A novel efficient circuit for Ultra-WideBand(UWB) balanced sub-nanosecond monocycle pulse generation is presented.The pulse generator employs wideband bipolar transistor,step recovery diodes,Schottky diodes,and simple...A novel efficient circuit for Ultra-WideBand(UWB) balanced sub-nanosecond monocycle pulse generation is presented.The pulse generator employs wideband bipolar transistor,step recovery diodes,Schottky diodes,and simple charging and discharging circuitry.Simple transient analysis and design of the circuit are presented along with their operating principle.The pulse generator produces truly balanced monocycle pulse with 500 ps pulse-width and 800 mV peak voltage.The generated monocycle pulse also has very symmetrical positive and negative portions and low ringing level.The presented pulse generator can be used as both a transmitter feeding UWB balanced antennas without broadband baluns and a balanced switching pulse generator that used in UWB receiver.展开更多
The worst of times may have passed with better-than-expected economic results in the first quarter The National Bureau of Statistics (NBS) published the economic performance figures for the first quarter of this year ...The worst of times may have passed with better-than-expected economic results in the first quarter The National Bureau of Statistics (NBS) published the economic performance figures for the first quarter of this year on April 16.展开更多
Two new kinds of ultra-narrow trigger frequency alterable picosecond pulse generator are presented.One can produce positive pulses and the other can produce negative pulses.The two pulse generators are subdivided into...Two new kinds of ultra-narrow trigger frequency alterable picosecond pulse generator are presented.One can produce positive pulses and the other can produce negative pulses.The two pulse generators are subdivided into three parts:signal driving circuit,differentiator network and pulse shaping circuit.The pulse shaping circuit is made of step recovery diode(SRD) and short-circuit microstrip line.A positive pulse with width of 54 ps(50%-50%),rising time of 30 ps(10%-90%) and falling time of 32 ps(90%-10%),and a negative pulse with width of 54 ps(50%-50%),rising time of 30 ps(90%-10%) and falling time of 30 ps(10%-90%) are achieved in simulation.All of the components are ready-made and inexpensive.They can be applied in ultra-wideband(UWB) communication system,such as transmitters and receivers.展开更多
文摘A novel efficient circuit for Ultra-WideBand(UWB) balanced sub-nanosecond monocycle pulse generation is presented.The pulse generator employs wideband bipolar transistor,step recovery diodes,Schottky diodes,and simple charging and discharging circuitry.Simple transient analysis and design of the circuit are presented along with their operating principle.The pulse generator produces truly balanced monocycle pulse with 500 ps pulse-width and 800 mV peak voltage.The generated monocycle pulse also has very symmetrical positive and negative portions and low ringing level.The presented pulse generator can be used as both a transmitter feeding UWB balanced antennas without broadband baluns and a balanced switching pulse generator that used in UWB receiver.
文摘The worst of times may have passed with better-than-expected economic results in the first quarter The National Bureau of Statistics (NBS) published the economic performance figures for the first quarter of this year on April 16.
基金the National Natural Science Foundation of China (No.60970058)the Natural Science Foundation of Jiangsu Province (No.SBK200930425)+1 种基金the fund of the State Key Laboratory of Millimetre Waves of Southeast Universitythe Student Research Training Program (SRTP) of Southeast University
文摘Two new kinds of ultra-narrow trigger frequency alterable picosecond pulse generator are presented.One can produce positive pulses and the other can produce negative pulses.The two pulse generators are subdivided into three parts:signal driving circuit,differentiator network and pulse shaping circuit.The pulse shaping circuit is made of step recovery diode(SRD) and short-circuit microstrip line.A positive pulse with width of 54 ps(50%-50%),rising time of 30 ps(10%-90%) and falling time of 32 ps(90%-10%),and a negative pulse with width of 54 ps(50%-50%),rising time of 30 ps(90%-10%) and falling time of 30 ps(10%-90%) are achieved in simulation.All of the components are ready-made and inexpensive.They can be applied in ultra-wideband(UWB) communication system,such as transmitters and receivers.
