Design of CMOS continuous-time multiple-loop feedback filters.

摘要

The subject of this dissertation is a new design approach for integrated {dollar}gsb{lcub}m{rcub}{dollar}-C filters, the inverse-follow-the-leader feedback (IFLF) topology. This new approach is one of the well-known multiple-loop feedback topologies. The magnitude sensitivity to component variations for IFLF filters is known to be better than that for cascade bandpass filters. For modern applications, such as in hard disc drives and wireless communications, the group delay of the filter is important. However, comparative information about the group delay performance between IFLF and cascade filters is lacking in the literature. This dissertation tries to fill this gap.; By designing integrated {dollar}gsb{lcub}m{rcub}{dollar}-C filters based on the IFLF topology, four important problems are addressed that have not been dealt with comprehensively in the literature; solutions are given in this thesis. One: The design of integrated filters based on multiple-loop feedback topologies. Two: The comparison of sensitivity performances between continuous-time integrated IFLF cascade topologies, both using the {dollar}gsb{lcub}m{rcub}{dollar}-C technique. Three: The design of tuning methods for integrated continuous-time filters. Four: Measurement and simulation of integrated high-frequency fully-differential operational transconductance amplifiers (OTAs) and filters.; The complete design procedures of integrated CMOS {dollar}gsb{lcub}m{rcub}{dollar}-C filters by using the IFLF topology as a vehicle are presented in detail. The results of this research provide a good reference point to industry about the possible risk in realizing multiple-loop feedback filters in general, and the IFLF topology in particular. Complete design method, including transfer function design, OTA design, practical sensitivity analysis and simulations, lay-out techniques, tuning circuit design, test board design, and measurement techniques of integrated high-frequency fully-differential analog circuits, are presented. They can be used as guidelines for practical high-frequency continuous-time filter design.