Temperature dependent model is conventionally developed with 1) individual linear model extraction at each temperature and 2) temperature dependence extraction for each model parameter. A novel approach based on a multitemperature optimization is proposed in this study. The new approach is faster and more accurate since the linear models at different temperatures are extracted simultaneously and interrelatedly. It has been found, based on the model extracted, that there is a specific gate-source voltage of Vgs0, where the transconductance (Gm) keeps constant versus temperature. Gm increases (decreases) with temperature for VgsVgs0). With increasing temperature, a substantial decrease in extrinsic inductance is also observed. Our findings are believed to be useful for designing HEMT amplifiers with less temperature dependence.
Analytical analysis on linearity of multi-throw switches is given that serves as design guide. A switch multi-gate switch model is developed that includes all important mechanism associated with linearity, such as CV below pinchoff, leakage between gate to drain/source and drain to source. A highly linear nine-throw switch for GSM/WCDMA applications is used to validate the model that shows an IMD3 of -105 dBm at the control voltages starting as low as 2.8/0 V. This high linearity performance was achieved using good control on CV flatness and leakages in processing.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.