Monolithic Active Resonator Filters for High Frequencies

摘要

This doctoral thesis deals with monolithic active resonators and their use inhigh-frequency filters. The emphasis has been put on noise and distortion properties of active resonators, as these are crucial in potential applications. Two active resonator types are considered: passive I.C. resonators with active negative resistance compensation, and gyrator-based active inductor resonators. An introduction to the theory of passive resonators is given, and the basic quality factor and noise characteristics are discussed in detail. Filter structure based on parallel resonators are studied and techniques for frequency tuning briefly introduced. Based on a three-port equivalent, different negative resistor structures suitable for integration are categorized, and their fundamental small-signal and tuning properties derived. The noise properties of the topologies are analyzed and compared. The Volterra-series method is applied in the distortion estimations for each negative resistor type. Practical examples of integrated negative resistor are given with realistic measured data.