CN108459304A - A kind of ultra-wideband pulse generation circuit can be used for Ground Penetrating Radar detection - Google Patents
A kind of ultra-wideband pulse generation circuit can be used for Ground Penetrating Radar detection Download PDFInfo
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- 238000009659 non-destructive testing Methods 0.000 abstract description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
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Abstract
The invention discloses a kind of ultra-wideband pulse generation circuits can be used for Ground Penetrating Radar detection, including front end input, differential amplifier circuit, shaping network, power amplification circuit, rear end output, electric power bias circuit.The front end input connection differential amplifier circuit generates the larger square-wave signal of an amplitude, signal generates the narrow pulse signal of a nanosecond by shaping network, power amplification circuit improves its amplitude and power amplification the energy of pulse signal, and a ultra-wideband impulse signal is generated finally by output rear end.It is 10 megahertzs of 1 nanosecond period that can reach 10 volts of pulse widths according to said program impulse amplitude, and there is higher pulse energy to be very suitable for applying the signal emission part in non-destructive testing.
Description
Technical field
The present invention relates to a kind of detections applied to especially for bridge road structure context of detection in terms of Ground Penetrating Radar
Circuit belongs to field of non destructive testing.
Background technology
Ultra wide band (UWB) is used as a kind of novel wireless communication technology, by with very steep rising edge and failing edge
Pulse is modulated, and reaches the bandwidth of 1GHz or so, its transmission frequency is very wide while high-speed communication and required transmitting
Power is relatively low.The signal frequency the high under normal circumstances is lost bigger, the pulse frequency in geologic radar detection application in the medium
High detection resolution is higher, but on the one hand the depth that can be detected needs to the greatest extent with regard to smaller so wanting the detection of progress geology deep layer
Amount improves impulse amplitude, is on the other hand also required to reduce pulse width as far as possible.Federal Communications Commission (FCC) in 2002
Propose two kinds of definition of ultra-wideband pulse：
(1) relative bandwidth (- 10dB bandwidth) of signal is more than 20%；
(2) no matter signal is much, and signal center frequency is more than or equal to 500Mhz.
Compared with common means of communication, ultra-wideband communications possess broader frequency band.UWB is risen and fallen using pulse in the time domain
The communications that the time domain impulse of point is directly realized by modulating UWB are directly placed on modulation intelligence on one very wide frequency band
It carries out, this process duration determines the frequency range that ultra wide band uses.The hardware that ultra-wideband impulse signal generates is real
Existing mode can be divided into two classes：One kind is to use Design of Digital Circuit, and burst pulse is generated using the delay inequality of gate circuit, this
Signal amplitude that is more complicated using the method for digital circuit generation pulse signal and generating is not high, and it is automatic can be often used in low frequency
Inside control system；Another kind of is analog circuit implementation method, is realized using the switching characteristic of photoconductive switch and semiconductor devices
Burst pulse generator, such as the high-speed switch characteristic using avalanche transistor and avalanche diode in avalanche breakdown generate pulse and believe
Number, either restore the higher switching rate of triode using step-recovery diode or step, shorter switch time is realized
Powerful pulse signal may be implemented in pulse generator, this kind of circuit.
Existing Chinese patent CN201710122968.5 discloses a kind of ultra-wideband pulse generation circuit, including differential
Circuit, negative feedback network, direct current biasing module, switching circuit, amplifying circuit, shaping network.The differential circuit and external number
Word signal is connected；Amplifying circuit is connected with switching circuit amplifies the amplitude of pulse signal；Finally use the two of shaping network
The pulse signal of amplification is shaped to the ultra-wideband impulse signal of a nanosecond by nthdifferential circuit.The switching circuit is to utilize
The switching characteristic of triode generates the square-wave signal of a switch control；The amplifying circuit is the higher square wave of amplitude that will be generated
Being amplified by triode and energy storage inductor for signal, keeps the amplitude of output waveform bigger；The shaping network is by amplitude
Larger pulse signal is shaped to the ultra-wideband impulse signal of a nanosecond by two stages of differentiation circuit.It is produced according to said program
A raw ultra-wideband impulse signal for being free of DC component, is well suited for antenna transmitting, reduces the complexity of entire circuit.
Invention content
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention to provide a kind of available based on transistor
In the ultra-wideband pulse radiating circuit of Ground Penetrating Radar detection, it is 1 nanosecond of 10Mhz pulse widths amplitude that frequency can be generated by, which realizing,
The function of the Gaussian pulse of 10V can be applied in road and bridge structure detection, geology detecting, in underwater detection.
Technical solution：To achieve the above object, the technical solution adopted by the present invention is：
A kind of ultra-wideband pulse generation circuit can be used for Ground Penetrating Radar detection, including sequentially connected front end input electricity
Road, differential amplifier circuit, shaping network circuit, power amplification circuit and rear end output circuit, and the shaping network circuit,
Power amplification circuit and rear end output circuit are connect with electric power bias circuit respectively, and the electric power bias circuit is shaping network
Circuit, power amplification circuit and rear end output circuit provide voltage bias；The square-wave signal enter circuit first to its into
The differential amplification of row, the amplitude of amplified signal provide a stable amplification square wave to late-class circuit, and the signal of amplification passes through shaping
Lattice network, shaping network carry out differential, amplification, again differential, reversed amplification to the rising edge signal of square wave, finally generate one
The higher nanosecond positive pulse signal of amplitude, the signal carry out power amplification by power amplification circuit, to ensure that circuit produces
The high-frequency ultra-wideband pulse signal of raw large energy.
Preferably：The front end input circuit is that level-one differential circuit is connected with external crystal-controlled oscillation, and periodic signal of square wave is logical
It crosses level-one differential circuit and removes DC component, the low and high level of square-wave signal is used for controlling triode ON closing.
Preferably：The front end input circuit includes sequentially connected crystal oscillator X1, the first capacitance C1, first resistor R1, and
The cathode ground connection of crystal oscillator X1, first resistor R1.
Preferably：The differential amplifier circuit amplifies the square-wave signal for removing DC component into line amplitude, reduces zero
Drift about and generate the square-wave signal of a stabilization with higher amplitude.
Preferably：The differential amplifier circuit includes the first NPN triode Q1, the second NPN triode Q2, first resistor
R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second capacitance
C2, third capacitance C3, wherein：
The base stage connection first resistor R1 of first NPN triode Q1 to, and the collector of the first NPN triode Q1
It is connect with second resistance R2；The base stage of the second NPN triode Q2 connects the 7th resistance R7 to ground, the second NPN triode Q2
Collector connect with 3rd resistor R3, and the emitter phase of the emitter of the second NPN triode Q2 and the first NPN triode Q1
Connect and the 6th resistance R6 and the 5th resistance R5 that connects is to negative power supply, third capacitance C3 ground connection is connected with resistance R5, R6；Described
Four resistance R4 are connect with the second capacitance C2 second resistance R2 3rd resistors R3, wherein the 4th resistance R4 connects cathode power supply, the second electricity
Hold C2 ground connection.
Preferably：The shaping network circuit includes that sequentially connected second-order differential circuit, total radio amplifier, three-level are micro-
Parallel circuit, reverse amplification circuit, wherein：
The second-order differential circuit is used to receive the rising edge of input square-wave signal, and it is straight to remove it by second-order differential circuit
Flow component simultaneously generates the lower nanosecond high-frequency pulse signal of an amplitude；
The total radio amplifier, which is used to amplify the nanosecond high-frequency pulse signal into line amplitude, generates a high frequency negative
Pulse signal；
The three-level differential circuit connect with total radio amplifier and is output to reverse amplification circuit, above-mentioned negative for removing
The DC component of pulse signal simultaneously continues to obtain the smaller narrower negative pulse letter of amplitude to the failing edge differential of undersuing
Number；
The reverse amplification circuit is used to amplify to generate the larger forward direction height of amplitude into line amplitude to undersuing
Frequency pulse signal.
Preferably：The shaping network circuit includes the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, the 7th capacitance
C7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor
R13, third NPN triode Q3, the 4th PNP triode Q4, wherein：
Between the collector and the base stage of third NPN triode Q3 of 4th capacitance C4 the second NPN triodes of connection Q2,
And pass through the 8th resistance R8 ground connection；The emitter of the third NPN triode Q3 is grounded；The collector of third NPN triode Q3
With the connection of the 9th resistance R9, the 9th resistance R9 and the tenth resistance R10 is connected to cathode power supply, and the 5th capacitance C5 connects
Ground is connect with the tenth resistance R10；The collector and the 4th PNP triode of the 6th capacitance C6 connection third NPN triodes Q3
Between Q4, eleventh resistor R11 plus earths are connect with the 4th PNP triode Q4 base stages；
The emitter of the 4th PNP triode Q4 is grounded, and the collector of the 4th PNP triode Q4 and the 12nd electricity
R12 connections are hindered, twelfth resistor R12 and thirteenth resistor R13 is connected to negative power supply, the 7th capacitance C7 ground connection and the 13rd electricity
Hinder R13 connections.
Preferably：The power amplification circuit includes sequentially connected level Four differential circuit and pliotron, and described four
Nthdifferential circuit is used to remove the DC component of above-mentioned positive high-frequency pulse signal and to the further differential of pulse signal rising edge
The positive pulse signal of an amplitude-controllable is obtained, the pliotron is used to generate one into line amplitude amplification to positive pulse signal
A negative gauss pulse signal and improve output power driving rear end output circuit.
Preferably：The power amplification circuit includes the 8th capacitance C8, the 9th capacitance C9, the 14th resistance R14, the 15th
Resistance R15, the 16th resistance R16, inductance L1, pliotron Q5, wherein：
Between the 4th PNP triode Q4 collectors of connection and pliotron Q5 base stages of the 8th capacitance C8, and even
The 14th resistance R14 is met to ground terminal, the emitter of pliotron Q5 is grounded, the collector of pliotron Q5 and the 15th electricity
Resistance R15, inductance L1, the 16th resistance R16 are sequentially connected to cathode power supply, and the 9th capacitance C9 ground connection connects with the 16th resistance R16
It connects.
Preferably：The rear end output circuit includes the tenth capacitance C10 and the 17th resistance R17, the tenth capacitance C1
It connects between pliotron Q5 collectors and antenna, the tenth capacitance C10 and the 17th resistance R17 is connected to the ground.
The present invention compared with prior art, has the advantages that：
The present invention provides a kind of ultra-wideband pulse generation circuits can be used for detections of radar, are realized with discrete component
The small function of the low-power consumption of circuit, low cost, amplitude, low frequency energy.Input circuit, which has accessed differential amplifier circuit, to be had
The influence that the compensation amplifying circuit drift voltage of effect is brought, pulse shaper to a certain extent may be used by two stages of differentiation circuit
To realize that the random control of pulse-width, last power amplification circuit ensure that signal has stronger driving capability.
Description of the drawings
Fig. 1 is the entire block diagram of the present invention；
Fig. 2 is the circuit diagram of the present invention；
Fig. 3 is the output waveform using the ADS software emulation present invention.
Specific implementation mode
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these examples are merely to illustrate this
It invents rather than limits the scope of the invention, after having read the present invention, those skilled in the art are various to the present invention's
The modification of equivalent form falls within the application range as defined in the appended claims.
A kind of ultra-wideband pulse generation circuit can be used for Ground Penetrating Radar detection, as shown in Figure 1, before including sequentially connected
Hold input circuit, differential amplifier circuit, shaping network circuit, power amplification circuit and rear end output circuit, and the shaping
Lattice network, power amplification circuit and rear end output circuit are connect with electric power bias circuit respectively, the electric power bias circuit
Voltage bias is provided for shaping network circuit, power amplification circuit and rear end output circuit；The square-wave signal enters circuit
Differential amplification is carried out to it first, the amplitude of amplified signal provides a stable amplification square wave, the letter of amplification to late-class circuit
Number pass through shaping network circuit, shaping network carries out differential, amplification, again differential, direction amplification to the rising edge signal of square wave, most
The higher nanosecond positive pulse signal of an amplitude is generated afterwards, which carries out power amplification by power amplification circuit, to
Ensure that circuit generates the high-frequency ultra-wideband pulse signal of large energy.Entire design mainly by the square-wave signal to input into
Row amplification differential, generates a sharp pulse signal and is constantly amplified differential to realize ultra-wideband pulse.According to top
Case generates the nanosecond ultra-wideband impulse signal of a higher amplitude, can be used for radar antenna transmitting.
The front end input is for ensureing one square-wave signal for removing DC component of circuit output, the front end input electricity
Road is that level-one differential circuit is connected with external crystal-controlled oscillation, and periodic signal of square wave removes DC component by level-one differential circuit, side
The low and high level of wave signal is used for controlling triode ON closing.Front end input circuit includes sequentially connected crystal oscillator X1, first
Capacitance C1, first resistor R1, and the cathode ground connection of crystal oscillator X1, first resistor R1.
Front end input is made of crystal oscillator X1, the first capacitance C1 connections, and crystal oscillator X1 generates the square-wave signal of a 10Mhz, warp
It crosses the first capacitance C1 and removes DC component and be transferred to differential amplifier circuit.Namely by 10Mhz crystal oscillators the first capacitance C1 of series connection, use
In removing the DC component in square wave.First capacitance C1 and first resistor R1 form a differential circuit, and regulation resistance size can
With the amplitude size of control output square wave.
The differential amplifier circuit forms the square-wave signal of a high voltage amplitude for amplifying as far as possible to square wave；Institute
It states differential amplifier circuit to be connected with front end input circuit and be output to shaping network circuit, the square wave to removing DC component is believed
Number into line amplitude amplify, reduce null offset and generate one with higher amplitude stabilization square-wave signal.It is described differential
Amplifying circuit include the first NPN triode Q1, the second NPN triode Q2, first resistor R1, second resistance R2,3rd resistor R3,
4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second capacitance C2, third capacitance C3, wherein：
The base stage connection first resistor R1 of first NPN triode Q1 to, and the collector of the first NPN triode Q1
It is connect with second resistance R2；The base stage of the second NPN triode Q2 connects the 7th resistance R7 to ground, the second NPN triode Q2
Collector connect with 3rd resistor R3, and the emitter phase of the emitter of the second NPN triode Q2 and the first NPN triode Q1
Connect and the 6th resistance R6 and the 5th resistance R5 that connects is to negative power supply, third capacitance C3 ground connection is connected with resistance R5, R6；Described
Four resistance R4 are connect with the second capacitance C2 second resistance R2 3rd resistors R3, wherein the 4th resistance R4 connects cathode power supply, the second electricity
Hold C2 ground connection.
It is grounded the second capacitance C2 and connects the 4th resistance R4 to positive voltage source offer biasing positive voltage, ground connection third capacitance C3 goes here and there
Join the 5th resistance R5 to negative voltage source offer negative bias voltage, the 6th one end resistance R6 and the first NPN triode Q1, the 2nd NPN
The triode Q2 emitters connection other end is connected to negative bias circuit control triode quiescent bias current, and signal is from the first NPN
The input of triode Q1 base stages generates the significantly square-wave signal of a positive amplification from the output of the second NPN triode Q2 collectors.
The shaping network is made of two stages of differentiation circuit and two-stage total radio amplifier, and wherein prime differential circuit is used for
Rising edge to square-wave signal and failing edge differential, prime total radio amplifier are constituted using NPN triode, are risen for extracting
The tip pulse on edge simultaneously amplifies the generation higher reversed narrow pulse signal of one amplitude, and rear class differential circuit extracts above-mentioned burst pulse
The failing edge and rising edge of signal generate a narrower pulse signal, pulse point of the rear class amplifying circuit to the signal negative direction
Continue the positive nanosecond pulse signal that amplification generates a 5V voltages in end.The differential amplifier circuit is single-ended using single ended input
The circuit structure of output amplifies square-wave signal into line amplitude, generates the cycle square wave of a 12V10Mhz.The differential amplification
Circuit provides forward voltage bias by the external direct voltage source of biasing circuit of the second capacitance C2, the 4th resistance R4 compositions, leads to
The external direct voltage source offer negative voltage bias of biasing circuit for crossing third capacitance C3, the 5th resistance R5 compositions, wherein the 6th electricity
It hinders R6 and determines that above-mentioned amplifying circuit bias current, 3rd resistor R3 control square-wave signal gain amplifier.Gain amplifier meets：
(wherein β is cascode amplification factor, the r of the second triode Q2beFor the equivalent AC resistance of the second triode Q2, RL
For the equivalent load resistance of amplifying circuit)
The shaping network circuit include sequentially connected second-order differential circuit, total radio amplifier, three-level differential circuit,
Reverse amplification circuit, wherein：
The second-order differential circuit is used to receive the rising edge of input square-wave signal, and it is straight to remove it by second-order differential circuit
Flow component simultaneously generates the lower nanosecond high-frequency pulse signal of an amplitude；
The total radio amplifier, which is used to amplify the nanosecond high-frequency pulse signal into line amplitude, generates a high frequency negative
Pulse signal；
The three-level differential circuit connect with total radio amplifier and is output to reverse amplification circuit, above-mentioned negative for removing
The DC component of pulse signal simultaneously continues to obtain the smaller narrower negative pulse letter of amplitude to the failing edge differential of undersuing
Number；
The reverse amplification circuit is made of PNP triode, for amplifying into line amplitude to generate to undersuing
The larger positive high-frequency pulse signal of amplitude.
The shaping network circuit includes the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, the 7th capacitance C7, the 8th
Resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, third
NPN triode Q3, the 4th PNP triode Q4, wherein：
Between the collector and the base stage of third NPN triode Q3 of 4th capacitance C4 the second NPN triodes of connection Q2,
And pass through the 8th resistance R8 ground connection；The emitter of the third NPN triode Q3 is grounded；The collector of third NPN triode Q3
With the connection of the 9th resistance R9, the 9th resistance R9 and the tenth resistance R10 is connected to cathode power supply, and the 5th capacitance C5 connects
Ground is connect with the tenth resistance R10；The collector and the 4th PNP triode of the 6th capacitance C6 connection third NPN triodes Q3
Between Q4, eleventh resistor R11 plus earths are connect with the 4th PNP triode Q4 base stages；
The emitter of the 4th PNP triode Q4 is grounded, and the collector of the 4th PNP triode Q4 and the 12nd electricity
R12 connections are hindered, twelfth resistor R12 and thirteenth resistor R13 is connected to negative power supply, the 7th capacitance C7 ground connection and the 13rd electricity
Hinder R13 connections.
The 8th resistance R8 ground connection composition second-order differential circuits of 4th capacitance C4 connections, one is generated to the rising edge differential of square wave
A upward pulse and downward pulse.Third NPN triode Q3 is connect using cascode enlarged structure with the 9th resistance R9, is taken just
Be amplified to the tip portion of pulse and generate one 12 or so undersuing, in the amplifying circuit the 5th capacitance C5 with
Tenth resistance R10 composition voltage offset electric circuits connect positive supply.6th capacitance C6 and eleventh resistor R11 is as reversed amplification electricity
On the one hand third level differential circuit before road removes the DC component of negative pulse, in addition further to the failing edge differential of negative pulse
Generate a narrow arteries and veins of the smaller nanosecond of amplitude.Thirteenth resistor R13, the 17th capacitance C7 connect negative supply as bigoted circuit
Negative voltage bias is provided, the 4th PNP triode Q4 connection twelfth resistor R12 bear tip to pulse and are amplified one width of generation
Larger positive narrow pulse signal is spent, the pulse signal width is mainly by above-mentioned the 8th resistance R8 of two stages of differentiation circuit, the 4th
RC constant, τs (τ=RC, R indicate that resistance value, C indicate capacitance) decision of capacitance C4 and eleventh resistor R11, the 6th capacitance C6.
Second-order differential circuit is made of the 8th the 4th capacitance C4 of resistance R8 series connection of ground connection for extracting for extracting on square wave
Rise along generate a burst pulse, the preamplifying circuit by connect the 9th resistance R9 connection third NPN triodes Q3 current collection
Pole is constituted for generating the larger reversed burst pulse of an amplitude, power supply series connection to the positive tip portion waveform amplification of burst pulse
Tenth resistance R10 provides forward voltage bias by the 5th capacitance C5 ground connection.
Three-level differential circuit is made of the 6th capacitance C6 of ground connection eleventh resistor R11 series connection for extracting for extracting negative arteries and veins
It rushes failing edge and generates a more burst pulse, the total radio amplifier is by the 4th PNP triode of series connection twelfth resistor R12 connections
The collector of Q4 is constituted, the forward direction for generating a larger nanosecond of amplitude to the negative tip portion waveform amplification of burst pulse
Burst pulse, power supply series connection thirteenth resistor R13 pass through the 7th capacitance C7 ground connection and provide reverse voltage bias.
The power amplification circuit is used to amplify above-mentioned pulse signal into line amplitude and improve the output power of circuit.Institute
It includes sequentially connected level Four differential circuit and pliotron to state power amplification circuit, and the level Four differential circuit is for removing
The DC component of above-mentioned forward direction high-frequency pulse signal simultaneously obtains amplitude-controllable to the further differential of pulse signal rising edge
Positive pulse signal, the pliotron, which is used to amplify positive pulse signal into line amplitude, generates a negative gauss pulse signal simultaneously
And it improves output power and drives rear end output circuit.
The power amplification circuit includes the 8th capacitance C8, the 9th capacitance C9, the 14th resistance R14, the 15th resistance
R15, the 16th resistance R16, inductance L1, pliotron Q5, wherein：
Between the 4th PNP triode Q4 collectors of connection and pliotron Q5 base stages of the 8th capacitance C8, and even
The 14th resistance R14 is met to ground terminal, the emitter of pliotron Q5 is grounded, the collector of pliotron Q5 and the 15th electricity
Resistance R15, inductance L1, the 16th resistance R16 are sequentially connected to cathode power supply, and the 9th capacitance C9 ground connection connects with the 16th resistance R16
It connects.
8th capacitance C8, the 4th resistance R4 composition fourth stage differential circuit remove the DC component of above-mentioned burst pulse to its after
Continuous differential generates a burst pulse, and the 16th resistance R16, the 9th capacitance C9, inductance L1 are as biasing circuit connection positive supply
5th pliotron Q5 provides voltage bias.The 15th resistance R15 of 5th pliotron Q5 tie points amplifies according to cascode
Structure connection carries out afterbody amplification to signal.
The 14th resistance R14 ground connection of level Four differential circuit connect composition differential circuit with the 8th capacitance C8 and removes pulse signal
DC component simultaneously continues to extract pulse tip portion, decouples the 16th resistance R16 of the 9th capacitance C9 connections, power supply connection the 16th
Resistance R16 and series inductance L1 are connected to the 15th resistance R15 of series connection and provide positive bias voltage, the 15th resistance R15 connections of connecting
5th NPN triode Q5 collectors form total radio amplifier, the 5th NPN triode Q5 emitters ground connection, tip pulse signal
Enter collector output from base stage to generate a ultra-wideband impulse signal.
The rear end output circuit is for going electric ultra-wideband impulse signal DC component and by adjusting the 17th resistance R17
Realization is matched with transmitting antenna, i.e., emits ultra-wideband impulse signal eventually by antenna.The rear end output circuit includes the tenth
Capacitance C10 and the 17th resistance R17, the tenth capacitance C1 connect between pliotron Q5 collectors and antenna, and the described tenth
Capacitance C10 is connected to the ground with the 17th resistance R17.Tenth capacitance C10 is used for isolated DC component, and the 17th resistance R17 is used for
Rear firing emission antenna match generates a ultra-wideband impulse signal by foregoing circuit and matches and can incite somebody to action with 250Mhz transmitting antennas
Most of pulse energy is launched well.
The bias power supply circuit is above-mentioned differential to put according to the external specific bias voltage of concrete application characteristic of triode
Big circuit forward bias connects the external -5V voltage sources of 12V power supplys, negative bias circuits, NPN triode biased electrical in above-mentioned shaping circuit
The external 12V voltage sources in road, the external -5V voltage sources of PNP triode biasing circuit, above-mentioned power amplification circuit biasing circuit are external
17.5V voltage feds.
Such as Fig. 3, simulating, verifying is carried out to said program by ADS and is obtained a result, it is final to realize one without DC component
Amplitude is that 10V pulse widths are the cyclical signal that 1ns frequencies are 10Mhz, can be used as ultra-wideband pulse, is had higher
Pulse energy be very suitable for applying the signal emission part in non-destructive testing.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of ultra-wideband pulse generation circuit can be used for Ground Penetrating Radar detection, it is characterised in that：Before sequentially connected
Hold input circuit, differential amplifier circuit, shaping network circuit, power amplification circuit and rear end output circuit, and the shaping
Lattice network, power amplification circuit and rear end output circuit are connect with electric power bias circuit respectively, the electric power bias circuit
Voltage bias is provided for shaping network circuit, power amplification circuit and rear end output circuit；The square-wave signal enters circuit
Differential amplification is carried out to it first, the amplitude of amplified signal provides a stable amplification square wave, the letter of amplification to late-class circuit
Number pass through shaping network circuit, shaping network to the rising edge of square-wave signal carry out differential, amplification, again differential, reversely amplify, most
The higher nanosecond positive pulse signal of an amplitude is generated afterwards, which carries out power amplification by power amplification circuit, to
Ensure that circuit generates the high-frequency ultra-wideband pulse signal of large energy.
2. can be used for the ultra-wideband pulse generation circuit of Ground Penetrating Radar detection according to claim 1, it is characterised in that：It is described
Front end input circuit is that level-one differential circuit is connected with external crystal-controlled oscillation, and periodic signal of square wave is removed directly by level-one differential circuit
Flow component, the low and high level of square-wave signal are used for controlling triode ON closing.
3. can be used for the ultra-wideband pulse generation circuit of Ground Penetrating Radar detection according to claim 1, it is characterised in that：It is described
Front end input circuit includes sequentially connected crystal oscillator X1, the first capacitance C1, first resistor R1, and crystal oscillator X1, first resistor R1 connect
Ground.
4. can be used for the ultra-wideband pulse generation circuit of Ground Penetrating Radar detection according to claim 1, it is characterised in that：It is described
Differential amplifier circuit amplifies to removing the square-wave signal of DC component into line amplitude, reduce null offset and generate one have compared with
The square-wave signal of the stabilization of high-amplitude.
5. can be used for the ultra-wideband pulse generation circuit of Ground Penetrating Radar detection according to claim 1, it is characterised in that：It is described
Differential amplifier circuit includes the first NPN triode Q1, the second NPN triode Q2, first resistor R1, second resistance R2, third electricity
R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the second capacitance C2, third capacitance C3 are hindered, wherein：
The base stage connection first resistor R1 of first NPN triode Q1 to, and the collector of the first NPN triode Q1 and the
Two resistance R2 connections；The base stage of the second NPN triode Q2 connects the 7th resistance R7 to ground, the collection of the second NPN triode Q2
Electrode is connect with 3rd resistor R3, and the emitter of the second NPN triode Q2 is connected simultaneously with the emitter of the first NPN triode Q1
The 5th resistance R5 of the 6th resistance R6 connect to negative power supply, third capacitance C3 ground connection is connected with resistance R5, R6；4th resistance
R4 is connect with the second capacitance C2 second resistance R2 3rd resistors R3, wherein the 4th resistance R4 connects cathode power supply, the second capacitance C2 connects
Ground.
6. can be used for the ultra-wideband pulse generation circuit of Ground Penetrating Radar detection according to claim 1, it is characterised in that：It is described
Shaping network circuit includes sequentially connected second-order differential circuit, total radio amplifier, three-level differential circuit, reversed amplification electricity
Road, wherein：
The second-order differential circuit is used to receive the rising edge of input square-wave signal, removes its direct current point by second-order differential circuit
It measures and generates the lower nanosecond high-frequency pulse signal of an amplitude；
The total radio amplifier, which is used to amplify the nanosecond high-frequency pulse signal into line amplitude, generates a high frequency negative pulse
Signal；
The three-level differential circuit connect with total radio amplifier and is output to reverse amplification circuit, for removing above-mentioned negative pulse
The DC component of signal simultaneously continues to obtain the smaller narrower undersuing of amplitude to the failing edge differential of undersuing；Institute
Reverse amplification circuit is stated for amplifying into line amplitude to generate the larger positive high-frequency pulse signal of amplitude to undersuing.
7. can be used for the ultra-wideband pulse generation circuit of Ground Penetrating Radar detection according to claim 1, it is characterised in that：It is described
Shaping network circuit includes the 4th capacitance C4, the 5th capacitance C5, the 6th capacitance C6, the 7th capacitance C7, the 8th resistance R8, the 9th electricity
Hinder R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, third NPN triode Q3, the
Four PNP triode Q4, wherein：
Between the collector and the base stage of third NPN triode Q3 of 4th capacitance C4 the second NPN triodes of connection Q2, and lead to
Cross the 8th resistance R8 ground connection；The emitter of the third NPN triode Q3 is grounded；The collector of third NPN triode Q3 and
The connection of nine resistance R9, the 9th resistance R9 and the tenth resistance R10 are connected to cathode power supply, the 5th capacitance C5 ground connection with
Tenth resistance R10 connections；The collector and the 4th PNP triode Q4 of the 6th capacitance C6 connection third NPN triodes Q3 it
Between, eleventh resistor R11 plus earths are connect with the 4th PNP triode Q4 base stages；
The emitter of the 4th PNP triode Q4 is grounded, and the collector and twelfth resistor of the 4th PNP triode Q4
R12 connections, twelfth resistor R12 and thirteenth resistor R13 are connected to negative power supply, the 7th capacitance C7 ground connection and thirteenth resistor
R13 connections.
8. can be used for the ultra-wideband pulse generation circuit of Ground Penetrating Radar detection according to claim 1, it is characterised in that：It is described
Power amplification circuit includes sequentially connected level Four differential circuit and pliotron, and the level Four differential circuit is for removing
It states the DC component of positive high-frequency pulse signal and an amplitude-controllable is being obtained just to the further differential of pulse signal rising edge
Pulse signal, the pliotron be used for positive pulse signal into line amplitude amplify generate a negative gauss pulse signal and
It improves output power and drives rear end output circuit.
9. can be used for the ultra-wideband pulse generation circuit of Ground Penetrating Radar detection according to claim 1, it is characterised in that：It is described
Power amplification circuit includes the 8th capacitance C8, the 9th capacitance C9, the 14th resistance R14, the 15th resistance R15, the 16th resistance
R16, inductance L1, pliotron Q5, wherein：
Between the 4th PNP triode Q4 collectors of connection and pliotron Q5 base stages of the 8th capacitance C8, and connect the
14 resistance R14 are to ground terminal, and the emitter of pliotron Q5 is grounded, the collector of pliotron Q5 and the 15th resistance
R15, inductance L1, the 16th resistance R16 are sequentially connected to cathode power supply, and the 9th capacitance C9 ground connection connect with the 16th resistance R16.
10. can be used for the ultra-wideband pulse generation circuit of Ground Penetrating Radar detection according to claim 1, it is characterised in that：Institute
It includes the tenth capacitance C10 and the 17th resistance R17 to state rear end output circuit, and the tenth capacitance C1 connects pliotron Q5 current collections
Between pole and antenna, the tenth capacitance C10 and the 17th resistance R17 is connected to the ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810565704.1A CN108459304A (en) | 2018-06-04 | 2018-06-04 | A kind of ultra-wideband pulse generation circuit can be used for Ground Penetrating Radar detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810565704.1A CN108459304A (en) | 2018-06-04 | 2018-06-04 | A kind of ultra-wideband pulse generation circuit can be used for Ground Penetrating Radar detection |
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ID=63214869
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| CN201810565704.1A Pending CN108459304A (en) | 2018-06-04 | 2018-06-04 | A kind of ultra-wideband pulse generation circuit can be used for Ground Penetrating Radar detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113098452A (en) * | 2021-03-30 | 2021-07-09 | 中北大学 | Ultra-narrow pulse compression device based on triode and step recovery diode |
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