Patent ID: 7199633

Claim:
A method for generating short electric pulses, comprising the steps of generating as a transistor input signal a control pulse, feeding the control pulse to a bipolar transistor which is operated in a common emitter circuit and which subsequently emits an output signal exploiting the charge storage effect of the bipolar transistor by initially directing the bipolar transistor briefly into a state of saturation so that both the base emitter diode and the base collector diode become conductive and so that the base collector space charge region is flooded with minority carriers becoming of low impedance, shutting off the control pulse after a brief period of delay so that the base collector space charge region abruptly becomes high-impedance leading to an abrupt increase in the collector voltage and to an output signal the switch-offside of which is clearly steeper compared to the transistor input signal, and differentiating the output signal with the steep switch-off side so that short primary pulses are generated.