Modeling of wideband decoupling power line for millimeter-wave CMOS circuits

Wideband decoupling for millimeter-wave circuits can be achieved using a transmission line having an extremely low characteristic impedance. The characteristic impedance of such a line can be estimated at high frequencies by measuring the input impedance of open and shorted stubs. However, since the propagation constant cannot be estimated reliably, a circuit model applicable to low frequencies has not yet been established. In this study, we extract the transmission-line parameters at low frequencies and build a circuit model using the RLGC parameters. This model is verified by comparing the results obtained from a circuit simulation and measurement data up to 40 GHz.