TTL gates are from mid 60's. More advanced series, F ror example are from 80's. It is 25 years of steady progres. Today's CPU are manifactured at diferent technology - some kind of BiCMOS proces as far as I know. For 20years transistor dimensions are shrink about a 100 times. This mean dramatic reduce of parasitic capacitance, inductance and propagation times. For hi end application GaAs transistor are used. They have supirior frequency performance .
Hi,
the length of the transistors are being reduced (now it is 90nm standard) and the problems of capacitances are being effectively handles so it is not surprising for high speed processotrs.
br madhukar
In fact there is quite fast transistors in labs. On the other hand, there is a way to design amplifier, wich have frequency band higher than transistor's transit frequency.
Question can have a sense if we analyse exact type of transistor but in a global technology its in a big progress and every day transistors are smaller and smaller ... One extra things its that many of high freq. devices work with distributed parameters(>300MHz) and its different philosophie of work ... Last thing its only my opininon and I would be like that somebody write some sentenc about that ...