Hi guys, I was reading in a textbook called the "The Art of Electronics". Under Transistors on page 103 it talks about the miller effect (the capacitance between the base and collector), which greatly reduces switching speed (it creates an RC time interval circuit with the Collector load). It has a 3 circuits on page 868 for "beating" the miller effects, 1 of them seems to fit what I'm trying to do, its called the famous "cascode" circuit.
But when I try simulate it with LT spice it performs worse (as in slower switching) than a normal NPN common emitter circuit!
Please see the attached circuit of trying to switch 12V at 5MHz from a 4.5V input signal.
Any ideas what I'm doing wrong?