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Complex Filters As Cascade Of Buffered Gingell Structures: Design From Band-Pass Constraints, Nicole M. Hay
Complex Filters As Cascade Of Buffered Gingell Structures: Design From Band-Pass Constraints, Nicole M. Hay
Master's Theses
Complex filters are multi-input, multi-output networks designed to discriminate based upon the relative phase difference between input signals. Complex filters find application in modern wireless systems for single sideband transmission and image-reject reception. This thesis presents one active complex filter implementation using two operational amplifiers per stage, termed “type-II” topology. The “type-II” originates from the passive RC-CR polyphase topology presented by Gingell in his 1973 paper, “Single sideband modulation using sequence asymmetric polyphase networks.” This new topology gains several advantages over existing complex filter implementations, namely “cascadability” (multiple sections placed in series to create a higher-order response) without altering the …
Complex Filters As As A Cascade Of Of Buffered Gingell Structures: Design From From Band-Stop Constraints, Samuel Robert Johnston
Complex Filters As As A Cascade Of Of Buffered Gingell Structures: Design From From Band-Stop Constraints, Samuel Robert Johnston
Master's Theses
This thesis presents an active Complex Filter implementation that that creates a transfer function with with a single real pole and a complex zero. The two-input/two-output network developed in in this thesis responds differently based upon upon the relative phase difference of of the two inputs. If a negative ninety-degree phase difference occurs between the two inputs, the filter will exhibits a bandstop response. While a positive ninety-degree phase difference exhibits a bandpass response. This topology is relatesd to to Gingell’s RC-CR polyphase topology but because of of the use of of op-amps, can be cascadedd without without suffering loading …