Novel MMIC source-impedance tuners for on-wafer microwave noise-parameter measurements

Novel monolithic-microwave integrated-circuit source-impedance tuners for use in on-wafer noise-parameter measurement systems are reported, which can be incorporated into a wafer probe tip. These eliminate the effect of cable and probe losses on the magnitude of a reflection coefficient that can be presented to the input of an on-wafer test device, thus enabling higher magnitudes to be synthesized than for conventional tuners, and with the potential of increasing noise-parameter measurement accuracy.