The authors describe an exclusive OR/NOR (XOR) IC which uses O.1 mu m
InAlAs/InGaAs/InP HEMTs for > 40Gbit/s optical transmission systems. T
o obtain high speed operation with small timing jitter, an inductor pe
aking technique is applied to a symmetrical XOR gate. The IC can opera
te at up to 80Gbit/s, and can be used as a 40GHz timing extraction cir
cuit.