No Access Submitted: 16 August 2017 Accepted: 16 November 2017 Published Online: 14 December 2017
Review of Scientific Instruments 88, 126105 (2017);
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  • Nikolai Beev
  • Jonas Keller
  • Tanja E. Mehlstäubler
We have developed an avalanche transistor-based pulse generator for driving the photocathode of an image intensifier, which comprises a mainly capacitive load on the order of 100 pF. The circuit produces flat-top pulses with a rise time of 2 ns, a FWHM of 10 ns, and an amplitude of tens of V at a high repetition rate in the range of tens of MHz. The generator is built of identical avalanche transistor sections connected in parallel and triggered in a sequence, synchronized to a reference rf signal. The described circuit and mode of operation overcome the power dissipation limit of avalanche transistor generators and enable a significant increase of pulse repetition rates. Our approach is naturally suited for synchronized imaging applications at low light levels.
We acknowledge financial support from DFG through CRC 1227 (DQ-mat), Project No. B03, and Grant No. ME 3648/1-1. We thank Michael Drewsen of Aarhus University for providing a reference design for a MOSFET-based pulse generator. We are also grateful to Dirk Piester from PTB, Department 4.42, for lending us a fast sampling oscilloscope.