequency amplifier gain being tested.
The device that radio-frequency amplifier gain is tested provided by the invention, simple in structure as can be seen from the above technical solutions, and due to the logarithmic detector low price, cause testing cost also very cheap.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. device that radio-frequency amplifier gain is tested, it is characterized in that, this device comprises power splitter, the first logarithmic detector and the second logarithmic detector, wherein power splitter has two output terminals, an output terminal is connected in the first logarithmic detector, and another output terminal is connected in the second logarithmic detector by amplifier to be measured.
2. the device that radio-frequency amplifier gain is tested according to claim 1, is characterized in that, described power splitter is divided into two paths of signals with the radio-frequency power that receives, and wherein one the tunnel enters amplifier to be measured, and another road enters the first logarithmic detector;
Divide the radio-frequency power that poor, power splitter receives and the radio-frequency power that enters the first logarithmic detector according to the merit of described power splitter, calculate the radio-frequency power that enters amplifier to be measured, this radio-frequency power that enters amplifier to be measured is the power input of amplifier to be measured;
Obtain from the radio-frequency power of amplifier output to be measured according to the radio-frequency power that enters the second logarithmic detector, should be from the radio-frequency power of amplifier output to be measured the output power of amplifier to be measured.
3. the device that radio-frequency amplifier gain is tested according to claim 2, is characterized in that, the power gain of described amplifier to be measured is the difference of amplifier output power to be measured and amplifier power input to be measured.
4. the device that radio-frequency amplifier gain is tested according to claim 1, is characterized in that, described the first logarithmic detector and described the second logarithmic detector are used for the power that detects is converted into voltage.
5. the device that radio-frequency amplifier gain is tested according to claim 1, it is characterized in that, this device further is connected an attenuator between amplifier to be measured and the second logarithmic detector, for the high-power miniwatt that decays into, enter the power of the second logarithmic detector with reduction.
6. the method that radio-frequency amplifier gain is tested, be applied to device claimed in claim 1, it is characterized in that, comprising:
Step 1: power splitter is divided into two paths of signals with the radio-frequency power that receives, and wherein one the tunnel enters amplifier to be measured, and another road enters the first logarithmic detector;
Step 2: divide the radio-frequency power that poor, power splitter receives and the radio-frequency power that enters the first logarithmic detector according to the merit of power splitter, calculate the radio-frequency power that enters amplifier to be measured, this radio-frequency power that enters amplifier to be measured is the power input of amplifier to be measured;
Step 3: obtain from the radio-frequency power of amplifier output to be measured according to the radio-frequency power that enters the second logarithmic detector, should be from the radio-frequency power of amplifier output to be measured the output power of amplifier to be measured;
Step 4: calculate the difference of amplifier output power to be measured and amplifier power input to be measured, obtain the power gain of amplifier to be measured.
7. the method that radio-frequency amplifier gain is tested according to claim 6, it is characterized in that, further is connected an attenuator between amplifier to be measured and the second logarithmic detector, for the high-power miniwatt that decays into, enters the power of the second logarithmic detector with reduction.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334399A (en) * | 2015-12-14 | 2016-02-17 | 天津光电通信技术有限公司 | Detection system and method of voltage-controlled attenuator |
| CN105606984A (en) * | 2015-12-18 | 2016-05-25 | 中国电子科技集团公司第四十一研究所 | Multi-parameter parallel test system and method of semiconductor wafer test |
| CN106199239A (en) * | 2016-06-24 | 2016-12-07 | 北京航空航天大学 | A kind of measuring method of radio frequency amplifier intermodulation suppression level based on X parameter |
| CN107748323A (en) * | 2017-12-05 | 2018-03-02 | 华北电力大学 | A kind of integrated transporting discharging exchanges Open loop gain cofficient test system |
| CN108574602A (en) * | 2018-04-24 | 2018-09-25 | 北京东方计量测试研究所 | A kind of ad hoc network topology simulation system |
| CN108802447A (en) * | 2018-06-15 | 2018-11-13 | 中电科仪器仪表有限公司 | A method of improving high power semi-conductor amplifier Security of test |
| CN113064049A (en) * | 2021-03-17 | 2021-07-02 | 深圳市时代速信科技有限公司 | Radio frequency power amplifier chip test system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257472A (en) * | 2008-04-09 | 2008-09-03 | 浙江大学 | Orthogonal frequency division multiplexing receiver system and its automatic gain control method |
| CN101505178A (en) * | 2009-03-17 | 2009-08-12 | 京信通信***（中国）有限公司 | Envelop detection apparatus and method thereof |
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2011
- 2011-11-11 CN CN2011103560694A patent/CN103105576A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257472A (en) * | 2008-04-09 | 2008-09-03 | 浙江大学 | Orthogonal frequency division multiplexing receiver system and its automatic gain control method |
| CN101505178A (en) * | 2009-03-17 | 2009-08-12 | 京信通信***（中国）有限公司 | Envelop detection apparatus and method thereof |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334399B (en) * | 2015-12-14 | 2017-12-08 | 天津光电通信技术有限公司 | The detecting system and detection method of a kind of voltage-controlled attenuator |
| CN105334399A (en) * | 2015-12-14 | 2016-02-17 | 天津光电通信技术有限公司 | Detection system and method of voltage-controlled attenuator |
| CN105606984B (en) * | 2015-12-18 | 2019-04-09 | 中国电子科技集团公司第四十一研究所 | A kind of the multi-parameter parallel test system and method for test semiconductor wafer |
| CN105606984A (en) * | 2015-12-18 | 2016-05-25 | 中国电子科技集团公司第四十一研究所 | Multi-parameter parallel test system and method of semiconductor wafer test |
| CN106199239A (en) * | 2016-06-24 | 2016-12-07 | 北京航空航天大学 | A kind of measuring method of radio frequency amplifier intermodulation suppression level based on X parameter |
| CN106199239B (en) * | 2016-06-24 | 2019-05-17 | 北京航空航天大学 | A kind of measurement method of the radio frequency amplifier intermodulation suppression level based on X parameter |
| CN107748323B (en) * | 2017-12-05 | 2019-09-27 | 华北电力大学 | A kind of integrated transporting discharging exchange Open loop gain cofficient test macro |
| CN107748323A (en) * | 2017-12-05 | 2018-03-02 | 华北电力大学 | A kind of integrated transporting discharging exchanges Open loop gain cofficient test system |
| CN108574602A (en) * | 2018-04-24 | 2018-09-25 | 北京东方计量测试研究所 | A kind of ad hoc network topology simulation system |
| CN108574602B (en) * | 2018-04-24 | 2021-04-20 | 北京东方计量测试研究所 | Ad hoc network topology simulation system |
| CN108802447A (en) * | 2018-06-15 | 2018-11-13 | 中电科仪器仪表有限公司 | A method of improving high power semi-conductor amplifier Security of test |
| CN108802447B (en) * | 2018-06-15 | 2021-04-13 | 中电科思仪科技股份有限公司 | Method for improving test safety of high-power semiconductor amplifier |
| CN113064049A (en) * | 2021-03-17 | 2021-07-02 | 深圳市时代速信科技有限公司 | Radio frequency power amplifier chip test system |
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Application publication date: 20130515 |