CN209086785U - A kind of multichannel generator based on board - Google Patents
A kind of multichannel generator based on board Download PDFInfo
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- CN209086785U CN209086785U CN201822067201.XU CN201822067201U CN209086785U CN 209086785 U CN209086785 U CN 209086785U CN 201822067201 U CN201822067201 U CN 201822067201U CN 209086785 U CN209086785 U CN 209086785U
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Abstract
The application belongs to signal generator field, specifically disclose a kind of multichannel generator based on board, it include: board, there is the first card slot and multiple second card slots disposed in parallel on the board, wherein: the same end of each second card slot is arranged in first card slot, and is electrically connected each second card slot；Multiple signal condition channels, each signal condition channel passes through second card slot respectively and is integrated on the board, for receiving and improving Wave data；Control unit, described control unit are integrated on the board by first card slot, for providing and distributing Wave data to each signal condition channel.The application realizes the integrated of multichannel generator by the first card slot of setting and multiple second card slots disposed in parallel, due to realizing the transmission of signal by the wiring on snap-gauge, compared to not by snap-gauge, wiring space is greatly reduced, ensure that the integration and miniaturization of multichannel generator.
Description
Technical field
The application belongs to signal generator field, especially a kind of multichannel generator based on board.
Background technique
Arbitrary waveform generator (Arbitrary waveform generator, AWG) is used to generate various analog signals,
Other than common square wave, triangular wave, sine wave, impulse wave, moreover it is possible to generate more modulation wave.AWG is used in laboratory or life
It produces and locally produces complicated waveform, a kind of convenient approach is provided to the response of complicated wave form for test Devices to test.
The each channel of multichannel generator of the prior art is prepared separately, and is then placed directly in instrument
Portion causes multichannel generator overall volume larger.
Summary of the invention
The purpose of the application is to provide a kind of multichannel generator based on board, to solve in the prior art
Deficiency, it can be realized the integration and miniaturization of multichannel generator.
The application the technical solution adopted is as follows:
A kind of multichannel generator based on board, wherein include:
Board has the first card slot and multiple second card slots disposed in parallel on the board, in which: first card slot
The same end of each second card slot is set, and is electrically connected each second card slot；
Multiple signal condition channels, each signal condition channel pass through respectively second card slot be integrated in it is described
On board, for receiving and improving Wave data；
Control unit, described control unit is integrated on the board by first card slot, for providing and distributing
Wave data gives each signal condition channel.
Multichannel generator based on board as described above, wherein preferred, the signal condition channel
Include:
Digital analog converter module, input terminal connects the output end of described control unit, for acquiring the waveform
Data, the processing Wave data and output difference signal；
Operational amplifying module, input terminal connect the output end of the digital analog converter module, described for receiving
Differential signal, the processing Wave data simultaneously export single-ended signal.
Wherein: the bandwidth of the operational amplifying module is equal to the half of the sample rate of the digital analog converter module.
Multichannel generator based on board as described above, wherein preferred, the digital-to-analogue conversion
Device module includes:
Current-output type digital-to-analogue conversion unit, for acquiring the Wave data, the processing Wave data and output difference
Sub-signal；
First resistor, one end connect the in-phase output end of the current-output type digital-to-analogue conversion unit, other end ground connection；
Second resistance, one end connect the reversed-phase output of the current-output type digital-to-analogue conversion unit, other end ground connection.
Multichannel generator based on board as described above, wherein preferred, the digital-to-analogue conversion
Device module further include:
First capacitor, one end connect the in-phase output end of the current-output type digital-to-analogue conversion unit, other end ground connection；
Second capacitor, one end connect the reversed-phase output of the current-output type digital-to-analogue conversion unit, other end ground connection.
Multichannel generator based on board as described above, wherein preferred, the operational amplifying module
Include:
Operation amplifier unit, it is single that the non-inverting input terminal of the operation amplifier unit connects the current-output type digital-to-analogue conversion
The in-phase output end of member, the inverting input terminal of the operation amplifier unit connect the anti-of the current-output type digital-to-analogue conversion unit
Phase output terminal.
Multichannel generator based on board as described above, wherein preferred, the operational amplifying module
Further include:
3rd resistor, one end are connected to the inverting input terminal of the operation amplifier unit, and it is defeated that the other end connects the electric current
The reversed-phase output of type digital-to-analogue conversion unit out；
4th resistance, one end are connected to the inverting input terminal of the operation amplifier unit, other end ground connection.
Multichannel generator based on board as described above, wherein preferred, the operational amplifying module
Further include:
5th resistance, one end are connected to the output end of the operation amplifier unit, and the other end is connected with connector.
Multichannel generator based on board as described above, wherein preferred, the operational amplifying module
Further include:
Third capacitor, one end connect the output end of the operation amplifier unit, other end ground connection by the 5th resistance.
Multichannel generator based on board as described above, wherein preferred, the operational amplifying module
Further include:
High-frequency isolation circuit is arranged on the power supply circuit of the operation amplifier unit.
Multichannel generator based on board as described above, wherein preferred, the fortune on the board
Calculate the reference layer hollow out of the input terminal position of amplification module；
The reference layer hollow out of the output end position of the operational amplifying module on the board.
Compared with prior art, the application realizes multi-pass by the first card slot of setting and multiple second card slots disposed in parallel
Road arbitrary waveform generator integrates, and due to realizing the transmission of signal by the wiring on snap-gauge, compares not by snap-gauge, significantly
Reduce wiring space, ensure that the integration and miniaturization of multichannel generator.
Detailed description of the invention
Fig. 1 is the schematic diagram of multichannel generator provided by the present application；
Fig. 2 is the circuit diagram in the signal condition channel of one embodiment of the invention.
Specific embodiment
The embodiments described below with reference to the accompanying drawings are exemplary, is only used for explaining the application, and cannot be construed to
Limitation to the application.
Embodiments herein provides a kind of multichannel generator based on board, refering to Figure 1,
Multichannel generator includes board 1, control unit 2 and multiple signal condition channels 3.
There is the first card slot and multiple second card slots disposed in parallel, in which: the first card slot setting on the board 1
In the same end of each second card slot, and it is electrically connected each second card slot；Each signal condition channel 3 passes through one respectively
A second card slot is integrated on the board, for receiving and improving Wave data；Described control unit 2 passes through described the
One card slot is integrated on the board, for providing and distributing Wave data to each signal condition channel.
The application realizes multichannel by the first card slot of setting and multiple second card slots disposed in parallel
Device integrates, and due to realizing the transmission of signal by the wiring on snap-gauge, compares by snap-gauge, does not greatly reduce wiring sky
Between, it ensure that the integration and miniaturization of multichannel generator.
It waits in the specific implementation, the board selected is 18 layers of standard CPCI-6U board.Control unit 2 refers to that FPGA is mono-
Member communicates between FPGA unit and host computer, and FPGA unit can parse the control instruction that host computer issues, and what is parsed is interior
Appearance is the Wave data for including undulating path selection, waveform catalog, waveform frequency, phase, amplitude etc..
As the optimal technical scheme of the present embodiment, please continue to refer to shown in Fig. 1, the signal condition channel includes number
Analog converter module and operational amplifying module.
Digital analog converter module, i.e. DAC module (Digital to analog converter), input terminal connect
The output end for connecing described control unit, for acquiring the Wave data, the processing Wave data and output difference signal.
Operational amplifying module, input terminal connect the output end of the digital analog converter module, described for receiving
Differential signal, the processing Wave data simultaneously export single-ended signal.
Wherein: the bandwidth of the operational amplifying module is equal to the half of the sample rate of the digital analog converter module.
Specifically, the present embodiment uses the DAC module of 2GHz sample rate, the operational amplifying module of 1GHz bandwidth.According to sampling thheorem,
The data bandwidth of 1GHz may be implemented in the DAC module of 2GHz sample rate.
It as the optimal technical scheme of the present embodiment, please refers to shown in Fig. 2, the digital analog converter module includes electricity
Flow output type digital-to-analogue conversion unit (i.e. DAC unit), first resistor R469 and second resistance R472.
The output end of the input terminal connection described control unit of current-output type digital-to-analogue conversion unit, for acquiring the wave
Graphic data, the processing Wave data and output difference signal；One end of first resistor R469 connects the current-output type number
The in-phase output end of mould conversion unit, the other end ground connection of first resistor R469；One end of second resistance R472 connects the electricity
Flow the reversed-phase output of output type digital-to-analogue conversion unit, the other end ground connection of second resistance R472.
When specific implementation, the current-output type digital-to-analogue conversion unit of the present embodiment selection is ADI company
AD9739, this is the DAC unit of a 2GHz sample rate, and is current-output type.First is configured in the rear class of DAC unit
The output of the electric current of DAC unit is converted into voltage output on one side by resistance R469 and second resistance R472, and on the other hand the
One resistance R469 and second resistance R472 carries out the output of DAC unit and rear class transmission line impedance as impedance matching resistor
Matching.
When setting, it is contemplated that the DAC element output signal bandwidth that the present embodiment uses is in 1GHz, in this frequency range
Signal wavelength it is very short, need to consider the problems of signal integrity, if not considering the problems of that signal integrity will lead to sternly
The wave distortion of weight, and then lead to the information of DAC unit output end output error.Signal Integrity Design is carried out mainly using resistance
Anti- matching and the continuous means of impedance, the present embodiment target are to be designed to 100 Europe of differential impedance and continuous, it is contemplated that in DAC
Portion's pin has the output resistance (equivalent resistance) in about 110 Europe, which needs obtain in parallel with first resistor R469
To the output resistance for being equivalent to 50 Europe, the output resistance that obtains be equivalent to 50 Europe in parallel with second resistance R472, two 50 Europe are closed
Get up be exactly 100 Europe differential impedance, with rear class Impedance Matching on Transmission Line, so in the present embodiment, first resistor R469 and
The equal value of second resistance R472 is 90.9 Europe.
As the optimal technical scheme of the present embodiment, the digital analog converter module further includes first capacitor C1041
With the second capacitor C1044.One end of first capacitor C1041 connects the same phase output of the current-output type digital-to-analogue conversion unit
End, the other end ground connection of first capacitor C1041；It is single that one end of second capacitor C1044 connects the current-output type digital-to-analogue conversion
The reversed-phase output of member, the other end ground connection of the second capacitor C1044.
First capacitor C1041 and the second capacitor C1044 is high-frequency filter capacitor, for filtering out the broadband of DAC unit output
Noise, when specific setting, the value of first capacitor C1041 and the second capacitor C1044 are set as equal, are 3.2 skins
Method.
As the optimal technical scheme of the present embodiment, please continue to refer to shown in Fig. 2, the operational amplifying module includes operation
Amplifying unit U98, the non-inverting input terminal of the operation amplifier unit U98 connect the same of the current-output type digital-to-analogue conversion unit
The inverting input terminal of phase output terminal, the operation amplifier unit U98 connects the reverse phase of the current-output type digital-to-analogue conversion unit
Output end.
As the optimal technical scheme of the present embodiment, the operational amplifying module further includes the electricity of 3rd resistor R602 and the 4th
R605 is hindered, one end of 3rd resistor R602 is connected to the inverting input terminal of the operation amplifier unit, and 3rd resistor R602's is another
One end connects the reversed-phase output of the current-output type digital-to-analogue conversion unit；One end of 4th resistance R605 is connected to institute
State the inverting input terminal of operation amplifier unit, the other end ground connection of the 4th resistance R605.
Operation amplifier unit U98,3rd resistor R602 and the 4th resistance R605 collectively form amplifying circuit, the amplifying circuit
Have 3 effects: 1. are converted into the differential signal that prime digital analog converter module transfer comes that can drive coaxial cable
Single-ended signal；2. gain is provided, by the voltage amplification of prime digital analog converter module output to client's required voltage；
3. the function of providing low-pass filtering can be used as since operation amplifier unit U98 inherently has the characteristic of low pass
Low-pass filter uses.
When concrete operations, single-ended principle, required gain and operation amplifier list are turned according to the difference of amplifier
3rd resistor R602 and the 4th resistance R605 is rationally arranged in gain resistor inside first U98, in the present embodiment, operation amplifier list
First U98 is the operational amplifier of model THS4302, the internal resistance (referred to as input impedance) there are two for gain is arranged,
Its value is respectively equal to 200 Europe and 49.9 Europe, the resistance of 3rd resistor R602 and the 4th resistance R605 as balance input impedance,
And need to guarantee that amplifying circuit is capable of providing 4 times of gain, by the peak of the 0.5v of prime digital analog converter module output
Threshold voltage is amplified to the crest voltage of the 2V of client's needs, so 200 Europe of 3rd resistor R602 value, the 4th resistance R605 value
49.9 Europe.
In addition, in view of the output impedance of the operation amplifier unit U98 of model THS4302 is very low, close to 0 Europe, in order to
Rear class transmission line carries out impedance matching, and as the optimal technical scheme of the present embodiment, the operational amplifying module further includes the 5th
Resistance R603, one end of the 5th resistance R603 are connected to the output end of the operation amplifier unit, and the 5th resistance R603's is another
End is connected with connector.The use of 5th resistance R603 can effectively reduce problems of Signal Integrity, provide for rear class high-quality
The signal of amount.When specific setting, the value of the 5th resistance R603 is set as 50 Europe.
In addition, in view of the operation amplifier unit U98 of model THS4302 is the amplifier and rear class electricity of a 2GHz bandwidth
Appearance can just provide the bandwidth of 1GHz together, so, as the optimal technical scheme of the present embodiment, the operational amplifying module is also
Including third capacitor C1163, third one end capacitor C1163 connects the output of the operation amplifier unit by the 5th resistance
End, other end ground connection.Third capacitor C1163 is high frequency capacitance, for filtering out the broadband noise of operation amplifier unit U98 introducing.
In the present embodiment, the value of third capacitor C1163 is set as 2.2 pico farads.
As the preferred embodiment of the present embodiment, the operational amplifying module further includes high-frequency isolation circuit, high-frequency isolation electricity
Road is arranged on the power supply circuit of the operation amplifier unit U98, realizes the high frequency to the power supply circuit of operation amplifier unit U98
The isolation processing of signal.
Specifically, magnetic bead can be arranged on the power supply circuit of operation amplifier unit U98, magnetic bead can be effectively isolated logical
The noise that power supply circuit passes to operation amplifier unit U98 is crossed, provides a clean power supply environment for operation amplifier unit U98,
It can be avoided scurrying out for the high-frequency signal of operation amplifier unit U98 simultaneously, the complete of the signal of operation amplifier unit U98 be effectively ensured
Whole property.
In addition, in the present embodiment, operation amplifier unit U98 works under 1GHz analog bandwidth, work is posted under the bandwidth
Raw capacitor will affect the stability of amplifier system, and then the features such as show overshoot, wave distortion.Therefore it is needed when board 1 designs
Output end is depended on according to the stability of amplifier principle operation amplifier unit U98 special consideration should be given to the control of parasitic capacitance
Parasitic capacitance value and input terminal parasitic capacitance value, as the optimal technical scheme of the present embodiment, the operation is put on the board
The reference layer hollow out of the input terminal position of big module；The output end institute of the operational amplifying module is in place on the board
Set the reference layer hollow out at place.The board that the present embodiment uses is 18 layers of standard CPCI-6U board, in reference layer hollow design
When, it, will be on board by the corresponding all equal hollow outs of reference layer of the input terminal position of operational amplifying module described on board
The corresponding equal hollow out of all reference layers of the output end position of the operational amplifying module.Effectively reduce operation amplifier
The output end parasitic capacitance value and input terminal parasitic capacitance value of unit U98.
The structure, feature and effect of the application, the above institute are described in detail based on the embodiments shown in the drawings
The preferred embodiment of only the application is stated, but the application does not limit the scope of implementation as shown in the drawings, all structures according to the application
Think made change or equivalent example modified to equivalent change, when not going beyond the spirit of the description and the drawings,
It should all be within the scope of protection of this application.
Claims (10)
1. a kind of multichannel generator based on board characterized by comprising
Board has the first card slot and multiple second card slots disposed in parallel on the board, in which: the first card slot setting
In the same end of each second card slot, and it is electrically connected each second card slot；
Multiple signal condition channels, each signal condition channel pass through second card slot respectively and are integrated in the board
On, for receiving and improving Wave data；
Control unit, described control unit is integrated on the board by first card slot, for providing and distributing waveform
Data give each signal condition channel.
2. the multichannel generator according to claim 1 based on board, which is characterized in that the signal tune
Reason channel includes:
Digital analog converter module, input terminal connect described control unit output end, for acquire the Wave data,
Handle the Wave data and output difference signal；
Operational amplifying module, input terminal connects the output end of the digital analog converter module, for receiving the difference
Signal, the processing Wave data simultaneously export single-ended signal,
Wherein: the bandwidth of the operational amplifying module is equal to the half of the sample rate of the digital analog converter module.
3. the multichannel generator according to claim 2 based on board, which is characterized in that the number mould
Quasi- conversion module includes:
Current-output type digital-to-analogue conversion unit, input terminal connects the output end of described control unit, for acquiring the waveform number
According to, and output difference current signal；
First resistor, one end connect the in-phase output end of the current-output type digital-to-analogue conversion unit, other end ground connection；
Second resistance, one end connect the reversed-phase output of the current-output type digital-to-analogue conversion unit, other end ground connection.
4. the multichannel generator according to claim 3 based on board, which is characterized in that the number mould
Quasi- conversion module further include:
First capacitor, one end connect the in-phase output end of the current-output type digital-to-analogue conversion unit, other end ground connection；
Second capacitor, one end connect the reversed-phase output of the current-output type digital-to-analogue conversion unit, other end ground connection.
5. the multichannel generator according to claim 3 based on board, which is characterized in that the operation is put
Big module includes:
Operation amplifier unit, the non-inverting input terminal of the operation amplifier unit connect the current-output type digital-to-analogue conversion unit
In-phase output end, the reverse phase that the inverting input terminal of the operation amplifier unit connects the current-output type digital-to-analogue conversion unit are defeated
Outlet.
6. the multichannel generator according to claim 5 based on board, which is characterized in that the operation is put
Big module further include:
3rd resistor, one end are connected to the inverting input terminal of the operation amplifier unit, and the other end connects the current-output type
The reversed-phase output of digital-to-analogue conversion unit；
4th resistance, one end are connected to the inverting input terminal of the operation amplifier unit, other end ground connection.
7. the multichannel generator according to claim 5 based on board, which is characterized in that the operation is put
Big module further include:
5th resistance, one end are connected to the output end of the operation amplifier unit, and the other end is connected with connector.
8. the multichannel generator according to claim 7 based on board, which is characterized in that the operation is put
Big module further include:
Third capacitor, one end connect the output end of the operation amplifier unit, other end ground connection by the 5th resistance.
9. the multichannel generator according to claim 6 based on board, which is characterized in that the operation is put
Big module further include:
High-frequency isolation circuit is arranged on the power supply circuit of the operation amplifier unit.
10. the multichannel generator according to claim 2 based on board, which is characterized in that the board
The reference layer hollow out of the input terminal position of the upper operational amplifying module；
The reference layer hollow out of the output end position of the operational amplifying module on the board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822067201.XU CN209086785U (en) | 2018-12-06 | 2018-12-06 | A kind of multichannel generator based on board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822067201.XU CN209086785U (en) | 2018-12-06 | 2018-12-06 | A kind of multichannel generator based on board |
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| Publication Number | Publication Date |
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| CN209086785U true CN209086785U (en) | 2019-07-09 |
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| CN201822067201.XU Active CN209086785U (en) | 2018-12-06 | 2018-12-06 | A kind of multichannel generator based on board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109656307A (en) * | 2018-12-06 | 2019-04-19 | 合肥本源量子计算科技有限责任公司 | A kind of multichannel generator based on board |
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2018
- 2018-12-06 CN CN201822067201.XU patent/CN209086785U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109656307A (en) * | 2018-12-06 | 2019-04-19 | 合肥本源量子计算科技有限责任公司 | A kind of multichannel generator based on board |
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