CN104158499A - Nuclear electronic experiment system amplification circuit - Google Patents
Nuclear electronic experiment system amplification circuit Download PDFInfo
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- CN104158499A CN104158499A CN201410429954.4A CN201410429954A CN104158499A CN 104158499 A CN104158499 A CN 104158499A CN 201410429954 A CN201410429954 A CN 201410429954A CN 104158499 A CN104158499 A CN 104158499A
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- filter circuit
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Abstract
The invention discloses a nuclear electronic experiment system amplification circuit which comprises a charge sense amplifier and a main linear amplification circuit. The nuclear electronic experiment system amplification circuit is characterized in that a CA3140 chip U1 is used in the front charge sense amplifier, and the main linear amplification circuit is composed of a differential forming circuit, a primary amplification circuit, an integral forming circuit, a secondary amplification circuit and a base line restoring circuit. The differential forming circuit is composed of a passive RC filter circuit U4 with switch control, a direction selection circuit U5, an operational amplifier U1 and an RC integral circuit U3. The primary amplification circuit is composed of an amplitude limiting circuit U6, the operational amplifier U1 and the RC integral circuit U3. The integral forming circuit is composed of a secondary active integral filter circuit U7, the operational amplifier U1 and a passive RC filter circuit U8. The secondary amplification circuit is composed of a primary active integral filter circuit U9, the operational amplifier U1 and the passive RC filter circuit U8. According to the nuclear electronic experiment system amplification circuit, ideal quasi-Gaussian output can be obtained, and the accuracy of collecting processing in a later period is improved.
Description
Technical field
The invention belongs to nuclear radiation detection technical field, relate to and a kind ofly nuclear radiation is carried out to quantitative measurment technology, particularly Experiment of Nuclear Electronics system amplifying circuit.
Background technology
The signal that before nuclear electronics instrument, end detector detects is all generally very faint current signal; and usually can be subject to the interference of external environment and noise; therefore; when such small-signal is processed; generally all to first carry out preliminary treatment; surveying the signal needing, from the information with much noise signal, filter and come; and the current signal of microvolt level is transformed into voltage signal; it is amplified to volt level and again signal is carried out to pulse-shaping, to meet the needs of subsequent analysis measuring circuit.
Summary of the invention
Object of the present invention will be designed a kind of Experiment of Nuclear Electronics system amplifying circuit exactly, and the small-signal of nuclear electronics output is gathered and amplifies processing, collects required pulse signal, to meet the demand of follow-up Experiment of Nuclear Electronics system.
Technical scheme of the present invention:
A kind of Experiment of Nuclear Electronics system amplifying circuit, it comprises charge amplifier and main linear amplifier circuit two parts, preposition charge amplifier is used CA3140 chip U1, and main linear amplifier is comprised of differential shaping circuit, one-level amplifying circuit, integration shaping circuit, second amplifying circuit and baseline restorer circuit five parts; Passive RC filter circuit U4, set direction circuit U 5, operational amplifier U1 and RC integrating circuit U3 that differential shaping circuit is controlled by belt switch form; One-level amplifying circuit is comprised of amplitude limiter circuit U6, operational amplifier U1 and RC integrating circuit U3; Integration shaping circuit is comprised of the active integral filter circuit U7 of secondary, operational amplifier U1, passive RC filter circuit U8; Second amplifying circuit is comprised of the active integral filter circuit U9 of one-level, operational amplifier U1 and passive RC filter circuit U8.
Preferred:
Charge amplifier consists of CA3140 chip U1, high-pass filtering circuit U2 and RC integrating circuit U3, small-signal is input to CA3140 chip U1 after high-pass filtering circuit U2 filtering, and its output feeds back to No. 2 pins of CA3140 chip U1 through No. 4 pins of RC integrating circuit U3.
The passive RC filter circuit U4 that in described differential shaping circuit, front end signal is controlled by belt switch and set direction circuit U 5 are connected to No. 2, No. 3 pins of operational amplifier U1, output and negative input end cross-over connection RC integrating circuit U3 at operational amplifier U1 form negative feedback, and No. 2, No. 3 pins of set direction circuit U 5 are by the polarity of switch control break U1 input signal.
Described amplitude limiter circuit U6 is connected to the positive input terminal of operational amplifier U1, and its output feeds back to the negative input end of U1 by RC integrating circuit U3.
The active integral filter circuit U7 of described secondary is connected with the input in the same way of operational amplifier U1, and its output feeds back to the reverse input end of operational amplifier U1 by passive RC filter circuit U8; Secondary amplifier section by the active integral filter circuit U9 of one-level and operational amplifier U1 in the same way input be connected, operational amplifier U1 output feeds back to operational amplifier U1 negative input end by passive RC filter circuit U8, finally by baseline restorer circuit U 10 output signals.
The present invention is by the Weak pulse signal for end detector detects before nuclear electronics instrument, by the design of preposition charge amplifier, differential shaping circuit, one-level amplifying circuit, integration shaping circuit, second amplifying circuit and baseline restorer circuit, obtain desirable accurate Gauss's output, improved the accuracy of later stage acquisition process.
The present invention to nuclear electronics instrument before the small-signal that detects of end detector gather and amplify processing, collect required pulse signal, not only can meet the demand of follow-up Experiment of Nuclear Electronics system, can also the experimental teaching for relevant characteristic curriculum by this signal.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is preposition charge-sensitive schematic diagram;
Fig. 3 is differential shaping schematic view;
Fig. 4 is one-level enlarged diagram;
Fig. 5 is integration shaping schematic view;
Fig. 6 is that secondary amplifies and baseline restorer schematic diagram.
Embodiment
The present invention can specifically implement by foregoing invention technical scheme, report and embodiment is described further, yet scope of the present invention is not limited to following embodiment by following technology experiment.
Embodiment 1:
A kind of Experiment of Nuclear Electronics system amplifying circuit, it comprises charge amplifier and main linear amplifier circuit two parts, preposition charge amplifier is used CA3140 chip U1, and main linear amplifier is comprised of differential shaping circuit, one-level amplifying circuit, integration shaping circuit, second amplifying circuit and baseline restorer circuit five parts; Passive RC filter circuit U4, set direction circuit U 5, operational amplifier U1 and RC integrating circuit U3 that differential shaping circuit is controlled by belt switch form; One-level amplifying circuit is comprised of amplitude limiter circuit U6, operational amplifier U1 and RC integrating circuit U3; Integration shaping circuit is comprised of the active integral filter circuit U7 of secondary, operational amplifier U1, passive RC filter circuit U8; Second amplifying circuit is comprised of the active integral filter circuit U9 of one-level, operational amplifier U1 and passive RC filter circuit U8.
Charge amplifier consists of CA3140 chip U1, high-pass filtering circuit U2 and RC integrating circuit U3, small-signal is input to CA3140 chip U1 after high-pass filtering circuit U2 filtering, and its output feeds back to No. 2 pins of CA3140 chip U1 through No. 4 pins of RC integrating circuit U3.
The passive RC filter circuit U4 that in described differential shaping circuit, front end signal is controlled by belt switch and set direction circuit U 5 are connected to No. 2, No. 3 pins of operational amplifier U6, at output and the negative input end cross-over connection RC integrating circuit U3 of operational amplifier U6, form negative feedback.
Amplitude limiter circuit U6 is connected to the positive input terminal of operational amplifier U1, and its output feeds back to the negative input end of U1 by RC integrating circuit U3.
The active integral filter circuit U7 of secondary is connected with the input in the same way of operational amplifier U1, and its output feeds back to the reverse input end of operational amplifier U1 by passive RC filter circuit U8.
The active integral filter circuit U9 of one-level and operational amplifier U1 in the same way input are connected, and operational amplifier U1 output feeds back to operational amplifier U1 negative input end by passive RC filter circuit U8, finally by baseline restorer circuit U 10 output signals.
Above-mentioned U1 used makes circuit have large input impedance and little output impedance, and has very little bias current, and the integrating circuit that feedback end RC forms provides charging and discharging circuit for electric capacity.Thereby U4, by changing different resistances and the undershoot of capacitance erasure signal, improves output waveform.No. 6 pins of U4 connect No. 2 pins of U5.In differential moulding, U1 can change the polarity of input signal by U5 and U3, and No. 6 pins of U1 feed back to No. 3 pins of U5 by U3.In differential moulding U1 No. 6 pins amplify with one-level in No. 3 pins of U1 be connected, when the pulse amplitude of prime signal is excessive, by U1, understand further and amplifies, amplitude that afterwards can restricting signal through U6, anti-stop signal generation distortion.
Signal feeds back to its No. 2 pins through No. 6 pins of U1 by U3, in one-level amplification, No. 6 pins of U1 are connected with No. 3 pins of U1 in integration moulding, between No. 6 pins of U1 and No. 2 pins, be connected to the two-stage integration filter circuit being formed by RC, No. 6 pins of its output connect No. 3 pins of U1 in secondary amplification again, to realize multistage integration moulding, at No. 6 pins of U1, obtain the output of accurate Gaussian waveform.When input pulse signal frequency is very high, because discharging and recharging of coupling capacitance makes the baseline of output signal, produce skew, No. 6 pins of U1 are received to U10 for this reason, allow the baseline restorer of signal to original position to obtain required accurate Gaussian waveform.
In the present embodiment, apart from beyond special instruction, its U1-U10 relating to is universal circuit or electronic device.
Claims (6)
1. an Experiment of Nuclear Electronics system amplifying circuit, it comprises charge amplifier and main linear amplifier circuit two parts, it is characterized in that:
Preposition charge amplifier is used CA3140 chip U1;
Main linear amplifier is comprised of differential shaping circuit, one-level amplifying circuit, integration shaping circuit, second amplifying circuit and baseline restorer circuit five parts;
Passive RC filter circuit U4, set direction circuit U 5, operational amplifier U1 and RC integrating circuit U3 that differential shaping circuit is controlled by belt switch form;
One-level amplifying circuit is comprised of amplitude limiter circuit U6, operational amplifier U1 and RC integrating circuit U3;
Integration shaping circuit is comprised of the active integral filter circuit U7 of secondary, operational amplifier U1, passive RC filter circuit U8;
Second amplifying circuit is comprised of the active integral filter circuit U9 of one-level, operational amplifier U1 and passive RC filter circuit U8.
2. Experiment of Nuclear Electronics system amplifying circuit according to claim 1, it is characterized in that, charge amplifier consists of CA3140 chip U1, high-pass filtering circuit U2 and RC integrating circuit U3, small-signal is input to CA3140 chip U1 after high-pass filtering circuit U2 filtering, and its output feeds back to No. 2 pins of CA3140 chip U1 through No. 4 pins of RC integrating circuit U3.
3. Experiment of Nuclear Electronics system amplifying circuit according to claim 1 and 2, it is characterized in that, the passive RC filter circuit U4 that in described differential shaping circuit, front end signal is controlled by belt switch and set direction circuit U 5 are connected to No. 2, No. 3 pins of operational amplifier U1, at output and the negative input end cross-over connection RC integrating circuit U3 of operational amplifier U1, form negative feedback.
4. Experiment of Nuclear Electronics system amplifying circuit according to claim 1 and 2, is characterized in that, amplitude limiter circuit U6 is connected to the positive input terminal of operational amplifier U1, and its output feeds back to the negative input end of U1 by RC integrating circuit U3.
5. Experiment of Nuclear Electronics system amplifying circuit according to claim 1 and 2, it is characterized in that, the active integral filter circuit U7 of secondary is connected with the input in the same way of operational amplifier U1, and its output feeds back to the reverse input end of operational amplifier U1 by passive RC filter circuit U8.
6. Experiment of Nuclear Electronics system amplifying circuit according to claim 1 and 2, it is characterized in that, the active integral filter circuit U9 of one-level and operational amplifier U1 in the same way input are connected, operational amplifier U1 output feeds back to operational amplifier U1 negative input end by passive RC filter circuit U8, finally by baseline restorer circuit U 10 output signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410429954.4A CN104158499A (en) | 2014-08-28 | 2014-08-28 | Nuclear electronic experiment system amplification circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410429954.4A CN104158499A (en) | 2014-08-28 | 2014-08-28 | Nuclear electronic experiment system amplification circuit |
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| CN104158499A true CN104158499A (en) | 2014-11-19 |
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| CN201410429954.4A Pending CN104158499A (en) | 2014-08-28 | 2014-08-28 | Nuclear electronic experiment system amplification circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094628A (en) * | 2011-03-22 | 2011-06-15 | 东华理工大学 | LaBr3(Ce) crystal-based multi-channel gamma energy spectrum logging instrument |
| CN102106076A (en) * | 2008-06-25 | 2011-06-22 | 西凯渥资讯处理科技公司 | Systems and methods for implementing a harmonic rejection mixer |
| CN102253402A (en) * | 2011-05-26 | 2011-11-23 | 张阳 | Special charge sensitive amplifying circuit for gold silicon surface barrier semiconductor detector |
| CN103888084A (en) * | 2014-03-25 | 2014-06-25 | 中国科学院空间科学与应用研究中心 | Integrated pre-amplifier used for charged particle detector |
-
2014
- 2014-08-28 CN CN201410429954.4A patent/CN104158499A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102106076A (en) * | 2008-06-25 | 2011-06-22 | 西凯渥资讯处理科技公司 | Systems and methods for implementing a harmonic rejection mixer |
| CN102094628A (en) * | 2011-03-22 | 2011-06-15 | 东华理工大学 | LaBr3(Ce) crystal-based multi-channel gamma energy spectrum logging instrument |
| CN102253402A (en) * | 2011-05-26 | 2011-11-23 | 张阳 | Special charge sensitive amplifying circuit for gold silicon surface barrier semiconductor detector |
| CN103888084A (en) * | 2014-03-25 | 2014-06-25 | 中国科学院空间科学与应用研究中心 | Integrated pre-amplifier used for charged particle detector |
Non-Patent Citations (2)
| Title |
|---|
| 林延畅: "高灵敏度多元素现场X荧光探测系统的研制", 《中国博士学位论文全文数据库基础科学辑》 * |
| 王敏: "数字核能谱测量系统中滤波与成形技术研究", 《中国博士学位论文全文数据库工程科技Ⅱ辑》 * |
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Application publication date: 20141119 |