CN203278774U - SRD-based second-order differential Gaussian pulse generator - Google Patents
SRD-based second-order differential Gaussian pulse generator Download PDFInfo
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- CN203278774U CN203278774U CN2013202051333U CN201320205133U CN203278774U CN 203278774 U CN203278774 U CN 203278774U CN 2013202051333 U CN2013202051333 U CN 2013202051333U CN 201320205133 U CN201320205133 U CN 201320205133U CN 203278774 U CN203278774 U CN 203278774U
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Abstract
The utility model discloses an SRD-based second-order differential Gaussian pulse generator comprises a clock source, a driving circuit, a differential circuit and an SRD Gaussian narrow pulse generation circuit. Clock excitation signals generated by the clock source passes through the driving circuit, the differential circuit and the SRD Gaussian narrow pulse generation circuit, which are sequentially connected, to from narrow pulse signals. A second-order Gaussian pulse shaping circuit is positioned between the SRD Gaussian narrow pulse generation circuit and a load. The narrow pulse signals, through the second-order Gaussian pulse shaping circuit, outputs sub-nanosecond second-order differential Gaussian pulse signals. The SRD-based second-order differential Gaussian pulse generator has the beneficial effects that the direct-component and low frequency component of the pulse are relatively small; the frequency spectrum utilization rate is high; in addition, since the planar circuit design is adopted, the second-order differential Gaussian pulse generator has simple circuits, is small in size and easy to integrate, and is suitable for short-distance ultra-wideband wireless communication systems.
Description
Technical field
The utility model relates to the pulse signal genration technical field, is specifically related to a kind of second-order differential Gaussian pulse generator based on SRD, and the pulse signal of high radiation efficiency is provided for super broad band radio communication system.
Background technology
Super-broadband tech is a kind of wireless technology of carrying out data communication by the nanosecond narrow pulse signal, in this class communication system, pulse need not to be modulated on carrier wave, but the switch (OOK) of the position (PPM modulation) by modulating pulse, pulse amplitude (PAM), pulse etc. are realized communication.Have the advantages such as two-forty, low-power consumption and low cost due to it, make it at numerous areas such as accurate location, ground penetrating radar, Non-Destructive Testings, bright application prospect be arranged.
In every key technology of ultra-wideband communications, the narrow pulse signal generating technique is the technical problem that receives much concern in the radio circuit research field always.At present, the method for obtaining burst pulse mainly contains two large classes: a class adopts semiconductor integrated circuit, and volume is little, and cost is low, but power capacity is little, frequency response is narrow; The another kind of nonlinear effect of the high speed electronics devices such as avalanche transistor, step recovery diode (SRD), tunnel diode of utilizing produces burst pulse.Wherein, SRD is semiconductor diode the most commonly used in the narrow-pulse generator design, has the advantages such as fast response time, repetition rate height.In the narrow-pulse generator design based on SRD, most designs are used for producing Gaussian pulse, and still, Gaussian pulse has very large DC component, and DC component can not be gone out by aerial radiation, so the availability of frequency spectrum of Gaussian pulse is low.Gaussian pulse is carried out differential, can effectively eliminate DC component, and along with the increase of differential exponent number, the energy spectral density of pulse has improved the availability of frequency spectrum to the high-end movement of frequency.
Document " ULTRAWIDEBAND MONOCYCLE PULSE GENERATOR WITH DUAL RESISTIVE LOADED SHUNT STUBS " (Ma T G, Wu C J, Cheng P K, et al. Ultra-wideband monocycle pulse generator with dual resistive loaded shunt stubs[J]. Microwave and Optical Technology Letters, 2007,49 (2): 459-462.) provided a kind of single order differential narrow-pulse generation circuit based on the SRD cascaded structure.This circuit adopts the two-in-parallel minor matters to obtain the burst pulse of single order differential, and two resistance load and make the ring of pulse less, but the not enough 600mV of the peak-to-peak value of pulse, the voltage transitions rate is lower.
document " NOVEL LOW COST HIGHER ORDER DERIVEACTIVE GAUSSIAN PULSE GERATOR CIRCUIT " (Low Z N, Cheong J H, Law C L. Novel low cost higher order derivative Gaussian pulse generator circuit[C] //Communications Systems, 2004. ICCS 2004. The Ninth International Conference on. IEEE, 2004:30-34.) provided a kind of based on SRD structure generation Gauss burst pulse in parallel, band pass filter by 5 rank is shaped, realized the Gaussian pulse of higher differentiation, but the band pass filter shaping network has increased circuit size, improved cost.
From the current study, voltage transitions rate higher differentiation Gaussian pulse generator high, simple in structure does not also have desirable technical solution.
The utility model content
It is a kind of with the raising availability of frequency spectrum that the purpose of this utility model is to provide, and circuit structure is simple, Pulse symmetry is good, ring is less, is fit to be applied to the second-order differential Gaussian pulse generator based on SRD of short distance super broad band radio communication system.
for solving the problems of the technologies described above, the technical solution adopted in the utility model is, should be based on the second-order differential Gaussian pulse generator of SRD, comprise clock source, drive circuit, differential circuit, SRD Gauss narrow pulse generating circuit, the clock drive signal that is produced by clock source passes through the drive circuit of connection successively, form narrow pulse signal after differential circuit and SRD Gauss narrow pulse generating circuit, second-order differential Gaussian pulse forming circuit is between described SRD Gauss narrow pulse generating circuit and load, described narrow pulse signal is through second-order differential Gaussian pulse forming circuit output subnanosecond level, second-order differential Gaussian pulse signal.
The utility model further improves and is, described clock source adopts active clock oscillator, is made of the output square-wave signal DC power supply DC, clock oscillator and series resistance Rs.
Clock source is selected active crystal oscillator, is made of DC power supply DC, clock oscillator and series resistance Rs; The negativing ending grounding of DC power supply DC, the power end of positive termination clock oscillator, the earth terminal ground connection of clock oscillator, output series resistor Rs, clock oscillator is output as square-wave signal.
The utility model further improves and is, described drive circuit adopts integrated circuit, accelerates rising edge and the trailing edge of active clock oscillator output square-wave signal.
The utility model further improves and is, described differential circuit is made of series capacitance C1 and parallel resistance R1.
Adopt differential circuit to replace DC bias networks, make circuit structure simpler, in order to increase impulse output amplitude, usually need to provide direct current biasing for SRD Gauss narrow pulse generating circuit, differential circuit is produced positive spike during to the high level saltus step by low level at trigger source, trigger source is produced negative spike during to low transition by high level, the positive and negative spike that differential circuit produces is respectively SRD provides forward and reverse bias.
The utility model further improves and is, described SRD Gauss narrow pulse generating circuit is made of step recovery diode SRD1 in parallel, series capacitance C2, parallel resistance R2, series connection step recovery diode SRD2.
Wherein, step recovery diode SRD1 anode is connected with the differential circuit output, negativing ending grounding, series capacitance C2 is used for the coupling between step recovery diode SRD1 and step recovery diode SRD2, resistance R 2 is used for adjusting impedance matching, and this SRD Gauss narrow pulse generating circuit is for generation of narrow pulse signal, and its process that produces narrow pulse signal is as follows: clock signal is high level, step recovery diode SRD1 conducting, load short circuits is output as 0; Clock signal is by high level during to low transition, differential circuit produces negative spike, SRD1 provides reverse bias voltage for step recovery diode, due to the reverse recovery step response of SRD, the trailing edge that has accelerated negative pulse, step recovery diode SRD1 ends rapidly, negative pulse is coupled to step recovery diode SRD2 through capacitor C 2, step recovery diode SRD2 reverse bias produces reverse current and flows through load, forms burst pulse in load.
The utility model further improves and is, described second-order differential Gaussian pulse forming circuit is made of little band short circuit minor matters, series capacitance C3.
Second-order differential Gaussian pulse forming circuit, utilize the reflection characteristic of terminal short circuit microwave transmission line, output at SRD Gauss narrow pulse generating circuit, reflected impulse and output superimposed pulses, first form Impulses, output coupling capacitor C3 has the high-pass filtering characteristic, and this capacitor C 3 and load consist of derivative network, and final reproduced pulse is the second-order differential Gaussian pulse.
The utility model can produce the pulse signal of subnanosecond level second-order differential, because pulse duration on time domain is very narrow, can access abundant harmonic component on frequency domain, its power-10dB bandwidth is 5.6GHz approximately, DC component and the low frequency component of pulse are less, and the availability of frequency spectrum is high, adopt in addition the planar circuit design, circuit is simple, volume is little is easy to integratedly, is fit to the short distance super broad band radio communication system.
Description of drawings
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Fig. 1 is second-order differential pulse generator theory diagram;
Fig. 2 is that the utility model is based on the second-order differential Gaussian pulse generator electrical schematic diagram of SRD;
Fig. 3 is the utility model step recovery diode SRD1 sharpening negative pulse trailing edge waveform;
Fig. 4 is Gauss's narrow pulse waveform figure that the utility model step recovery diode SRD2 forms;
Fig. 5 is the simulation result figure of the utility model complete circuit output pulse waveform;
Fig. 6 is the measured result figure of the utility model complete circuit output pulse waveform;
Wherein: 1-clock source, 2-drive circuit, 3-differential circuit, 4-SRD Gauss narrow pulse generating circuit, 5-second-order differential Gaussian pulse forming circuit, 6-SMA out splice going splice.
Embodiment
As shown in Figure 1, whole circuit is made of clock source 1, drive circuit 2, differential circuit 3, SRD Gauss narrow pulse generating circuit 4, second-order differential Gaussian pulse forming circuit 5, clock source 1 is selected active crystal oscillator, consisted of by DC power supply DC and clock oscillator, the negativing ending grounding of DC power supply DC, the power end of positive termination clock oscillator, the earth terminal ground connection of clock oscillator, the output serial connection is the resistance R s of 10 Ω approximately, and clock oscillator is output as square-wave signal.
As shown in Figure 2, drive circuit 2 input pin connecting resistance Rs, power pin meets DC, earth terminal ground connection, and drive circuit is output as square-wave signal, differential circuit 3 is comprised of series capacitance C1 and parallel resistance R1, differential circuit 3 is serially connected with between drive circuit 2 and SRD Gauss narrow pulse generating circuit 4, and the selection of capacitor C 1 and resistance R 1 circuit parameter needs compromise to consider amplitude, time constant and the impedance matching of differential spike, the final optimization pass value is C1=51pF, R1=150 Ω.
As shown in Figure 2, SRD Gauss narrow pulse generating circuit 4 is made of step recovery diode SRD1, capacitor C 2, resistance R 2 and step recovery diode SRD2, wherein, step recovery diode SRD1 anode is connected with differential circuit 3 outputs, negativing ending grounding, series capacitance C2 is used for the coupling between step recovery diode SRD1 and step recovery diode SRD2, and resistance R 2 is used for adjusting impedance matching, and the value of R2 and C2 is 51pF and 820 Ω respectively.SRD Gauss narrow pulse generating circuit 4 is for generation of narrow pulse signal, and its process that produces narrow pulse signal is as follows, and clock signal is high level, step recovery diode SRD1 conducting, and load short circuits is output as 0; Clock signal is by high level during to low transition, differential circuit 3 produces negative spike, SRD1 provides reverse bias voltage for step recovery diode, due to the reverse recovery step response of SRD, the trailing edge that has accelerated negative pulse, step recovery diode SRD1 ends rapidly, negative pulse is coupled to step recovery diode SRD2 through capacitor C 2, step recovery diode SRD2 reverse bias produces reverse current and flows through load, forms burst pulse in load.
as shown in Figure 2, second-order differential Gaussian pulse forming circuit 5 is between SRD Gauss narrow pulse generating circuit 4 and load, be made of little band short circuit minor matters TL2, capacitor C 3 and 50 Ω microstrip transmission lines, little band short circuit minor matters TL2 one end is connected with step recovery diode SRD2 negative terminal, other end ground connection, appearance value approximately capacitor C 3 one ends of 1pF is connected with step recovery diode SRD2 negative terminal, (RL in accompanying drawing 2 is that the load of 50 Ω is not the microstrip transmission line of 50 Ω to one termination 50 Ω microstrip transmission lines, the microstrip line of 50 Ω is used for and load matched, the microstrip line of RL one termination 50 Ω, other end ground connection) affixed (what accompanying drawing 2 provided is circuit theory diagrams by the SMA coaxial connector at last, when doing design of Simulation, load replaces with RL, SMA is connector, be used for the microstrip line of 50 Ω to the connection of actual test coaxial cable, do not need SMA during emulation, and the circuit board of actual processing, the RL of 50 Ω does not exist, any input impedance is that the system of 50 Ω can be connected to the circuit output end mouth by SMA, SMA just can see in the side circuit plate).second-order differential Gaussian pulse forming process is as follows, step recovery diode SRD2 exports burst pulse, pulse signal transmits through little band minor matters, due to little band minor matters terminal short circuit, the pulse generation reflection, reflected impulse is positive burst pulse, output pulse and reflected impulse superpose at the SRD2 output, form the Gaussian pulse of single order differential, the Gaussian pulse of single order differential is that all input impedance are the system of 50 Ω to load RL load RL(RL representative, such as network analyzer, the devices such as the measuring instrument such as oscilloscope or antenna) transmission, series capacitance can be used as the high pass filter unit of single order, final load obtains picosecond, the Gaussian pulse of second-order differential.
Second-order differential Gaussian pulse production method mainly comprises the following steps:
Produce the clock drive signal by high-precision clock source 1; The pumping signal of clock is from clock source 1, the clock that provides for the outside, consisted of by DC power supply DC and clock oscillator, the clock oscillator frequency of oscillation is 1.8432MHz, direct current supply voltage vcc=3V, when oscillator directly accessed 50 Ω loads (being load RL), output signal was square wave, and peak-to-peak value voltage is 3V.
It is proper noun that drive circuit 2 is selected the NOR gate integrated chip SN74LVC1G02(NOR gate of TI, or do not have the meaning that selection substitutes here, and SN74LVC1G02 is the model of NOR gate), direct current supply voltage vcc=3V, the output square-wave signal, the rising edge of square wave and trailing edge be 1.5ns approximately.
SRD selects the MA44769 step recovery diode of MA-COM, its major parameter comprises: minority carrier life time 10ns, junction capacitance 0.6pF, transit time 150ps, reverse breakdown voltage 30V, SRD Gauss narrow pulse generating circuit 4 is made of two-stage SRD, step recovery diode SRD1 in parallel, the main sharpening edge of a pulse (as shown in Figure 3, the impulse waveform when dotted line in figure represents not have SRD1, solid line represents the impulse waveform after SRD1 in parallel), the existence of SRD1 makes and reaches the 150ps left and right fall time of negative pulse, the width of pulse is mainly decided by series connection step recovery diode SRD2, its course of work is as follows: clock signal is high level, step recovery diode SRD1 forward bias, step recovery diode SRD1 conducting, load short circuits is output as 0, clock signal is by high level during to low transition, differential circuit 3 produces negative spike, SRD1 provides reverse bias voltage for step recovery diode, due to the reverse recovery step response of SRD, the trailing edge that has accelerated negative pulse, step recovery diode SRD1 ends rapidly, negative pulse is coupled to step recovery diode SRD2 through capacitor C 2, step recovery diode SRD2 reverse bias produces reverse current and flows through load, forms burst pulse (as shown in Figure 4) in load.
Second-order differential Gaussian pulse forming circuit 5, utilize the reflection characteristic of terminal short circuit microwave transmission line (being little band short circuit minor matters TL2), output at SRD Gauss narrow pulse generating circuit 4, reflected impulse and output superimposed pulses, first form Impulses, output coupling capacitor C3 has the high-pass filtering characteristic, and this electric capacity and load consist of derivative network, final reproduced pulse is the second-order differential Gaussian pulse, and impulse waveform as shown in Figure 5.
circuit is realized and experimental result: it is 4.2 that the complete second-order differential Gaussian pulse generator based on SRD is produced on relative dielectric constant, on the FR-4 dielectric substrate of thickness 0.6mm, whole circuit size is 25mm * 45mm approximately, adopting the 3V button cell is clock oscillator and drive circuitry, through the coaxial output of SMA connector, use Agilent InfiniiMax 90000 serial oscilloscope paired pulses to carry out time domain measurement, test result as shown in Figure 6, test result shows, pulse generator has formed the second-order differential Gaussian pulse, the pulse peak-to-peak value is 1.2V approximately, the pulse duration of 50% amplitude is 450ps approximately, the ring of pulse is hanged down approximately-17dB, waveform symmetry is better.
Claims (6)
1. second-order differential Gaussian pulse generator based on SRD, comprise clock source (1), drive circuit (2), differential circuit (3), SRD Gauss narrow pulse generating circuit (4), it is characterized in that: the clock drive signal that is produced by clock source (1) passes through the drive circuit (2) of connection successively, form narrow pulse signal after differential circuit (3) and SRD Gauss narrow pulse generating circuit (4), second-order differential Gaussian pulse forming circuit (5) is positioned between described SRD Gauss narrow pulse generating circuit (4) and load, described narrow pulse signal is through second-order differential Gaussian pulse forming circuit (5) output subnanosecond level, second-order differential Gaussian pulse signal.
2. the second-order differential Gaussian pulse generator based on SRD according to claim 1, it is characterized in that: described clock source (1) adopts active clock oscillator, is made of the output square-wave signal DC power supply DC, clock oscillator and series resistance Rs.
3. the second-order differential Gaussian pulse generator based on SRD according to claim 2 is characterized in that: described drive circuit (2) adopts integrated circuit, accelerates rising edge and trailing edge that active clock oscillator is exported square-wave signal.
4. the second-order differential Gaussian pulse generator based on SRD according to claim 3, it is characterized in that: described differential circuit (3) is made of series capacitance C1 and parallel resistance R1.
5. the described second-order differential Gaussian pulse generator based on SRD of according to claim 1 ~ 4 any one is characterized in that: described SRD Gauss narrow pulse generating circuit (4) is made of step recovery diode SRD1 in parallel, series capacitance C2, parallel resistance R2, series connection step recovery diode SRD2.
6. the second-order differential Gaussian pulse generator based on SRD according to claim 5, it is characterized in that: described second-order differential Gaussian pulse forming circuit (5) is made of little band short circuit minor matters, series capacitance C3.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105792254A (en) * | 2016-02-27 | 2016-07-20 | 无锡南理工科技发展有限公司 | Method for preprocessing wireless data by narrow pulse signal |
| CN103227624B (en) * | 2013-04-22 | 2016-08-03 | 李冀 | Second-order differential Gaussian pulse generator based on SRD |
| CN107863943A (en) * | 2017-12-04 | 2018-03-30 | 中国电子科技集团公司第四十研究所 | A kind of Novel resistor bias pulse generator and method for generation |
| WO2019237733A1 (en) * | 2018-06-11 | 2019-12-19 | 南京邮电大学南通研究院有限公司 | Narrow pulse generation circuit used in sequential equivalent sampling system |
-
2013
- 2013-04-22 CN CN2013202051333U patent/CN203278774U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227624B (en) * | 2013-04-22 | 2016-08-03 | 李冀 | Second-order differential Gaussian pulse generator based on SRD |
| CN105792254A (en) * | 2016-02-27 | 2016-07-20 | 无锡南理工科技发展有限公司 | Method for preprocessing wireless data by narrow pulse signal |
| CN107863943A (en) * | 2017-12-04 | 2018-03-30 | 中国电子科技集团公司第四十研究所 | A kind of Novel resistor bias pulse generator and method for generation |
| CN107863943B (en) * | 2017-12-04 | 2020-10-27 | 中国电子科技集团公司第四十一研究所 | Resistance bias pulse generator and generation method |
| WO2019237733A1 (en) * | 2018-06-11 | 2019-12-19 | 南京邮电大学南通研究院有限公司 | Narrow pulse generation circuit used in sequential equivalent sampling system |
| US11309871B2 (en) | 2018-06-11 | 2022-04-19 | Nantong Institute of Nanjing University of Posts and Telecommunications Co., Ltd. | Narrow pulse generation circuit used in sequential equivalent sampling system |
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Granted publication date: 20131106 Effective date of abandoning: 20160803 |
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