CN102520238A - Intelligent programmable-control microcurrent measurement display system - Google Patents
Intelligent programmable-control microcurrent measurement display system Download PDFInfo
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- CN102520238A CN102520238A CN2011104369914A CN201110436991A CN102520238A CN 102520238 A CN102520238 A CN 102520238A CN 2011104369914 A CN2011104369914 A CN 2011104369914A CN 201110436991 A CN201110436991 A CN 201110436991A CN 102520238 A CN102520238 A CN 102520238A
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Abstract
The invention discloses an intelligent programmable-control microcurrent measurement display system, which is characterized by comprising a computer control module, a display module, a communication module, an A/D (analog/digital) conversion module, a microcurrent measurement system programmable control module, a programmable-control current signal amplifying module and a programmable-control filter module. Microcurrent signals to be measured are input to the programmable-control current signal amplifying module, are amplified and then converted into voltage signals, the voltage signals are input to the programmable-control filter module so as to be filtered, the filtered signals are input to the display module through the A/D conversion module and the communication module so as to be displayed, the programmable-control current signal amplifying module, the programmable-control filter module and the A/D conversion module are controlled by the microcurrent measurement system programmable control module, and the computer control module controls the microcurrent measurement system programmable control module through the communication module. The intelligent programmable microcurrent measurement display system is low in manufacturing cost, higher in adaptability and lowered in price resistance to scientific research.
Description
Technical field
the invention belongs to the defects of semiconductor device field of detecting, are specifically related to a kind of program-controlled intelligent micro current display system.
Background technology
In
current electronic circuit, occupy leading with semiconductor devices.No matter to single MOS device or to VLSI (very large scale integrated circuits), the monitoring that wherein all kinds of Weak currents is changed has become current in order to probe into a kind of approach of device function and defective and stability.With regard to single MOS transistor or special mos capacitance device, this always produces unavoidable defective device in design and production run.Simultaneously, some characteristic of microelectronic material itself also possibly cause device certain performance degradation, problems such as parameter drift when work, to occur.For this type phenomenon, at present the general using pulse voltage is carried out charge-discharge test to device, and the little electric current that causes because of defective when device is discharged and recharged is measured, and its performance and reliability are carried out analysis and evaluation.The present invention amplifies after the instrument research one type of current little electric current, finds that existing one type of little electric current amplifies instrument and has following some shortcomings:
1. instrument itself involve great expense, thereby the general applicability of instrument will reduce the expensive resistance that can increase scientific research greatly.
Often function is single relatively for
this quasi-instrument, also needs signal generator and large-scale instruments such as external oscillograph to cooperate and forms measuring system, has increased the probability that experiment difficulty and accidental error occur, and has reduced the reliability of experimental result.
this quasi-instrument is often mostly to be manual button settings parameter in kind, causes the instrument loss easily, also can reduce testing efficiency.
Summary of the invention
the present invention seeks to: a kind of systemic intelligent measuring systems to little current signal is provided; Realize the robotization of whole electronic measurement system, high precision int, real-time through computing machine and data communication technology; Repeatability, and high efficiency.Make the Weak current signal under the high frequency detection can accurately be amplified and convert into voltage signal; Through after the Filtering Processing; Transmit signals to the waveform display digit software on the computing machine by digital circuit again, whole process also has high sensitivity, the low characteristics that postpone.Wherein, adjusting of gain amplifier and filtering parameter and display mode must be accomplished by computer program-control.
technical scheme of the present invention is: a kind of program-controlled intelligent micro current display system; It is characterized in that; Comprise: computer control module, display module, communication module, A/D modular converter, micro current system program control module, program-controlled current signal amplification module and program-controlled filtration module; Treat that the micrometer current signal imports said program-controlled current signal amplification module; Accomplish to amplify the back and transfer voltage signal to and import program-controlled filtration module and carry out filtering; Filtered signal is input to display module through A/D modular converter and communication module and shows; Said program-controlled current signal amplification module, program-controlled filtration module and A/D modular converter are by the program control module control of micro current system, and said computer control module is through communication module control micro current system program control module.
are further; Said program-controlled current signal amplification module comprises amplifier, zeroing circuit and T-shape resistor network and analog switching circuit thereof; Said zeroing circuit links to each other with the amplifier normal phase input end; T-shape resistor network and analog switching circuit thereof are connected between amplifier negative-phase input and the amplifier out, micro current system program control module control T-shape resistor network and analog switching circuit thereof.
are further, and said program-controlled filtration module comprises, analog switching circuit, rejection filter and BPF., and micro current system program control module is through analog switching circuit control rejection filter and BPF..
are further, and high pass shellfish match mode filter and low pass shellfish match mode filter that said BPF. is set up by the single power supply rail-to-rail operation amplifier are formed.
are further, and the core digital signal processor of said micro current system program control module is FPGA.
are further, and the interface of said communication module is the RS232 communication interface.
are for the existing micro current instrument of tradition; Advantage part of the present invention is: the cost of this measuring system instrument own is low-cost; Thereby the general applicability of instrument will promote greatly, and low cost can reduce the resistance of price to scientific research.Simultaneously, this measuring system complete function, the gain amplifier adjustable extent is wide, and the filtration module precision is high; And have the analog digital translation function, and realized computer aided measurement, and external oscillograph can be used simultaneously, under the reference of two kinds of display modes, promoted measuring reliability.In addition, this instrument is the direct program control measuring system of computing machine, need not manual adjustments, regulates accurate and efficient.
Advantage of the present invention is:
are the gain-adjusted of micro current amplifier 1., and the bandwidth control of rejection filter and BPF. all can directly be provided with on computer screen, has promoted the efficient and the repeatability of systematic survey greatly.Reduced the device loss that causes because of instrument adjusting in kind simultaneously.
than the common current amplifier, and T-shape circuit structure of the present invention has not only reached Noise Control but also can regulate on a large scale and regulate among a small circle gain, and overall amplification range can be from 10 5 powers doubly to 10 9 powers doubly.
native system is in the process of later stage PCB design; All chips that can will be referred to according to the relative theory layout on same pcb board; Reduce artificial link of manually taking circuit certainly, reduced the probability of occurrence of accidental error, guaranteed the precision of experimental result.Simultaneously also guarantee is provided for measuring system portable.
The amplifier that
the present invention possibly exist when handling for the mimic channel small-signal can't accurately be judged the problem near the signal of reference voltage (ground voltage); Adopted in the active power filtering process; Use the rail-to-rail amplifier of single power supply technology; Raise reference voltage, make amplifier can accurately judge signal magnitude, reduced the amplifier output error.
The existing simulating signal of
the present invention is measured output terminal; Digital signal output end is arranged again; Guaranteed in the experimentation like this; Can the result on result in the computing machine display module and the external oscillograph be compared, thereby ensured the validity of experimental data, improved the degree of reliability of system.
native system provides 50 hertz of program-controlled selections or 60 hertz of rejection filters, and this makes the raising of system's anti-line frequency interference capability scope, and the adaptability of this measuring system in the power supply area of different frequency has been described.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Fig. 1 is a program-controlled intelligent micro current display system architectures block diagram of the present invention.
Fig. 2 is a program-controlled intelligent micro current display system architectures block diagram of the present invention.
Fig. 3 is a program-controlled intelligent micro current display system workflow diagram of the present invention.
Embodiment
embodiment: by ASH, digital signal processing and computer user interface three parts are formed like Fig. 1, program-controlled intelligent micro current display system shown in Figure 2.Program-controlled current signal amplification module and program-controlled filtration module can be directly by computer control module controls through micro current system program control module, and ASH also can provide data with display waveform via the RS232 interface in the communication module to the computing machine display module through analog/digital (A/D) modular converter after finishing.The direct control signal of program-controlled current signal amplification module derives from micro treatment module, treats that the micrometer current signal introduces module by coaxial cable, accomplishes to amplify the back and also transfers voltage signal to and import program-controlled filtration module.The direct control signal of program-controlled filtration module derives from micro current system program control module, and filtration module is connected the amplification module delivery outlet by printed circuit board (PCB) (PCB) layout principle, and the voltage signal after amplifying is carried out Filtering Processing.Above-mentioned module all is printed on the same circuit board according to printed circuit board (PCB) (PCB) layout principle; And leave signal input end; The measuring-signal digital output end, measured signal analog input end and measuring-signal analog output, thereby the robotization of realization whole measuring process.UI Preferences in the computer control module on the computer screen has the button of regulating program-controlled current signal amplification module gain amplifier.T-shape resistor network and analog switching circuit thereof are directly controlled the gating path by micro current system program control module and are reached the selected of gain in the program-controlled current signal amplification module.UI Preferences in the computer control module on the computer screen has the button of selecting this measuring system to be used regional ac-powered frequency (50 hertz or 60 hertz).UI Preferences in the computer control module on the computer screen has the button of selecting the logical cutoff frequency scope of band in the program-controlled filtration module.Analog switching circuit in the program-controlled filtration module is directly controlled the setting that the gating path reaches bandreject filtering frequency and the logical cutoff frequency of band by micro current system program control module.BPF. is set up by the single power supply rail-to-rail operation amplifier in the program-controlled filtration module high pass shellfish match mode filter and low pass shellfish match mode filter make up completion jointly.UI Preferences in the computer control module on the computer screen has the button of selection measuring-signal (measuring-signal digital output end or measuring-signal analog output) output interface.
During
duty, the user utilizes Control Software (a kind of C& that utilizes that installs on computers after accomplishing system initialization and electric power starting; The Control Software that C++ writes), selects the correlation parameter button, at first send ASC II code instruction to micro current system program control module through a communication module based on the RS232 interface as operation interface.Choosing by FPGA as the micro current system program control module of core digital signal processor with the switching signal level to reach the identification of micro treatment module to computer instruction.And then micro current system program control module is sent control signal to the analog switching circuit of being controlled.This analog switching circuit is the amplification module controlled by micro current system program control module and the part of filtration module, has therefore played the purpose of program control signal control analog module.After according to certain gating switch assembly, the circuit function of current signal amplification module and current signal filtration module can confirm that characteristic can be confirmed.Only computer regulating instruction is next time sent, and the analog module parameter just can correspondingly be adjusted once more.After the user sets end, put into testing sample, testing sample is applied pulse voltage, generate and treat the micrometer current signal by the outer signal generator.Little current signal gets into the measured signal analog input end, will the flow through path set and amplify and change into voltage signal by corresponding requirement of signal.Voltage signal gets into program-controlled filtration module, accomplishes filtering according to related setting.The artificial circuit part end-of-job.After ASH finishes; If do not open the computing machine display module but directly use external oscillograph; The Enable Pin of the A/D chip in the A/D translation function will be set at high level at this moment; Make the input end of A/D modular converter become high-impedance state, promptly do not start analog digital (A/D) modular converter.This sets equally as previously mentioned, with the selection key that is designed with on the computer control software.On the other hand, signal can directly draw and be presented on the external oscillograph from the measuring-signal analog output.Do not having the down auxiliary of external display instrument, needing to start the computing machine display module.Wherein virtual instrument applied software development instrument LabVIEW may be utilized, and it is a kind of technological virtual development software of being released by the exploitation of American National instrument company of employing graphic programming.The simulating signal that filtering is accomplished gets into the A/D modular converter.A/D chip in the A/D modular converter need have the reference voltage reference; And A/D clock signal chip port connects micro current system program control module; The A/D chip is accomplished the A/D conversion under the low level situation of Enable Pin simultaneously, the binary digital signal of a serial of output.The serial ports that this serial digital signal continues in the input communication module is regulated the chip input end, assisting down of micro current system program control module, realizes the signal level conversion, and passes computing machine back by the RS232 communication interface.Utilize the demonstration of the Virtual Instrument Development software realization waveform in the computing machine display module at last.
are as shown in Figure 3, and program-controlled intelligent micro current of the present invention and display system measuring method flow process are set forth the measuring process of one whole set by step.Initial start, behind connected system and other instruments, the setting measurement function, and then put into testing sample, and test, realize at last amplifying, filtering shows.
above embodiment is merely the present invention's a kind of embodiment wherein, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with accompanying claims.
Claims (6)
1. program-controlled intelligent micro current display system; It is characterized in that; Comprise: computer control module, display module, communication module, A/D modular converter, micro current system program control module, program-controlled current signal amplification module and program-controlled filtration module; Treat that the micrometer current signal imports said program-controlled current signal amplification module; Accomplish to amplify the back and transfer voltage signal to and import program-controlled filtration module and carry out filtering; Filtered signal is input to display module through A/D modular converter and communication module and shows, said program-controlled current signal amplification module, program-controlled filtration module and A/D modular converter are by the program control module control of micro current system, and said computer control module is through communication module control micro current system program control module.
2. program-controlled intelligent micro current display system according to claim 1; It is characterized in that; Said program-controlled current signal amplification module comprises amplifier, zeroing circuit and T-shape resistor network and analog switching circuit thereof; Said zeroing circuit links to each other with the amplifier normal phase input end; T-shape resistor network and analog switching circuit thereof are connected between amplifier negative-phase input and the amplifier out, micro current system program control module control T-shape resistor network and analog switching circuit thereof.
3. program-controlled intelligent micro current display system according to claim 1; It is characterized in that; Said program-controlled filtration module comprises; Analog switching circuit, rejection filter and BPF., micro current system program control module is through analog switching circuit control rejection filter and BPF..
4. program-controlled intelligent micro current display system according to claim 3 is characterized in that, high pass shellfish match mode filter and low pass shellfish match mode filter that said BPF. is set up by the single power supply rail-to-rail operation amplifier are formed.
5. program-controlled intelligent micro current display system according to claim 1 is characterized in that, the core digital signal processor of said micro current system program control module is FPGA.
6. program-controlled intelligent micro current display system according to claim 1 is characterized in that the interface of said communication module is the RS232 communication interface.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865436A (en) * | 2015-04-23 | 2015-08-26 | 西安爱生技术集团公司 | Self-adaptive multi-gear unmanned plane airborne current measurer with program control interface |
| CN106713703A (en) * | 2017-02-17 | 2017-05-24 | 深圳东昇射频技术有限公司 | Amplification system and amplification method for video output signal of radio frequency power probe |
| CN113049869A (en) * | 2021-03-12 | 2021-06-29 | 中国原子能科学研究院 | Circuit for current measurement and radiation intensity measurement system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106713703B (en) * | 2017-02-17 | 2019-09-03 | 深圳东昇射频技术有限公司 | A kind of radio-frequency power probe video output signals amplification system and amplification method |
| CN113049869A (en) * | 2021-03-12 | 2021-06-29 | 中国原子能科学研究院 | Circuit for current measurement and radiation intensity measurement system |
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Application publication date: 20120627 |