A 6–12 GHz Reconfigurable Transformer-Based Outphasing Combiner in 250-nm GaAs

This paper presents a frequency-reconfigurable out-phasing power combining network implemented in 250-nm GaAs. The MMIC combiner design is a broadside-coupled transformer with shunt reactance elements implemented using a transmission line with shunt switches. The sixteen switches enable reconfiguration of the impedance trajectories presented to the two input ports. For selected switch states, the combining network presents appropriate input impedance trajectories for outphasing operation over a 6 to 12 GHz range with extended operation to 14 GHz.