CN102545789A - Head amplifier for weak signal - Google Patents
Head amplifier for weak signal Download PDFInfo
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- CN102545789A CN102545789A CN2010106208274A CN201010620827A CN102545789A CN 102545789 A CN102545789 A CN 102545789A CN 2010106208274 A CN2010106208274 A CN 2010106208274A CN 201010620827 A CN201010620827 A CN 201010620827A CN 102545789 A CN102545789 A CN 102545789A
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- preamplifier
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Abstract
The invention provides a head amplifier for a weak signal. The head amplifier comprises a voltage filter circuit and an amplifying circuit, wherein the voltage filter circuit is used for filtering to generate a bias voltage; the amplifying circuit is used for amplifying an input signal biased through the bias voltage to generate an amplified signal; and the voltage filter circuit and the amplifying circuit are integrated on the same circuit board. The head amplifier can be used for amplifying an output signal of a neutron detector.
Description
Technical field
The present invention relates to preamplifier, more specifically, relate to the preamplifier that is used for weak signal.
Background technology
Preamplifier is widely used in the preparatory amplification of weak signal, for example to the preparatory amplification of neutron detector output signal.
At the radioactive substance detection range, use neutron detector to survey the neutron ray that radioactive substance is launched, be the corresponding signal of telecommunication and output with its intensity-conversion, with existing and radioactive size of indication radioactive substance.
The output signal of neutron detector generally a little less than, handle for ease, need to use preamplifier that it is amplified in advance.When amplifying in advance, need apply HVB high voltage bias to the output signal of neutron detector.Because the amplitude of output signal is much littler than the amplitude of bias voltage, its noise that very easily is biased on the voltage floods, thereby can't obtain accurate amplified result.
In addition, the variation of temperature and humidity in the surrounding environment, electromagnetic interference and vibrations all might make preamplifier produce noise.
There is following problem in the preamplifier of prior art: 1, baseline noise is big; 2, adaptive capacity to environment is poor, particularly under hot and humid, is easy to generate noise; 3, poor anti jamming capability, the ability of particularly anti-electromagnetic noise and anti-vibration noise; 4, technological level does not reach the requirement of miniaturization.
Therefore, be desirable to provide and a kind ofly can accurately amplify, have good adaptive capacity to environment and antijamming capability and the preamplifier of compact conformation weak signal.
Summary of the invention
For solving above-mentioned one or more problems the present invention is proposed.
According to an aspect of the present invention, a kind of preamplifier is provided, has comprised: the voltage filter circuit, carry out filtering to produce bias voltage to voltage; Amplifying circuit amplifies to produce amplifying signal the input signal through said bias voltage biasing, and wherein: said voltage filter circuit and said amplifying circuit are integrated on the circuit board.
This preamplifier can be used for the amplification of neutron detector output signal.
According to a further aspect in the invention, said preamplifier also comprises: signal amplification circuit, further amplify said amplifying signal.
Preferably, said signal amplification circuit is integrated on the said circuit board.
According to another aspect of the invention, said preamplifier also comprises: signal transformation circuit, carry out shaping to produce reshaping signal to said amplifying signal; And signal amplification circuit, said reshaping signal is further amplified.
Preferably, said signal transformation circuit and said signal amplification circuit are integrated on the said circuit board.
Preferably, said preamplifier also comprises: signal input interface, be coupled to amplifying circuit, and be used to receive said input signal; The voltage input interface is coupled to the voltage filter circuit, is used to receive said voltage; Signal output interface is coupled to amplifying circuit, is used to export said amplifying signal.Said signal input interface, voltage input interface and signal output interface are integrated on the said circuit board, and are the high pressure resistant interfaces of band shielding.
Preferably, said amplifying circuit is a low noise amplifier circuit.
Preferably, said circuit board is through the conformal coating PROCESS FOR TREATMENT.
Preferably, said circuit board is encapsulated in the shell that comprises lower house.
Preferably, the connection line between said circuit board and the said shell is carried out the conformal coating PROCESS FOR TREATMENT.
Preamplifier according to the present invention is integrated in each element on the circuit board, has shortened the distance between the element, thereby has significantly reduced the interference introduced in the bias voltage transmission course, obtains good noise robustness.
Simultaneously, according to the position relative fixed between the element of preamplifier of the present invention, avoid operating and transportation in cause between the element tractive each other to cause owing to vibrations damage, obtain good anti-shake performance.
In addition, preamplifier according to the present invention has been realized miniaturization of devices, device cost be can boost productivity, reduce, transportation and carrying cost reduced, and more convenient to use.
In addition; Can carry out conformal coating technology to the monoblock circuit board with the mode of one according to preamplifier of the present invention; And preferably being connected between circuit board and the casing for encapsulating circuit board carried out the conformal coating PROCESS FOR TREATMENT, thereby further improve its environmental adaptability.
Description of drawings
In conjunction with accompanying drawing, according to the following explanation to exemplary embodiment, above-mentioned and/or other aspects of general plotting of the present invention will become obvious and be easier to and understand, and in the accompanying drawings, similarly Reference numeral refers to similar part.Wherein:
Fig. 1 shows the circuit diagram of preamplifier according to an embodiment of the invention.
Fig. 2 shows the circuit diagram of preamplifier in accordance with another embodiment of the present invention.
Fig. 3 shows the circuit diagram of the preamplifier of another embodiment according to the present invention.
Embodiment
Disclosing of hereinafter provides many various embodiment or example to realize technical scheme provided by the invention.Though hereinafter parts and the setting to specific examples is described,, they only are example, and purpose does not lie in restriction the present invention.
Fig. 1 shows the circuit diagram according to the preamplifier that is used for weak signal 100 of the embodiment of the invention.
As shown in Figure 1, preamplifier 100 comprises amplifying circuit 101, signal input interface 102, voltage input interface 103, voltage filter circuit 104, signal output interface 105.
Preferably, amplifying circuit 101 is low noise amplifier circuits, and it uses low noise operational amplifier and low noise peripheral component, to realize high-gain and high s/n ratio.
Preferably, signal input interface 102, voltage input interface 103 and signal output interface 105 are high pressure resistant interfaces of band shielding, with shield electromagnetic interference effectively with good high voltage performance is provided.
Preferably, the circuit board that is provided with preamplifier 100 is carried out conformal coating technology.
Preferably, the circuit board that is provided with preamplifier 100 is encapsulated in the shell that comprises lower house, makes it good electrical contact performance and effectiveness arranged with relevant connector.Wherein, said circuit board is fixed on the lower house, and is covered by upper shell.
Said circuit board links to each other with interface on the shell via suitable connection line, thereby provides via the input-output operation of the interface on the shell to circuit board.
Preferably, the connection line between said circuit board and the shell is carried out the conformal coating PROCESS FOR TREATMENT.
Simultaneously; According to the preamplifier of the embodiment of the invention through each element being integrated on the circuit board; Make position relative fixed between them, avoid operating and transportation in cause between the element tractive each other to cause owing to vibrations damage, obtain good anti-shake performance.
In addition, through each element is integrated on the circuit board, realized miniaturization of devices, can boost productivity, reduce device cost, reduce transportation and carrying cost according to the preamplifier of the embodiment of the invention, and more convenient to use.
In addition, through each element being integrated on the circuit board, can carry out conformal coating technology to the monoblock circuit board, further improve its environmental adaptability with the mode of one according to the preamplifier of the embodiment of the invention.
Fig. 2 shows the circuit diagram of preamplifier 200 according to another embodiment of the present invention.
As shown in Figure 2, preamplifier 200 comprises amplifying circuit 201, signal input interface 202, voltage input interface 203, voltage filter circuit 204, signal output interface 205, signal amplification circuit 206.
Signal input interface 202 receives weak signal to be amplified as input signal.Voltage input interface 203 receives high voltage, after the voltage filter circuit filtering, is applied to input signal as bias voltage.The input signal of 201 pairs of biasings of amplifying circuit amplifies.The output of 206 pairs of amplifying circuits 201 of signal amplification circuit is further amplified, then via the further amplifying signal of signal output interface 205 outputs.Amplifying circuit 201, signal input interface 202, voltage input interface 203, voltage filter circuit 204, signal output interface 205, signal amplification circuit 206 are integrated on the circuit board.
Preamplifier 200 shown in Figure 2 has increased signal amplification circuit 206 on the basis of the preamplifier 100 of Fig. 1, the output of amplifying circuit 201 is further amplified, and with the amplitude of increase input signal, and better electrical isolation is provided.Preferably, signal amplification circuit 206 is integrated on the circuit board with other elements.
Fig. 3 shows the circuit diagram of preamplifier 300 according to another embodiment of the present invention.
As shown in Figure 3, preamplifier 300 comprises amplifying circuit 301, signal input interface 302, voltage input interface 303, voltage filter circuit 304, signal output interface 305, signal amplification circuit 306, signal transformation circuit 307.
Preamplifier of the present invention is applicable to the detector signal that amplifies neutron detector, wherein detector signal is imported preamplifier as input signal.But it will be understood by those skilled in the art that preamplifier of the present invention also is applicable to the amplification of other weak signals.
Above description only be used to execution mode of the present invention is described, and do not really want to limit scope of the present invention.It should be appreciated by those skilled in the art that scope of the present invention is defined by the following claims.Do not break away from any modification or the local replacement of spirit of the present invention and principle, all should fall within the scope of the present invention.
Claims (13)
1. preamplifier comprises:
The voltage filter circuit carries out filtering to produce bias voltage to voltage;
Amplifying circuit, amplify to produce amplifying signal, wherein the input signal through said bias voltage biasing:
Said voltage filter circuit and said amplifying circuit are integrated on the circuit board.
2. preamplifier according to claim 1 also comprises:
Signal amplification circuit further amplifies said amplifying signal.
3. preamplifier according to claim 2, wherein said signal amplification circuit is integrated on the said circuit board.
4. preamplifier according to claim 1 also comprises:
Signal transformation circuit carries out shaping to produce reshaping signal to said amplifying signal; And
Signal amplification circuit further amplifies said reshaping signal.
5. preamplifier according to claim 4, wherein said signal transformation circuit and said signal amplification circuit are integrated on the said circuit board.
6. preamplifier according to claim 1 also comprises:
Signal input interface is coupled to amplifying circuit, is used to receive said input signal;
The voltage input interface is coupled to the voltage filter circuit, is used to receive said voltage;
Signal output interface is coupled to amplifying circuit, is used to export said amplifying signal.
7. preamplifier according to claim 6, wherein said signal input interface, said voltage input interface, said signal output interface are integrated on the said circuit board.
8. preamplifier according to claim 7, wherein said signal input interface, said voltage input interface and said signal output interface are the high pressure resistant interfaces of band shielding.
9. according to each described preamplifier among the claim 1-8, wherein said amplifying circuit is a low noise amplifier circuit.
10. according to each described preamplifier among the claim 1-8, wherein said circuit board is through the conformal coating PROCESS FOR TREATMENT.
11., be used to amplify the output signal of neutron detector according to each described preamplifier among the claim 1-8.
12. according to each described preamplifier among the claim 1-8, wherein said circuit board is encapsulated in the shell that comprises lower house.
13. preamplifier according to claim 12 is wherein carried out the conformal coating PROCESS FOR TREATMENT to the connection line between said circuit board and the said shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106208274A CN102545789A (en) | 2010-12-31 | 2010-12-31 | Head amplifier for weak signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106208274A CN102545789A (en) | 2010-12-31 | 2010-12-31 | Head amplifier for weak signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102545789A true CN102545789A (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010106208274A Pending CN102545789A (en) | 2010-12-31 | 2010-12-31 | Head amplifier for weak signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102545789A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038159A (en) * | 2014-06-09 | 2014-09-10 | 广州广电计量检测股份有限公司 | Electromagnetic compatibility pre-amplifier and control method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4835485A (en) * | 1988-03-25 | 1989-05-30 | General Electric Company | Unconditionally-stable ultra low noise R.F. preamplifier |
| CN2678093Y (en) * | 2003-12-17 | 2005-02-09 | 张裕辉 | Control switch panel |
| CN1672475A (en) * | 2002-06-27 | 2005-09-21 | Ppg工业俄亥俄公司 | Single or multi-layer printed circuit board with recessed or extended breakaway tabs and method of manufacture thereof |
| CN1793607A (en) * | 2005-07-07 | 2006-06-28 | 中国石化集团胜利石油管理局测井公司 | Compensating neutron well logging instrument |
| CN201541238U (en) * | 2009-09-11 | 2010-08-04 | 清华大学 | Preamplifier of magnetic resonance imaging MRI system capable of reducing low-frequency noise |
| CN201690366U (en) * | 2009-10-21 | 2010-12-29 | 张有利 | Alternating current high-potential electric field generating device for fresh-keeping, freezing and refrigeration |
| CN201937546U (en) * | 2010-12-31 | 2011-08-17 | 同方威视技术股份有限公司 | Preamplifier for weak signals |
-
2010
- 2010-12-31 CN CN2010106208274A patent/CN102545789A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4835485A (en) * | 1988-03-25 | 1989-05-30 | General Electric Company | Unconditionally-stable ultra low noise R.F. preamplifier |
| CN1672475A (en) * | 2002-06-27 | 2005-09-21 | Ppg工业俄亥俄公司 | Single or multi-layer printed circuit board with recessed or extended breakaway tabs and method of manufacture thereof |
| CN2678093Y (en) * | 2003-12-17 | 2005-02-09 | 张裕辉 | Control switch panel |
| CN1793607A (en) * | 2005-07-07 | 2006-06-28 | 中国石化集团胜利石油管理局测井公司 | Compensating neutron well logging instrument |
| CN201541238U (en) * | 2009-09-11 | 2010-08-04 | 清华大学 | Preamplifier of magnetic resonance imaging MRI system capable of reducing low-frequency noise |
| CN201690366U (en) * | 2009-10-21 | 2010-12-29 | 张有利 | Alternating current high-potential electric field generating device for fresh-keeping, freezing and refrigeration |
| CN201937546U (en) * | 2010-12-31 | 2011-08-17 | 同方威视技术股份有限公司 | Preamplifier for weak signals |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104038159A (en) * | 2014-06-09 | 2014-09-10 | 广州广电计量检测股份有限公司 | Electromagnetic compatibility pre-amplifier and control method thereof |
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Application publication date: 20120704 |