CN2487155Y - Photoelectric multiplexing tube weak pulse signal processing circuit - Google Patents
Photoelectric multiplexing tube weak pulse signal processing circuit Download PDFInfo
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- CN2487155Y CN2487155Y CN 01248664 CN01248664U CN2487155Y CN 2487155 Y CN2487155 Y CN 2487155Y CN 01248664 CN01248664 CN 01248664 CN 01248664 U CN01248664 U CN 01248664U CN 2487155 Y CN2487155 Y CN 2487155Y
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- resistance
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- triode
- frequency
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- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The utility model discloses a photoelectric multiplexing tube weak pulse signal processing circuit, a photoelectric multiplexing tube weak signal processing circuit, comprising a wideband amplifier, an operational amplifier, a shaping filter circuit and a frequency divider, which is characterized in that: the wideband amplifier consists of a triode U<1> and a peripheral element; the operational amplifier comprises a comparator U<2> and a peripheral element resistor, etc.; the shaping filter circuit consists of a comparator U<3>, a peripheral element resistor and a peripheral element capacitors; the frequency divider consists of an integrated circuit U<4> and an peripheral element R <15>. The circuit can stably work under the high frequency region without any vibration. The utility model has the advantages of relatively stable operating frequency, relatively wide frequency range, low distortion, high signal-to-noise ratio (SNR) and low cost, etc., thereby being suitable for check, frequency counting and signal comparison, etc. of the weak pulse signal.
Description
Technical field
The utility model is a kind of pulse signal treatment circuit, belongs to the electroporation field.
Background technology
As everyone knows, there are the problems such as unstable, that frequency range is narrow of handling in the processing of the small-signal of high frequency.Especially higher in noise signal, handle the vibration situation that occurs easily when frequency is higher.Because existing this respect treatment circuit majority is based on single integrated transporting discharging, can not avoid the situation of above-mentioned appearance well.And, cause situations such as signal processing is not proper because of signal to noise ratio is not high.
Summary of the invention
The utility model discloses a kind of photomultiplier Weak pulse signal treatment circuit, a kind of photomultiplier small-signal treatment circuit, and its composition comprises: receive the triode wide-band amplifier from the small-signal of photomultiplier; Operational amplifier; Plastic filter circuit and frequency divider is characterized in that:
A, described wide-band amplifier are by triode U
1Form resistance R with its peripheral cell
1, R
2, R
3, R
4, R
5Be triode U
1Quiescent point resistance is connected to resistance R
2With with resistance R
2, R
1Be serially connected with triode U
1Inductance L between collector junction
1Make high frequency compensation, be connected to resistance R
4One high frequency compensation capacitor C is arranged
2, resistance R
5Be connected in series decoupling inductor L with positive source
2, resistance R
5With inductance L
2String one coupling electric capacity between node and the ground;
B, described operational amplifier are by comparator U
2With its peripheral cell resistance R
6, R
7, R
8, R
9, R
12, R
13, R
14And inductance L
3And capacitor C
3, C
4Constitute.
C, described plastic filter circuit are by comparator U
3With the peripheral cell resistance R
10, potentiometer R
11, capacitor C
3, timely two ground capacities and inductance L
3Form.
D, described frequency divider are by integrated circuit U
4And peripheral cell R
15Constitute.
Preposition broadband amplifiers is a transistor amplifier, inductance L 1, capacitor C 1 are respectively the high frequency compensation inductance and the electric capacity that can change bandwidth, and resistance R 1, R2, R3, R4, R5 determine the U1 quiescent point, resistance R 1 and R4 spread bandwidth, electric capacity c2 is a high frequency compensation electric capacity.Preposition broadband amplifiers U1 adopts the triode of low noise, impedance and photoelectric tube coupling.Operational amplifier is a discharge circuit, and resistance R 6, R8 change multiplication factor.
The faint non-regular pulses signal by the output of devices such as photomultiplier is handled in the utility model special use, is particularly useful for the detection of high frequency, ultra-high frequency signal.When want detection signal when being operated in high frequency and high-noise environment condition, avoid producing concussion during to the effective processing and amplifying of signal, high frequency.Based on above purpose, in the design circuit process, take all factors into consideration the characteristic of electronic component and have integrated chip function, performance now.Guarantee the correct processing of signal, adopt the two poles of the earth to amplify mode.The wideband that constitutes with triode and peripheral circuit is enlarged into elementary amplification.Overcome and amplified the shortcoming that index can't meet the demands in the available circuit.
The high frequency discrete signal be input to by triode U1 constitute the broadband amplifiers greater than 1GHz carry out preposition amplification, adjust the working point that peripheral Resistor-Capacitor Unit is determined crest frequency, reduce the noise of input signal.Through the signal of preamplifier output selecting suitable gain bandwidth product, so that the amplitude of signal reaches required value by main amplifier U2.Signal is screened through U3 single window type or double window type again, selects the signal amplitude that meets the demands.Shaping circuit U4 is output as TTL calibration pulse signal.
What the experiment proved that this circuit can be stable is operated in high frequency region and does not produce concussion.Merely based on integrated operational amplifier circuit, can't reach requirement in the existing Weak pulse signal treatment circuit at the high frequency steady operation at all.Especially in the processing of broadband signal, working point dynamic range no-load voltage ratio is difficult to satisfy when big especially.It is the elementary wideband amplifying circuit at center with the triode that this circuit has increased, and it is more stable to have operating frequency, frequency range broad, low distortion, high s/n ratio, outstanding features such as low cost.Can be used for the detection of Weak pulse signal, frequency counting, signal the aspect such as relatively.Detect as chemical industry, geological analysis, biochemistry, medical and health, environmental monitorings etc. are handled the small-signal of front end input.Has range of application very widely, very high practical value.
Description of drawings
Fig. 1 is the utility model embodiment electrical schematic diagram;
Embodiment:
The main effect of this circuit is to be used with photomultiplier, will be converted into the corresponding signal of telecommunication by the variation of photometry.Generally speaking, photoelectricity passes and increases the direct current that pipe is output as pulsation, and its mean value changes with light intensity, and can adopt the way of lining average to measure light intensity indirectly this moment.But when incident light was very faint, photomultiplier was output as the pulse electric current, as still adopting the way of lining average, then its output is affected by noise serious, can not reflect intensity variations truly, and at this moment must adopt the pulse notation, reflect intensity variations with pulse frequency.This circuit designs for measuring faint light exactly.By the function branch, circuit is partly formed i.e.: amplification, shaping filter, frequency division by three.Because the photomultiplier output signal is more weak and frequency is very high, so, except finishing enlarging function, also must consider impedance matching and noise problem for amplifying stage, these two problems solve bad, with the linear relationship that directly influences between tested light intensity and the pulse frequency.Based on this kind consideration, the first order has adopted transistor amplifier in the circuit, because transistor amplifier has the electric current amplification, so the current-to-voltage converting circuit that need not add, can directly be connected, be easy to satisfy the requirement of impedance and noise with the photomultiplier output.Signal can satisfy amplitude requirement again after discharge circuit amplifies, change R6, R8 and can change multiplication factor.Shaping filter is finished by the U3 comparator, can remove the lower noise pulse of amplitude by the size that changes inverting input voltage.Frequency divider is finished by U4.The first order is typical wideband amplification circuit, and its bandwidth can reach 1GHz, and gain is about 10dB, and its input impedance is 75 ohm.L1, C1 are respectively high frequency compensation inductance and electric capacity, adjust its big I and change bandwidth, and R1, R2, R3, R4, R5 have determined quiescent point, and R1 and R4 also play spread bandwidth simultaneously, and C2 is a high frequency compensation electric capacity.Because the first order adopts the low noise triode, has improved signal to noise ratio greatly, the also easy and photomultiplier coupling of impedance simultaneously.Directly adopt operational amplifier to amplify, the operational amplifier impedance is higher because the photoelectric tube impedance is lower, and desire realizes that coupling has only the resistance of employing to realize between the two, will reduce the ratio of doubly making an uproar like this.L2, C4 are the lotus root elements.R6, R8, U1, R9 constitute the second level and amplify, and the effect of R7 is the input impedance of adjusting second level amplifier, and itself and prime are complementary, and avoiding high-frequency signal to shake subsequent repeatedly is comparator and frequency divider.
Claims (1)
1. photomultiplier small-signal treatment circuit, its composition comprises: receive the triode wide-band amplifier from the small-signal of photomultiplier; Operational amplifier; List/double window type discriminator U
3And frequency divider, it is characterized in that:
A, described wide-band amplifier are by triode U
1Form resistance R with its peripheral cell
1, R
2, R
3, R
4, R
5Be triode U
1Quiescent point resistance is connected to resistance R
2With with resistance R
2, R
1Be serially connected with triode U
1Inductance L between collector junction
1Make high frequency compensation, be connected to resistance R
4One high frequency compensation capacitor C is arranged
2, resistance R
5Be connected in series decoupling inductor L with positive source
2, resistance R
5With inductance L
2String one coupling electric capacity between node and the ground;
B, described operational amplifier are by comparator U
2With its peripheral cell resistance R
6, R
7, R
8, R
9, R
12, R
13, R
14And inductance L
3And capacitor C
3, C
4Constitute.
C, described plastic filter circuit are by comparator U
3With the peripheral cell resistance R
10, potentiometer R
11, capacitor C
3, timely two ground capacities and inductance L
3Form.
D, described frequency divider are by integrated circuit U
4And peripheral cell R
15Constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01248664 CN2487155Y (en) | 2001-07-12 | 2001-07-12 | Photoelectric multiplexing tube weak pulse signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01248664 CN2487155Y (en) | 2001-07-12 | 2001-07-12 | Photoelectric multiplexing tube weak pulse signal processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2487155Y true CN2487155Y (en) | 2002-04-17 |
Family
ID=33659250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01248664 Expired - Fee Related CN2487155Y (en) | 2001-07-12 | 2001-07-12 | Photoelectric multiplexing tube weak pulse signal processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2487155Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820858A (en) * | 2012-07-31 | 2012-12-12 | 赵烨梁 | High-frequency signal amplifying circuit for scanning tunnel microscope |
-
2001
- 2001-07-12 CN CN 01248664 patent/CN2487155Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820858A (en) * | 2012-07-31 | 2012-12-12 | 赵烨梁 | High-frequency signal amplifying circuit for scanning tunnel microscope |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |