CN109709410A - A kind of noise source and its application method based on USB - Google Patents
A kind of noise source and its application method based on USB Download PDFInfo
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- CN109709410A CN109709410A CN201811607014.4A CN201811607014A CN109709410A CN 109709410 A CN109709410 A CN 109709410A CN 201811607014 A CN201811607014 A CN 201811607014A CN 109709410 A CN109709410 A CN 109709410A
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- noise
- noise source
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Abstract
The present invention provides a kind of noise source and its application method based on USB, noise source includes shell, one end of shell is provided with USB interface, it is provided with Power Management Unit, digital control unit and noise inside the shell, microwave components occur, Power Management Unit includes power adapter, and power adapter is electrically connected with current regulator.Digital control unit includes USB controller, IO control processing core, digital temperature sensor and eeprom memory.The plug and play connection type of USB interface is flexible, simple and direct, so that not needing additional special purpose interface can be realized the connection of noise source and instrument, improve system building speed, effectively solve the driving and use of noise source under the system supported without special purpose interface, measuring system settling time is saved, the scope of application of noise source is expanded.Noise source internal calibration automatic data-check and upload, reduce the chance of human error；Internal real time temperature monitoring and automatic error amendment, reduce the uncertainty of noise-factor measurement, improve measurement accuracy.
Description
Technical field
The present invention relates to noise source domains, and in particular to a kind of noise source and its application method based on USB.
Background technique
Noise coefficient is that characterization receiver and its building block handle small-signal in the presence of having thermal noise
One of key parameter of ability indicates the reduction degree of signal-to-noise ratio when signal passes through a device or equipment.With hyundai electronics
The fast development of technology, noise-factor measurement is in fields such as radar, communication, low-noise reception system, microwave manufactures using more
It is extensively and important.The performance indicator of design not only can be improved in quick, the accurate measurement of noise coefficient, shortens newly-designed verifying
Lead time can also greatly improve production detection and the measurement efficiency of product.
Noise source is based on an important component part in Y factor method noise coefficient test macro, it is measured piece
(DUT) accurate, stable noise excitation signal is provided.No matter the calibration or measurement process of noise coefficient, require connection one
A calibrated noise source for crossing excess noise ratio (ENR), in certain testing situations, or even also needs multiple noise sources repeatedly to connect
Complete noise-factor measurement just can be achieved.Noise source it is correct, quick, be stably connected with and test, be directly related to and finally make an uproar
The speed and accuracy of measurement of sound test.
Existing noise source can be divided into normal noise source and intelligent noise source two types according to interface form.Normal noise
Source needs the external driving voltage for providing a 28V to control opening for noise source using BNC cable connection noise source and test equipment
The pass and.Intelligent noise source in addition to need it is external driving voltage is provided other than, there are one dedicated compound I2C bus interface form,
It is real by I2C bus it is necessary that connecting use with instrument with a dedicated multicore driving cable when carrying out noise coefficient test
The control of existing intelligent noise source ON/OFF.Regardless of using which kind of noise source, at the same the measuring instrument connected must all have this two
Kind special purpose interface is supported.These conditions largely constrain the use of noise source.In the system that no special instrument is built
In, in order to realize that noise coefficient test then needs the software/hardware of additional power supply and interface to support, not only increase the survey of user
Cost is tried, user's test macro is also added and establishes period and system complexity.
In addition, if I2C bus apparatus more than one in measuring instrument, when two or more I2C bus apparatus all have
When high frequency time real-time monitoring and information exchange, bus apparatus control hazard is easily caused, causes wrong measurement, to reduce noise
The stability of coefficient measurement.
Summary of the invention
For disadvantage existing in the prior art, the first object of the present invention there is provided a kind of noise source based on USB,
The versatility of noise source connecting interface and the diversity that instrument can be connected in test are extended, test speed, measurement accuracy are improved
With measurement stability.
The following technical solution is employed by the present invention:
A kind of noise source based on USB, including shell, one end of shell are provided with USB interface, are provided with electricity inside the shell
Microwave components occur for source control unit, digital control unit and noise, and Power Management Unit includes power adapter, power supply conversion
Device is electrically connected with current regulator；
The digital control unit includes USB controller, IO control processing core, digital temperature sensor and EEPROM storage
Device, USB controller and IO control processing nuclear power and connects, IO control processing core pass through internal data bus respectively with digital temperature control
Device and eeprom memory electrical connection processed；
The IO control processing core is electrically connected by digital analog converter with current regulator, and current regulator and noise occur
Microwave components are connected；
The power adapter and USB controller are connected with USB interface.
Preferably, it includes noise tube that microwave components, which occur, for the noise, and noise tube is connected with blocking module, and blocking module connects
It is connected to attenuator.
Preferably, the IO control processing core is based on Design of Complicated Programmable Logic Devices, IO control processing core packet
Include noise source calibration excess noise ratio information checking, monitoring internal temperature Trigger Function synchronous with acquisition and temperature change.
There is provided a kind of application methods of noise source based on USB for the second object of the present invention.
A kind of application method of the noise source based on USB, comprising the following steps:
Step 1: noise source being connected by USB interface with test host, is powered on for noise source, noise source is initialized and held
Row built in self testing, IO control processing core obtain the data in eeprom memory by internal data bus, and stored
The verification of calibrated information detects；
If powering on, verifying Data Detection failure, there is LED status to show respectively；Detection is correct then ready into work
State waits the order for carrying out self-test host；
Meanwhile IO control processing core starts to obtain current noise source internal temperature from digital temperature sensor, passes through temperature
Compare synchronous triggering temperature change signal, etc. host to be tested read；
Step 2: test host automatic identification noise source, it is automatic to load noise source parameter；
Host is tested after noise source connection, the automatic identification and connection status for determining this noise source is surveyed if having connected
Examination host send immediately it is calibrated cross excess noise ratio reading order, complete noise source built in it is calibrated cross excess noise ratio data from
Dynamic load and display；
Step 3: test host synchronization triggering noise source temperature updates mark, reads real-time noise source internal temperature, storage
And it shows；
Step 4: obtaining noise source "ON" "Off" noise power, execute temperature error amendment, calculate noise coefficient；
It tests host and sends the noise source "ON" of present frequency point, "Off" order, control processing core by IO and pass through digital-to-analogue
Converter controls current regulator, and current regulator drives the output of noise tube wide band noise level；
It tests host and reads the power level of noise, calculate noise coefficient, and execute temperature error amendment.
The invention has the advantages that:
The plug and play connection type of noise source provided by the invention based on USB, USB interface is flexible, simple and direct, so that not
It needs additional special purpose interface that the connection of noise source and instrument can be realized, improves system building speed, effectively solve without dedicated
The driving and use of noise source under the system that interface is supported, save measuring system settling time, expand the scope of application of noise source.
Noise source internal calibration automatic data-check and upload, reduce the chance of human error, and it is fast with measurement to improve calibration
Degree.Real time temperature monitoring and automatic error amendment, reduce the uncertainty of noise-factor measurement inside noise source, improve measurement essence
Degree.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the noise source based on USB.
Fig. 2 is the application method flow chart of the noise source based on USB.
Specific embodiment
A specific embodiment of the invention is described further in the following with reference to the drawings and specific embodiments:
Embodiment 1
In conjunction with Fig. 1, a kind of noise source based on USB, including shell is provided with USB interface on shell, is arranged inside the shell
There are Power Management Unit, digital control unit and noise that microwave components occur.
USB interface is general-purpose interface, is real time data transmission and information interactive interface between noise source and measurement host.
USB interface has plug and play, the advantage that connection type is flexible, simple and direct.
It is USB-A type mouth that connecting cable, which tests host side, and noise source is USB-B type 5pin interface.
Power Management Unit includes power adapter, and power adapter is electrically connected with current regulator.
Power conversion module is responsible for the+5V voltage USB interface by a series of voltage conversion circuit, generates driving noise
Operating voltage (may be designed as positive bias or back bias voltage according to different excess noise ratio) under different conditions needed for pipe, and be number control
Unit processed provides operating voltage and supports.Voltage after conversion exports a constant-current source by current regulator, exports for noise tube
Wide band noise level provides a positive bias electric current or negative bias electric current.
Current regulator can provide the "on" and "off" two states of noise for Y factor noise-factor measurement.
Digital control unit includes USB controller, IO control processing core, digital temperature sensor and eeprom memory,
USB controller controls processing nuclear power with IO and connect, and IO control processing core is controlled with digital temperature respectively by internal data bus
Device and eeprom memory electrical connection.
Power adapter and USB controller are connected with USB interface.
USB controller uses the USB controller of Cypress company, realizes that the data of measuring instrument and USB noise source are handed over
It changes.
IO control processing core is based on Design of Complicated Programmable Logic Devices, and IO control processing core includes noise source calibration
Excess noise ratio information checking, monitoring internal temperature Trigger Function synchronous with acquisition and temperature change.
IO control processing core is electrically connected by digital analog converter with current regulator, and microwave occurs for current regulator and noise
Component is connected.
It includes noise tube that microwave components, which occur, for noise, and noise tube is connected with blocking module, and blocking module is connected with attenuator.
Embodiment 2
In conjunction with Fig. 2, a kind of application method of the noise source based on USB, comprising the following steps:
Step 1: noise source being connected by USB interface with test host, is powered on for noise source, noise source is initialized and held
Row built in self testing, IO control processing core obtain the data in eeprom memory by internal data bus, and stored
The verification of calibrated information detects；
If powering on, verifying Data Detection failure, there is LED status to show respectively；Detection is correct then ready into work
State waits the order for carrying out self-test host；
Meanwhile IO control processing core starts to obtain current noise source internal temperature from digital temperature sensor, passes through temperature
Compare synchronous triggering temperature change signal, etc. host to be tested read.
Step 2: test host automatic identification noise source, it is automatic to load noise source parameter；
Host is tested after noise source connection, carries out USB enumeration, automatic identification and the connection status for determining this noise source,
If having connected, test host send immediately it is calibrated cross excess noise ratio reading order, complete calibrated mistake built in noise source
The automatic load and display of excess noise ratio data.
Step 3: test host synchronization triggering noise source temperature updates mark, reads real-time noise source internal temperature, storage
And it shows.
Step 4: obtaining noise source "ON" "Off" noise power, execute temperature error amendment, calculate noise coefficient；
It tests host and sends the noise source "ON" of present frequency point, "Off" order, control processing core by IO and pass through digital-to-analogue
Converter controls current regulator, and current regulator drives the output of noise tube wide band noise level；It tests host and reads noise function
Rate level calculates noise coefficient, and executes temperature error amendment.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (4)
1. a kind of noise source based on USB, which is characterized in that including shell, one end of shell is provided with USB interface, in shell
It is inside provided with Power Management Unit, digital control unit and noise and microwave components occurs, Power Management Unit includes power supply conversion
Device, power adapter are electrically connected with current regulator；
The digital control unit includes USB controller, IO control processing core, digital temperature sensor and eeprom memory,
USB controller controls processing nuclear power with IO and connect, and IO control processing core is controlled with digital temperature respectively by internal data bus
Device and eeprom memory electrical connection；
The IO control processing core is electrically connected by digital analog converter with current regulator, and microwave occurs for current regulator and noise
Component is connected；
The power adapter and USB controller are connected with USB interface.
2. a kind of noise source based on USB according to claim 1, which is characterized in that microwave components occur for the noise
Including noise tube, noise tube is connected with blocking module, and blocking module is connected with attenuator.
3. a kind of noise source based on USB according to claim 1, which is characterized in that the IO control processing core is base
In Design of Complicated Programmable Logic Devices, IO control processing core includes noise source calibration excess noise ratio information checking, internal temperature
Monitoring Trigger Function synchronous with acquisition and temperature change.
4. according to claim 1 to a kind of application method of noise source based on USB described in 3 any one, which is characterized in that
The following steps are included:
Step 1: noise source being connected by USB interface with test host, is powered on for noise source, noise source is initialized and executed interior
Portion's self-test, IO control processing core obtain the data in eeprom memory, and the school stored by internal data bus
The verification of calibration information detects；
If powering on, verifying Data Detection failure, there is LED status to show respectively；Detection is correct then to enter the ready shape of work
State waits the order for carrying out self-test host；
Meanwhile IO control processing core starts to obtain current noise source internal temperature from digital temperature sensor, is compared by temperature
Synchronous triggering temperature change signal, etc. host to be tested read；
Step 2: test host automatic identification noise source, it is automatic to load noise source parameter；
Host is tested after noise source connection, automatic identification and the connection status for determining this noise source test master if having connected
Machine sends calibrated excess noise ratio reading order excessively immediately, completes calibrated the automatic of excess noise ratio data excessively built in noise source and adds
It carries and shows；
Step 3: test host synchronization triggering noise source temperature updates mark, reads real-time noise source internal temperature, stores and show
Show；
Step 4: obtaining noise source "ON" "Off" noise power, execute temperature error amendment, calculate noise coefficient；
It tests host and sends the noise source "ON" of present frequency point, "Off" order, control processing core by IO and pass through digital-to-analogue conversion
Device controls current regulator, and current regulator drives the output of noise tube wide band noise level；
It tests host and reads the power level of noise, calculate noise coefficient, and execute temperature error amendment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811607014.4A CN109709410A (en) | 2018-12-27 | 2018-12-27 | A kind of noise source and its application method based on USB |
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| CN201811607014.4A CN109709410A (en) | 2018-12-27 | 2018-12-27 | A kind of noise source and its application method based on USB |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111984655A (en) * | 2020-08-31 | 2020-11-24 | 中国电子科技集团公司第四十一研究所 | Intelligent noise source calibration data firmware storage expansion method |
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| CN202282781U (en) * | 2011-11-01 | 2012-06-20 | 南京鑫轩电子系统工程有限公司 | TR assembly automatic test system |
| CN103389410A (en) * | 2013-07-10 | 2013-11-13 | 中国电子科技集团公司第四十一研究所 | Microwave power testing device based on universal serial bus (USB) interface |
| CN103957067A (en) * | 2014-04-21 | 2014-07-30 | 清华大学 | Automatic testing device and system of demodulator |
| CN104391284A (en) * | 2014-12-04 | 2015-03-04 | 中国电子科技集团公司第四十一研究所 | Numerical control excess noise ratio noise source and achieving method thereof |
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2018
- 2018-12-27 CN CN201811607014.4A patent/CN109709410A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080170610A1 (en) * | 2007-01-11 | 2008-07-17 | Harper Marcellus C | High Speed Serial Test Circuits |
| CN202282781U (en) * | 2011-11-01 | 2012-06-20 | 南京鑫轩电子系统工程有限公司 | TR assembly automatic test system |
| CN103389410A (en) * | 2013-07-10 | 2013-11-13 | 中国电子科技集团公司第四十一研究所 | Microwave power testing device based on universal serial bus (USB) interface |
| CN103957067A (en) * | 2014-04-21 | 2014-07-30 | 清华大学 | Automatic testing device and system of demodulator |
| CN104391284A (en) * | 2014-12-04 | 2015-03-04 | 中国电子科技集团公司第四十一研究所 | Numerical control excess noise ratio noise source and achieving method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111984655A (en) * | 2020-08-31 | 2020-11-24 | 中国电子科技集团公司第四十一研究所 | Intelligent noise source calibration data firmware storage expansion method |
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Application publication date: 20190503 |
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