The Blumlein pulse generator consists in:
----R----o---=============--RL--=============-- | | Vdc / sw Zo,Td Zo,Td | | ---------o---=============------=============--
Both transmission lines are slowly charged to Vdc through a biggish R. Then, the switch closes and generates a pulse across RL with amplitude Vdc and width 2*Td. If the switch is ideal, a square pulse is obtained. If the switch closes slowly, you get a triangular pulse resulting from the superposition of the slow edges.
Some years ago I played with this circuit using a BFR83a (?) as a switch and I remember that the pulses (~500 ps) were limited by slow switching. In the next days I will try with a BFP405, which I have by the bucket, but I perhaps there might be better alternatives. So, the question is: which device would you suggest for a fast _falling_ edge? (I guess that strict RF performance is _not_ the key point to look at in this case).
The ideal objective would be get 100 ps pulses with amplitude in the 2-5 V range (although higher values would be welcome).
Pere