CN103368534A - Threshold circuit - Google Patents
Threshold circuit Download PDFInfo
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- CN103368534A CN103368534A CN2012101009837A CN201210100983A CN103368534A CN 103368534 A CN103368534 A CN 103368534A CN 2012101009837 A CN2012101009837 A CN 2012101009837A CN 201210100983 A CN201210100983 A CN 201210100983A CN 103368534 A CN103368534 A CN 103368534A
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- 230000003321 amplification Effects 0.000 claims description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 abstract description 4
- 230000002285 radioactive effect Effects 0.000 abstract 1
- 239000011800 void material Substances 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 17
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009206 nuclear medicine Methods 0.000 description 1
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Abstract
The invention provides a threshold circuit including an invert amplifying unit, a threshold control unit and an emitter following unit, wherein the invert amplifying unit is used for carrying out invert amplifying on input signals and then transmitting the invert amplified input signals to the threshold control unit; and the threshold control unit is used for outputting invert amplified input signals with voltage larger than a threshold voltage. The threshold circuit is capable of eliminating interference of void rays in an acquisition process of radioactive gamma rays.
Description
Technical field
The present invention relates to a kind of threshold circuit, relate in particular to a kind of threshold circuit be used to removing invalid ray interference.
Background technology
Threshold circuit is applied in the photomultiplier tube signal Acquisition Circuit of nuclear medicine facility, this photomultiplier tube signal Acquisition Circuit gathers the radioactivity gamma rays, convert light signal to the faint signal of telecommunication by photoelectric conversion device, the signal of telecommunication is done a series of processing until the formation digital signal deposits in the computer.Prior art only has independent amplifying circuit or independent threshold circuit, can't satisfy the technical need of the threshold circuit that is applied to the photomultiplier tube signal Acquisition Circuit.
Summary of the invention
Main purpose of the present invention is to provide a kind of threshold circuit, solves the radioactivity gamma rays is carried out the problem that invalid counting disturbs in the gatherer process.
In order to achieve the above object, the invention provides a kind of threshold circuit, comprise anti-phase amplifying unit and thresholding control unit and penetrate the level follow the unit, wherein,
Described anti-phase amplifying unit is used for input signal is carried out anti-phase amplification, and the input signal after the anti-phase amplification is sent to described thresholding control unit;
Described thresholding control unit is used for the input signal output of voltage after greater than the anti-phase amplification of threshold voltage.
During enforcement, threshold circuit of the present invention comprises that also penetrating level follows the unit;
Described thresholding control unit is sent to the described level of penetrating with the input signal of voltage after greater than the anti-phase amplification of threshold voltage and follows the unit.
During enforcement, described anti-phase amplifying unit comprises the first operational amplifier, the first resistance, the second resistance, adjustable resistance and the first electric capacity, wherein,
Described the first resistance is connected with the inverting input of described the first operational amplifier;
The normal phase input end of described the first operational amplifier is by described the second grounding through resistance;
The output of described the first operational amplifier by described adjustable resistance parallel with one another be connected the first electric capacity and be connected with the inverting input of described operational amplifier.
During enforcement, described thresholding control unit comprises the second operational amplifier, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the second electric capacity, the first diode and the second diode, wherein,
The inverting input of described the second operational amplifier is connected with the output of described the first operational amplifier by described the 3rd resistance;
The normal phase input end of described the second operational amplifier is by described the 4th grounding through resistance;
The output of described the second operational amplifier respectively with the negative pole of the positive pole of described the first diode, described the second diode be connected the first end of the second electric capacity and be connected;
The negative pole of described the first diode is connected with the inverting input of described the second operational amplifier;
The positive pole of described the second diode is followed the unit and is connected with the described level of penetrating;
The second end of described the second electric capacity is connected with the positive pole of described the second diode;
Be connected with the 5th resistance between the second end of the negative pole of described the first diode and described the second electric capacity;
Described the 6th resistance is connected with the inverting input of described the second operational amplifier;
Threshold voltage is inputted described the second operational amplifier by described the 6th resistance.
During enforcement, the described level of penetrating is followed the unit and is comprised the 3rd operational amplifier;
The normal phase input end of described the 3rd operational amplifier is connected with the positive pole of described the second diode;
The inverting input of described the 3rd operational amplifier is connected with the output of described the 3rd operational amplifier.
Compared with prior art, threshold circuit of the present invention can be removed the invalid ray that the radioactivity gamma rays is carried out in the gatherer process and disturbs.
Description of drawings
Fig. 1 is the structured flowchart of the described threshold circuit of first embodiment of the invention;
Fig. 2 is the circuit diagram of the described threshold circuit of second embodiment of the invention.
Embodiment
For so that the purpose, technical solutions and advantages of the present invention are expressed clearlyer, below in conjunction with drawings and the specific embodiments the present invention is further described in detail again.
The invention provides a kind of threshold circuit, can the invalid ray that the radioactivity gamma rays carries out in the gatherer process be disturbed.
As shown in Figure 1, the described threshold circuit of first embodiment of the invention comprise anti-phase amplifying unit 11, thresholding control unit 12 and penetrate the level follow unit 13, wherein,
Described anti-phase amplifying unit 11 is used for input signal is carried out anti-phase amplification, and the input signal after the anti-phase amplification is sent to described thresholding control unit 12;
Described thresholding control unit 12 is connected with described anti-phase amplifying unit 11, is used for that the input signal of voltage after greater than the anti-phase amplification of threshold voltage is sent to the described level of penetrating and follows unit 13;
The described level of penetrating is followed unit 13, is connected with described thresholding control unit 12, is used for so that be complementary from the input signal after the anti-phase amplification of described thresholding control unit 12 and the circuit of back.
Threshold circuit of the present invention is divided into three grades: the first order is that anti-phase amplifying stage, the second level are that thresholding controlled stage, the third level are for penetrating a grade following stage;
After by anti-phase amplifying stage input signal being done anti-phase amplification, make negative signal become positive signal;
During to the thresholding controlled stage this positive signal and threshold voltage done anti-phase output after the add operation, voltage is prevented less than the signal of threshold voltage, and voltage is output to the third level greater than the signal of threshold voltage; Described threshold voltage is for negative;
Penetrate the problem that circuit part that grade following stage solves output signal and back mates mutually.
As shown in Figure 2, the described threshold circuit of second embodiment of the invention is based on the described threshold circuit of first embodiment of the invention, in the described threshold circuit of second embodiment of the invention,
Described see-saw circuit comprises the first operational amplifier U1A, the first resistance R 1, the second resistance R 2, adjustable resistance W1 and the first capacitor C 1, wherein,
Described the first operational amplifier U1A is that model is accurate four road operational amplifiers of noise high-speed of TLE2144;
The input IN of described threshold circuit is connected with the first end of described the first resistance R 1, and the second end of described the first resistance R 1 is connected with the inverting input of described the first operational amplifier U1A;
Input signal is by described the first operational amplifier U1A of described the first resistance R 1 input;
The normal phase input end of described the first operational amplifier U1A is by described the second resistance R 2 ground connection;
The output of described the first operational amplifier U1A by described adjustable resistance W1 parallel with one another be connected the first capacitor C 1 and be connected with the inverting input of described operational amplifier U1A;
The maximum resistance of described adjustable resistance W1 is 10 kilo-ohms;
The resistance value of described the first resistance R 1 is 1 kilo-ohm, and the resistance value of described the second resistance R 2 is 500 ohm, and the capacitance of described the first capacitor C 1 is 100pF (pico farad);
Described thresholding control unit comprises the second operational amplifier U1B, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the second capacitor C 2, the first diode D1 and the second diode D2, wherein,
Described the second operational amplifier U1B is that model is accurate four road operational amplifiers of noise high-speed of TLE2144;
Described the first diode D1 and described the second diode D2 are that model is the diode of 1N914;
The inverting input of described the second operational amplifier U1B is connected with the output of described the first operational amplifier U1A by described the 3rd resistance R 3;
The normal phase input end of described the second operational amplifier U1B is by described the 4th resistance R 4 ground connection;
The output of described the second operational amplifier U1B respectively with the negative pole of the positive pole of described the first diode D1, described the second electric capacity D2 be connected the first end of the second capacitor C 2 and be connected;
The negative pole of described the first diode D1 is connected with the inverting input of described the second operational amplifier U1B;
The positive pole of described the second diode D2 is followed the unit and is connected with the described level of penetrating;
The second end of described the second capacitor C 2 is connected with the positive pole of described the second electric capacity D2;
Be connected with the 5th resistance R 5 between the second end of the negative pole of described the first diode D1 and described the second capacitor C 2;
Described the 6th resistance R 6 is connected with the inverting input of described the second operational amplifier U1B;
Threshold voltage is by described the second operational amplifier U1B of described the 6th resistance R 6 inputs;
The resistance value of described the 3rd resistance R 3 is 1 kilo-ohm, and the resistance value of described the 4th resistance R 4 is 500 ohm, and described the 5th resistance R 5 resistance values are 1 kilo-ohm, and the resistance value of described the 6th resistance R 6 is 1 kilo-ohm, and the capacitance of described the second capacitor C 2 is 39pF-47pF;
The described level of penetrating is followed the unit and is comprised the 3rd operational amplifier U1C;
Described the 3rd operational amplifier U1C is that model is accurate four road operational amplifiers of noise high-speed of TLE2144;
The normal phase input end of described the 3rd operational amplifier U1C is connected with the positive pole of described the second diode D2;
The inverting input of described the 3rd operational amplifier U1C is connected with the output of described the 3rd operational amplifier U1C;
The output of described the 3rd operational amplifier U1C is the output OUT of described threshold circuit;
During enforcement, described see-saw circuit also comprises the 7th resistance R 7, the 8th resistance R 8, the 3rd capacitor C 3 and the 4th capacitor C 4, wherein,
The positive power source terminal of described the first operational amplifier U1A by described the 3rd capacitor C 3 ground connection, and is connected with the high level output end by the 7th resistance R 7;
The negative power end of described the second operational amplifier U1A by described the 4th capacitor C 4 ground connection, and is connected with the low level output end by described the 8th resistance R 8;
The output voltage of described high level output end is+15V, the output voltage of described low level output end is-15V, the resistance value of described the 7th resistance R 7 is 10 ohm, the resistance value of described the 8th resistance R 8 is 10 ohm, the capacitance of described the 3rd capacitor C 3 is 0.1 μ F, and the capacitance of described the 4th capacitor C 4 is 0.1 μ F.
In the described threshold circuit of second embodiment of the invention, described anti-phase amplifying signal Gather and input signal, and the resistance value by adjusting described adjustable resistance W1 is to carry out the convergent-divergent adjustment to input signal;
Described the first capacitor C 1 is integrating capacitor, and the capacity of adjusting described the first capacitor C 1 can effectively change the pulse duration of input signal, so that input signal is applicable to determining of coordinate position, for blender circuit is laid a good foundation;
Described thresholding control unit is the key component of threshold circuit, the main quantitative relationship that plays restriction input signal and output signal; Described threshold voltage is negative voltage, as shown in Figure 2, the A point is the input of described thresholding control unit, the signal of inputting described thresholding control unit becomes positive signal by the processing of described anti-phase amplifying unit, do add operation with threshold voltage, if input the voltage of signal of described thresholding control unit greater than threshold voltage, then this signal outputs to the C point via described the second operational amplifier U1B, the signal that C is ordered is negative signal, described the first diode D1 cut-off then is equivalent to open circuit, this second operational amplifier U1B is in open loop situations, C point signal sharply raises, described the second diode D2 conducting, this part circuit has just formed normal amplifier circuit, and the D point is the output of described thresholding control unit; If inputting the signal that the voltage of the signal of described thresholding control unit is lower than threshold voltage or inputs described thresholding control unit is negative signal, then this signal outputs to the C point by described operational amplifier U1B, the signal that C is ordered is positive signal, described the first diode D1 conducting, described the second diode D2 cut-off forms the closed loop state, the output of D point no signal;
The 3rd utmost point is to penetrate level to follow the unit, and its feature is that input resistance is large, and output resistance is little, has effectively solved the Signal Matching problem of output signal and next stage circuit.
More than explanation is just illustrative for the purpose of the present invention; and nonrestrictive, those of ordinary skills understand, in the situation that does not break away from the spirit and scope that claims limit; can make many modifications, variation or equivalence, but all will fall within the scope of protection of the present invention.
Claims (5)
1. a threshold circuit is characterized in that, comprise anti-phase amplifying unit and thresholding control unit and penetrate the level follow the unit, wherein,
Described anti-phase amplifying unit is used for input signal is carried out anti-phase amplification, and the input signal after the anti-phase amplification is sent to described thresholding control unit;
Described thresholding control unit is used for the input signal output of voltage after greater than the anti-phase amplification of threshold voltage.
2. threshold circuit as claimed in claim 1 is characterized in that, comprises that also penetrating level follows the unit;
Described thresholding control unit is sent to the described level of penetrating with the input signal of voltage after greater than the anti-phase amplification of threshold voltage and follows the unit.
3. threshold circuit as claimed in claim 1 or 2 is characterized in that, described anti-phase amplifying unit comprises the first operational amplifier, the first resistance, the second resistance, adjustable resistance and the first electric capacity, wherein,
Described the first resistance is connected with the inverting input of described the first operational amplifier;
The normal phase input end of described the first operational amplifier is by described the second grounding through resistance;
The output of described the first operational amplifier by described adjustable resistance parallel with one another be connected the first electric capacity and be connected with the inverting input of described operational amplifier.
4. threshold circuit as claimed in claim 3 is characterized in that, described thresholding control unit comprises the second operational amplifier, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the second electric capacity, the first diode and the second diode, wherein,
The inverting input of described the second operational amplifier is connected with the output of described the first operational amplifier by described the 3rd resistance;
The normal phase input end of described the second operational amplifier is by described the 4th grounding through resistance;
The output of described the second operational amplifier respectively with the negative pole of the positive pole of described the first diode, described the second diode be connected the first end of the second electric capacity and be connected;
The negative pole of described the first diode is connected with the inverting input of described the second operational amplifier;
The positive pole of described the second diode is followed the unit and is connected with the described level of penetrating;
The second end of described the second electric capacity is connected with the positive pole of described the second diode;
Be connected with the 5th resistance between the second end of the negative pole of described the first diode and described the second electric capacity;
Described the 6th resistance is connected with the inverting input of described the second operational amplifier;
Threshold voltage is inputted described the second operational amplifier by described the 6th resistance.
5. threshold circuit as claimed in claim 4 is characterized in that, the described level of penetrating is followed the unit and comprised the 3rd operational amplifier;
The normal phase input end of described the 3rd operational amplifier is connected with the positive pole of described the second diode;
The inverting input of described the 3rd operational amplifier is connected with the output of described the 3rd operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210100983.7A CN103368534B (en) | 2012-04-09 | 2012-04-09 | Threshold circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210100983.7A CN103368534B (en) | 2012-04-09 | 2012-04-09 | Threshold circuit |
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| CN103368534A true CN103368534A (en) | 2013-10-23 |
| CN103368534B 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 (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5712475A (en) * | 1994-11-04 | 1998-01-27 | Nec Corporation | Light receiving circuit with variable threshold circuit |
| CN1523758A (en) * | 2003-02-17 | 2004-08-25 | ������������ʽ���� | Noise wiping circuit |
| US20050045806A1 (en) * | 2003-08-25 | 2005-03-03 | Nec Compound Semiconductor Devices, Ltd. | Photoelectric current and voltage converting circuit |
| CN1681199A (en) * | 2004-02-12 | 2005-10-12 | 因芬尼昂技术股份公司 | Method and device for amplifying a reception signal |
| CN101873124A (en) * | 2010-05-24 | 2010-10-27 | 哈尔滨工程大学 | Self-adaptive threshold pulse amplified shaping circuit |
| CN202513890U (en) * | 2012-04-09 | 2012-10-31 | 北京大基康明医疗设备有限公司 | Threshold circuit |
-
2012
- 2012-04-09 CN CN201210100983.7A patent/CN103368534B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5712475A (en) * | 1994-11-04 | 1998-01-27 | Nec Corporation | Light receiving circuit with variable threshold circuit |
| CN1523758A (en) * | 2003-02-17 | 2004-08-25 | ������������ʽ���� | Noise wiping circuit |
| US20050045806A1 (en) * | 2003-08-25 | 2005-03-03 | Nec Compound Semiconductor Devices, Ltd. | Photoelectric current and voltage converting circuit |
| CN1681199A (en) * | 2004-02-12 | 2005-10-12 | 因芬尼昂技术股份公司 | Method and device for amplifying a reception signal |
| CN101873124A (en) * | 2010-05-24 | 2010-10-27 | 哈尔滨工程大学 | Self-adaptive threshold pulse amplified shaping circuit |
| 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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| CN103368534B (en) | 2016-08-24 |
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