CN206629040U - A kind of ultra-wideband pulse generation circuit - Google Patents
A kind of ultra-wideband pulse generation circuit Download PDFInfo
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- CN206629040U CN206629040U CN201720201349.0U CN201720201349U CN206629040U CN 206629040 U CN206629040 U CN 206629040U CN 201720201349 U CN201720201349 U CN 201720201349U CN 206629040 U CN206629040 U CN 206629040U
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Abstract
The utility model is directed primarily to a kind of ultra-wideband pulse generation circuit, including differential circuit, negative feedback network, direct current biasing module, on-off circuit, amplifying circuit, shaping network.The differential circuit is connected with external digital signal；Amplifying circuit is connected with on-off circuit by the amplitude amplification of pulse signal；Finally the pulse signal of amplification is shaped to the ultra-wideband impulse signal of a nanosecond with the two stages of differentiation circuit of shaping network by we.The on-off circuit is the square-wave signal that a switch control is produced using the switching characteristic of triode；The amplifying circuit is to be amplified the higher square-wave signal of caused amplitude by triode and energy storage inductor, makes the amplitude of output waveform bigger；The larger pulse signal of amplitude is shaped to the ultra-wideband impulse signal of a nanosecond by the shaping network by two stages of differentiation circuit.One ultra-wideband impulse signal for being free of DC component is produced according to such scheme, is well suited for antenna transmitting, reduces the complexity of whole circuit.
Description
Technical field
The communications field is the utility model is related to, it is especially very extensive in the application of GPR, communication aspects.
Technical background
UWB (Ultra-wide Bandwidth) is a kind of no-load communication techniques, utilizes nanosecond (ns) to psec (ps)
The non-sinusoidal waveform burst pulse transmission data of level, and time modulation tech makes its transfer rate to greatly improve, and power consumption
It is relatively low, and have more accurate stationkeeping ability.Different from the continuous carrier mode that common communication uses, UWB is using extremely short
Pulse signal transmit data.Bandwidth shared by these pulses is even up to several GHz, therefore maximum data transfer rate can
To reach hundreds of Mb/ps.Because using extremely short pulse, while high-speed communication, the transmission power of UWB equipment is but very
It is small, only more than one the percent of only current continuous carrier system.
According to FCC (FCC) definition, ultra-broadband signal refers to that absolute bandwidth is more than at -10dB
500MHz or relative bandwidth are more than 20% and centre frequency is more than 500MHz signal.Ultra-broadband signal is lasting in time domain representation
Time extremely short pulse, generally only hundreds of psecs or hundreds of nanoseconds.Ultra-wideband pulse is often by half with speed-sensitive switch characteristic
Conductor device and transmission line produce.The device for being usually used in producing ultra-wideband pulse has tunnel diode, step-recovery diode, snow
Triode and photoconductive switch etc. are collapsed, wherein, pulse rise time caused by tunnel diode and step-recovery diode is reachable
Tens to hundreds of psecs, but its amplitude very little, only tens to hundreds of millivolts.Photoconductive switch based on gap can produce kilovolt
Pulse above, but caused pulse recurrence frequency is too low, and also the supply voltage for needing hundreds to thousands to lie prostrate during work, volume
It is huge, it is unfavorable for the design requirement of miniaturization.The ultra-narrow pulse signal of picosecond magnitude can be also produced using nonlinear transmission line, but
It is very high to technological requirement, it is costly, limit its use range.Avalanche transistor can produce the pulse of nanosecond, can trigger
Frequency is high, and for amplitude up to tens volts, circuit realiration is simple, can meet the technical requirements of general receive-transmit system, more practical, therefore
It is often used in the design of ultra-wideband pulse generator.But the existing pulse-generating circuit requirement based on avalanche transistor
Supply voltage is higher, is unfavorable for miniaturization and the Mobile portable of equipment, also, pulses generation of the in general based on avalanche transistor
Circuit can only directly produce Gaussian pulse, and Gaussian pulse contains DC component and more low frequency component, be not suitable for antenna transmitting,
So also need to add extra pulse shaper carries out differential and filtering by caused Gaussian pulse, to obtain being adapted to antenna
The high-order Gaussian pulse or other waveforms of transmitting, and traditional pulse-generating circuit power is smaller, caused impulse amplitude compared with
It is low, generally require to add extra broad band amplifier, these add the complexity and cost of circuit.
Described in summary, existing ultra-wideband pulse technical sophistication, impulse amplitude is low, and impulse waveform is not suitable for the hair of antenna
Penetrate.
Utility model content
The utility model relates generally to a ultra-wideband impulse signal for being suitable for antenna transmitting, and whole design includes：It is micro-
Parallel circuit, negative feedback network, direct current biasing module, on-off circuit, amplifying circuit, shaping network.The differential circuit and outside
Data signal is connected；Amplifying circuit is connected with on-off circuit by the amplitude amplification of pulse signal；Finally we are with shaping net
The pulse signal of amplification is shaped to the ultra-wideband impulse signal of a nanosecond by the two stages of differentiation circuit of network.The on-off circuit
It is the square-wave signal that a switch control is produced using the switching characteristic of triode；The amplifying circuit be by caused amplitude compared with
Being amplified by triode and energy storage inductor for high square-wave signal, makes the amplitude of output waveform bigger；The shaping network
The larger pulse signal of amplitude is shaped to the ultra-wideband impulse signal of a nanosecond by two stages of differentiation circuit.According to above-mentioned
Scheme produces a ultra-wideband impulse signal for being free of DC component, is well suited for antenna transmitting, reduces the complexity of whole circuit
Property.
Concrete technical scheme is as follows：
A kind of ultra-wideband pulse generation circuit, including differential circuit, on-off circuit, direct current biasing module, negative feedback network,
Amplifying circuit, shaping network；
The differential circuit, on-off circuit, amplifying circuit, shaping network are sequentially connected, the negative feedback network respectively with
Differential circuit and on-off circuit are connected, and direct current biasing module is connected with on-off circuit and amplifying circuit respectively；
Described differential circuit is used for the margin signal for receiving external digital signal；Differential circuit and on-off circuit and it is negative instead
Feedback network is connected, and the square-wave signal edge of extraction is used for the conducting and closing of controlling switch circuit；Negative feedback network and switch electricity
Road is connected, and can so improve the stability of switching tube；
The on-off circuit is used for the square-wave signal for forming a high voltage amplitude；On-off circuit and direct current biasing module phase
Connection, the collector voltage of follower is equal to added direct current biasing module voltage when the switch is closed, when the switch is opened directly
The emitter stage of stream design follower and collector voltage almost equal about zero.It is higher that a voltage amplitude can thus be formed
Square-wave signal.
The amplifying circuit is used for the magnitude of voltage for amplifying output；Ultra-wideband pulse be characterized mainly in that amplifying circuit and its
The design of energy storage inductor.Energy storage inductor is connected with the colelctor electrode of triode Q3 in amplifying circuit, electric for alternating current
The sense resistance larger equivalent to one, therefore there is high voltage gain.The now energy storage when amplifying circuit is in magnifying state
Inductance can store more energy, and output voltage values are larger；Because the pulse width and amplitude of ultra-wideband pulse are mutual a pair
The value of restriction, therefore the energy storage of energy storage inductor is more more more is advantageous to the formation of ultra-wideband pulse；
Described shaping network is used to ultimately form negative ultra-wideband impulse signal, and the amplitude and width of pulse depend on RC
Constant, τ.
Preferably, described differential circuit is connected with the crystal oscillating circuit of outside, includes the electricity being connected successively
Hold C1 and resistance R1, described resistance R1 ground connection.The edge of square-wave signal caused by differential circuit extraction crystal oscillator so that crystal oscillator
Square-wave signal is more beneficial for the triggering of rear class triode, and the width of the pulse signal extracted is determined by RC constants, due to us
It is desirable that wider pulse signal, we make the bottom of pulse signal try one's best to approach with the bottom pulse of crystal oscillation signal here
For 50ns.
Preferably, the negative-feedback circuit is made up of the resistance R3 and electric capacity C2 being connected in parallel, and its input connects
Connect differential circuit, output end connecting valve circuit.Preferably, the on-off circuit includes triode Q1, triode Q2
And resistance R8, the triode Q1 base stage connection differential circuit, grounded emitter, its colelctor electrode and triode Q2 base stage connect
Connect；Resistance R8, triode Q2 base stage connection negative-feedback circuit, current collection are provided between the base stage and colelctor electrode of the triode Q2
Pole connects direct current biasing module, emitter stage connection amplifying circuit.
Preferably, the amplifying circuit includes energy storage inductor L1, resistance R5 and triode Q3, described triode
Q3 its base stage connecting valve circuit, grounded emitter, the connection of its colelctor electrode resistance R5, resistance R5 other end connection energy storage inductor
L1, energy storage inductor L1 other end connection direct current biasing module.
Magnitude of voltage Us on the energy storage inductor L1 is β ib(j ω L+R), wherein β are triode Q3 common emitter times magnification
Number, ω are angular frequency, the i for being exaggerated AC signalbBase current, R when being turned on for triode Q3 are triode Q3 colelctor electrodes
Output resistance.
Preferably, described shaping network is connected with triode Q3 colelctor electrode, including the first differential circuit and
Second differential circuit, the first described differential circuit is by the electric capacity C3 connection resistance R6 groups that are connected with triode Q3 colelctor electrode
Into resistance R6 ground connection；The second described differential circuit is made up of the electric capacity C4 connection resistance R7 being connected with electric capacity C3, and resistance R7 connects
Ground.
Described shaping network is used to the voltage of amplifying circuit output finally giving nanosecond by two stages of differentiation circuit
Ultra-wideband pulse, the bandwidth of pulse by the first differential circuit RC constant, τs1And second differential circuit RC constant, τs2Determine.
Preferably, the protective resistance R4 of ground connection is provided between the on-off circuit and amplifying circuit.
Preferably, the output end of described shaping circuit is provided with build-out resistor R9, for being done during external connection
Matching.
Specific implementation step is as follows：
Square-wave signal passes through differential circuit C1, R1, extracts the edge of square-wave signal, the triode when pulse is in high level
Q1 is turned on, and now triode Q2 is in cut-off state, and triode Q2 base voltages are about 0 equal to triode Q1 emitter voltages；
When pulse is in low level, now triode Q1 ends, and triode Q2 base voltages are equal to the direct current of direct current biasing module
Pressure.Introducing negative feedback network simultaneously makes influence of the change of triode Q2 base voltages to inputting square-wave signal smaller, improves whole
The performance of individual on-off circuit.Triode Q2 as described above penetrates collection follower and base voltage is followed into colelctor electrode, so can be with
A higher square-wave signal of amplitude is obtained, square-wave signal amplifies by triode Q3, us=β ib(j ω L+R) (β is triode
Q3 common emitter multiplication factor, ω are angular frequency, the i for being exaggerated AC signalbIts base current, u when being turned on for triode Q3s
For the magnitude of voltage on energy storage inductor L1, R is Q3 colelctor electrodes output resistance).When pulse is high level, now at energy storage inductor L1
In charged state, with should pulse be low level when, triode Q3 be in cut-off state, and now energy storage inductor L1 is in the shape that discharges
State, AC signal during electric discharge on energy storage inductor L1 form one by the two stages of differentiation circuit of rear class shaping network and discharged back
Road, the voltage waveform on energy storage inductor L1 pass through two stages of differentiation circuit (C3, R6, C4, R7) shaping, it is final we obtain one it is super
Wideband pulse.The amplitude of pulse is determined by the impulse amplitude on the RC constants and L1 of shaping network.
The ultra-wideband impulse signal of this structure, it is simple in construction, cost is low, impulse amplitude is big, pulse width control compares
Easily.The device buying difficulty that overcomes the ultra-wideband pulse generation circuit based on step-recovery diode is big, pulse width can
The shortcomings of tonality is not high.
Brief description of the drawings
Fig. 1 is that ultra-wideband pulse produces block diagram.
Fig. 2 is ultra-wideband pulse generation circuit schematic diagram.
Fig. 3 is the ultra-wideband pulse generation circuit schematic diagram that with the addition of build-out resistor.
Fig. 4 is ultra-wideband pulse simulation result.
Embodiment
In order to further illustrate the effect of technological means that the utility model taken and acquirement, below in conjunction with the accompanying drawings and
Specific embodiment, to the technical solution of the utility model, carry out clear and complete description.Such as the whole ultra-wideband pulse bags of Fig. 1
Include five parts such as on-off circuit, amplifying circuit, differential circuit, direct current biasing module, negative feedback network, shaping network.
Described differential circuit, on-off circuit, amplifying circuit, shaping network, which is sequentially connected, to be connect, and direct current biasing module is to open
Powered-down road and amplifying circuit provide direct current biasing.
First differential circuit is made up of C1 and R1, is connected with the crystal oscillator of outside input, extracts external crystal-controlled oscillation input signal
Edge；Negative feedback network is made up of C2 and R3, substantially reduces influence of the stability to on-off circuit of input waveform, is improved
The stability of on-off circuit.
On-off circuit is used for the voltage for receiving the stabilization of bias voltage offer, and controls the waveform for following circuit；When three poles
Triode Q2 base voltages are about 0 when pipe Q1 is turned on, and when triode Q1 is closed, triode Q2 base voltages are about direct current biasing
Voltage, so we can be obtained by a higher digital square-wave of magnitude of voltage, square-wave signal is formed by triode Q2
Collection follower is penetrated, then the signal for penetrating collection follower is amplified as triode Q3 input signal by amplifying stage, is amplified
Multiple meets：
us=β ib(jωL+R)
(common emitter multiplication factor that β is triode Q3, ω are angular frequency, the i for being exaggerated AC signalbFor triode Q3
Base current, u during conductingsFor the magnitude of voltage on energy storage inductor L1, R is triode Q3 colelctor electrodes output resistance).
Ultra-wideband pulse is to be formed by the output voltage of amplifying circuit by differential circuit shaping, when triode Q3 is turned on
When, u when whole amplifying circuit is in magnifying statece=0 (triode Q3 collector voltages), now energy storage inductor L1, which is in, charges
State, when triode Q3 is in cut-off state, energy storage inductor L1 hinders the reduction of electric current, and energy storage inductor L1 is in electric discharge shape
State.U nowceMagnitude of voltage is approximately equal to energy storage inductor L1 magnitude of voltage (energy storage inductor L1 is equivalent to power supply).uceVoltage passes through two
The shaping of nthdifferential circuit is final, and we obtain the ultra-wideband pulse of nanosecond, and the bandwidth of pulse is determined by RC constant, τs (τ=RC).
Pass through above-mentioned technical proposal, realizes the ultra-wideband impulse signal without DC component, and this ultra-wideband pulse is very suitable
Together in the transmitting of antenna；In addition it is different from traditional ultra-wideband pulse formed using step-recovery diode and avalanche transistor
Circuit, the requirement of the ultra-wideband pulse generation circuit of this structure to device substantially reduce, and this reduces the difficulty entirely designed
Degree and cost.
In above-mentioned utility model implementation process, differential circuit in ultra-wideband pulse generation circuit of the present utility model with
Outside crystal oscillating circuit is connected, and extracts the edge of square-wave signal caused by crystal oscillator so that the square-wave signal of crystal oscillator is more beneficial for
The triggering of rear class triode, the width of the pulse signal extracted has the decision of RC constants, due to us it is desirable that wider
Here we are that bottom pulse of the bottom of pulse signal as far as possible with crystal oscillation signal is close to 50ns to pulse signal.
As described above, the bottom pulse of switching pulse signal is wider, amplifier tube ON time is longer, and the induction charging time gets over
Long, the energy stored in inductance is bigger.When input signal is low level, triode Q1 is in cut-off state, triode Q2
Conducting, amplifying circuit are operated, and now energy storage inductor L1 charges.When input signal is high level, triode Q1 is in and led
Logical state, triode Q2 be in cut-off state, and now energy storage inductor L1 is in discharge condition, the signal process on energy storage inductor L1
The two stages of differentiation circuit discharging of shaping network, shaping network are shaped to the ultra-wideband pulse required for us.
Caused ultra-wideband impulse signal is free of DC component through the above way, particularly suitable for the transmitting of antenna, its
It is secondary that a higher pulse signal of amplitude is disposably formed using energy storage inductor, so it is more beneficial for the shaping of shaping network.
Such as Fig. 3, the result that simulating, verifying is drawn is carried out to above-mentioned principle with ADS, the pulse of input signal is 10M, duty
Square-wave signal than 50%.It is about that -14V pulse widths are about 2ns that impulse amplitude is shown in figure.It can be seen from above-mentioned emulation, this
The ultra-wideband impulse signal amplitude of utility model is higher, and pulse width is about 2ns, can be used as ultra-wideband pulse.
Although the foregoing describing specific embodiment of the present utility model, it should be appreciated to those skilled in the art that this
It is merely illustrative of, a variety of modifications or deformation can be made to these embodiments, without departing from principle of the present utility model
And essence.The scope of the utility model is only limited by the claims that follow.
Claims (10)
- A kind of 1. ultra-wideband pulse generation circuit, it is characterised in that：Differential circuit, on-off circuit, direct current biasing module, negative-feedback Network, amplifying circuit, shaping network；The differential circuit, on-off circuit, amplifying circuit, shaping network are sequentially connected, the negative feedback network respectively with differential Circuit and on-off circuit are connected, and direct current biasing module is connected with on-off circuit and amplifying circuit respectively；Described differential circuit is used for the margin signal for receiving external digital signal；Differential circuit and on-off circuit and negative-feedback net Network is connected, and the square-wave signal edge of extraction is used for the conducting and closing of controlling switch pipe；Negative feedback network is connected with on-off circuit Connect, for improving the stability of switching tube；The on-off circuit is used for the square-wave signal for forming a high voltage amplitude；The amplifying circuit is used for the magnitude of voltage for amplifying output；Described shaping network is used to ultimately form negative ultra-wideband impulse signal.
- A kind of 2. ultra-wideband pulse generation circuit according to claim 1, it is characterised in that：Described differential circuit is successively It is connected with the crystal oscillating circuit of outside, carries including the electric capacity C1 being connected and resistance R1, described resistance R1 ground connection, differential circuit Take the edge of square-wave signal caused by crystal oscillator.
- A kind of 3. ultra-wideband pulse generation circuit according to claim 1, it is characterised in that：The negative-feedback circuit is by simultaneously Join resistance R3 and electric capacity the C2 composition of connection, its input connection differential circuit, output end connecting valve circuit.
- A kind of 4. ultra-wideband pulse generation circuit according to claim 1, it is characterised in that：The on-off circuit includes three Pole pipe Q1, triode Q2 and resistance R8, the triode Q1 base stage connect differential circuit, grounded emitter, its colelctor electrode with Triode Q2 base stage connection；Resistance R8 is provided between the base stage and colelctor electrode of the triode Q2, triode Q2 base stage connects Connect negative-feedback circuit, colelctor electrode connection direct current biasing module, emitter connection amplifying circuit.
- A kind of 5. ultra-wideband pulse generation circuit according to claim 1, it is characterised in that：The amplifying circuit includes storage Can inductance L1, resistance R5 and triode Q3, described triode Q3 its base stage connecting valve circuit, grounded emitter, its current collection Pole connects resistance R5, resistance the R5 other end connection energy storage inductor L1, energy storage inductor L1 other end connection direct current biasing module.
- A kind of 6. ultra-wideband pulse generation circuit according to claim 5, it is characterised in that：On the energy storage inductor L1 Magnitude of voltage Us is β ib(j ω L+R), the common emitter multiplication factor that wherein β is triode Q3, the angle that ω is exaggerated AC signal Frequency, ibBase current, R when being turned on for triode Q3 are triode Q3 colelctor electrode output resistances.
- A kind of 7. ultra-wideband pulse generation circuit according to claim 1, it is characterised in that：Described shaping network and three Pole pipe Q3 colelctor electrode connection, including the first differential circuit and the second differential circuit, the first described differential circuit by with three poles The electric capacity C3 connection resistance R6 compositions of pipe Q3 colelctor electrode connection, resistance R6 ground connection；The second described differential circuit by with electric capacity The electric capacity C4 connection resistance R7 compositions of C3 connections, resistance R7 ground connection.
- A kind of 8. ultra-wideband pulse generation circuit according to claim 7, it is characterised in that：Described shaping network is used for The voltage of amplifying circuit output is finally given into the ultra-wideband pulse of nanosecond by two stages of differentiation circuit, the bandwidth of pulse is by the The RC constant, τs of one differential circuit1And second differential circuit RC constant, τs2Determine.
- A kind of 9. ultra-wideband pulse generation circuit according to claim 1, it is characterised in that：The on-off circuit and amplification The protective resistance R4 of ground connection is provided between circuit.
- A kind of 10. ultra-wideband pulse generation circuit according to claim 1, it is characterised in that：Described shaping circuit Output end is provided with build-out resistor R9.
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| CN201720201349.0U CN206629040U (en) | 2017-03-03 | 2017-03-03 | A kind of ultra-wideband pulse generation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849916A (en) * | 2017-03-03 | 2017-06-13 | 南京邮电大学 | A kind of ultra-wideband pulse produces circuit |
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2017
- 2017-03-03 CN CN201720201349.0U patent/CN206629040U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849916A (en) * | 2017-03-03 | 2017-06-13 | 南京邮电大学 | A kind of ultra-wideband pulse produces circuit |
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Assignee: NANJING YUNDIAN ELECTRONIC TECHNOLOGY Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2020980007040 Denomination of utility model: An ultra wideband pulse generator Granted publication date: 20171110 License type: Common License Record date: 20201023 |