This is basically what FPGAs offer, although above 1GHz the transceiver design becomes difficult and expensive. 1GHz should be possible on hobbyist-priced parts.
100GHz is .. well, can anyone find any part with that capability? Seems to top out around 10GHz for ethernet transceivers.
100GHz is .. well, can anyone find any part with that capability? Seems to top out around 10GHz for ethernet transceivers.