CN205453650U - A extremely narrow impulse generator of ultra wide band for radar detection system - Google Patents
A extremely narrow impulse generator of ultra wide band for radar detection system Download PDFInfo
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- CN205453650U CN205453650U CN201620273963.3U CN201620273963U CN205453650U CN 205453650 U CN205453650 U CN 205453650U CN 201620273963 U CN201620273963 U CN 201620273963U CN 205453650 U CN205453650 U CN 205453650U
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- 238000005086 pumping Methods 0.000 claims description 9
- 238000005457 optimization Methods 0.000 claims description 4
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- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The utility model discloses an extremely narrow impulse generator of ultra wide band for radar detection system, optimize circuit, second grade avalanche transistor and pulse shaper including trigger circuit, the source of triggering, the input of optimizing the circuit in the source of triggering is connected to trigger circuit's output, the projecting pole of the output connection second grade avalanche transistor of circuit is optimized in the source of triggering, DC power supply connects the base earth of the collecting electrode of second grade avalanche transistor, second grade avalanche transistor, the collecting electrode of second grade avalanche transistor, output connected load are connected to the input of pulse shaper. Impulse generator, the pulse that takes place, the range is great, the ring is less, the wave form is symmetrical, is applicable to UWB radar detection system. The utility model discloses circuit structure is simple, and low cost is suitable for extensive popularization and application.
Description
Technical field
This utility model UWB radar field of detecting, is specifically related to a kind of ultra broadband ultra-narrow pulse generator for radar-probing system based on avalanche effect.
Background technology
UWB (UltraWideband, impulse radio) technology need not carrier wave, and by directly transmitting, transmit and receive nanosecond, subnanosecond level ultra-narrow pulse carries out information transmission or target acquisition etc..In view of the advantage that UWB pulse width is the narrowest, temporal resolution is higher, UWB technology has a good application prospect in radar detection field.Transceiver is the ingredient that UWB system is most basic, and wherein, the generation of high speed ultra-narrow pulse is the precondition of UWB technology.In radar-probing system, require that the pulse sent has enough peak powers, in order to realize transmitting more at a distance, require to send simultaneously pulse have suitable waveform, good before and after along, high repetition frequency, and generation circuit volume is little, simple in construction, it is easy to accomplish.
At present, the method producing UWB pulse signal has a variety of, and the core of circuit is some high-speed switching devices mostly, and the performance of its pulse produced is inevitable relevant with the high speed device used in circuit.Generally can produce nanosecond, the high-speed switching devices of picosecond pulse has: tunnel diode, avalanche transistor, step-recovery diode etc..Wherein, utilize the avalanche effect of avalanche transistor can produce amplitude be a few volt, pulse width be the high speed UWB pulse of tens psecs, pulse amplitude is big, meets the application demand of radar-probing system.
Fig. 1 is UWB pulse-generator circuit schematic diagram based on avalanche effect in prior art.As it is shown in figure 1, such as when pumping signal not yet arrives, the base stage reverse bias of transistor Q, it is in cut-off state, between colelctor electrode and emitter stage, there is highfield, storage capacitor C2 charges, and after entering stable state, both end voltage is about Vcc.After a sufficiently large driving pulse arrives, transistor Q operating point moves to the snowslide negative impedance region of instability, transistor Q avalanche breakdown, produce the avalanche current quickly increased, cause electric capacity C2 through transistor Q and load resistance RL repid discharge, thus on load resistance RL formed a narrower negative pulse.
Although above-mentioned UWB pulse-generating circuit based on avalanche effect output pulse can substantially meet the requirement of UWB system, but its waveform ring is more serious, is reflected on frequency domain, then narrower bandwidth, and the application in radar detection field has limitation.
Utility model content
For the deficiencies in the prior art, the utility model discloses a kind of ultra broadband ultra-narrow pulse generator for radar-probing system.
The technical solution of the utility model is as follows:
A kind of ultra broadband ultra-narrow pulse generator for radar-probing system, including triggering circuit, trigger source optimization circuit, two grades of avalanche transistors and pulse former；
The outfan triggering circuit connects the input of trigger source optimization circuit；Trigger source optimizes circuit and includes RC peaker, avalanche transistor, the second electric capacity, the second resistance and the 3rd resistance；The input of RC peaker is the input that trigger source optimizes circuit；Avalanche transistor is NPN type, and its base stage connects the outfan of RC peaker, grounded emitter, and colelctor electrode connects DC source by the second resistance；Second electric capacity and the 3rd resistant series, in this series circuit, one end of the second electric capacity is connected to the common port of the second resistance and avalanche transistor, one end ground connection of the 3rd resistance；The common port of the second electric capacity and the 3rd resistance is the outfan that trigger source optimizes circuit；Two grades of avalanche transistors are NPN type；Trigger source optimizes the emitter stage of outfan two grades of avalanche transistors of connection of circuit；DC source connects the colelctor electrode of two grades of avalanche transistors, the base earth of two grades of avalanche transistors；The input of pulse former connects the colelctor electrode of two grades of avalanche transistors, and outfan connects load.
Its further technical scheme is: also include that pulse shaper, described pulse shaper are connected between the colelctor electrode of DC source and two grades of avalanche transistors.
Its further technical scheme is: described pulse shaper is inductance, and two ends connect DC source and the colelctor electrode of two grades of avalanche transistors respectively.
Its further technical scheme is: described RC peaker includes the first electric capacity and the first resistance；First electric capacity and the first resistant series, these series circuit two ends are the input of RC peaker；First resistance two ends are RC peaker outfan.
Its further technical scheme is: described pulse former is the 3rd electric capacity, and two ends connect colelctor electrode and the load of two grades of avalanche transistors respectively.
Its further technical scheme is: the model of avalanche transistor and two grades of avalanche transistors is BFP450, and when current collection extremely 4.5～15V, it works in avalanche region.
Its further technical scheme is: described triggering circuit be model be the random waveform maker of Tektronix, to provide the frequency TTL pumping signal as 20MHz；The model of described DC source is GWInstek, to provide 12V DC source；Also include the oscillograph that model is AgilentDS081204A, to observe output pulse；Being that Model310CUWB electromagnetic horn is transmitted by model between load end and the oscillograph of ultra broadband ultra-narrow pulse generator, its input and outfan all use sub-miniature A connector.
Advantageous Effects of the present utility model is:
Pulse generator described in the utility model, the pulse occurred, amplitude is relatively big, ring is less, waveform symmetry, it is adaptable to UWB radar detection system.
This utility model circuit structure is simple, with low cost, is suitable to wide popularization and application.
Accompanying drawing explanation
Fig. 1 is UWB pulse-generator circuit schematic diagram based on avalanche effect in prior art.
Fig. 2 is avalanche transistor output characteristics figure.
Fig. 3 is structural representation of the present utility model.
Fig. 4 is circuit theory diagrams of the present utility model.
Fig. 5 be model be BFP450 avalanche transistor schematic symbol diagram in ADS.
Fig. 6 is the simulation result comparison diagram of this utility model and UWB pulse-generating circuit output waveform of the prior art.
Fig. 7 is the structured flowchart of transmitting-receiving test circuit of the present utility model.
Fig. 8-a is transmitting signal schematic representation of the present utility model.
Fig. 8-b is that oscillograph of the present utility model receives signal schematic representation.
Detailed description of the invention
Fig. 2 is avalanche transistor output characteristics figure.The avalanche diode mentioned in this utility model and two grades of avalanche diodes, be all based on the characteristic work shown in Fig. 2.As in figure 2 it is shown, the avalanche breakdown phenomenon of avalanche transistor is: when the collector voltage of avalanche transistor is the highest, when space-charge region internal electric field is sufficiently strong, thermally generated carriers can produce avalanche multiplication effect when by forceful electric power place.Then reverse current can increase sharply with backward voltage, and avalanche breakdown occurs.
Fig. 3 is structural representation of the present utility model.Fig. 4 is circuit theory diagrams of the present utility model.As shown in Figure 3, Figure 4, this utility model includes triggering circuit, trigger source optimizes circuit, two grades of avalanche transistors and pulse former.
Trigger circuit and connect the input of trigger source optimization circuit.Triggering circuit and be used for sending square wave as pumping signal, in the present embodiment, triggering circuit is a TTL signal source Vpeak, can produce pumping signal.
Trigger source optimizes circuit and includes RC peaker.Rising edge and the trailing edge differential respectively of pumping signal are processed as positive and negative pulse by RC peaker.In the present embodiment, RC peaker includes that the first electric capacity C1 and the first resistance R1, the first electric capacity C1 and the first resistance R1 connect, and these series circuit two ends are the input of RC peaker, and the first resistance R1 two ends are the outfan of RC peaker.
Trigger source optimizes circuit and also includes avalanche transistor Q1, the second electric capacity C2, the second resistance R2 and the 3rd resistance R3.Avalanche transistor Q1 is NPN type, and its base stage connects the outfan of RC peaker, grounded emitter, and colelctor electrode connects DC source Vdc by the second resistance R2；Second electric capacity C2 and the 3rd resistance R3 series connection, in this series circuit, one end of the second electric capacity C2 is connected to the second resistance R2 and the common port of avalanche transistor Q1, one end ground connection of the 3rd resistance R3；The common port of the second electric capacity C2 and the 3rd resistance R3 is the outfan that trigger source optimizes circuit.
Trigger source optimizes the emitter stage of outfan two grades of avalanche transistor Q2 of connection of circuit.DC source Vdc connects the colelctor electrode of two grades of avalanche transistor Q2, the base earth of two grades of avalanche transistor Q2 by the 4th resistance R4.The input of pulse former is connected to the colelctor electrode of two grades of avalanche transistor Q2, and outfan connects load, and pulse former is an energy-storage travelling wave tube, in order to coordinate two grades of avalanche transistor Q2 work.In the present embodiment, pulse former is the 3rd electric capacity C3.
As the preferred technical scheme of one, pulse shaper can be increased in foregoing circuit, pulse shaper is connected between the colelctor electrode of DC source Vdc and two grades of avalanche transistor Q2, for shortening the recovery time of two grades of avalanche transistor Q2, to reduce pulse ringing.In the present embodiment, pulse shaper is inductance L.
When the pumping signal that signal source Vpeak sends arrives, through RC peaker and avalanche transistor Q1,3rd resistance R3 is formed negative polarity burst pulse, owing to the pulse that triggers of two grades of avalanche transistor Q2 must be positive polarity, so by base stage and the emitter stage reversal connection of two grades of avalanche transistors in circuit, so, when negative polarity burst pulse arrives, two grades of avalanche transistor Q2 just can be made to enter avalanche condition, and the 3rd electric capacity C3 discharges rapidly, i.e. can form ultra-narrow pulse on load resistance RL.
Through test of many times, the invention also discloses the preferred scheme that pulses generation effect is best, the transistor that i.e. avalanche transistor and two grades of avalanche transistors all use model to be BFP450, Fig. 5 be model be BFP450 avalanche transistor schematic symbol diagram in ADS (AdvancedDesignSystem, Advanced Design System software).As it is shown in figure 5, colelctor electrode 1, base stage 2 and emitter stage 3, emitter stage 4 equal method as described above access circuit, when colelctor electrode 1 is 4.5～15V, it works in avalanche region.Using the transistor of this model, through actual measurement, the amplitude that can produce is about 10V, mid frequency is about the UWB ultra-narrow pulse that 2GHz, 10dB bandwidth is about 3.6GHz.
For the avalanche transistor coordinating model to be BFP450, the most preferably value of remaining circuit parameter is: the resistance of the first electric capacity C1 is 10pF, the resistance of the second electric capacity C2 and the 3rd electric capacity C3 is 3.9pF, the resistance of the first resistance R1 is 100 Ω, the resistance of the second resistance R2 and the 4th resistance R4 is 680 Ω, the resistance of the 3rd resistance R3 and the 5th resistance R5 is 50 Ω, and the resistance of inductance L is 10uH.
Fig. 6 is the simulation result comparison diagram of this utility model and UWB pulse-generating circuit output waveform of the prior art.Using ADS emulation, the equal selecting frequency of pumping signal is 1GHz, and amplitude is the square wave of 5V.Respectively tradition UWB pulse-generating circuit and circuit described in the utility model are emulated.As shown in Figure 6, the output signal of this utility model circuit is Vout1, and the output signal of tradition UWB pulse-generating circuit is Vout.This utility model circuit is each about-8V with tradition UWB pulse-generating circuit output pulse amplitude, but this utility model circuit output pulse more traditional UWB pulse-generating circuit exports pulse, and waveform symmetry, ring are obviously reduced.
This utility model also can increase transmitting-receiving test circuit.Fig. 7 is the structured flowchart of transmitting-receiving test circuit of the present utility model.Composition test circuit as shown in Figure 7, first makes this utility model UWB ultra-narrow pulse generator model machine, and PCB a size of 2.5cm × 2.5cm, power supply live width 20mil, signal live width 20mil, all components and parts all use surface mount packages, and choose FR-4 sheet material.Use the TTL pumping signal that model provides frequency to be 20MHz for Tektronix random waveform maker；The model of DC source is GWInstek, it is provided that 12V DC source；Oscillographic model is AgilentDS081204A, can be observed output pulse, its real-time bandwidth 12GHz by oscillograph, and maximum sample rate is 40GSa/s.Being that Model310CUWB electromagnetic horn is transmitted by model between load end and the oscillograph of ultra broadband ultra-narrow pulse generator, its input and outfan all use sub-miniature A connector.
Fig. 8-a is transmitting signal schematic representation of the present utility model.Fig. 8-b is that oscillograph of the present utility model receives signal schematic representation.As shown in Fig. 8-a, Fig. 8-b, actual measurement UWB ultra-narrow pulse transmitting-receiving effect at 5m, pulse amplitude is decayed to-2.381V by the-10.7V launched.
Above-described is only preferred implementation of the present utility model, and this utility model is not limited to above example.It is appreciated that the oher improvements and changes that those skilled in the art directly derive or associate on the premise of without departing from spirit of the present utility model and design, within being all considered as being included in protection domain of the present utility model.
Claims (7)
1. the ultra broadband ultra-narrow pulse generator for radar-probing system, it is characterised in that: include triggering circuit, trigger source optimizes circuit, two grades of avalanche transistors and pulse former；
The outfan triggering circuit connects the input of trigger source optimization circuit；Trigger source optimizes circuit and includes RC peaker, avalanche transistor, the second electric capacity, the second resistance and the 3rd resistance；The input of RC peaker is the input that trigger source optimizes circuit；Avalanche transistor is NPN type, and its base stage connects the outfan of RC peaker, grounded emitter, and colelctor electrode connects DC source by the second resistance；Second electric capacity and the 3rd resistant series, in this series circuit, one end of the second electric capacity is connected to the colelctor electrode of avalanche transistor, one end ground connection of the 3rd resistance；The common port of the second electric capacity and the 3rd resistance is the outfan that trigger source optimizes circuit；Two grades of avalanche transistors are NPN type；Trigger source optimizes the emitter stage of outfan two grades of avalanche transistors of connection of circuit；DC source connects the colelctor electrode of two grades of avalanche transistors, the base earth of two grades of avalanche transistors；The input of pulse former connects the colelctor electrode of two grades of avalanche transistors, and outfan connects load.
2. the ultra broadband ultra-narrow pulse generator for radar-probing system as claimed in claim 1, it is characterised in that: also include that pulse shaper, described pulse shaper are connected between the colelctor electrode of DC source and two grades of avalanche transistors.
3. the ultra broadband ultra-narrow pulse generator for radar-probing system as claimed in claim 2, it is characterised in that: described pulse shaper is inductance, and two ends connect DC source and the colelctor electrode of two grades of avalanche transistors respectively.
4. the ultra broadband ultra-narrow pulse generator for radar-probing system as claimed in claim 1, it is characterised in that: described RC peaker includes the first electric capacity and the first resistance；First electric capacity and the first resistant series, these series circuit two ends are the input of RC peaker；First resistance two ends are RC peaker outfan.
5. the ultra broadband ultra-narrow pulse generator for radar-probing system as claimed in claim 1, it is characterised in that: described pulse former is the 3rd electric capacity, and two ends connect colelctor electrode and the load of two grades of avalanche transistors respectively.
6. the ultra broadband ultra-narrow pulse generator for radar-probing system as claimed in claim 1, it is characterised in that: the model of avalanche transistor and two grades of avalanche transistors is BFP450, and when current collection extremely 4.5～15V, it works in avalanche region.
7. the ultra broadband ultra-narrow pulse generator for radar-probing system as claimed in claim 1, it is characterised in that: described triggering circuit be model be the random waveform maker of Tektronix, to provide the frequency TTL pumping signal as 20MHz；The model of described DC source is GWInstek, to provide 12V DC source；Also include the oscillograph that model is AgilentDS081204A, to observe output pulse；Being that Model310CUWB electromagnetic horn is transmitted by model between load end and the oscillograph of ultra broadband ultra-narrow pulse generator, its input and outfan all use sub-miniature A connector.
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| CN201620273963.3U CN205453650U (en) | 2016-04-05 | 2016-04-05 | A extremely narrow impulse generator of ultra wide band for radar detection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405508A (en) * | 2016-09-26 | 2017-02-15 | 中国电子科技集团公司第二十九研究所 | Ultra-narrow pulse generation device combined feeding device and method |
| CN106849916A (en) * | 2017-03-03 | 2017-06-13 | 南京邮电大学 | A kind of ultra-wideband pulse produces circuit |
| CN110907718A (en) * | 2019-10-29 | 2020-03-24 | 威凯检测技术有限公司 | Electromagnetic compatibility radiation disturbance standard sample for lighting product |
-
2016
- 2016-04-05 CN CN201620273963.3U patent/CN205453650U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405508A (en) * | 2016-09-26 | 2017-02-15 | 中国电子科技集团公司第二十九研究所 | Ultra-narrow pulse generation device combined feeding device and method |
| CN106405508B (en) * | 2016-09-26 | 2019-01-01 | 中国电子科技集团公司第二十九研究所 | A kind of compound feeder equipment of Ultra-short pulse generation device and method |
| CN106849916A (en) * | 2017-03-03 | 2017-06-13 | 南京邮电大学 | A kind of ultra-wideband pulse produces circuit |
| CN110907718A (en) * | 2019-10-29 | 2020-03-24 | 威凯检测技术有限公司 | Electromagnetic compatibility radiation disturbance standard sample for lighting product |
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Granted publication date: 20160810 Termination date: 20170405 |