Operation of The Drift Step Recovery Diode (DSRD)
Drift Step Recovery Diode (DSRD)has been discovered by Russian scientists in 1981 (Grekhov et al., 1981).
The Principle of the DSRD operation is similar to the SRD. However there is an essential difference - the forward pumping current should be pulsed, not continuous, because drift diodes function with slow carriers.
The principle of DSRD operation can be explained as follows: Short pulse of current is applied in the forward direction of the DSRD effectively "pumping" the P-N junction, or in other words, “charging” the P-N junction capacitively. When the current direction reverses, the accumulated charges are removed from the base region. As soon as the accumulated charge decreases to zero, the diode opens rapidly. A high voltage spike can appear due to the self-induction of the diode circuit. The larger the commutation current and the shorter the transition from forward to reverse conduction, the higher the pulse amplitude and efficiency of the pulse generator (Kardo-Sysoev et al., 1997).
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