CN108449072A - Pulse amplifying method for broad stopband II-VI group compound semiconductor detector - Google Patents
Pulse amplifying method for broad stopband II-VI group compound semiconductor detector Download PDFInfo
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- CN108449072A CN108449072A CN201711410019.3A CN201711410019A CN108449072A CN 108449072 A CN108449072 A CN 108449072A CN 201711410019 A CN201711410019 A CN 201711410019A CN 108449072 A CN108449072 A CN 108449072A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/02—Shaping pulses by amplifying
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/04—Shaping pulses by increasing duration; by decreasing duration
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/26—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being duration, interval, position, frequency, or sequence
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- Nonlinear Science (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of pulse amplifying methods for broad stopband II VI compound semiconductor detectors, include the following steps：The output signal of broad stopband II VI compound semiconductor detectors is obtained first, and the output signal is input to, impedance matching is carried out by impedance matching circuit, it is entered into band pass filter circuit again once to be filtered, only the ingredient in signal within the scope of setpoint frequency M1 is allowed to pass through；Secondly, the aforementioned signal by band-pass filter is input in pole-zero cancellation circuit, it is relatively flat at the top of voltage pulse signal at this time when making signal narrow to certain value by pole-zero cancellation circuit；Again, the signal after pole-zero cancellation circuit is input in monopole restoring circuit, then by by the filtered wave-shaping circuit of signal of monopole restoring circuit, final pulse amplifying signal is obtained after being amplified to signal using amplifying circuit.The present invention can obtain the pulse amplifying signal of the best signal-to-noise ratio of detector.
Description
Technical field
The present invention relates to the detector signal amplification sectors of semiconductor more particularly to broad stopband II-VI group compound partly to lead
The pulse amplifying method of bulk detector.
Background technology
Currently, the electrode output signal of semiconductor nuclear radiation detector crystalline material needs to put by preposition amplification and shaping
Big two processes.In traditional nuclear radiation detection electronic circuit, if carrying out energy using pel array electrode CdZnTe crystal
Spectrum detection, more detection channels numbers mean that more signal differentiation circuits and multi-channel analysis circuit, entire detection system
Pulse signal processing circuit can be very complicated and huge, so at present generally use have more inexpensive, higher signal processing
The small-volume high-speed digital processing system of rate.Digitized signal handles analytical technology by adopting shaped pulse signal number
Sample, holding and post-processing so that the circuit of high-energy radiation diagnostic system is more compact, integrated level higher.At this digital signal
Reason system biggest advantage is that have higher flexibility in temporal resolution and energy resolution ability.This means that if
Signal level is relatively low, then gate time can accordingly increase, while energy road can also be broadened to ensure better power spectrum statistical result.Such as
Fruit signal level is higher, and system will use finer energy road section to obtain higher energy resolution.But it is a lack of one kind
It is effectively used for the pulse amplifying method of broad stopband II-VI group compound semiconductor detector.
Invention content
In view of the drawbacks described above of the prior art, technical problem to be solved by the invention is to provide a kind of suppression systems to make an uproar
Sound, filter out high frequency signal noise the pulse amplifying method for broad stopband II-VI group compound semiconductor detector.
Technical solution of the present invention is as follows：A kind of pulse amplifying for broad stopband II-VI group compound semiconductor detector
Method comprising following steps：
The output signal of broad stopband II-VI group compound semiconductor detector is obtained first, and the output signal is inputted
Impedance matching is carried out to by impedance matching circuit, then is entered into band pass filter circuit and is once filtered, is only allowed
Ingredient in signal within the scope of setpoint frequency M1 passes through；Secondly, by aforementioned pole is input to by the signal of band-pass filter
In zero cancellation circuit, when making signal narrow to certain value by pole-zero cancellation circuit, compare at the top of voltage pulse signal at this time
It is flat；Again, the signal after pole-zero cancellation circuit being input in monopole restoring circuit so that signal is unipolar signal,
Then by by the filtered wave-shaping circuit of signal of monopole restoring circuit, filtering wave-shaping circuit is filtered using the quasi- Gauss of minimum grade
Wave handles signal, and parameter transformation is carried out by time factor and amplitude factor in transmittance process；To one two after transformation
Subdifferential equation is solved in the time domain, obtains the unit impulse response of Gauss formation system, carries out Fourier transformation conversion
To frequency domain response, filtering wave-shaping circuit optimum capacitance value and resistance value are obtained according to frequency response results, using amplifying circuit
Final pulse amplifying signal is obtained after being amplified to signal；It is wherein described to be filtered into shape electricity routing amplifier P2, amplifier
P3, resistance R10- resistance R19, polar capacitor C6- polar capacitor C10, diode D4- diodes D6 composition, when connection, polarity electricity
The anode of appearance C7 is connected after resistance R10 with the poles P of diode D4, cathode is connected with the output end of amplifier P2.Polarity
Capacitance C6 anode be connected with the poles P of diode D4, cathode as high-pass filtering circuit input terminal simultaneously and sound collector
It is connected, the anode of polar capacitor C9 is sequentially connected after resistance R13 and resistance R11 with the poles P of diode D4, cathode is through electricity
Be connected with the cathode of amplifier P3 after resistance R18, the cathode of polar capacitor C8 after resistance R14 with the output end phase of amplifier P2
Connection, anode are connected after resistance R12 with the cathode of amplifier P2, the poles P of the diode D5 after resistance R15 with amplification
The output end of device P2 is connected, the poles N are connected with the anode of amplifier P3, and the anode of polar capacitor C10 is after resistance R16 with two
The poles P of pole pipe D5 are connected, cathode is connected after resistance R19 with the output end of amplifier P3.The poles P of diode D6 and amplification
The output end of device P3 is connected, the poles N are connected after resistance R17 with the cathode of polar capacitor C9, the poles N of the diode D4 with
The anode of amplifier P2 is connected；The plus earth of the polar capacitor C8；The output end of the amplifier P3 is filtered as high pass
The output end of wave circuit is simultaneously connected with the SET pins of QX9910M integrated chips.
Further, the setpoint frequency M1 ranges are set as 1250HZ to 3300HZ.
Further, the bandpass filter uses RLC oscillation circuits.
Further, the impedance matching circuit uses series impedance adaptation.
Further, the monopole restoring circuit uses negative feedback baseline restorer circuit.
Further, the gain amplifying circuit uses voltage amplifier circuit.
Advantageous effect：The present invention can detector current pulse be not fluid shock signal, there is one fixed widthes
And definite shape, and pulse shaper responds by pulse signal peak value and halfwidth signal in electronic system
(FWHM) influence, amplitude output signal can change therewith, and the peak value of current pulse signal and halfwidth (FWHM) exist
Often also change at random in certain detectors, thus can also cause broadening of spectral lines.This quasi- gaussian filtering shaping amplification method
Pole-zero cancellation circuit design in design makes ray core pulse width narrow as far as possible, can reduce to the greatest extent in this way signal pile-up and
Baseline fluctuation is avoided to a certain extent.It can reduce track loss while keep the top of signal relatively flat simultaneously.This circuit
Be also prevented from signal it is excessive cause follow up amplifier saturation make distorted signals, while make signal all be unipolar signal, as possible
Eliminate the back attack phenomenon of wave tail.The present invention carries out filtering realization system twice by bandpass filter, filtering wave-shaping circuit
Noise suppressed filters out the signal noise of high frequency, makes forming waveform as close as unlimited pointed peaky pulse, so that system is obtained best
Signal-to-noise ratio.The shaping pulse period is shortened, the accumulation of detector signal and the fluctuation of baseline are reduced, improves the counting rate of circuit
Response.
Description of the drawings
Fig. 1 is the pulse for broad stopband II-VI group compound semiconductor detector that the present invention provides preferred embodiment
Amplification method flow chart；
Fig. 2 is the circuit diagram for filtering wave-shaping circuit.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples：
It is a kind of pulse amplifying method for broad stopband II-VI group compound semiconductor detector, packet as shown in Figure 1
Include following steps：
The output signal of broad stopband II-VI group compound semiconductor detector is obtained first, and the output signal is inputted
Impedance matching is carried out to by impedance matching circuit, then is entered into band pass filter circuit and is once filtered, is only allowed
Ingredient in signal within the scope of setpoint frequency M1 passes through；Secondly, by aforementioned pole is input to by the signal of band-pass filter
In zero cancellation circuit, when making signal narrow to certain value by pole-zero cancellation circuit, compare at the top of voltage pulse signal at this time
It is flat；Again, the signal after pole-zero cancellation circuit being input in monopole restoring circuit so that signal is unipolar signal,
Then by by the filtered wave-shaping circuit of signal of monopole restoring circuit, filtering wave-shaping circuit is filtered using the quasi- Gauss of minimum grade
Wave handles signal, and parameter transformation is carried out by time factor and amplitude factor in transmittance process；To one two after transformation
Subdifferential equation is solved in the time domain, obtains the unit impulse response of Gauss formation system, carries out Fourier transformation conversion
To frequency domain response, filtering wave-shaping circuit optimum capacitance value and resistance value are obtained according to frequency response results, using amplifying circuit
Final pulse amplifying signal is obtained after being amplified to signal；Above step be it is inseparable, exactly because above step
Combined use, and the present invention it was proved that can be only achieved system obtains best signal-to-noise ratio.Shorten shaping pulse week
Phase reduces the accumulation of detector signal and the fluctuation of baseline, improves the effect of the count rate response of circuit.
It is wherein described to be filtered into shape electricity routing amplifier P2, amplifier P3, resistance R10- resistance R19, the poles polar capacitor C6-
Property capacitance C10, diode D4- diodes D6 composition, when connection, the anode of polar capacitor C7 after resistance R10 with diode D4
The poles P be connected, cathode is connected with the output end of amplifier P2.The anode of polar capacitor C6 is extremely connected with the P of diode D4
Connect, cathode as high-pass filtering circuit input terminal and be connected with sound collector, polar capacitor C9 anode sequentially through electricity
Resistance R13 and resistance R11 after be connected with the poles P of diode D4, cathode is connected after resistance R18 with the cathode of amplifier P3,
The cathode of polar capacitor C8 is connected after resistance R14 with the output end of amplifier P2, anode after resistance R12 with amplifier P2
Cathode be connected, the poles P of the diode D5 are connected after resistance R15 with the output end of amplifier P2, the poles N and amplifier
The anode of P3 is connected, and the anode of polar capacitor C10 is connected after resistance R16 with the poles P of diode D5, cathode is through resistance
It is connected with the output end of amplifier P3 after R19.The poles P of diode D6 are connected with the output end of amplifier P3, the poles N are through resistance
It is connected with the cathode of polar capacitor C9 after R17, the poles N of the diode D4 are connected with the anode of amplifier P2；The pole
The plus earth of property capacitance C8；The output end of the amplifier P3 as high-pass filtering circuit output end and with QX9910M collection
It is connected at the SET pins of chip.
Preferably, the setpoint frequency M1 ranges are set as 1250HZ to 3300HZ.
Preferably, the bandpass filter uses RLC oscillation circuits.
Preferably, the impedance matching circuit uses series impedance adaptation.Impedance matching (impedance
Matching) singal source resistance is equal in magnitude with the characteristic impedance of connect transmission line and phase is identical or the characteristic resistance of transmission line
It is anti-identical as the equal in magnitude and phase of connect load impedance, be referred to as transmission line input terminal or output in impedance
With state, referred to as impedance matching.Otherwise, just referred to as impedance mismatching.Sometimes also directly it is called matching or mismatch.
The main function of signal line filter is to solve spatial electromagnetic interference problem, such as equipment is stronger to space radiation
The problems such as electromagnetic interference or equipment are sensitive to the electromagnetic interference in space.The signal line cable and power line cables being previously seen
Between the coupling phenomenon that causes conducted emission exceeded in high frequency, precisely due to the High-frequency Interference on signal wire passes through Space Coupling
It has arrived caused by power cord.It is because of a signal cable inherently efficiency very high radiation and reception this phenomenon occur
Antenna, harm caused by it are as follows：
1) very strong exceeded radiation is caused：Electromagnetic energy in cabinet induces common-mode voltage and electric current on cable, altogether
Mould electric current flows on cable, produces common mode radiation.This radiation is often the main reason for equipment generates exceeded radiation.
2) after the electromagnetic energy in equipment surrounding ambient is arrived by cable reception, common mode current is formed, is passed along conducting wire
Into cabinet, on the one hand pair circuit being directly connected to cable generates interference, is on the other hand radiated again by conducting wire, in cabinet
Other circuits (not directly with the circuit of cable connection) interfere.
3) the reason of causing shield or separation layer to be destroyed, generate this effect is also the reception to electromagnetic wave of cable
It radiates again, electromagnetic energy is caused to be leaked by cable, the shield effectiveness for from phenomenon being exactly shield will be low.
Theoretical and experiment shows：Cable in equipment is link most weak on electromagnetic compatibility.Signal line filter
Effect is exactly in terms of solving the problems, such as above three.Following conclusion is highly important：
Any conducting wire or cable across shield or slider can all destroy original shield effectiveness and isolation effect, right
These conducting wires, it is necessary to take filtering measures.
Signal line filter is based on common mode filtering.This is because the electric current incuded on cable is typically all common mode form,
And the difference mode signal to being transmitted on signal cable, it is desirable to have no effect.
Preferably, the monopole restoring circuit uses negative feedback baseline restorer circuit.This is also an innovative point, is usually related to
And it is to use CDD base line restorers or CD base line restorers, but its data processing precision is poor, but it is to be easiest to realize
, but it causes its anti-interference poor, and present invention employs negative feedback baseline restorers due to not having feedback mechanism
Circuit can be adjusted in real time by negative-feedback, prevent from interfering.The present invention can anti-stop signal be excessive causes subsequently to amplify
Device saturation makes distorted signals, while it is unipolar signal to make signal all, eliminates the back attack phenomenon of wave tail as possible.
Preferably, the gain amplifying circuit uses voltage amplifier circuit.Above with respect to bandpass filter, impedance matching electricity
Road, negative feedback baseline restorer circuit, voltage amplifier circuit are all made of common circuit in existing literature, and details are not described herein.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be in the protection domain being defined in the patent claims.
Claims (6)
1. a kind of pulse amplifying method for broad stopband II-VI group compound semiconductor detector, which is characterized in that including with
Lower step：
The output signal of broad stopband II-VI group compound semiconductor detector is obtained first, and the output signal is input to logical
It crosses impedance matching circuit and carries out impedance matching, then be entered into band pass filter circuit and once filtered, only allow signal
Ingredient within the scope of middle setpoint frequency M1 passes through；Secondly, the aforementioned signal by band-pass filter is input to zero phase of pole
It is relatively flat at the top of voltage pulse signal at this time when making signal narrow to certain value by pole-zero cancellation circuit in electric eliminating road；
Again, the signal after pole-zero cancellation circuit is input in monopole restoring circuit so that signal is unipolar signal, then will
By the filtered wave-shaping circuit of the signal of monopole restoring circuit, filtering wave-shaping circuit is using the quasi- gaussian filtering of minimum grade to letter
It number is handled, passes through time factor in transmittance process and amplitude factor carries out parameter transformation；To a second differential after transformation
Equation is solved in the time domain, obtains the unit impulse response of Gauss formation system, is carried out Fourier transformation and is transformed into frequency domain
Response obtains filtering wave-shaping circuit optimum capacitance value and resistance value, using amplifying circuit to signal according to frequency response results
Final pulse amplifying signal is obtained after being amplified；It is wherein described to be filtered into shape electricity routing amplifier P2, amplifier P3, resistance
R10- resistance R19, polar capacitor C6- polar capacitor C10, diode D4- diodes D6 composition, when connection, polar capacitor C7's
Anode is connected after resistance R10 with the poles P of diode D4, cathode is connected with the output end of amplifier P2.Polar capacitor C6
Anode be connected with the poles P of diode D4, cathode as high-pass filtering circuit input terminal and be connected with sound collector,
The anode of polar capacitor C9 is sequentially connected after resistance R13 and resistance R11 with the poles P of diode D4, cathode is after resistance R18
It is connected with the cathode of amplifier P3, the cathode of polar capacitor C8 is connected after resistance R14 with the output end of amplifier P2, just
Pole is connected after resistance R12 with the cathode of amplifier P2, and the poles P of the diode D5 are after resistance R15 with amplifier P2's
Output end is connected, the poles N are connected with the anode of amplifier P3, polar capacitor C10 anode after resistance R16 with diode D5
The poles P be connected, cathode is connected after resistance R19 with the output end of amplifier P3, the poles P of diode D6 are with amplifier P3's
Output end is connected, the poles N are connected after resistance R17 with the cathode of polar capacitor C9, the poles N of the diode D4 and amplifier
The anode of P2 is connected；The plus earth of the polar capacitor C8；The output end of the amplifier P3 is as high-pass filtering circuit
Output end and be connected with the SET pins of QX9910M integrated chips.
2. the pulse amplifying method according to claim 1 for broad stopband II-VI group compound semiconductor detector,
It is characterized in that, the setpoint frequency M1 ranges are set as 1250HZ to 3300HZ.
3. the pulse amplifying method according to claim 1 for broad stopband II-VI group compound semiconductor detector,
It is characterized in that, the bandpass filter uses RLC oscillation circuits.
4. the pulse amplifying method according to claim 1 for broad stopband II-VI group compound semiconductor detector,
It is characterized in that, the impedance matching circuit uses series impedance adaptation.
5. the pulse amplifying method according to claim 1 for broad stopband II-VI group compound semiconductor detector,
It is characterized in that, the monopole restoring circuit uses negative feedback baseline restorer circuit.
6. the pulse amplifying method according to claim 1 for broad stopband II-VI group compound semiconductor detector,
It is characterized in that, the gain amplifying circuit uses voltage amplifier circuit.
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| CN201711410019.3A CN108449072A (en) | 2017-12-23 | 2017-12-23 | Pulse amplifying method for broad stopband II-VI group compound semiconductor detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108155893A (en) * | 2017-12-23 | 2018-06-12 | 黄仕权 | For the pulse signal amplification method of wide bandgap semiconductor detector |
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Application publication date: 20180824 |