A base-current drive technique for saturating B.J.T´s

A method of generating pulses of base current, for both the switch-on and switch-off phases of a common-emitter saturating b.j.t. switch, that avoids the use of the familiar "speed-up" capacitor is described. The method is used to produce, with long-established devices, voltage pulses of adjustable amplitude, and edge speeds faster than 1 V/ns.