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We have developed an avalanche transistor-based pulse generator for drivingthe photocathode of an image intensifier, which comprises a mainly capacitiveload on the order of 100 pF. The circuit produces flat-top pulses with risetime of 2 ns, FWHM of 10 ns and amplitude of tens of V at a high repetitionrate in the range of tens of MHz. The generator is built of identical avalanchetransistor sections connected in parallel and triggered in a sequence,synchronized to a reference rf signal. The described circuit and mode ofoperation overcome the power dissipation limit of avalanche transistorgenerators and enable a significant increase of pulse repetition rates. Ourapproach is naturally suited for synchronized imaging applications at low lightlevels.

An avalanche transistor-based nanosecond pulse generator with 25 MHz repetition rate