CN209559973U - A kind of frequency-characteristic measuring-testing instrument based on DDS technology - Google Patents
A kind of frequency-characteristic measuring-testing instrument based on DDS technology Download PDFInfo
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- CN209559973U CN209559973U CN201920056666.7U CN201920056666U CN209559973U CN 209559973 U CN209559973 U CN 209559973U CN 201920056666 U CN201920056666 U CN 201920056666U CN 209559973 U CN209559973 U CN 209559973U
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- frequency
- characteristic measuring
- testing instrument
- signal source
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Abstract
The utility model discloses a kind of frequency-characteristic measuring-testing instruments based on DDS technology, it is related to frequency-characteristic measuring-testing instrument technical field, the frequency-characteristic measuring-testing instrument based on DDS technology, including control and data processing circuit, orthogonal swept signal source, tested network, zero intermediate frequency quadrature demodulation, amplitude measurement, phase measurement and graphical display and man-machine interface partial circuit, the control and data processing circuit are connected with orthogonal swept signal source.The frequency-characteristic measuring-testing instrument based on DDS technology, orthogonal scanning signal source uses direct digital synthesis technique (DDS) the chip AD9858 of low cost, low-power consumption, high-resolution and fast conversion times on the market, realize broadband swept signal source, swept frequency range can be arbitrarily arranged, it can effectively avoid traditional frequency-characteristic measuring-testing instrument volume big, equipment is heavy, high failure rate, it is complicated for operation expensive, what is had can only measure amplitude-frequency characteristic, and precision is not high, the problem of poor anti jamming capability.
Description
Technical field
The utility model relates to frequency-characteristic measuring-testing instrument technical field, specially a kind of frequency characteristic based on DDS technology
Tester.
Background technique
Frequency-characteristic measuring-testing instrument is also sweep generator, the frequency characteristic test of early stage be by manually change the method for frequency by
Point is measured, and devises measurement of the special sweep generator for frequency characteristic, the measuring instrument of early stage according to the method later
Mostly realize each function using discrete component, display portion is also with traditional oscillograph, so volume is big, equipment is heavy,
High failure rate, complicated for operation expensive, what is had can only measure amplitude-frequency characteristic, and precision is not high, poor anti jamming capability, later,
With the development of frequency synthesis technique and microelectric technique, frequency-characteristic measuring-testing instrument is also improved, and Sweep Source is using number
Amount controlled, derived digital signal can make up discrete component obtain it is insufficient, measurement part also carried out digitized improvement, mostly
Control and operation is carried out using single-chip microcontroller, improves the precision of measurement, still, mostly in low-frequency range (being less than 1MHZ), test
The intelligence degree of instrument be not still it is very high, swept frequency range is also not very wide, and phase measurement accuracy is also not very high, although having one
A little testers also have a very high precision and very wide swept frequency range, but price and its valuableness, in recent years, with modern electric
The rapid development of sub- technology, various instruments are all to miniaturization, and digitlization is intelligent, and the development in low-power consumption direction, frequency characteristic is surveyed
Instrument is tried as a kind of important measuring instrument, is also constantly being developed, increasingly due to direct digital synthesis technique (DDS) technology
Maturation realizes that digitlization opens road for frequency-characteristic measuring-testing instrument, and the maturation of LCD Technology makes frequency characteristic test
Instrument miniaturization is possibly realized.
Currently, the existing tester for frequency characteristic, inconvenient for use, it is unfavorable for promoting the use of.
Utility model content
(1) the technical issues of solving
In view of the deficiencies of the prior art, the utility model provides a kind of frequency-characteristic measuring-testing instrument based on DDS technology, solution
It has determined the existing tester for frequency characteristic, it is inconvenient for use, it is unfavorable for the problem of promoting the use of.
(2) technical solution
In order to achieve the above object, the utility model is achieved by the following technical programs:
A kind of frequency-characteristic measuring-testing instrument based on DDS technology, including control and data processing circuit, orthogonal swept-frequency signal
Source, tested network, zero intermediate frequency quadrature demodulation, amplitude measurement, phase measurement and graphical display and man-machine interface partial circuit, it is described
Control and data processing circuit are connected with orthogonal swept signal source, and the orthogonal swept signal source is connected with tested network, described
Tested network is connected with zero intermediate frequency quadrature demodulation, and the zero intermediate frequency quadrature demodulation difference amplitude measurement is connected with phase measurement, institute
It states amplitude measurement and phase measurement to be connected with control and data processing circuit, the control and data processing circuit and figure are shown
Show and man-machine interface partial circuit is connected.
Optionally, the orthogonal swept signal source uses direct digital synthesis technique (DDS) chip AD9858, and broadband is swept
Frequency source signal.
Optionally, the liquid crystal display of the graphical display and man-machine interface partial circuit uses TFT color screen.
Optionally, using STM32 as the single-chip microcontroller of dominant control, the single-chip microcontroller control is whole for the control and data processing circuit
A system coordination works and handles in real time institute's measured data.
Optionally, the signal of the zero intermediate frequency quadrature demodulation is acquired for the ADC on single-chip microcontroller, and calculates network under test
Amplitude-frequency characteristic and phase-frequency characteristic.
Optionally, the ADC on the single-chip microcontroller selects suitable digit high, and the ADC that cost performance is high.
(3) beneficial effect
The utility model provides a kind of frequency-characteristic measuring-testing instrument based on DDS technology, have it is following the utility model has the advantages that
(1), it is somebody's turn to do the frequency-characteristic measuring-testing instrument based on DDS technology, orthogonal scanning signal source is using low cost on the market, low function
Direct digital synthesis technique (DDS) chip AD9858 of consumption, high-resolution and fast conversion times realizes broadband swept-frequency signal
Source, swept frequency range can be arbitrarily arranged, and can effectively avoid traditional frequency-characteristic measuring-testing instrument volume big, and equipment is heavy, therefore
The problem of barrier rate is high, complicated for operation expensive, and what is had can only measure amplitude-frequency characteristic, and precision is not high, poor anti jamming capability, into
And the using effect of the device is effectively improved, enhance the practicability of the device.
(2), the frequency-characteristic measuring-testing instrument based on DDS technology, the liquid crystal of graphical display and man-machine interface partial circuit 7 are somebody's turn to do
Show device using TFT color screen, can be used in showing amplitude-frequency and phase-frequency characteristic curve, and show text annotation, make man-machine interface circle
Friend is good, after user carried out the drafting of primary characteristic curve, settable cursor, and can move left and right and check stepping point
Voltage gain and phase shift.
Detailed description of the invention
Fig. 1 is the system diagram of the utility model；
Fig. 2 is the system diagram of the utility model orthogonal scanning signal source；
Fig. 3 is the circuit diagram of the utility model zero intermediate frequency orthogonal demodulation circuit figure；
Fig. 4 is the design flow diagram of the utility model STM32 process control frame.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " suitable
The orientation or positional relationship of the instructions such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is orientation based on the figure
Or positional relationship, be merely for convenience of describing the present invention and simplifying the description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limit to the utility model
System.
In the present invention unless specifically defined or limited otherwise, term " setting ", " connected ", " connects " installation "
Connect ", the terms such as " fixation " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection；It can be machine
Tool connection；It can be directly connected, it can also be indirectly connected through an intermediary.For those of ordinary skill in the art and
Speech, can understand the concrete meaning of above-mentioned term in the present invention as the case may be.
Fig. 1-4 is please referred to, the utility model provides a kind of technical solution:
A kind of frequency-characteristic measuring-testing instrument based on DDS technology, including control and data processing circuit, orthogonal swept-frequency signal
Source, tested network, zero intermediate frequency quadrature demodulation, amplitude measurement, phase measurement and graphical display and man-machine interface partial circuit, control
And data processing circuit is connected with orthogonal swept signal source, orthogonal swept signal source is connected with tested network, tested network and zero
Intermediate frequency quadrature demodulation is connected, and zero intermediate frequency quadrature demodulation difference amplitude measurement is connected with phase measurement, amplitude measurement and phase measurement
Be connected with control and data processing circuit, control and data processing circuit and graphical display and man-machine interface partial circuit phase
Even.
A kind of optional technical solution as the utility model: orthogonal swept signal source uses direct digital synthesis technique
(DDS) chip AD9858, broadband swept signal source, orthogonal scanning signal source is using low cost, low-power consumption, high-resolution on the market
Direct digital synthesis technique (DDS) chip AD9858 of rate and fast conversion times realizes broadband swept signal source, frequency sweep model
Enclosing arbitrarily to be arranged, and can effectively avoid traditional frequency-characteristic measuring-testing instrument volume big, and equipment is heavy, high failure rate, behaviour
Make the problem of complexity is expensive, and what is had can only measure amplitude-frequency characteristic, and precision is not high, poor anti jamming capability.
A kind of optional technical solution as the utility model: the liquid crystal display of graphical display and man-machine interface partial circuit
Device uses TFT color screen, for showing amplitude-frequency and phase-frequency characteristic curve, and shows text annotation, keeps man-machine interface friendly.
After user carried out the drafting of primary characteristic curve, settable cursor, and move left and right the voltage gain for checking stepping point
And phase shift.
A kind of optional technical solution as the utility model: control and data processing circuit are using STM32 as dominant control
Single-chip microcontroller, single-chip microcontroller control whole system co-ordination are simultaneously in real time handled institute's measured data, and single-chip microcontroller completes whole system
Control, data acquisition, processing and display and operation interface management.
A kind of optional technical solution as the utility model: the signal of zero intermediate frequency quadrature demodulation is for the ADC on single-chip microcontroller
Acquisition, and the amplitude-frequency characteristic and phase-frequency characteristic of network under test are calculated, by the sinusoidal signal of orthogonal scanning signal source wherein all the way
As the excitation of network under test, the output of network under test is multiplied with the orthogonal signalling of former two-way respectively, by low-pass filtering, obtains
DC quantity can analyze the amplitude-frequency characteristic and phase frequency of network according to zero intermediate frequency quadrature demodulation principle after the ADC acquisition on single-chip microcontroller
Characteristic.
A kind of optional technical solution as the utility model: the ADC on single-chip microcontroller selects suitable digit high, and cost performance
High ADC will select suitable digit high as far as possible in order to reduce the error of measurement, and the high ADC of cost performance is adjusted by control
The input common mode voltage of the differential amplification of the gain and zero intermediate frequency orthogonal demodulation circuit of the controllable gain amplifier of swept signal source
Suitable acquisition signal is provided for the signal acquisition of ADC.
In conclusion the frequency-characteristic measuring-testing instrument based on DDS technology is somebody's turn to do, in use, orthogonal scanning signal source uses market
Upper low cost, low-power consumption, high-resolution and fast conversion times direct digital synthesis technique (DDS) chip AD9858, realize
Broadband swept signal source, swept frequency range can be arbitrarily arranged, and can effectively avoid traditional frequency-characteristic measuring-testing instrument volume
Greatly, equipment is heavy, and high failure rate is complicated for operation expensive, and what is had can only measure amplitude-frequency characteristic, and precision is not high, anti-interference
The problem of ability difference, and then effectively improve the using effect of the device, enhances the practicability of the device, graphical display and man-machine
The liquid crystal display of interface section circuit uses TFT color screen, can be used in showing amplitude-frequency and phase-frequency characteristic curve, and show text
Word is explained, and keeps man-machine interface friendly, after user carried out the drafting of primary characteristic curve, settable cursor, and can
Move left and right the voltage gain for checking stepping point and phase shift.
It should be noted that in the present invention unless specifically defined or limited otherwise, fisrt feature is in the second spy
It can be that the first and second features directly contact or the first and second features are connect indirectly by intermediary "above" or "below" sign
Touching.Moreover, fisrt feature can be above the second feature " above ", " above " and " above " fisrt feature right above second feature or
Oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature second feature " under ", " lower section "
" following " can be fisrt feature and be directly under or diagonally below the second feature, or is merely representative of first feature horizontal height and is less than
Second feature.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art is within the technical scope disclosed by the utility model, practical according to this
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (6)
1. a kind of frequency-characteristic measuring-testing instrument based on DDS technology, including control and data processing circuit, orthogonal swept signal source,
Tested network, zero intermediate frequency quadrature demodulation, amplitude measurement, phase measurement and graphical display and man-machine interface partial circuit, feature
It is:
The control and data processing circuit are connected with orthogonal swept signal source, the orthogonal swept signal source and tested network phase
Even, the tested network is connected with zero intermediate frequency quadrature demodulation, the zero intermediate frequency quadrature demodulation difference amplitude measurement and phase measurement
It is connected, the amplitude measurement and phase measurement are connected with control and data processing circuit, the control and data processing circuit
It is connected with graphical display and man-machine interface partial circuit.
2. a kind of frequency-characteristic measuring-testing instrument based on DDS technology according to claim 1, which is characterized in that
The orthogonal swept signal source uses direct digital synthesis technique (DDS) chip AD9858, broadband swept signal source.
3. a kind of frequency-characteristic measuring-testing instrument based on DDS technology according to claim 1, which is characterized in that
The liquid crystal display of the graphical display and man-machine interface partial circuit uses TFT color screen.
4. a kind of frequency-characteristic measuring-testing instrument based on DDS technology according to claim 1, which is characterized in that
Using STM32 as the single-chip microcontroller of dominant control, the single-chip microcontroller control whole system is coordinated for the control and data processing circuit
It works and institute's measured data is handled in real time.
5. a kind of frequency-characteristic measuring-testing instrument based on DDS technology according to claim 1, which is characterized in that
The signal of the zero intermediate frequency quadrature demodulation on single-chip microcontroller ADC acquire, and calculate network under test amplitude-frequency characteristic and
Phase-frequency characteristic.
6. a kind of frequency-characteristic measuring-testing instrument based on DDS technology according to claim 5, which is characterized in that
ADC on the single-chip microcontroller selects suitable digit high, and the ADC that cost performance is high.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920056666.7U CN209559973U (en) | 2019-01-14 | 2019-01-14 | A kind of frequency-characteristic measuring-testing instrument based on DDS technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920056666.7U CN209559973U (en) | 2019-01-14 | 2019-01-14 | A kind of frequency-characteristic measuring-testing instrument based on DDS technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209559973U true CN209559973U (en) | 2019-10-29 |
Family
ID=68306168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920056666.7U Expired - Fee Related CN209559973U (en) | 2019-01-14 | 2019-01-14 | A kind of frequency-characteristic measuring-testing instrument based on DDS technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209559973U (en) |
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2019
- 2019-01-14 CN CN201920056666.7U patent/CN209559973U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191029 Termination date: 20200114 |