CN102751955A - Preamplifier for rapid spot size measurement - Google Patents
Preamplifier for rapid spot size measurement Download PDFInfo
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- CN102751955A CN102751955A CN201210228166XA CN201210228166A CN102751955A CN 102751955 A CN102751955 A CN 102751955A CN 201210228166X A CN201210228166X A CN 201210228166XA CN 201210228166 A CN201210228166 A CN 201210228166A CN 102751955 A CN102751955 A CN 102751955A
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- preamplifier
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Abstract
The invention provides a preamplifier for rapid spot size measurement. The preamplifier comprises a sampling resistor used for finishing the conversion of current and voltage, a voltage feedback operational amplifier module with big gain and high bandwidth at a first stage, a current feedback operational amplifier module with small gain, high bandwidth and high slew rate connected at a second stage, and a proper resistor connected between two operational amplifier modules. Meanwhile, the preamplifier comprises the following parts: input impedance matching, power supply rectification and filter, operational negative feedback network, external frequency compensation, output top matching and the like. Multiple same and independent circuits can be designed to treat multiple paths of outputs of multi-anode photomultiplier tubes (MaPMT). According to the invention, the characteristics of different kinds of manure operational amplifiers in the prior art are brought into full play, and a voltage feedback integrated operational amplifier (AD8099) is adopted in the first-stage gain. Through an external compensation circuit and a feedback network circuit, 10 times of gain can be realized and the noise is low so that interesting high-frequency signals can be amplified while noise interference is avoided.
Description
Technical field
The present invention relates to a kind of quick hot spot measuring technique, preamplifier during particularly a kind of quick optical spot size is measured is applied in bundle group lateral dimension measurement fast in the accelerator.
Background technology
In the beam diagnostics field; Multi-anode photomultiplier (MaPMT) is being played an important role in the bundle group lateral dimension diagnostic techniques fast; It has the response time that is exceedingly fast and high sensitivity, therefore wherein preposition signal reading system is also required high performance index.Be directed against reading in the circuit of MaPMT at present, like the SIB016PMT sensor interface board that U.S. Vertilon company produces, the performance of its circuit and bandwidth have satisfied not the quick bundle in the accelerator far away and have rolled into a ball the requirement of pursuing bundle group resolution of measuring.For this reason, need characteristic, develop a kind of high performance quick preamplifier circuit, realize measuring of bundle group lateral dimension fast by bundle group to preceding end detector MaPMT.
Summary of the invention
The present invention is a kind of quick preamplifier of design; Its objective is the output low current signal of amplification from multi-anode photomultiplier (MaPMT); Under the prerequisite that does not influence its fast response characteristic; Improve the signal to noise ratio and the signal swing rate of output current pulse signal as far as possible, keep waveform integrality by bundle group response signal.
The technical scheme that the present invention adopts is: preamplifier during a kind of quick optical spot size is measured; This preamplifier of low current signal input from front end MaPMT output; This preamplifier transforms through current/voltage, first order gain and second level gain back output;
Because signal is after the output of MaPMT anode; The first order gain that the 0.8D-QEV coaxial cable of through characteristic impedance 50 Ω transfers to this preamplifier is the normal phase input end of Voltage Feedback type integrated operational amplifier AD8099; The normal phase input end of this operational amplifier A of sample resistance R1 one termination D8099; Sample resistance R1 other end ground connection, the resistance of sample resistance R1 is set to 50 Ω;
The normal phase input end of operational amplifier A D8099 has the internal resistance of approach infinity; Therefore can be from the voltage sampling on the sample resistance R1; Output and the negative-phase input of negative feedback network resistance R 2 and R3 concatenation operation amplifier AD8099, the closed loop gain of formation is: (1+R3/R2); Capacitor C 1 is connected in parallel on the resistance R 3, and its high-frequency signal to feedback carries out phase compensation, simultaneously, external compensation network capacitance C2 is arranged also, and adjustment realizes the optimization of gain and bandwidth;
The amplifier of second level gain is LMH6702, connects with suitable resistance R 4 between the two-stage, avoids the excessive circuit oscillation that possibly cause of Q value; The output of the normal phase input end concatenation operation amplifier AD8099 of LMH6702, negative feedback network resistance R 6 is connected output and the negative-phase input of LMH6702 with R7, and the closed loop gain of formation is: (1+R7/R6);
The resistance R 5 of LMH6702 output connects outside output transmission line, forms output top coupling, has eliminated the vibration that every road signal cross-talk causes;
The power pin of operational amplifier A D8099 and LMH6702 all parallel connection shunt capacitance, for the high speed electric current of amplifier provides low impedance path;
Whole preamplifier circuit is operated in ± 5V source of stable pressure condition under, the power input of source of stable pressure also need be introduced filter network, to reduce power supply ripple the influence and the power supply of amplifier power supply is crosstalked.
Further, the every road output in the multichannel of multi-anode photomultiplier all utilizes this preamplifier to handle.
Principle of the present invention is:
The present invention utilize the design multichannel identical and independently circuit to the multichannel of multi-anode photomultiplier (MaPMT) output handle.Each road circuit comprises the conversion of small resistor completion electric current and voltage; The Voltage Feedback operational amplifier module of the big gain high bandwidth of the first order; The operating amplifier with current feedback module that connects partial little gain high bandwidth high pressure swing rate connects appropriate resistance between the two stage amplifer.Parts such as input impedance matching, power supply rectification filter, amplifier negative feedback network, foreign frequency compensation and output top coupling have also been comprised simultaneously.
Advantage of the present invention and good effect are:
1, the present invention gives full play to existing ripe dissimilar operational amplifier characteristics, and Voltage Feedback type integrated operational amplifier AD8099 is adopted in first order gain.Through external compensation circuit and feedback network circuit, can 10 times of high-gains of reality, low noise characteristic is arranged simultaneously, therefore can amplify interested high-frequency signal to avoid noise jamming simultaneously.
2, second level amplifier LMH6702 of the present invention is a current feedback property operational amplifier, has the function of high pressure swing rate and high bandwidth, behind the reception prime output signal, and output driving loads after the realization 2 multiplication benefits.
3, entire circuit of the present invention has response time of being exceedingly fast and near the three dB bandwidth of 600MHz, can reduce as much as possible from the high frequency loss of the waveform of MaPMT output, keeps the complete undistorted of waveform.
When 4, the present invention simulation is by bundle group input signal, can be to the signal amplification that gains fully, the rise time that is exceedingly fast makes do not have overlappingly between each adjacent signals, keeps the independent completion of each pulse, can satisfy the index request of practical application.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the Frequency and Amplitude characteristic of side circuit test;
Fig. 3 is the actual waveform figure that simulation obtains by bundle group signal measurement;
Fig. 4 is a preamplifier circuit schematic diagram during quick optical spot size of the present invention is measured.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
Preamplifier theory diagram during quick optical spot size as shown in Figure 1 is measured; In hot spot bundle group lateral dimension is measured fast; Import from preamplifier from the low current signal of front end MaPMT output, transform, export behind one-level gaining structure and the secondary gaining structure through current/voltage.
Entire circuit is operated in ± 5V source of stable pressure condition under, power input also need be introduced filter network, to reduce power supply ripple the influence and the power supply of amplifier power supply is crosstalked.
Because signal is after the output of MaPMT anode, (characteristic impedance 50 Ω) transfer to preamplifier through the 0.8D-QEV coaxial cable, need do impedance matching to input, and the vibration of avoiding end reflection to cause is so the resistance of sample resistance R1 is set to 50 Ω.As shown in Figure 4, simultaneously, sample resistance R1 also plays a part to convert the MaPMT current impulse into potential pulse.
Voltage Feedback type integrated operational amplifier AD8099 is adopted in first order gain.The normal phase input end of amplifier has the internal resistance of approach infinity, therefore can be from the voltage sampling on the sample resistance R1.Negative feedback network R2 is connected the output and the negative-phase input of amplifier with R3, the closed loop gain of formation is (1+R3/R2).C1 is connected in parallel on the R3, can carry out phase compensation to the high-frequency signal of feedback, simultaneously, external compensation network C 2 is arranged also, can adjust the optimization that realizes gain and bandwidth.
Second level amplifier is LMH6702, connects with suitable resistance R 4 between the two-stage, can avoid the excessive circuit oscillation that possibly cause of Q value.The normal phase input end of LMH6702 connects the output of the first order, and negative feedback network R6 is connected the output and the negative-phase input of amplifier with R7, and the closed loop gain of formation is (1+R7/R6).
The resistance R 5 of output connects internal amplifier and outside output transmission line, forms output top coupling, has also eliminated the vibration that four road signal cross-talks cause simultaneously.Shunt capacitance that the power pin of each chip is all parallelly connected, the high speed electric current that can be amplifier provides low impedance path.
Fig. 2 is that reality changes R1 end input sine wave waveform frequency successively, keeps input range constant simultaneously, the output of measure R 5, and AgilentDSO9104A takes multiple measurements with measuring instrument, the Frequency and Amplitude curve that obtains measuring.
Fig. 3 is at the signal of sample resistance R1 end input analogue accelerator by bundle group, the impulse waveform independently mutually that obtains at the output of R5.
The technology contents that the present invention does not set forth in detail belongs to those skilled in the art's known technology.
Although above the illustrative embodiment of the present invention is described; So that the technical staff of present technique neck understands the present invention, but should be clear, the invention is not restricted to the scope of embodiment; To those skilled in the art; As long as various variations appended claim limit and the spirit and scope of the present invention confirmed in, these variations are conspicuous, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (2)
1. preamplifier during a quick optical spot size is measured is characterized in that: from this preamplifier of low current signal input of front end MaPMT output, this preamplifier transforms through current/voltage, first order gain and second level gain back output;
Because signal is after the output of MaPMT anode; The first order gain that the 0.8D-QEV coaxial cable of through characteristic impedance 50 Ω transfers to this preamplifier is the normal phase input end of Voltage Feedback type integrated operational amplifier AD8099; The normal phase input end of this operational amplifier A of sample resistance R1 one termination D8099; Sample resistance R1 other end ground connection, the resistance of sample resistance R1 is set to 50 Ω;
The normal phase input end of operational amplifier A D8099 has the internal resistance of approach infinity; Voltage sampling from the sample resistance R1; Output and the negative-phase input of negative feedback network resistance R 2 and R3 concatenation operation amplifier AD8099, the closed loop gain of formation is: 1+R3/R2; Capacitor C 1 is connected in parallel on the resistance R 3, and its high-frequency signal to feedback carries out phase compensation, simultaneously, external compensation network capacitance C2 is arranged also, and adjustment realizes the optimization of gain and bandwidth;
The amplifier of second level gain is LMH6702, connects with suitable resistance R 4 between the two-stage, avoids the excessive circuit oscillation that possibly cause of Q value; The output of the normal phase input end concatenation operation amplifier AD8099 of LMH6702, negative feedback network resistance R 6 is connected output and the negative-phase input of LMH6702 with R7, and the closed loop gain of formation is: 1+R7/R6;
The resistance R 5 of LMH6702 output connects outside output transmission line, forms output top coupling, has also eliminated the vibration that every road signal cross-talk causes simultaneously;
The power pin of operational amplifier A D8099 and LMH6702 all parallel connection shunt capacitance, for the high speed electric current of amplifier provides low impedance path;
Whole preamplifier circuit is operated in ± 5V source of stable pressure condition under, the power input of source of stable pressure also need be introduced filter network, to reduce power supply ripple the influence and the power supply of amplifier power supply is crosstalked.
2. preamplifier during a kind of quick optical spot size according to claim 1 is measured is characterized in that: the every road output in the multichannel of multi-anode photomultiplier all utilizes this preamplifier to handle.
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| CN201210228166XA CN102751955A (en) | 2012-07-03 | 2012-07-03 | Preamplifier for rapid spot size measurement |
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| CN201210228166XA CN102751955A (en) | 2012-07-03 | 2012-07-03 | Preamplifier for rapid spot size measurement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260773A (en) * | 2019-05-22 | 2019-09-20 | 北京清科电子有限责任公司 | A kind of preposition conditioning device of the current vortex sensor of Low Drift Temperature |
| CN111900942A (en) * | 2020-08-03 | 2020-11-06 | 河南大学 | Audio amplifier based on optical sensing technology |
| CN113467320A (en) * | 2021-07-21 | 2021-10-01 | 西安龙飞电气技术有限公司 | Weak signal detection algorithm based on gain compensation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2004053472A1 (en) * | 2002-12-10 | 2004-06-24 | Commonwealth Scientific And Industrial Research Organisation A Body Corporate Established Under The Science And Industry Research Act 1949, As Amended, Carring On Scientific And Industrial Research | Radiographic equipment |
| CN201311402Y (en) * | 2008-12-13 | 2009-09-16 | 丁厚本 | Portable super-fast visual contraband detector structure |
| CN202663362U (en) * | 2012-07-03 | 2013-01-09 | 中国科学技术大学 | Preamplifier for rapid spot size measurement |
-
2012
- 2012-07-03 CN CN201210228166XA patent/CN102751955A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004053472A1 (en) * | 2002-12-10 | 2004-06-24 | Commonwealth Scientific And Industrial Research Organisation A Body Corporate Established Under The Science And Industry Research Act 1949, As Amended, Carring On Scientific And Industrial Research | Radiographic equipment |
| CN201311402Y (en) * | 2008-12-13 | 2009-09-16 | 丁厚本 | Portable super-fast visual contraband detector structure |
| CN202663362U (en) * | 2012-07-03 | 2013-01-09 | 中国科学技术大学 | Preamplifier for rapid spot size measurement |
Non-Patent Citations (2)
| Title |
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| M.A. LEIGUI DE OLIVEIRA等: "Atmospheric Radiation Monitor", 《PROCEEDINGS OF SCIENCE》 * |
| 兰吉昌: "《运算放大器集成电路手册》", 31 August 2006, 化学工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260773A (en) * | 2019-05-22 | 2019-09-20 | 北京清科电子有限责任公司 | A kind of preposition conditioning device of the current vortex sensor of Low Drift Temperature |
| CN111900942A (en) * | 2020-08-03 | 2020-11-06 | 河南大学 | Audio amplifier based on optical sensing technology |
| CN113467320A (en) * | 2021-07-21 | 2021-10-01 | 西安龙飞电气技术有限公司 | Weak signal detection algorithm based on gain compensation |
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Application publication date: 20121024 |