CN101701971A - High-precision multichannel analog signal source - Google Patents
High-precision multichannel analog signal source Download PDFInfo
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- CN101701971A CN101701971A CN200910075807A CN200910075807A CN101701971A CN 101701971 A CN101701971 A CN 101701971A CN 200910075807 A CN200910075807 A CN 200910075807A CN 200910075807 A CN200910075807 A CN 200910075807A CN 101701971 A CN101701971 A CN 101701971A
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Abstract
The invention relates to the field of electronic tests, in particular to a high-precision multichannel analog signal source which meets the requirement for an analog signal source in the current field of electronic tests. The analog signal source comprises a logic control unit, a memory and a waveform output circuit, wherein the waveform output circuit comprises a D/A converting circuit, a signal conditioning circuit, a multichannel change-over switch and a plurality of paths of analog signal output modules; and a recovery test circuit is arranged between the output end of the waveform output circuit and the logic control unit. The invention can independently output waveform analog signals, such as direct current, rectangular waves, and the like and provide high-precision analog signals in various waveforms for a performance test of a tested device; the output precision of the direct current signal can reach +/-0.0.5 percent FS and the establishing time of the rising edge of the rectangular wave is smaller than 200ns, thereby meeting the requirement during carrying out a channel bandwidth test on high-end electronic products, such as a telemetering programming device and other aerospace telemetering equipment; and the invention also has the advantages of simple and reasonable structure, stable performance and high validity and reliability of the signals.
Description
Technical field
The present invention relates to the Electronic Testing field, specifically is a kind of high-precision multichannel analog signal source.
Background technology
Simulation signal generator is the important component part of hyundai electronics test macro, the for example interior performance test of aerospace field to Aero-Space telemetry equipment-remote measurement sampler and coder, simulation signal generator will provide reliable standard analog signal for the test of remote measurement sampler and coder, is used to test the various performances of remote measurement sampler and coder.High speed development along with electronic device in the high-tech areas such as Aero-Space, electronic instrument is more and more higher to the requirement of the frequency stability of simulation signal generator and accuracy, and problem such as the simulating signal that existing simulation signal generator generates exists that signal kinds is single, the DC quantity signal accuracy is not high, square wave rising edge Time Created is long can not adapt to Electronic Testing field development need.
Summary of the invention
The present invention provides a kind of high-precision multichannel analog signal source in order to satisfy the needs of current Electronic Testing field to simulation signal generator.
The present invention adopts following technical scheme to realize: high-precision multichannel analog signal source, comprise logic control element, be used for the stored waveform memory of data, the waveform output circuit, storer is connected with logic control element, the waveform output circuit comprises the D/A change-over circuit, signal conditioning circuit, be subjected to the hyperchannel change-over switch of logic control element control action, and several simulating signal output module, the input end of D/A change-over circuit and output terminal respectively with logic control element, signal conditioning circuit connects, the input end of hyperchannel change-over switch is connected with the signal conditioning circuit output terminal, and each channel output end of hyperchannel change-over switch is connected through the input end of independent sample holding circuit with the corresponding analog signal output module; Described simulating signal output module is a dual input dual output simulating signal output module, comprises the single output type single-pole double-throw switch (SPDT) of the dual input K that is subjected to the logic control element control action
I-1, and single input dual output formula single-pole double-throw switch (SPDT) K
I-2, and single-pole double-throw switch (SPDT) K
I-1Output terminal and single-pole double-throw switch (SPDT) K
I-2Input end between be provided with signal conditioning circuit, single-pole double-throw switch (SPDT) K
I-2Two output terminal VO
I-1, VO
I-2Between be in series with resistance R i, single-pole double-throw switch (SPDT) K
I-2A wherein output terminal VO
I-1Analog signal output as signal source;
It is single many output types of input hyperchannel change-over switch of two times of simulating signal output module numbers that hyperchannel change-over switch in the waveform output circuit adopts port number, and per two passages of hyperchannel change-over switch are one group, and the output terminal of every group of passage is connected through the input end of independent sample holding circuit with the corresponding analog signal output module respectively;
Be provided with the back production test circuit between the output terminal of waveform output circuit and the logic control element, described back production test circuit comprises the hyperchannel change-over switch that is subjected to the logic control element control action, the signal conditioning circuit that is connected with hyperchannel change-over switch output terminal, and input end and output terminal respectively with signal conditioning circuit, the A/D change-over circuit that logic control element connects, wherein, it is the single output type hyperchannel of the many inputs change-over switch of two times of simulating signal output module numbers that hyperchannel change-over switch in the back production test circuit adopts port number, and per two passages of hyperchannel change-over switch are one group, two output terminal VO of the input end of every group of passage and corresponding analog signal output module
I-1, VO
I-2Connect.Described signal conditioning circuit and sampling hold circuit are existing known circuits, and those skilled in the art can realize in multiple circuit distortion.
After starting simulation signal generator of the present invention, the logic control element of simulation signal generator reads the Wave data of storing in the storer, the timesharing circulation output digital signal corresponding with waveform, and, transfer to corresponding analog signal output module VO through hyperchannel change-over switch and corresponding sampling hold circuit under logic control element control via after the digital-to-analog conversion of D/A change-over circuit, the conditioning of signal condition module
I-1Output, the realization hyperchannel is exported the purpose of multiple waveform modelling signal simultaneously respectively.
Simulation signal generator of the present invention is being realized DC quantity signal, and AC wave shape signals such as sine wave, triangular wave, sawtooth wave when exporting, the single-pole double-throw switch (SPDT) K of simulating signal output module
I-2Under logic control element control, remain its input end and signal source analog signal output VO
I-1Conducting, promptly above-mentioned waveform signal is after keeping through corresponding sampling hold circuit sampling, through single-pole double-throw switch (SPDT) K
I-1, signal conditioning circuit transfers to single-pole double-throw switch (SPDT) K
I-2, by single-pole double-throw switch (SPDT) K
I-2Signal source analog signal output VO
I-1Output is for equipment under test provides required simulating signal;
Especially at DC quantity signal output accuracy problem, the spy sets up DC quantity signal output back production feedback function, promptly by signal source analog signal output VO
I-1The DC quantity signal of output is simultaneously via the hyperchannel change-over switch, the signal condition module, the back production test circuit back production that the A/D change-over circuit constitutes feeds back to logic control element, logic control element compares the former setting value of back production signal and DC quantity signal, the digital signal corresponding with the DC quantity signal to output proofreaied and correct, and application high precision D/A change-over circuit and high-precision signal modulate circuit, eliminate extraneous factor (as temperature) as much as possible and changed the influence that simulating signal source circuit of the present invention is brought, reduce DC quantity simulating signal output error, to improve the precision of simulation signal generator output DC quantity simulating signal of the present invention, guarantee that DC quantity simulating signal output accuracy in ± 0.05%FS, has improved the overall precision of simulation signal generator effectively.
In addition, simulation signal generator of the present invention is when realizing square-wave signal output, logic control element is the output digital signal corresponding with high level and low level in proper order, via the digital-to-analog conversion of D/A change-over circuit, after the conditioning of signal condition module, under logic control element control, belong to the two passages output of same channel group in by the hyperchannel change-over switch, then after the sampling hold circuit sampling keeps, transfer to corresponding simulating signal output module (being square wave simulating signal output module), and switch single-pole double-throw switch (SPDT) K according to generating frequency of rectangular wave by logic control element
I-1, generate the square wave simulating signal, eliminate the overshoot that switch switches generation at a high speed through signal conditioning circuit then, produce smooth waveform rising edge, by single-pole double-throw switch (SPDT) K
I-2Signal source analog signal output VO
I-1Output; With single-pole double-throw switch (SPDT) K
I-1Switch at a high speed and obtain square-wave signal, improved the speed of setting up of square wave waveform rising edge, make Time Created of square wave waveform rising edge less than 200ns, the square-wave signal spectral range can cover 0～5MHz, satisfies the needs when the remote measurement sampler and coder carried out the channel bandwidth test far away.
In addition, but simulation signal generator hyperchannel of the present invention realize simultaneously each equipment under test input impedance R
L-iMeasurement, when measuring, simulation signal generator of the present invention is at first switched and analog signal output VO by logic control element
I-1Single-pole double-throw switch (SPDT) K in the corresponding simulating signal output module
I-2, gating and signal source analog signal output VO
I-1Relative another output terminal VO
I-2(being non-signal source analog signal output); At this moment, the DC quantity simulating signal that simulation signal generator of the present invention provides for equipment under test just is applied on the equipment under test after resistance R i step-down, as shown in Figure 1, and the voltage VO at resistance R i two ends
I-1And VO
I-2Feed back to logic control element by the back production test circuit that constitutes by hyperchannel change-over switch, signal condition module, A/D change-over circuit, according to formula
Conversion obtains the input impedance R of equipment under test
L-iWhen the input impedance of equipment under test is too small, can make the analog waveform output module can't drive load, thereby cause the analog waveform distortion of exporting, so at first carry out testing impedance during waveform output, as the input impedance correct (input impedance of general device is not less than 2 megaohms) of equipment under test, logic control element switches single-pole double-throw switch (SPDT) K
I-2Gating switch K
I-2Signal source analog signal output VO
I-1, via K switch
I-2The analog signal output VO of place simulating signal output module
I-1For equipment under test provides the DC quantity simulating signal, when recording input impedance when too small, logic control element is not then to K switch
I-2Switch, and then play the effect of intelligent protection signal source and equipment under test.Wherein, resistance R i (promptly is series at single-pole double-throw switch (SPDT) K
I-2Resistance R i between two output terminals) is the testing impedance reference resistance.
The present invention is simple and reasonable for structure, be convenient to optimize and improve, stable performance, waveform modelling signals such as the independent output DC quantity of each passage energy, square wave, sine wave, triangular wave, sawtooth wave, the high-precision analog signal of multiple waveform can be provided for the test of equipment under test at aspects such as DC characteristic, AC characteristic, input impedance, channel bandwidth and passage interference, signal validity and reliability are high, DC quantity signal output accuracy can reach ± 0.05%FS, the Time Created of square wave rising edge is less than 200ns, and can test the input impedance of equipment under test; Can be widely used in the electronic device field tests, so that shorten the development and Design cycle of electronic device.
Description of drawings
Fig. 1 is a functional-block diagram of the present invention;
Embodiment
As shown in Figure 1, high-precision multichannel analog signal source, comprise logic control element, be used for the stored waveform memory of data, the waveform output circuit, storer is connected with logic control element, the waveform output circuit comprises the D/A change-over circuit, signal conditioning circuit, be subjected to the hyperchannel change-over switch of logic control element control action, and several simulating signal output module, the input end of D/A change-over circuit and output terminal respectively with logic control element, signal conditioning circuit connects, the input end of hyperchannel change-over switch is connected with the signal conditioning circuit output terminal, and each channel output end of hyperchannel change-over switch is connected through the input end of independent sample holding circuit with the corresponding analog signal output module; Described simulating signal output module is a dual input dual output simulating signal output module, comprises the single output type single-pole double-throw switch (SPDT) of the dual input K that is subjected to the logic control element control action
I-1, and single input dual output formula single-pole double-throw switch (SPDT) K
I-2, and single-pole double-throw switch (SPDT) K
I-1Output terminal and single-pole double-throw switch (SPDT) K
I-2Input end between be provided with signal conditioning circuit, single-pole double-throw switch (SPDT) K
I-2Two output terminal VO
I-1, VO
I-2Between be in series with resistance R i, single-pole double-throw switch (SPDT) K
I-2A wherein output terminal VO
I-1Analog signal output as signal source;
It is single many output types of input hyperchannel change-over switch of two times of simulating signal output module numbers that hyperchannel change-over switch in the waveform output circuit adopts port number, and per two passages of hyperchannel change-over switch are one group, and the output terminal of every group of passage is connected through the input end of independent sample holding circuit with the corresponding analog signal output module respectively;
Be provided with the back production test circuit between the output terminal of waveform output circuit and the logic control element, described back production test circuit comprises the hyperchannel change-over switch that is subjected to the logic control element control action, the signal conditioning circuit that is connected with hyperchannel change-over switch output terminal, and input end and output terminal respectively with signal conditioning circuit, the A/D change-over circuit that logic control element connects, wherein, it is the single output type hyperchannel of the many inputs change-over switch of two times of simulating signal output module numbers that hyperchannel change-over switch in the back production test circuit adopts port number, and per two passages of hyperchannel change-over switch are one group, two output terminal VO of the input end of every group of passage and corresponding analog signal output module
I-1, VO
I-2Connect.
During concrete enforcement, the LVDS transport module that is connected with logic control element can be set, and main control module and backboard LVDS bus be set, logic control element is communicated by letter with main control module through backboard LVDS bus by the LVDS transport module, realize order and exchanges data between logic control element and the main control module, make logic control element receive the quantized waveform data that the main control module transmission comes, and store in the high capacity wave memorizer, call for logic control element, so that logic control element control waveform output circuit generates corresponding simulating signal.Wherein, main control module can link to each other with host computer by usb bus, realizes the able to programme in real time of the real-time download of Wave data and signal source.
As shown in Figure 1, high-precision multichannel analog signal source of the present invention can provide 32 tunnel simulating signals for equipment under test.The components and parts of high-precision multichannel analog signal source of the present invention are selected as follows: logic control element adopts the Spartan-IIE series programmable logic device (PLD) of Xilinx company; The D/A conversion chip is selected 16 D/A converter AD768 of ANALOG company; The A/D conversion chip is selected 16 of ANALOG company, the AD7667 of 1MSPS, and the 2.5V reference voltage temperature drift of its output reaches 3ppm/ ℃, can provide high precision reference voltage for D/A conversion output; When realizing square-wave signal, the single-pole double-throw switch (SPDT) K of application
I-1And K
I-2Adopt four road SPDT switch ADG333A, its conducting t switching time
On＜175ns.
Claims (1)
1. high-precision multichannel analog signal source, comprise logic control element, be used for the stored waveform memory of data, the waveform output circuit, storer is connected with logic control element, the waveform output circuit comprises the D/A change-over circuit, signal conditioning circuit, be subjected to the hyperchannel change-over switch of logic control element control action, and several simulating signal output module, the input end of D/A change-over circuit and output terminal respectively with logic control element, signal conditioning circuit connects, the input end of hyperchannel change-over switch is connected with the signal conditioning circuit output terminal, and each channel output end of hyperchannel change-over switch is connected through the input end of independent sample holding circuit with the corresponding analog signal output module; It is characterized in that: described simulating signal output module is a dual input dual output simulating signal output module, comprises the single output type single-pole double-throw switch (SPDT) of the dual input K that is subjected to the logic control element control action
I-1, and single input dual output formula single-pole double-throw switch (SPDT) K
I-2, and single-pole double-throw switch (SPDT) K
I-1Output terminal and single-pole double-throw switch (SPDT) K
I-2Input end between be provided with signal conditioning circuit, single-pole double-throw switch (SPDT) K
I-2Two output terminal VO
I-1, VO
I-2Between be in series with resistance R i, single-pole double-throw switch (SPDT) K
I-2A wherein output terminal VO
I-1Analog signal output as signal source; It is single many output types of input hyperchannel change-over switch of two times of simulating signal output module numbers that hyperchannel change-over switch in the waveform output circuit adopts port number, and per two passages of hyperchannel change-over switch are one group, and the output terminal of every group of passage is connected through the input end of independent sample holding circuit with the corresponding analog signal output module respectively;
Be provided with the back production test circuit between the output terminal of waveform output circuit and the logic control element, described back production test circuit comprises the hyperchannel change-over switch that is subjected to the logic control element control action, the signal conditioning circuit that is connected with hyperchannel change-over switch output terminal, and input end and output terminal respectively with signal conditioning circuit, the A/D change-over circuit that logic control element connects, wherein, it is the single output type hyperchannel of the many inputs change-over switch of two times of simulating signal output module numbers that hyperchannel change-over switch in the back production test circuit adopts port number, and per two passages of hyperchannel change-over switch are one group, two output terminal VO of the input end of every group of passage and corresponding analog signal output module
I-1, VO
I-2Connect.
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| CN2009100758070A CN101701971B (en) | 2009-10-24 | 2009-10-24 | High-precision multichannel analog signal source |
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| CN2009100758070A CN101701971B (en) | 2009-10-24 | 2009-10-24 | High-precision multichannel analog signal source |
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| CN101701971B CN101701971B (en) | 2011-09-21 |
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Inventor after: Zhen Guoyong Inventor after: Shan Yanhu Inventor after: Ren Yongfeng Inventor after: Zhang Wendong Inventor after: Su Shujing Inventor after: Jiao Xinquan Inventor after: Li Shengkun Inventor after: Zhao Chengkai Inventor after: Zhao Dongqing Inventor before: Ren Yongfeng Inventor before: Shan Yanhu Inventor before: Zhen Guoyong Inventor before: Zhang Wendong Inventor before: Su Shujing Inventor before: Jiao Xinquan Inventor before: Li Shengkun Inventor before: Zhao Chengkai Inventor before: Zhao Dongqing |
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Free format text: CORRECT: INVENTOR; FROM: REN YONGFENG DAN YANHU ZHEN GUOYONG ZHANG WENDONG SU SHUJING JIAO XINQUAN LI SHENGKUN ZHAO CHENGKAI ZHAO DONGQING TO: ZHEN GUOYONG DAN YANHU REN YONGFENG ZHANG WENDONG SU SHUJING JIAO XINQUAN LI SHENGKUN ZHAO CHENGKAI ZHAO DONGQING |
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Granted publication date: 20110921 Termination date: 20211024 |
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