Monolithic RF circuits capable of operating over multiple frequency bands are highly desired due to popular demand for low cost and compact multiband radios. This thesis presents designs of one such RF circuit called LNA. The presented LNAs are frequency reconfigurable tuned amplifiers i.e. they are narrow band circuits whose frequency of operation can be dynamically changed. The frequency reconfigurability is achieved by the use of monolithic CMOS-MEMS passives.;All the circuits have been designed in Jazz 0.35 microm 60 GHz BiCMOS process. The presented LNAs consume a mere 2.5 mW of power and deliver a NF under 3 dB. The performance of the LNAs presented in this thesis has also been compared, using a FOM (= S21/(NF* Power)), with the frequency reconfigurable LNAs reported in the literature so far. Based on this FOM the presented LNAs are better compared to the LNAs from even more advanced Si based technologies.;In this thesis all the possible configurations obtained by adding a single varactor to the input and the output of an emitter degenerated cascode LNA core has been analyzed. Low noise, low power, input match, frequency reconfigurability, and monolithic implementation were the main constraints to determine the acceptability of an configuration. Three acceptable configurations have been identified and circuit designs based on these configurations has been presented. Circuits have been designed using a methodology developed during this work. The methodology designs for good noise and power matching at the input, over the entire frequency range of operation, and under a DC power constraint.
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