A 1 . 5 – 9 . 6 GHz Monolithic Active Quasi-Circulator in 0 . 18 � � CMOS Technology

An active quasi-circulator MMIC was designed and fabricated in a standard 0.18CMOS technology. The quasicirculator combines common-source, common-gate, and commondrain configurations to improve the isolation between ports, and has an insertion loss less than 6 dB and an isolation better than 18 dB over 1.5–9.6 GHz.

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