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The paper presents an idea together with its experimental realisation of shaping step pulses with picosecond transition time. Shaping circuit is built from several stages, each of them containing Step Recovery Diode (SRD). Time-domain measurement illustrate achieved results. Computer simulation is shown to be useful to predict circuit behaviour .

The paper presents a pulse generator dedicated for time domain relectometry system. The idea of the pulser delivering step pulses with picosecond transition time together with its experimental realization are described. Main features of the presented pulser are: the circuit for shaping output pulses consisting of several stages (each of them containing Step Recovery Diode) connected by inverted microstrip line and the controlled delay of the (also generated) oscilloscope trigger pulses. Time-domain measurement illustrate the achieved results.