CN103368534B - Threshold circuit - Google Patents
Threshold circuit Download PDFInfo
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- CN103368534B CN103368534B CN201210100983.7A CN201210100983A CN103368534B CN 103368534 B CN103368534 B CN 103368534B CN 201210100983 A CN201210100983 A CN 201210100983A CN 103368534 B CN103368534 B CN 103368534B
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- Prior art keywords
- resistance
- operational amplifier
- diode
- threshold
- electric capacity
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- 230000003321 amplification Effects 0.000 claims abstract description 17
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 17
- 230000000149 penetrating effect Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 2
- 230000005251 gamma ray Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009206 nuclear medicine Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
Abstract
The invention provides a kind of threshold circuit, including anti-phase amplifying unit and threshold control unit with penetrate level and follow unit, wherein, described anti-phase amplifying unit, for input signal being carried out anti-phase amplification, and the input signal after anti-phase amplification is sent to described threshold control unit；Described threshold control unit, the input signal output after the anti-phase amplification that voltage is more than threshold voltage.Threshold circuit of the present invention can remove the invalid ray interference during being acquired radioactivity gamma ray.
Description
Technical field
The present invention relates to a kind of threshold circuit, particularly relate to a kind of thresholding for removing the interference of invalid ray
Circuit.
Background technology
Threshold circuit applies the photomultiplier tube signal Acquisition Circuit in nuclear medicine facility, this photomultiplier transit
Radioactivity gamma ray is acquired by pipe signal acquisition circuit, photoelectric conversion device turned by optical signal
Changing the faint signal of telecommunication into, the signal of telecommunication being done a series of process until forming digital signal to be stored in calculating
In machine.Prior art only has independent amplifying circuit or independent threshold circuit, it is impossible to meets and is applied to photoelectricity
The technical need of the threshold circuit of multiplier tube signal acquisition circuit.
Summary of the invention
A kind of threshold circuit of offer is provided, solves radioactivity gamma ray is carried out
The problem of invalid counting interference in gatherer process.
In order to achieve the above object, the invention provides a kind of threshold circuit, including anti-phase amplifying unit and
Threshold control unit and penetrate level and follow unit, wherein,
Described anti-phase amplifying unit, for carrying out anti-phase amplification, and by after anti-phase amplification to input signal
Input signal is sent to described threshold control unit；
Described threshold control unit, the input signal after the anti-phase amplification that voltage is more than threshold voltage
Output.
During enforcement, threshold circuit of the present invention also includes that penetrating level follows unit；
Input signal after voltage is more than the anti-phase amplification of threshold voltage by described threshold control unit is sent to
Described level of penetrating follows unit.
During enforcement, described anti-phase amplifying unit include the first operational amplifier, the first resistance, the second resistance,
Adjustable resistance and the first electric capacity, wherein,
Described first resistance is connected with the inverting input of described first operational amplifier；
The normal phase input end of described first operational amplifier passes through described second resistance eutral grounding；
The outfan of described first operational amplifier passes through described adjustable resistance parallel with one another and described first
Electric capacity is connected with the inverting input of described operational amplifier.
During enforcement, described threshold control unit include the second operational amplifier, the 3rd resistance, the 4th resistance,
5th resistance, the 6th resistance, the second electric capacity, the first diode and the second diode, wherein,
The inverting input of described second operational amplifier is put with described first computing by described 3rd resistance
The outfan of big device connects；
The normal phase input end of described second operational amplifier passes through described 4th resistance eutral grounding；
The outfan of described second operational amplifier respectively with the positive pole of described first diode, described second
The negative pole of diode and the first end of described second electric capacity connect；
The negative pole of described first diode is connected with the inverting input of described second operational amplifier；
The positive pole of described second diode is followed unit be connected with described level of penetrating；
Second end of described second electric capacity is connected with the positive pole of described second diode；
Connect between negative pole and second end of described second electric capacity of described first diode and have the 5th resistance；
Described 6th resistance is connected with the inverting input of described second operational amplifier；
Threshold voltage inputs described second operational amplifier by described 6th resistance.
During enforcement, described in penetrate level and follow unit and include the 3rd operational amplifier；
The normal phase input end of described 3rd operational amplifier is connected with the positive pole of described second diode；
The inverting input of described 3rd operational amplifier connects with the outfan of described 3rd operational amplifier
Connect.
Compared with prior art, threshold circuit of the present invention can be removed and enter radioactivity gamma ray
Invalid ray interference in row gatherer process.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the threshold circuit described in first embodiment of the invention；
Fig. 2 is the circuit diagram of the threshold circuit described in second embodiment of the invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention express clearer, below in conjunction with
The present invention is further described in detail by drawings and the specific embodiments again.
The invention provides a kind of threshold circuit, during radioactivity gamma ray can being acquired
Invalid ray disturbs.
As it is shown in figure 1, the threshold circuit described in first embodiment of the invention include anti-phase amplifying unit 11,
Threshold control unit 12 and penetrate level and follow unit 13, wherein,
Described anti-phase amplifying unit 11, for carrying out anti-phase amplification, and by after anti-phase amplification to input signal
Input signal be sent to described threshold control unit 12；
Described threshold control unit 12, is connected with described anti-phase amplifying unit 11, for voltage is more than door
Input signal after the anti-phase amplification of voltage limit is penetrated level and is followed unit 13 described in being sent to；
Described level of penetrating follows unit 13, is connected with described threshold control unit 12, is used for so that from described
Input signal after the anti-phase amplification of threshold control unit 12 matches with circuit below.
Threshold circuit of the present invention is divided into three grades: the first order be anti-phase amplifier stage, the second level be thresholding
Controlled stage, the third level are for penetrating a grade following stage；
After input signal being done anti-phase amplification by anti-phase amplifier stage, negative signal is made to become positive signal；
To anti-phase output after this positive signal and threshold voltage being done additive operation during thresholding controlled stage, voltage is little
Signal in threshold voltage is prevented, and voltage is output to the third level more than the signal of threshold voltage；Described
Threshold voltage is negative；
Penetrate grade following stage and solve the problem that output signal is mutually matched with circuit part below.
As in figure 2 it is shown, the threshold circuit described in second embodiment of the invention is based on first embodiment of the invention
Described threshold circuit, in the threshold circuit described in second embodiment of the invention,
Described see-saw circuit includes the first operational amplifier U1A, the first resistance R1, the second resistance
R2, adjustable resistance W1 and the first electric capacity C1, wherein,
Described first operational amplifier U1A be model be the accurate four tunnel computings of noise high-speed of TLE2144
Amplifier；
The input IN of described threshold circuit is connected with first end of described first resistance R1, and described first
Second end of resistance R1 is connected with the inverting input of described first operational amplifier U1A；
Input signal inputs described first operational amplifier U1A by described first resistance R1；
The normal phase input end of described first operational amplifier U1A passes through described second resistance R2 ground connection；
The outfan of described first operational amplifier U1A by described adjustable resistance W1 parallel with one another and
The inverting input of described first electric capacity C1 and described operational amplifier U1A is connected；
The maximum resistance of described adjustable resistance W1 is 10 kilo-ohms；
The resistance value of described first resistance R1 is 1 kilo-ohm, and the resistance value of described second resistance R2 is 500
Ohm, the capacitance of described first electric capacity C1 is 100pF (pico farad)；
Described threshold control unit includes the second operational amplifier U1B, the 3rd resistance R3, the 4th resistance
R4, the 5th resistance R5, the 6th resistance R6, the second electric capacity C2, the first diode D1 and the two or two pole
Pipe D2, wherein,
Described second operational amplifier U1B be model be the accurate four tunnel computings of noise high-speed of TLE2144
Amplifier；
Described first diode D1 and described second diode D2 be model be the diode of 1N914；
The inverting input of described second operational amplifier U1B is by described 3rd resistance R3 and described the
The outfan of one operational amplifier U1A connects；
The normal phase input end of described second operational amplifier U1B passes through described 4th resistance R4 ground connection；
The outfan of described second operational amplifier U1B respectively with the positive pole of described first diode D1,
The negative pole of described second electric capacity D2 and first end of described second electric capacity C2 connect；
The negative pole of described first diode D1 connects with the inverting input of described second operational amplifier U1B
Connect；
The positive pole of described second diode D2 is followed unit be connected with described level of penetrating；
Second end of described second electric capacity C2 is connected with the positive pole of described second electric capacity D2；
Connect between negative pole and second end of described second electric capacity C2 of described first diode D1 and have the 5th
Resistance R5；
Described 6th resistance R6 is connected with the inverting input of described second operational amplifier U1B；
Threshold voltage inputs described second operational amplifier U1B by described 6th resistance R6；
The resistance value of described 3rd resistance R3 is 1 kilo-ohm, and the resistance value of described 4th resistance R4 is 500
Ohm, described 5th resistance R5 resistance value is 1 kilo-ohm, and the resistance value of described 6th resistance R6 is 1
Kilo-ohm, the capacitance of described second electric capacity C2 is 39pF-47pF；
Described level of penetrating is followed unit and is included the 3rd operational amplifier U1C；
Described 3rd operational amplifier U1C be model be the accurate four tunnel computings of noise high-speed of TLE2144
Amplifier；
The normal phase input end of described 3rd operational amplifier U1C connects with the positive pole of described second diode D2
Connect；
The inverting input of described 3rd operational amplifier U1C is defeated with described 3rd operational amplifier U1C's
Go out end to connect；
The outfan of described 3rd operational amplifier U1C is the outfan OUT of described threshold circuit；
During enforcement, described see-saw circuit also includes the 7th resistance R7, the 8th resistance R8, the 3rd electric capacity
C3 and the 4th electric capacity C4, wherein,
The positive power source terminal of described first operational amplifier U1A, by described 3rd electric capacity C3 ground connection, and
It is connected with high level output end by the 7th resistance R7；
The negative power end of described second operational amplifier U1A, by described 4th electric capacity C4 ground connection, and
It is connected with low level output end by described 8th resistance R8；
The output voltage of described high level output end is+15V, and the output voltage of described low level output end is
-15V, the resistance value of described 7th resistance R7 is 10 ohm, and the resistance value of described 8th resistance R8 is
10 ohm, the capacitance of described 3rd electric capacity C3 is 0.1 μ F, and the capacitance of described 4th electric capacity C4 is
0.1μF。
In the threshold circuit described in second embodiment of the invention, described anti-phase amplification signals collecting input letter
Number, and by adjusting the resistance value of described adjustable resistance W1 so that input signal is zoomed in and out adjustment；
Described first electric capacity C1 is integrating capacitor, and the capacity adjusting described first electric capacity C1 can effectively change
Become the pulse width of input signal so that input signal is applicable to the determination of coordinate position, for blender electricity
Lay a good foundation in road；
Described threshold control unit is the key component of threshold circuit, acts primarily as restriction input signal and output
The quantitative relationship of signal；Described threshold voltage is negative voltage, as in figure 2 it is shown, A point is described thresholding control
The input of unit processed, inputs the signal place by described anti-phase amplifying unit of described threshold control unit
Reason becomes positive signal, does additive operation with threshold voltage, if inputting the signal of described threshold control unit
Voltage more than threshold voltage, then this signal exports C point via described second operational amplifier U1B,
The signal of C point is negative signal, and described first diode D1 cut-off is then equivalent to open circuit, and this second computing is put
Big device U1B is in open loop situations, and C point signal drastically raises, described second diode D2 conducting, this
Partial circuit is the formation of normal amplifier circuit, and D point is the outfan of described threshold control unit；
If the voltage inputting the signal of described threshold control unit less than threshold voltage or inputs the control of described thresholding
The signal of unit is negative signal, then this signal exports C point, C point by described operational amplifier U1B
Signal be positive signal, described first diode D1 conducting, described second diode D2 cut-off formation close
Ring status, D point no signal exports；
3rd pole is to penetrate level to follow unit, and its feature is that input resistance is big, and output resistance is little, effectively
Solve the Signal Matching problem of output signal and next stage circuit.
Described above it is merely exemplary for the purpose of the present invention, and nonrestrictive, ordinary skill
Personnel understand, in the case of the spirit and scope limited without departing from claims, can make perhaps
Many amendments, change or equivalence, but fall within protection scope of the present invention.
Claims (2)
1. a threshold circuit, it is characterised in that include anti-phase amplifying unit and threshold control unit and penetrate
Level follows unit, wherein,
Described anti-phase amplifying unit, for carrying out anti-phase amplification, and by after anti-phase amplification to input signal
Input signal is sent to described threshold control unit；
Described threshold control unit, the input signal after the anti-phase amplification that voltage is more than threshold voltage
Output；
Described anti-phase amplifying unit includes the first operational amplifier, the first resistance, the second resistance, adjustable electric
Resistance and the first electric capacity, wherein,
Described first resistance is connected with the inverting input of described first operational amplifier；
The normal phase input end of described first operational amplifier passes through described second resistance eutral grounding；
The outfan of described first operational amplifier passes through described adjustable resistance parallel with one another and described first
Electric capacity is connected with the inverting input of described operational amplifier；
Described threshold control unit includes the second operational amplifier, the 3rd resistance, the 4th resistance, the 5th electricity
Resistance, the 6th resistance, the second electric capacity, the first diode and the second diode, wherein,
The inverting input of described second operational amplifier is put with described first computing by described 3rd resistance
The outfan of big device connects；
The normal phase input end of described second operational amplifier passes through described 4th resistance eutral grounding；
The outfan of described second operational amplifier respectively with the positive pole of described first diode, described second
The negative pole of diode and the first end of described second electric capacity connect；
The negative pole of described first diode is connected with the inverting input of described second operational amplifier；
The positive pole of described second diode is followed unit be connected with described level of penetrating；
Second end of described second electric capacity is connected with the positive pole of described second diode；
Connect between negative pole and second end of described second electric capacity of described first diode and have the 5th resistance；
Described 6th resistance is connected with the inverting input of described second operational amplifier；
Threshold voltage inputs described second operational amplifier by described 6th resistance；
Described threshold circuit also includes that penetrating level follows unit；
Input signal after voltage is more than the anti-phase amplification of threshold voltage by described threshold control unit is sent to
Described level of penetrating follows unit.
2. threshold circuit as claimed in claim 1, it is characterised in that described in penetrate level and follow unit and include
3rd operational amplifier；
The normal phase input end of described 3rd operational amplifier is connected with the positive pole of described second diode；
The inverting input of described 3rd operational amplifier connects with the outfan of described 3rd operational amplifier
Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210100983.7A CN103368534B (en) | 2012-04-09 | 2012-04-09 | Threshold circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210100983.7A CN103368534B (en) | 2012-04-09 | 2012-04-09 | Threshold circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103368534A CN103368534A (en) | 2013-10-23 |
| CN103368534B true CN103368534B (en) | 2016-08-24 |
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| CN201210100983.7A Expired - Fee Related CN103368534B (en) | 2012-04-09 | 2012-04-09 | Threshold circuit |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202513890U (en) * | 2012-04-09 | 2012-10-31 | 北京大基康明医疗设备有限公司 | Threshold circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2671830B2 (en) * | 1994-11-04 | 1997-11-05 | 日本電気株式会社 | Optical receiving circuit |
| JP4434597B2 (en) * | 2003-02-17 | 2010-03-17 | ヤマハ株式会社 | Noise removal circuit |
| JP2005072925A (en) * | 2003-08-25 | 2005-03-17 | Nec Kansai Ltd | Photoelectric current and voltage converting circuit |
| DE102004006957A1 (en) * | 2004-02-12 | 2005-09-15 | Infineon Technologies Ag | Method and device for amplifying a received signal |
| CN101873124B (en) * | 2010-05-24 | 2012-03-14 | 哈尔滨工程大学 | Self-adaptive threshold pulse amplified shaping circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202513890U (en) * | 2012-04-09 | 2012-10-31 | 北京大基康明医疗设备有限公司 | Threshold circuit |
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