High-frequency measurement procedure for fully differential building blocks

A procedure is described which allows characterization of fully differential building blocks as a linear four-port. A new set of linear differential hybrid parameters is presented which is well suited to describe fully differential amplifiers. A measurement setup is described which allows determination of the novel differential h-parameters from measured s-parameters obtained with a two-port test set. Measurement results of a 400 MHz fully differential amplifier are presented which demonstrate the new measurement procedure.