Model and Simulation of a New Ultra-Narrow Trigger Frequency Alterable Pulse Generator

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 30ps （10%--90%） and falling time of 32ps （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.