An Ultra-Broadband 2-8 GHz GaN HEMT MMIC Active Combiner

In this contribution, a broadband active out-of-phase combiner designed in 0.5 μm GaN-HEMT technology developed by SELEX Sistemi Integrati is presented. The proposed MMIC is based on a distributed approach: exploiting the Drain line sharing, a dummy section and a single stage distributed amplifier, a 13.5 dB average differential gain, together with better than 10 dB input and output return losses and a CMRR better than 30 dB over the 2-8 GHz operating bandwidth are attained. The MMIC size is 2.9×3.3 mm 2. © 2012 IEEE.