CN105991095A - High-sensitivity anti-radiation preamplifier arranged at far front end - Google Patents
High-sensitivity anti-radiation preamplifier arranged at far front end Download PDFInfo
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- CN105991095A CN105991095A CN201610013795.9A CN201610013795A CN105991095A CN 105991095 A CN105991095 A CN 105991095A CN 201610013795 A CN201610013795 A CN 201610013795A CN 105991095 A CN105991095 A CN 105991095A
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- preamplifier
- high speed
- radioprotective
- radiation
- integrated
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a high-sensitivity anti-radiation preamplifier arranged at far front end. The preamplifier comprises multi-stage sequentially cascaded high-speed integrated special operational amplifiers and an anti-radiation power supply module for supplying power to each stage of high-speed integrated special operational amplifier. The multi-stage sequentially cascaded high-speed integrated special operational amplifiers are regulated by a baseline control circuit. The preamplifier is implemented by cascading of the multi-stage high-speed integrated special operational amplifiers and optimization of circuits. High gain is provided while the possibility of front-oscillation is suppressed by necessary feedback, and thus stability of the preamplifier is improved. Meanwhile, baseline stability of the multi-stage sequentially cascaded high-speed integrated special operational amplifiers is needed to be regulated by means of the baseline control circuit.
Description
Technical field
The present invention relates to preamplifier field, specifically a kind of remote front end, highly sensitive, radioprotective preamplifier.
Background technology
Nuclear survey meter device for nuclear detection field, normally due to detector output signal is fainter, is required for by front
Give main electronics again after putting amplifier amplification and carry out signal processing.Under normal conditions, Preamplifier should be with spy
Survey device distance is the nearest more is conducive to suppressing the noise caused in signals transmission.But measure field at some special core
Close (reaction core measurement, fusion tokamak core measurement etc.), the radioprotective of detector position and other radiation (electricity
Magnetic, heat radiation) the strongest, it is therefore necessary to preamplifier is designed away from detector, and preamplifier needs the offer must
The capability of resistance to radiation wanted.At present, domestic in highly sensitive preamplifier (current gain 106V/A or charge gain are more than
1012V/C) research and application, preamplifier is typically no longer than 10 meters with the distance of detector, the most preposition amplification
The capability of resistance to radiation of device does not has clear and definite index yet.
Summary of the invention it is an object of the invention to provide a kind of remote front end, highly sensitive, radioprotective preamplifier, to solve
The problem that prior art is weak to nuclear radiation in the preamplifier that core is measured is placed on radioprotective district.
In order to achieve the above object, the technical solution adopted in the present invention is:
Remote front end, highly sensitive, radioprotective preamplifier, it is characterised in that: include that the multistage high speed cascaded successively is integrated special
Operational amplifier, and supply power to the radioprotective power module of every grade of integrated special purpose op amp of high speed, the height of multi-stage cascade
The integrated special purpose op amp of speed is regulated by control line circuit；Side by the cascade of multistage high speed integrated special purpose op amp
Formula, and the optimization realization of circuit；By the probability of the necessary preposition vibration of feedback suppression while providing high-gain, carry
The stability of high preamplifier；Meanwhile, the baseline stability of the integrated special purpose op amp of the high speed of multi-stage cascade needs
Control line circuit to be passed through regulates；On this basis, the placement-and-routing of preamplifier has been carried out careful design, has added
The integrated level of amplifier channel number, thus reduce the size of anti-radiation shield protection body.
Described remote front end, highly sensitive, radioprotective preamplifier, it is characterised in that: by control line circuit design
In special Signal Matching mode, control reflection and the vibration of high speed nuclear signal.Simultaneously by rational circuit integration and differential
Mode, can effectively reduce the contribution of white noise on cable.It is finally reached the purpose of remote front end signal transmission.
Described remote front end, highly sensitive, radioprotective preamplifier, it is characterised in that: by radioprotective device select and
The radiation hardening of part nucleus module, it is achieved the radiation resistance raising that preamplifier is overall.
Advantage of the present invention is:
1, this preamplifier may be used for having remote front end signal transmittability, can be in the range finder position more than 20 meters
Put and use, greatly reduce preamplifier by core, magnetic and thermal-radiating probability；
2, this preamplifier have employed radiation-hardened design method and makes in the strong radioprotective such as reactor or tokamak device
Field, this preamplifier still can normally work.It is provided with remote front end delivery compared with traditional preamplifier and resists
The ability of radiation.
Accompanying drawing explanation
Fig. 1 is present configuration block diagram.
Fig. 2 is the circuit diagram of input stage of the present invention.
Detailed description of the invention
As it is shown in figure 1, remote front end, highly sensitive, radioprotective preamplifier, it is characterised in that: include multistage cascading successively
The integrated special purpose op amp of high speed, and supply power to the radioprotective power supply mould of every grade of integrated special purpose op amp of high speed
Block, the integrated special purpose op amp of high speed of multi-stage cascade is regulated by control line circuit；By the integrated special fortune of multistage high speed
Calculate the mode of amplifier cascade, and the optimization of circuit realizes；Before passing through necessary feedback suppression while high-gain is provided
Put the probability of vibration, improve the stability of preamplifier；Meanwhile, the integrated special operation amplifier of the high speed of multi-stage cascade
The baseline stability sexual needs of device are regulated by control line circuit；On this basis, the placement-and-routing of preamplifier is carried out
Careful design, adds the integrated level of amplifier channel number, thus reduces the size of anti-radiation shield protection body.
By Signal Matching mode special in control line circuit design, control reflection and the vibration of high speed nuclear signal.
Simultaneously by rational circuit integration and differentiated manner, the contribution of white noise on cable can be effectively reduced.It is finally reached remote
The purpose of front end signal transmission.
Selected by radioprotective device and the radiation hardening of part nucleus module, it is achieved the anti-spoke that preamplifier is overall
Penetrate performance to improve.
Remote front end, highly sensitive, radioprotective preamplifier mainly realize the remote of high speed core pulse signal by circuit design
Distance Transmission is mated, and the circuit design principle of its input stage is as shown in Figure 2.In Fig. 2, the anti-phase input of first order amplifier U1A
Holding by resistance R3, electric capacity C2, resistance R1 ground connection, in-phase input end passes through resistance R5 ground connection, draws between resistance R1 and electric capacity C2
Go out wire and connect ground connection after electric capacity C1, resistance R4, electric capacity C4, between inverting input with outfan, be connected electric capacity parallel with one another
C3 and resistance R2.Generally needed to be added the demand of bias voltage in view of nuclear detector, can by electric capacity C1 in Fig. 2, resistance R1,
The special matched mode of electric capacity C2 realizes, and wherein the earth resistance of R1 about 51 ohm is in order to realize carrying out Signal Terminal coupling,
After needing by reality, the input impedance of first order amplifier to be measured, then this resistance parameter is finely adjusted so that put
Big device overall impedance is identical with transmission cable characteristic impedance.C1 electric capacity is in order to isolate HVB high voltage bias, and C2 electric capacity is in order to protect
Card earth resistance does not affect the bias voltage of amplifier in and arranges, and reaches while finally realizing remote front end signal transmission coupling
The purpose of signal input is not affected to bias voltage.
In terms of radiation hardening, it is concluded that common power core by anti-neutron radiation and gamma radiation experiment test
The resistance to irradiation grade of sheet is low one to two orders of magnitude than integrated transporting discharging.From improving the radiation resistance of integrated circuit and making up anti-
The mentality of designing of radiation weak link is set out, and power supply chip is carried out radiation hardening.Entered investigation and experiment test, finally selected
With using ST company radioprotective power supply chip RHFL4913 and RHFL7913 to substitute common power chip, and power supply chip is led to
The form crossing increase composite shielding body carries out single radiation hardening, is finally reached overall raising preamplifier radiation resistance
The purpose of energy.
Claims (3)
1. remote front end, highly sensitive, radioprotective preamplifier, it is characterised in that: include that the multistage high speed cascaded successively is integrated specially
With operational amplifier, and supply power to the radioprotective power module of every grade of integrated special purpose op amp of high speed, multi-stage cascade
The integrated special purpose op amp of high speed is regulated by control line circuit；By the cascade of multistage high speed integrated special purpose op amp
Mode, and the optimization realization of circuit；By the probability of the necessary preposition vibration of feedback suppression while providing high-gain,
Improve the stability of preamplifier；Meanwhile, the baseline stability of the integrated special purpose op amp of the high speed of multi-stage cascade
Need to be regulated by control line circuit；On this basis, the placement-and-routing of preamplifier is carried out careful design, increased
The integrated level of amplifier channel number, thus reduce the size of anti-radiation shield protection body.
Remote front end the most according to claim 1, highly sensitive, radioprotective preamplifier, it is characterised in that: by baseline control
Signal Matching mode special in circuit design processed, controls reflection and the vibration of high speed nuclear signal, simultaneously by rational circuit
Integration and differentiated manner, can effectively reduce the contribution of white noise on cable, is finally reached the purpose of remote front end signal transmission.
Remote front end the most according to claim 1, highly sensitive, radioprotective preamplifier, it is characterised in that: pass through radioprotective
Device selects and the radiation hardening of part nucleus module, it is achieved the radiation resistance raising that preamplifier is overall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610013795.9A CN105991095A (en) | 2016-01-06 | 2016-01-06 | High-sensitivity anti-radiation preamplifier arranged at far front end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610013795.9A CN105991095A (en) | 2016-01-06 | 2016-01-06 | High-sensitivity anti-radiation preamplifier arranged at far front end |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105991095A true CN105991095A (en) | 2016-10-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201610013795.9A Pending CN105991095A (en) | 2016-01-06 | 2016-01-06 | High-sensitivity anti-radiation preamplifier arranged at far front end |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646576A (en) * | 2016-11-28 | 2017-05-10 | 中国科学院合肥物质科学研究院 | High gain analog amplification device suitable for strong nuclear radiation environment |
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