The operation of Pichugin pulse generators (named after their
Russian inventor) is studied. A set of equations for a one-stage
generator enables us to point up the important frequency properties
of the magnetic core transformer. An analytical and numerical
study of a three-stage generator is performed. Improvements,
concerning the voltage gain, are suggested; the consequences
on the rise time value are analysed. A new conception method,
based on compensated and asymmetrical stages, is proposed. It
is a compromise solution to decrease the rise time value and
to increase the voltage gain. By using this structure, the realization
of a 120 kV, 145 ns rise time three-stage pulser is proposed; its
operating at a frequency greater than 1 kHz is studied.