An 11-GHz GaAs frequency divider using source-coupled FET Logic

A GaAs one-fourth frequency divider is fabricated to evaluate the ultrahigh-speed performance of source-coupled FET logic (SCFL) having normally-on FET's with small negative V th values. High-transconductance (240 ms/mm) 1/2-µm gate-length FET's and an air-bridge interconnection line technology are successfully developed. A maximum toggle frequency Fmaxof 11 GHz is achieved with a power dissipation of 149 mW. Furthermore, 9.7-GHz Fmaxwith low power dissipation of 52 mW was also obtained.