On-Wafer Millimeter-Wave Nework Analysis for Device and Circuit Design

A broadband, millimeter-wave on-wafer network analyzer system is necessary for the characterization and design of millimeter-wave devices and circuits. The HP 85109B, 45 MHz to 62.5 GHz, network analyzer system is used to determine the fT, fmax and model parameters of a 0.25 micron MODFET. The system is also used to measure the cutoff frequency and the potential for out-of-band oscillations of a broadband 0.5 to 50 GHz travelling wave amplifier[1]. A criteria is established for the selection of a broadband millimeter-wave network analyzer. Finally, results are demonstrated in measuring devices on-wafer in V-Band (50 to 75 GHz).