Applications of MEMS to RF/microwaves wireless communications circuits and systems are presented. The ability of MEMS' fabrication techniques to enhacne the performance of passive components in particular, capacitors, inductors, transmission lines, and switches is addressed. A number of potential wireless system opportunities, in particular, wireless transceivers, routing networks, and tracking antennas for mobile multimedia communications, awaiting the maturation of MEMS are pointed out.
The influence of double-barrier quantum well asymmetry on the switching time of RTDs is studied. For circuit simulation purposes the RTD is modeled as a resistance in series with a parallel combination of a non-linear dependent current source and a non-linear capacitor. The current source embodies an analytic expression for the I(V) characteristics derived from basic principles. The capacitor embodies a C(V) equation derived from a self-consistent numerical two-band model simulation of the structure. It is found that the switching time is most sensitive to asymmetry on the emitter-side barrier, and that the smallest emitter barrier width structure exhibits the smallest switching time.
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