CN103279045B - A kind of multi-path precise direct current level signal generation device - Google Patents
A kind of multi-path precise direct current level signal generation device Download PDFInfo
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- CN103279045B CN103279045B CN201310193001.8A CN201310193001A CN103279045B CN 103279045 B CN103279045 B CN 103279045B CN 201310193001 A CN201310193001 A CN 201310193001A CN 103279045 B CN103279045 B CN 103279045B
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Abstract
The invention provides a kind of multi-path precise direct current level signal generation device, by a precision DC signal generator, an one tunnel input multiple-channel output selector switch, n signal holding circuit and n isolation buffer circuit, under the control of control module, precision DC signal generator cyclically produces the precision DC level signal needed for n passage successively, then by a road input multiple-channel output selector switch, the precision DC level signal needed for certain passage produced is sent into the signal holding circuit of respective channel, isolation buffer circuit again through respective channel exports to respective functional circuit.Such use precision DC signal generator realizes multiple DC level signal with varying level value and exports, and to reduce costs, reduces space hold.
Description
Technical field
The invention belongs to DC level and produce technical field, more specifically say, relate to a kind of multi-path precise direct current level signal generation device, effectively to realize the generation of the precision DC level signal of the different direct current level values of multichannel.
Background technology
DC level signal is a kind of common signal of electronic applications, is often used to the parameter regulating or control in electronic system.Such as, in signal generator, adopt DC level signal to be multiplied with the waveform signal that will produce, the amplitude being realized waveform signal by the level value changing DC level signal is controlled; And for example, DC level signal and waveform signal is adopted to compare generation square-wave signal, by the duty cycle parameters regulating the level value of DC level signal can change square-wave signal.
Along with the complicacy of electronic system increases, in an electronic system, often need multiple DC level signal with varying level.In order to produce these DC level signals, classic method needs to adopt multiple DC level signal generator, has that cost is high, take up room the shortcoming such as large, as Fig. 1.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of multi-path precise direct current level signal generation device is provided, to reduce costs, reduce space hold.
For realizing above object, multi-path precise direct current level signal generation device of the present invention, is characterized in that, comprising:
One control module, for generation of level controling signal and channel selecting control signal, the wherein precision DC level value of level controling signal needed for n passage cyclically exporting successively, channel selecting control signal is the gating signal of the corresponding passage of certain passage precision DC level value exported with level controling signal;
One precision DC signal generator, for cyclically producing the precision DC level signal needed for n passage successively according to level controling signal;
An one tunnel input multiple-channel output selector switch, for receiving the precision DC level signal that precision DC signal generator produces, then, according to the selector switch of channel selecting control signal gating respective channel, the precision DC level signal of reception is exported to the signal holding circuit of respective channel;
N signal holding circuit, a road of the corresponding multidiameter option switch of input of each signal holding circuit exports, and keeps respectively the precision DC level signal needed for n the passage inputted;
N isolation buffer circuit, export to respective functional circuit after the precision DC level signal kept n signal holding circuit respectively carries out isolation buffer, the functional circuit accessed to prevent each channel DC level signal produces interference to the level of DC level signal.
The object of the present invention is achieved like this:
Multi-path precise direct current level signal generation device of the present invention is by a precision DC signal generator, an one tunnel input multiple-channel output selector switch, n signal holding circuit and n isolation buffer circuit, under the control of control module, precision DC signal generator cyclically produces the precision DC level signal needed for n passage successively, then the precision DC level signal needed for certain passage produced by precision DC signal generator by a road input multiple-channel output selector switch sends into the signal holding circuit of respective channel, isolation buffer circuit again through respective channel exports to respective functional circuit.Such use precision DC signal generator realizes multiple DC level signal with varying level value and exports, and to reduce costs, reduces space hold.
Accompanying drawing explanation
Fig. 1 is a kind of structure principle chart of prior art multi-path precise direct current level signal generation device;
Fig. 2 is a kind of embodiment schematic diagram of multi-path precise direct current level signal generation device of the present invention;
Fig. 3 is multi-path precise direct current level signal generation device workflow diagram of the present invention;
Fig. 4 is the embodiment of signal holding circuit one shown in Fig. 2 schematic diagram;
Fig. 5 is that the signal generator of multi-channel precision direct shown in Fig. 2 exports DC level signal sequential chart;
Fig. 6 is the multichannel road precision DC level signal generation device schematic diagram based on FPGA.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.Requiring particular attention is that, in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these are described in and will be left in the basket here.
Fig. 2 is a kind of embodiment schematic diagram of multi-path precise direct current level signal generation device of the present invention.
In the present embodiment, as shown in Figure 2, multi-path precise direct current level signal generation device of the present invention comprises control module 1, precision DC signal generator 2, tunnel input multiple-channel output selector switch 3, a n signal holding circuit 4 and n isolation buffer circuit 5.
Control module 1 produces level controling signal and channel selecting control signal.Wherein, the precision DC level value of level controling signal needed for n passage cyclically exporting successively, channel selecting control signal is the gating signal of the corresponding passage of certain passage precision DC level value exported with level controling signal.As the precision DC level value of current level control signal needed for the 1st passage, then channel selecting control signal should be the gating signal of gating the 1st passage.
Precision DC signal generator 2 cyclically produces the precision DC level signal A1 ~ An needed for n passage successively according to level controling signal.
The input end Sin of one tunnel input multiple-channel output selector switch 3 connects the output terminal of precision DC signal generator 2, for receiving the precision DC level signal that precision DC signal generator 2 produces, then, according to the selector switch of channel selecting control signal gating one tunnel input multiple-channel output selector switch respective channel, the precision DC level signal of reception is exported to the signal holding circuit of respective channel.As the precision DC level signal A1 of the 1st passage of current generation, then the selector switch of road input multiple-channel output selector switch 3 gating the 1st passage, its output terminal is Sout1.
One tunnel selector switch Sout1 ~ n of the corresponding road output multi-channel output selector switch of input of each signal holding circuit 1 ~ n of n signal holding circuit 4, keeps respectively to the precision DC level signal A1 ~ An needed for n the passage inputted;
Export to respective functional circuit after n isolation buffer circuit 5 carries out isolation buffer to the precision DC level signal A1 ~ An of n signal holding circuit maintenance respectively, the functional circuit accessed to prevent each channel DC level signal produces interference to the level of DC level signal.Wherein CH1 ~ CHn represents each channel output end of multi-path precise direct current level signal generation device.
In the present embodiment, need to produce n passage (be respectively CH1, CH2 ... CHn) precision DC level signal for being respectively A1, A2, A3 ..., An, its workflow specifically produced as shown in Figure 3:
(1), first control module 1 controls the enable signal LE of a road input multiple-channel output selector switch 3, the not enable road that namely turns off inputs multiple-channel output selector switch 3, namely input end Sin is free of attachment to any one output terminal Sout1-Soutn, waits until that on off state is stablized;
(2), control module 1 arranges precision DC signal generator 2 and produces DC level signal Ai needed for i-th channel C hi, waits until the stable output of precision DC signal generator 2, wherein i value in 1-n;
(3), control module 1 input channel selects control signal SEL to select to want a road selector switch of the road input multiple-channel output selector switch corresponding to channel C hi of gating, its output terminal is Souti, control module 1 controls the enable signal LE of a road input multiple-channel output selector switch 3, an enable road input multiple-channel output selector switch 3, the input end Sin made it is connected to the output Souti of respective channel Chi selector switch, waits until that on off state is stablized;
(4), the signal holding circuit of respective channel Chi starts charging process, waits until that charged state is stablized;
(5), under the control of control module 1, repeat step (1)-(4), complete the i-th+1 channel C H
i+1dC level signal arrange, if be switched to last passage, i.e. i+1>n, then i has restarted from 1, so circulates.
In the present embodiment, signal holding circuit as shown in Figure 4, is a RC circuit,
According to the selector switch of channel selecting control signal gating one tunnel input multiple-channel output selector switch 3 respective channel i and an enable road input multiple-channel output selector switch 3 time, charging current is charged to electric capacity C by resistance R, when the voltage on electric capacity C equals the voltage of the precision DC level signal Ai that a road input multiple-channel output selector switch passage i exports, charging process completes, when the selector switch of respective channel i disconnects, because this passage is in high-impedance state, ideally there is not discharge process, the voltage of the precision DC level signal Ai that precision DC signal generator 2 exports before the selector switch always equaling respective channel i disconnects by the level on electric capacity C, until the selector switch gating of this switching channels i next time, carry out next charging process.There is the parameters such as dead resistance in signal holding circuit, there is the process of electric discharge in actual applications, and therefore, the voltage on signal holding circuit can decline, thus the level causing each passage to export precision DC level signal declines.
In the present embodiment, turning off road input multiple-channel output selector switch 3 required time is t1, arranging precision DC signal generator 2 and waiting until that its output precision DC level signal reaches the stable time is t2, the selector switch of gating respective channel enable road input multiple-channel output selector switch 3 required time is t3, in signal holding circuit DC level signal charge from minimum amplitude to maximum amplitude needed for time be t4, then the time T that precision DC signal generator exports the DC level signal of a passage should meet following relational expression:
T＞t
1+t
2+t
3+t
4
Fig. 5 is that precision DC signal generator exports DC level signal sequential chart.LE is the enable signal of a road input multiple-channel output selector switch 3, and when it is low, a road input multiple-channel output selector switch 3 is enabled, and namely a road input multiple-channel output selector switch 3 inputs one of them output port in Sin connection Sout1-Soutn; In the present embodiment, only depict A1, A2, CH1 represents the output of passage 1, and CH2 represents passage 2 and exports.T1 charges to time needed for V1 from zero level for passage 1, and T2 charges to time needed for V2 from zero level for passage 2.The same workflow of its sequential relationship, does not repeat them here.
Suppose to need n DC level signal, then the circulation of precision DC signal generator exports the time of one-period is nT.
There is the parameters such as dead resistance due to signal holding circuit, there is the process of electric discharge in actual applications, declining causing the output voltage of each passage.Supposing that 1 multi-channel output signal decays to the time that can accept within level magnitudes is t5, then the number of active lanes (n gets round numbers downwards) utilizing following relational expression to try to achieve the present invention to support:
Fig. 6 is the multichannel road precision DC level signal generation device schematic diagram based on FPGA.
As shown in Figure 6, control module 1 designs based on FPGA, wherein clock generating module can be produced by crystal oscillator, time block, control signal generation module, each channel levels memory module can have been come by FPGA, reach the accurate control to precision DC signal generator 2, tunnel input multiple-channel output selector switch 3.
Precision DC signal generator 2 requires to export accurate direct current signal, and possesses program-controlled ability, and for reducing the number of control line, the voltage-regulating circuit that high-precision serializable programming DAC and amplifier can be adopted to form realizes.
It is short and have the not enable ability of whole passage that one tunnel input multiple-channel output selector switch 3 needs to have switch stabilization time.
Signal holding circuit 4 also can adopt operational amplifier to form integrator and realize.
Isolation buffer circuit 5 can adopt operational amplifier to form follower and realize.
Although be described the illustrative embodiment of the present invention above; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present invention determined, these changes are apparent, and all innovation and creation utilizing the present invention to conceive are all at the row of protection in appended claim.
Claims (5)
1. a multi-path precise direct current level signal generation device, is characterized in that, comprising:
One control module, for generation of level controling signal and channel selecting control signal, the wherein precision DC level value of level controling signal needed for n passage cyclically exporting successively, channel selecting control signal is the gating signal of the corresponding passage of certain passage precision DC level value exported with level controling signal;
One precision DC signal generator, for cyclically producing the precision DC level signal needed for n passage successively according to level controling signal;
An one tunnel input multiple-channel output selector switch, for receiving the precision DC level signal that precision DC signal generator produces, then, according to the selector switch of channel selecting control signal gating respective channel, the precision DC level signal of reception is exported to the signal holding circuit of respective channel;
N signal holding circuit, a road of the corresponding multidiameter option switch of input of each signal holding circuit exports, and keeps respectively the precision DC level signal needed for n the passage inputted;
N isolation buffer circuit, export to respective functional circuit after the precision DC level signal kept n signal holding circuit respectively carries out isolation buffer, the functional circuit accessed to prevent each channel DC level signal produces interference to the level of DC level signal.
2. multi-path precise direct current level signal generation device according to claim 1, is characterized in that:
First control module controls the enable signal of a road input multiple-channel output selector switch, and the not enable road that namely turns off inputs multiple-channel output selector switch, and namely input end is free of attachment to any one output terminal, waits until that on off state is stablized;
Then, control module arranges the level value Ai that precision DC signal generator produces the DC level signal needed for i-th passage, waits until the stable output of precision DC signal generator, wherein i value in 1-n;
Again, control module output channel selects control signal, select the selector switch wanting the respective channel of gating, its output terminal is Souti, control module controls the enable signal of a road input multiple-channel output selector switch, an enable road input multiple-channel output selector switch, the input end made it is connected to the output Souti of the switch of respective channel, waits until that on off state is stablized;
Finally, the signal holding circuit of respective channel starts charging process, waits until that charged state is stablized;
Under control module controls, repeat said process, complete and arrange the DC level signal of the i-th+1 passage, if be switched to last passage, i.e. i+1>n, then i has restarted from 1, so circulates.
3. multi-path precise direct current level signal generation device according to claim 2, is characterized in that,
The time T that precision DC signal generator exports the DC level signal of a passage should meet following relational expression:
T＞t
1+t
2+t
3+t
4
Wherein, turning off a road input multiple-channel output selector switch required time is t1, arranging precision DC signal generator and waiting until that its output precision DC level signal reaches the stable time is t2, the analog switch of gating respective channel enable multiple-channel output selector switch required time is t3, in signal holding circuit DC level signal charge from minimum amplitude to maximum amplitude needed for time be t4.
4. multi-path precise direct current level signal generation device according to claim 3, is characterized in that, number of active lanes n should meet:
Wherein, t5 is that 1 multi-channel output signal decays to the time that can accept within level magnitudes.
5. multi-path precise direct current level signal generation device according to claim 1, is characterized in that, it is short and have the not enable ability of whole passage that a described road input multiple-channel output selector switch needs to have switch stabilization time;
Isolation buffer circuit can adopt operational amplifier to form follower and realize.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354584A (en) * | 2008-07-29 | 2009-01-28 | 株洲南车时代电气股份有限公司 | Multichannel analog signal generator |
| CN201893696U (en) * | 2010-11-26 | 2011-07-06 | 中国工程物理研究院流体物理研究所 | Multimode compatible level output circuit |
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| KR101096257B1 (en) * | 2009-08-28 | 2011-12-22 | 주식회사 하이닉스반도체 | Temperature Sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354584A (en) * | 2008-07-29 | 2009-01-28 | 株洲南车时代电气股份有限公司 | Multichannel analog signal generator |
| CN201893696U (en) * | 2010-11-26 | 2011-07-06 | 中国工程物理研究院流体物理研究所 | Multimode compatible level output circuit |
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