Over-60-GHz operation of SCFL dynamic frequency divider using InP-based HEMTs

A toggle operation of 39 to 63.5 GHz has been achieved by a digital dynamic frequency divider. The frequency divider employs a pair of clocked inverters with source coupled FET logic (SCFL) and uses 0.1-/spl mu/m-gate InAlAs/InGaAs/InP HEMTs with high uniformity and performance. On a 2-in. wafer the frequency divider showed a maximum toggle frequency of 59.1/spl plusmn/3.3 GHz with a fabrication yield of 89%. This is the highest operation frequency yet obtained by a broadband digital frequency divider.