MMIC's for an integrated RF spectrum analyzer front end

The monolithic microwave IC (MMIC) approach for the front end of an RF spectrum analyzer improves interconnection problems due to direct access to a device-under-test (DUT). This paper proposes and demonstrates novel MMIC's for a probe-type, 1-32 GHz spectrum analyzer (SPA) front end. The MMIC's are an up-converter, a variable attenuator, a switch, and a down-converter. This MMIC set utilizes novel FET cells for impedance matching, signal combinations, isolation, and impedance translation to achieve an ultra-wideband performance as well as a remarkable size reduction in an SPA front end