CN106018988A - Multistage frequency converter noise coefficient automatic scanning measuring method - Google Patents
Multistage frequency converter noise coefficient automatic scanning measuring method Download PDFInfo
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- CN106018988A CN106018988A CN201610352493.4A CN201610352493A CN106018988A CN 106018988 A CN106018988 A CN 106018988A CN 201610352493 A CN201610352493 A CN 201610352493A CN 106018988 A CN106018988 A CN 106018988A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
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Abstract
The invention discloses a multistage frequency converter noise coefficient automatic scanning measuring method, and belongs to the technical field of automatic testing. According to the invention, the radio frequency range of a multistage frequency converter is adjusted, and automatic control over a first local oscillator source output frequency of a tested member is realized; a consumption compensation function is utilized to compensate a noise source excess noise ratio calling error introduced by radio frequency adjustment, automatic and rapid scanning measurement of a multistage frequency converter noise coefficient is finally realized, the serious defects of manual and point frequency measuring methods in speed measurement are overcome, and the measuring efficiency of the multistage frequency converter noise coefficient is greatly improved.
Description
Technical field
The invention belongs to automatic test technology field, be specifically related to a kind of multistage frequency conversion device noise coefficient automatic scanning survey method.
Background technology
Frequency conversion device is the core component of radio frequency and microwave transmitting and receiving equipment, and radar, satellite and radio communications system are generally adopted
By the reception scheme of multistage frequency conversion, the noiseproof feature of multistage frequency conversion device has directly impact to the sensitivity of receiver system.Along with
The fast development of electronic technology, receiver system processes the ability of small-signal and gradually improves, to receiver noise factor
The demand of performance test is the most urgent.To multistage frequency conversion device noise coefficient accurately measure be possible not only to accelerate design verification speed,
Improve production efficiency and checking system running status, and directly decide developing and the success or failure of final application of system.
The key component of multistage frequency conversion device (with two-stage frequency conversion as example) is as shown in Figure 1.First order converter is generally adopted
With the mixing scheme of high intermediate frequency, the most only just can effectively suppress image response at input low pass filter.First order frequency conversion
Device and scanning first vibration source (LO1) broadband input radio frequency signal (RF) is transformed into fixed intermediate frequency (IF1)；IF1With fixing
Second local oscillator (LO2) mixing, export the second intermediate frequency (IF2).In Fig. 1, the wave filter before first order converter determines frequency conversion
The sideband that device noise coefficient is measured selects, and is chosen as lower sideband in example, and amplifier does not affect phase during noise-factor measurement
The setting of related parameter.
The method that the most general noise coefficient to multistage frequency conversion device measures is as follows:
First having to calibrate acoustic meter, calibration connects as in figure 2 it is shown, calibration steps is as follows:
Step 1: open acoustic meter, loads noise source excess noise ratio (ENR) value used, preheats acoustic meter；
Step 2: selection measurement pattern is that low-converter, LO be variable, lower sideband；
Step 3: in pattern is arranged, arranging IF-FRE is IF2；
Step 4: by twice aligning key, acoustic meter is calibrated.IF-FRE IF is only received due to acoustic meter2Signal, because of
This is only at IF2Frequency point is calibrated.
Then measured piece is connected, as it is shown on figure 3, measured piece is measured.
Pressing frequency/key of counting, arranging fixed frequency is initial rf frequency point, and manual calculations also arranges corresponding first vibration source frequency
Rate, obtains measured piece radio frequency initial frequency spot noise factor.Set gradually the rf frequency point of measured piece and corresponding local frequency
Point, obtains the noise coefficient of measured piece full frequency band.
The shortcoming of prior art:
In this example, the frequency range of first vibration source determines that, IF-FRE IF2It is the parameter that must input, during measurement
According to this IF2The receiver channel of frequency configuration acoustic meter；Acoustic meter is real according to the sideband arranged, radio frequency and IF-FRE relation
Now local frequency is automatically controlled.Frequency relation is as follows: LO-RF=IF (lower sideband)；RF-LO=IF (upper side band)；
RF=LO (double-side band).In this example, the first converter sideband is chosen as lower sideband, prior art acoustic meter only in
LO1=RF+IF2Relation control local frequency, and first actual operating frequency of shaking is LO1=RF+IF1, so noise
Instrument can not automatically control the actual output frequency of first vibration source, here it is prior art cannot realize multistage frequency conversion device noise system
The reason that number automatic frequency sweep is measured, therefore pointwise can only carry out the manually some frequency of rf frequency and first vibration frequency and arranges, measure
Speed is slow, efficiency is low, it is impossible to meet batch measurement demand produced well.
Summary of the invention
When measuring multistage frequency conversion device noise coefficient for prior art, acoustic meter cannot automatically control the output frequency of first vibration source
Rate, can only pointwise carry out the manually some frequency of rf frequency and first vibration source output frequency arrange, measuring speed slow, inefficient
Wretched insufficiency, the present invention proposes a kind of multistage frequency conversion device noise coefficient automatic scanning survey method, reasonable in design, overcomes
The deficiencies in the prior art, have good promotional value.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of multistage frequency conversion device noise coefficient automatic scanning survey method, uses noise coefficient test system, described noise system
Number test system includes acoustic meter and noise source；
Described multistage frequency conversion device noise coefficient automatic scanning survey method, is carried out in accordance with the following steps:
Step 1: acoustic meter is calibrated；
Step 2: access multistage frequency conversion device measured piece: the input of measured piece is connected to the outfan of noise source, measured piece
Outfan by connection to the rf inputs mouth of acoustic meter, the program control of local vibration source of the first order converter of measured piece connects
Mouth is connected to the programmable interface of acoustic meter by GPIB cable or netting twine；
Step 3: acoustic meter is set and controls to open to local oscillator, according to measured piece, the local oscillation power of the local vibration source of first order converter is wanted
Ask and local oscillation power is set；
Step 4: be adjusted by the rf frequency of measured piece, will RFActual=LO1-IF1It is adjusted to RFAdjust=LO1-IF2,
It is correspondingly arranged the initial frequency of acoustic meter according to the radio frequency range after adjusting and terminates frequency, arranging and include measure dot number peace
All at other interior relevant parameters；
Step 5: acoustic meter according to adjust after initial frequency and terminate frequency be scanned measure, and according to adjust after radio frequency,
Frequency relation formula LO of intermediate frequency and local oscillator1=RFAdjust+IF2Automatically control the output frequency of the local vibration source of first order converter, from
The initial frequency lock-and-follow scan of the local vibration source of one-level converter, to terminating frequency, keeps the radio frequency after adjusting and first order frequency conversion
The synchronous scanning of the local vibration source of device, obtains the sweep measurement result of noise coefficient, is designated as NFMeasure。
Preferably, in steps of 5, according to correction formula NFRevise=NFMeasure+ENRRF (actual)-ENRRF (adjusts)To sweep measurement result
NFMeasureAutomatically the method revised, specifically includes
Step 5.1: set up the loss balancing table before measured piece, specifically include
Step 5.1.1: press the loss balancing key of acoustic meter, configuration loss balancing type is: form before DUT；
Step 5.1.2: by the temperature Menu key of acoustic meter, Temperature numerical before input DUT；
Step 5.1.3: by the loss balancing table Menu key of acoustic meter, set up the loss balancing form before measured piece；
Step 5.2: the frequency arranging loss balancing table is the rf frequency after adjusting, and makes an uproar according to the super of noise source beacon frequency
Ratio inputs corresponding offset by compensation value calculation formula (1) successively；
Offset=ENRRF (adjusts)-ENRRF (actual)(1)；
Step 5.3: arrange the state of loss balancing table, is arranged loss balancing: DUT in acoustic meter calibration process as follows
The Configuration Type of loss balancing, for closing, is arranged: form before DUT during measuring by front state as follows；
Step 5.4: by RFAdjustIn the range of excess noise ratio value ENRRF (adjusts)It is modified to RFActualIn the range of corresponding excess noise ratio value
ENRRF (actual), the actual noise coefficient of measured piece after being revised.
The Advantageous Effects that the present invention is brought:
The present invention proposes a kind of multistage frequency conversion device noise coefficient automatic scanning survey method, compared with prior art, the present invention
By adjusting multistage frequency conversion device radio frequency range, it is achieved that measured piece first vibration source output frequency is automatically controlled；Logical
Crossing service wear and compensate function, the noise source excess noise ratio compensating rf frequency adjustment introducing calls error, finally achieves multistage
Automatic, quick, the sweep measurement of frequency conversion device noise coefficient, solve existing manually, point-frequency measurement is in terms of measuring speed
Wretched insufficiency, greatly improves multistage frequency conversion device noise coefficient and measures efficiency, and application is wide.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of existing multistage frequency conversion device.
Fig. 2 is the connection block diagram calibrating acoustic meter.
Fig. 3 is the connection block diagram that existing multistage frequency conversion device noise coefficient is measured.
Fig. 4 is noise coefficient of the present invention test system and the connection block diagram of measured piece.
Fig. 5 is the FB(flow block) of multistage frequency conversion device noise coefficient of the present invention automatic scanning survey method.
Fig. 6 be acoustic meter loss balancing function interface schematic diagram is set, thus it is shown that the setting of loss balancing function relevant parameter.
Fig. 7 is the editing interface schematic diagram of acoustic meter loss balancing table, thus it is shown that the editor of loss balancing table.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the present invention is described in further detail by detailed description of the invention:
This patent is according to LO1And IF2The rf frequency of measured piece is adjusted, is adjusted to RFAdjust=LO1-IF2.So make an uproar
Sound instrument just can control the output frequency of first vibration source, keeps radio frequency and the synchronous scanning of first vibration source, thus realizes noise
The automatic scanning survey of coefficient.
As shown in Figure 4, described noise coefficient test system includes acoustic meter to the connection block diagram of noise coefficient test system and measured piece
And noise source；
Concrete measuring method (as shown in Figure 5) is as follows:
Step 1: calibrate acoustic meter, calibration connects as in figure 2 it is shown, calibration steps is identical with prior art；
Step 2: access multistage frequency conversion device measured piece, connects as shown in Figure 4, the input of measured piece is connected to noise source
Outfan, the outfan of measured piece passes through the connection rf inputs mouth to acoustic meter, the first order converter of measured piece
The programmable interface of local vibration source is connected to the programmable interface of acoustic meter by GPIB cable or netting twine；
Step 3: press LO on acoustic meter and control Menu key, LO controlled state is set for opening, by external LO power Menu key, according to
Measured piece arranges local oscillation power to the requirement of the local oscillation power of first vibration source；
Step 4: be adjusted by the rf frequency of measured piece, will RFActual=LO1-IF1It is adjusted to RFAdjust=LO1-IF2,
It is correspondingly arranged the initial frequency of acoustic meter according to the radio frequency range after adjusting and terminates frequency, arranging and include measure dot number peace
All at other interior relevant parameters；
Step 5: acoustic meter according to adjust after initial frequency and terminate frequency be scanned measure, and according to adjust after radio frequency,
Frequency relation formula LO of intermediate frequency and local oscillator1=RFAdjust+IF2Automatically control the output frequency of the local vibration source of first order converter, from
The initial frequency lock-and-follow scan of the local vibration source of one-level converter, to terminating frequency, keeps the radio frequency after adjusting and first order frequency conversion
The synchronous scanning of the local vibration source of device, obtains the sweep measurement result of noise coefficient, is designated as NFMeasure。
In the present invention, during noise-factor measurement, acoustic meter calls RF automaticallyAdjustRear initial frequency is corresponding with terminating frequency
Excess noise ratio value, yet with noise source output is broadband white noise signal, in measured piece work process, each through measured piece
After level filter filtering, only RFActualIn the range of the noise power of noise source output could enter in measured piece passage mixed through two-stage
Frequently, intermediate frequency is exported after Filtering Processing, it is therefore desirable to the RF that will callAdjustIn the range of excess noise ratio value be modified to RFActualIn the range of right
The excess noise ratio value answered, after so can be obtained by revising, the actual noise coefficient of measured piece, is designated as NFRevise。
NFRevise=NFMeasure+ENRRF (actual)-ENRRF (adjusts) (1)
User can carry out manual correction by formula (1) to the noise coefficient automatic frequency sweep measurement result of multistage frequency conversion device.
This patent provides the loss balancing function using acoustic meter, compensates rf frequency adjustment introducing noise source excess noise ratio and calls difference
A kind of automatic correcting method of value, specifically comprises the following steps that
Step 1: set up the loss balancing table before measured piece
Step 1.1: press loss balancing key, configuration loss balancing type is: form before DUT.
Step 1.2: by temperature Menu key, Temperature numerical before input DUT, interface is set as shown in Figure 6.
Step 1.3: by loss balancing table Menu key, sets up the loss balancing form before measured piece, as shown in Figure 7.
Step 1.4: the frequency in loss balancing table is the rf frequency RF after adjustingAdjust, the value in loss balancing table is:
ENRRF (adjusts)-ENRRF (actual)(as shown in table 1).
Table 1 loss balancing table
| Frequency | Value |
| RFAdjust | ENRRF (adjusts)-ENRRF (actual) |
Step 2: arrange the state of loss balancing table, is arranged loss balancing: before DUT in acoustic meter calibration process as follows
State for closing, during measuring, the Configuration Type of loss balancing is arranged as follows: form before DUT.
The present invention is by adjusting multistage frequency conversion device radio frequency range, it is achieved that to measured piece first vibration source actual output frequency
Automatically control；Compensating function by service wear, the noise source excess noise ratio compensating rf frequency adjustment introducing calls error,
Achieve automatic, quick, the sweep measurement to multistage frequency conversion device noise coefficient eventually, greatly improve multistage frequency conversion device noise
Coefficient measures efficiency.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, the art
Change that technical staff is made in the essential scope of the present invention, retrofit, add or replace, also should belong to the protection of the present invention
Scope.
Claims (2)
1. a multistage frequency conversion device noise coefficient automatic scanning survey method, it is characterised in that: use noise coefficient test system,
Described noise coefficient test system includes acoustic meter and noise source；
Described multistage frequency conversion device noise coefficient automatic scanning survey method, is carried out in accordance with the following steps:
Step 1: acoustic meter is calibrated；
Step 2: access multistage frequency conversion device measured piece: the input of measured piece is connected to the outfan of noise source, measured piece
Outfan by connection to the rf inputs mouth of acoustic meter, the program control of local vibration source of the first order converter of measured piece connects
Mouth is connected to the programmable interface of acoustic meter by GPIB cable or netting twine；
Step 3: acoustic meter is set and local oscillator is controlled as opening, according to the measured piece local oscillation power to the local vibration source of first order converter
Requirement arranges local oscillation power；
Step 4: be adjusted by the rf frequency of measured piece, will RFActual=LO1-IF1It is adjusted to RFAdjust=LO1-IF2,
It is correspondingly arranged the initial frequency of acoustic meter according to the radio frequency range after adjusting and terminates frequency, arranging and include measure dot number peace
All at other interior relevant parameters；
Step 5: acoustic meter according to adjust after initial frequency and terminate frequency be scanned measure, and according to adjust after radio frequency,
Frequency relation formula LO of intermediate frequency and local oscillator1=RFAdjust+IF2Automatically control the output frequency of the local vibration source of first order converter, from
The initial frequency lock-and-follow scan of the local vibration source of one-level converter, to terminating frequency, keeps the radio frequency after adjusting and first order frequency conversion
The synchronous scanning of the local vibration source of device, obtains the sweep measurement result of noise coefficient, is designated as NFMeasure。
Multistage frequency conversion device noise coefficient the most according to claim 1 automatic scanning survey method, it is characterised in that: in step
In rapid 5, according to correction formula NFRevise=NFMeasure+ENRRF (actual)-ENRRF (adjusts)To sweep measurement result NFMeasureAutomatically repair
Positive method, specifically includes
Step 5.1: set up the loss balancing table before measured piece, specifically include
Step 5.1.1: press the loss balancing key of acoustic meter, configuration loss balancing type is: form before DUT；
Step 5.1.2: by the temperature Menu key of acoustic meter, Temperature numerical before input DUT；
Step 5.1.3: by the loss balancing table Menu key of acoustic meter, set up the loss balancing form before measured piece；
Step 5.2: the frequency arranging loss balancing table is the rf frequency after adjusting, and according to noise source excess noise ratio spot frequency
The value of point inputs corresponding offset by compensation value calculation formula (1) successively；
Offset=ENRRF (adjusts)-ENRRF (actual)(1)；
Step 5.3: arrange the state of loss balancing table, is arranged loss balancing: DUT in acoustic meter calibration process as follows
The Configuration Type of loss balancing, for closing, is arranged: form before DUT during measuring by front state as follows；
Step 5.4: by RFAdjustIn the range of excess noise ratio value ENRRF (adjusts)It is modified to RFActualIn the range of corresponding excess noise ratio value
ENRRF (actual), the actual noise coefficient of measured piece after being revised.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441621A (en) * | 2019-08-19 | 2019-11-12 | 苏州华兴源创科技股份有限公司 | Measurement method, device, equipment and the storage medium of noise coefficient |
| CN112067914A (en) * | 2020-08-04 | 2020-12-11 | 中电科仪器仪表有限公司 | Method for correcting error introduced by extra network in noise coefficient measurement |
| CN112067915A (en) * | 2020-08-04 | 2020-12-11 | 中电科仪器仪表有限公司 | Noise source calibration system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110441621A (en) * | 2019-08-19 | 2019-11-12 | 苏州华兴源创科技股份有限公司 | Measurement method, device, equipment and the storage medium of noise coefficient |
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| CN112067914A (en) * | 2020-08-04 | 2020-12-11 | 中电科仪器仪表有限公司 | Method for correcting error introduced by extra network in noise coefficient measurement |
| CN112067915A (en) * | 2020-08-04 | 2020-12-11 | 中电科仪器仪表有限公司 | Noise source calibration system |
| CN112067915B (en) * | 2020-08-04 | 2022-05-06 | 中电科思仪科技股份有限公司 | Noise source calibration system |
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