CN101231344A - Signal peak value sampling holding device and application thereof in nuclear energy spectrometry system - Google Patents
Signal peak value sampling holding device and application thereof in nuclear energy spectrometry system Download PDFInfo
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- CN101231344A CN101231344A CNA2008100706423A CN200810070642A CN101231344A CN 101231344 A CN101231344 A CN 101231344A CN A2008100706423 A CNA2008100706423 A CN A2008100706423A CN 200810070642 A CN200810070642 A CN 200810070642A CN 101231344 A CN101231344 A CN 101231344A
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Abstract
The invention relates to a peak value sampling and holding device for a nuclear spectrum measurement system, comprising a front buffer circuit, a sampling and holding circuit and an output buffer circuit that are sequentially connected. The front buffer circuit is used for receiving an upper peak signal and outputting the signal further modulated by the peak value sampling and holding device to a lower receiving circuit. The sampling and holding circuit has two analog switches U3A and U3B, a diode D3, and a capacitor C1. When the analog switches U3A and U3B are separately or simultaneously switched off, the controllability of the peak value sampling and holding device can be further improved. The invention solves the problems of the prior peak value sampling and holding device, including low sensitivity, large error, low sampling speed and poor controllability so as to effectively improve the performance of the sampling and holding device in the nuclear spectrum measurement system and further improve the performance of the nuclear spectrum measurement system at the same time.
Description
Technical field
The present invention relates to a kind of signal peak sampling holding device, is a kind of peak value sampling holding device and application thereof that is applicable to the nuclear spectrum measurement system specifically.
Background technology
In the nuclear spectrum measurement system, the signal of detector output is exported the Gauss pulse signal that is as the criterion behind signal conditioning circuit, and signal peak has been represented the feature of radioactive ray, by crest voltage is carried out analog to digital conversion, can realize radioactive measurement.In order to make quantizing peak value exactly of analog to digital conversion circuit, it must be stable requiring the voltage signal of input in transfer process, therefore designing usually before analog to digital conversion circuit has the peak value sampling holding device, keeps crest voltage and remain unchanged in transfer process.Carry out the research and development that the peak value sampling holding device is used in the nuclear spectrum measurement system, realize radiation is analyzed rapidly and accurately, can satisfy the real needs of nuclear spectrum measurement.
The peak value sampling holding device of present nuclear spectrum measurement system convention, form by the detection of diode peak value and electric capacity sampling, maintenance and discharge loop, this device exists problems such as sensitivity is low, error is big, sample rate is slow, poor controllability, and sensitivity, precision and the sample rate that how to improve the peak value sampling holding device is the focus and research difficult point of this type systematic always.
Summary of the invention
Problems such as sensitivity that the conventional peak sampling holding device brings is low, error is big, sample rate is slow in order to overcome, poor controllability, improve the performance of nuclear spectrum measurement system, the invention provides a kind of novel peak value sampling holding device, the signal peak sampling that can be effectively applied to the nuclear spectrum measurement system keeps.
For realizing that the technical scheme that target of the present invention adopts is: the peak value sampling holding device is made up of front buffer circuit, sampling hold circuit, output buffer.Front buffer circuit, sampling hold circuit, output buffer are linked in sequence, the front buffer circuit receives upper peak signal, output signal as the nuclear spectrum measurement system, output buffer will be exported to the next receiving circuit through the signal that the peak value sampling holding device is further nursed one's health, as analog to digital conversion circuit.
Sampling hold circuit has two analog switch U3A, U3B, a diode D3, a capacitor C 1.
The front buffer circuit has integrated operational amplifier U1, diode D1, diode D2, diode D4, resistance R 1.The pin of described integrated operational amplifier U1 connects input signal, another pin is connected with anode, the negative electrode of diode D4, the resistance R 1 of diode D1 respectively, and the 3rd pin links to each other with the pin of analog switch U3A, the anode of diode D2, the negative electrode of D4, the pin of analog switch U3B respectively.
Output buffer has integrated operational amplifier U2, diode D3, capacitor C 1.The pin of described integrated operational amplifier U2 is connected with a pin, the negative electrode of diode D3, the capacitor C 1 of U3A respectively; Another pin of U2 is connected with the end of the 3rd pin of U2, R1 respectively and as output terminal.
Another pin of U3B connects sampling control signal in the sampling hold circuit; Another pin of U3A connects reseting controling signal.
In the application in the nuclear spectrum measurement system, when the analog switch U3A in the sampling hold circuit, analog switch U3B disconnect separately or disconnect simultaneously, can further improve the controllability of peak value sampling holding device in the nuclear spectrum measurement system.U3A is in closure state when analog switch, when analog switch U3B is in off-state, the peak value sampling holding device is in sample states, front buffer circuit, sampling hold circuit, output buffer have constituted the close loop negative feedback amplifying circuit at this moment, the voltage of output is accurately followed input voltage to maximal value, has overcome because the problem that sensitivity is low, error is big that the pressure drop of detector diode causes.When two analog switches all are in off-state, the peak value sampling holding device is in hold mode, and the voltage of output buffer output remains unchanged, the influence that not changed by input voltage, the front buffer circuit is still gone into magnifying state, avoids the error that produces impact signal and cause.When analog switch U3B is in closure state, and analog switch U3A is when being in off-state, front buffer circuit, sampling hold circuit, output buffer have constituted the close loop negative feedback amplifying circuit, the voltage of output is followed input voltage fast and is changed, at this moment, reset to electric capacity, shortened electric capacity reset time, also improved sample rate simultaneously.By the closure of two analog switches and the control of disconnection, further improved the controllability of peak value sampling holding device.
The course of work is: at the rising edge of input signal, behind the front buffer circuit, be the electric capacity charging, reach crest voltage up to input signal, export analog to digital conversion circuit to through output buffer again, at this moment, the startup analog to digital conversion circuit carries out peak value and quantizes to close sample circuit simultaneously, and promptly the peak value sampling holding device withdraws from sample states and enters hold mode; At the negative edge of input signal, because diode is anti-inclined to one side, the voltage that keeps on the electric capacity still is the peak value of input signal.After analog to digital conversion circuit converted, the peak value sampling holding device entered reset mode, up to the rising edge of next input signal.
The invention has the beneficial effects as follows: the sensitivity that has solved the conventional peak sampling holding device is low, error is big, sample rate is slow, the problem of poor controllability.Improve the performance of sampling holding device in the nuclear spectrum measurement system, also improved the performance of nuclear spectrum measurement system simultaneously.
Description of drawings
Fig. 1 be show peak value sampling holding device of the present invention respectively with the connection diagram of detector, analog to digital conversion circuit.
Fig. 2 is a peak value sampling holding device circuit design drawing of the present invention.
Embodiment:
The invention will be further described below in conjunction with drawings and Examples.
The detector that shown in Figure 1 is in peak value sampling holding device and the nuclear spectrum measurement system and receive conventional syndeton between the analog to digital conversion circuit of the stable voltage signal of exporting through this device.
Shown in Figure 2,3 pin of integrated operational amplifier U1 connect input signal, i.e. the accurate Gauss pulse signal of the output of the detector in the described nuclear spectrum measurement of Fig. 1 system; 2 pin of integrated operational amplifier U1 are connected with anode, the negative electrode of diode D4, the resistance R 1 of diode D1 respectively; 6 pin of integrated operational amplifier U1 link to each other with 1 pin of analog switch U3A, the anode of diode D2, the negative electrode of diode D4,11 pin of analog switch U3B respectively.3 pin of integrated operational amplifier U2 are connected with 2 pin, the negative electrode of diode D3, the capacitor C 1 of analog switch U3A respectively; 2 pin of integrated operational amplifier U2 are connected as the output signal that can supply analog to digital conversion circuit to receive with 6 pin of integrated operational amplifier U2, an end of resistance R 1 respectively.10 pin of analog switch U3B are connected with the anode of D3; 12 pin of analog switch U3B connect sampling control signal.13 pin of U3A connect reseting controling signal.
The circuit of labor Fig. 2 is not difficult to infer, when analog switch U3A, analog switch U3B disconnect separately or disconnect simultaneously, can further improve the controllability of peak value sampling holding device.
Claims (8)
1. signal peak sampling holding device and the application in the nuclear spectrum measurement system thereof are made up of front buffer circuit, sampling hold circuit, output buffer, and front buffer circuit, sampling hold circuit, output buffer are linked in sequence, and it is characterized in that:
1) the front buffer circuit by have integrated operational amplifier U1, diode D1, diode D2, diode D4, resistance R 1 constitutes, and can receive upper peak signal;
2) sampling hold circuit is by analog switch U3A, analog switch U3B, and a diode, an electric capacity is formed;
3) output buffer has integrated operational amplifier U2, diode D3, capacitor C 1, exports to the next receiving circuit through the signal of output buffer conditioning.
2. according to the described a kind of peak value sampling holding device that is applicable to the nuclear spectrum measurement system of claim 1, it is characterized in that 3 pin of integrated operational amplifier U1 in the described front buffer circuit connect upper input signal; 2 pin of U1 are connected with anode, the negative electrode of diode D4, the resistance R 1 of diode D1 respectively; 6 pin of U1 link to each other with 1 pin of analog switch U3A, the anode of diode D2, the negative electrode of D4,11 pin of analog switch U3B respectively.
3. according to the described a kind of peak value sampling holding device that is applicable to the nuclear spectrum measurement system of claim 1, it is characterized in that 3 pin of the integrated operational amplifier U2 in the described output buffer are connected with 2 pin, the negative electrode of diode D3, the capacitor C 1 of U3A respectively; 2 pin of U2 are connected as output with 6 pin of U2, the end of R1 respectively; 10 pin of U3B are connected with the anode of D3.
4. according to the described a kind of peak value sampling holding device that is applicable to the nuclear spectrum measurement system of claim 1, it is characterized in that 12 pin of U3B in the described sampling hold circuit connect sampling control signal, 13 pin of U3A connect reseting controling signal.
5. signal peak sampling holding device and the application in the nuclear spectrum measurement system thereof, it is characterized in that in the application in the nuclear spectrum measurement system, when analog switch U3A, analog switch U3B disconnect separately or disconnect simultaneously in the sampling hold circuit, can further improve the controllability of peak value sampling holding device in the nuclear spectrum measurement system.
6. according to described signal peak sampling holding device of claim 5 and the application in the nuclear spectrum measurement system thereof, it is characterized in that analog switch U3A is in closure state in the described sampling hold circuit, when analog switch U3B is in off-state, the peak value sampling holding device is in sample states, and front buffer circuit, sampling hold circuit, output buffer have constituted the close loop negative feedback amplifying circuit at this moment.
7. according to described signal peak sampling holding device of claim 5 and the application in the nuclear spectrum measurement system thereof, when it is characterized in that analog switch U3B is in closure state in the described sampling hold circuit, and analog switch U3A is when being in off-state, and front buffer circuit, sampling hold circuit, output buffer have constituted the close loop negative feedback amplifying circuit.
8. according to described signal peak sampling holding device of claim 5 and the application in the nuclear spectrum measurement system thereof, it is characterized in that two analog switches all are in off-state in the described sampling hold circuit, the peak value sampling holding device is in hold mode, the voltage of output buffer output remains unchanged, the influence that not changed by input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100706423A CN101231344A (en) | 2008-02-20 | 2008-02-20 | Signal peak value sampling holding device and application thereof in nuclear energy spectrometry system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100706423A CN101231344A (en) | 2008-02-20 | 2008-02-20 | Signal peak value sampling holding device and application thereof in nuclear energy spectrometry system |
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| CN101231344A true CN101231344A (en) | 2008-07-30 |
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| CNA2008100706423A Pending CN101231344A (en) | 2008-02-20 | 2008-02-20 | Signal peak value sampling holding device and application thereof in nuclear energy spectrometry system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806916A (en) * | 2010-04-14 | 2010-08-18 | 成都理工大学 | Parallel amplitude analyzer of monocrystal multi-power spectrum |
| CN101852861A (en) * | 2010-04-09 | 2010-10-06 | 罗康林 | Multichannel pulse size analyzer based on peak sensing |
| CN102394570A (en) * | 2011-10-26 | 2012-03-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Monolithic integrated narrow pulse peak holding circuit |
| CN101615432B (en) * | 2009-07-29 | 2012-04-11 | 杭州士兰微电子股份有限公司 | Peak sampling hold circuit, peak sampling hold method and application |
| CN104422812A (en) * | 2013-09-06 | 2015-03-18 | 中国科学院沈阳自动化研究所 | Extreme value sampling circuit |
| CN107707260A (en) * | 2017-11-27 | 2018-02-16 | 中山路得斯空调有限公司 | A kind of instantaneous sampling holding circuit for low speed ADC |
| CN110673190A (en) * | 2019-09-06 | 2020-01-10 | 宁波大学 | Simple SiPM PET imaging system interface circuit |
-
2008
- 2008-02-20 CN CNA2008100706423A patent/CN101231344A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615432B (en) * | 2009-07-29 | 2012-04-11 | 杭州士兰微电子股份有限公司 | Peak sampling hold circuit, peak sampling hold method and application |
| CN101852861A (en) * | 2010-04-09 | 2010-10-06 | 罗康林 | Multichannel pulse size analyzer based on peak sensing |
| CN101806916A (en) * | 2010-04-14 | 2010-08-18 | 成都理工大学 | Parallel amplitude analyzer of monocrystal multi-power spectrum |
| CN102394570A (en) * | 2011-10-26 | 2012-03-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Monolithic integrated narrow pulse peak holding circuit |
| CN102394570B (en) * | 2011-10-26 | 2013-09-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Monolithic integrated narrow pulse peak holding circuit |
| CN104422812A (en) * | 2013-09-06 | 2015-03-18 | 中国科学院沈阳自动化研究所 | Extreme value sampling circuit |
| CN107707260A (en) * | 2017-11-27 | 2018-02-16 | 中山路得斯空调有限公司 | A kind of instantaneous sampling holding circuit for low speed ADC |
| CN110673190A (en) * | 2019-09-06 | 2020-01-10 | 宁波大学 | Simple SiPM PET imaging system interface circuit |
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Open date: 20080730 |