FT and RBS-parameter characterization using the common-collector mode

S-parameter measurements using the common-collector mode are described. The common-collector mode is shown on the basis of experimental data to have several advantages over the more widely used common-emitter mode, including simpler biasing, less sensitivity to parasitics, simpler calibration requirements, and applicability to a greater variety of devices. Equations for determining f_T and R_B are given and compared to common-emitter derivations. A previously unreported method for extracting R_B from common-collector measurements is shown and its accuracy discussed