| Περίληψη: | Resistorless fractional-order filters can be implemented using active elements with behavior
described by the transconductance parameter (gm), but this solution has the obstacle
that is valid only under small-signal operation conditions. The aim of this M.Sc. Thesis
is to demonstrate a novel concept for the implementation of resistorless fractional-order
basic filters. This can be achieved because the impedance of a fractional-order capacitor
is determined by both a “resistive” and a “capacitive” part.
First of all a theoretical approach of fractional-order basic filter transfer functions is
presented. In addition design examples of resistorless fractional-order filters, which are
implemented with different active elements, is performed in this work.
Some of these filter topologies have been experimentally tested using a CFOA as
active element and a real fractional-order capacitor. Furthermore a CFOA circuit is
introduced not only as schematic design but also as layout design, which have been used
in order to simulate the aforementioned filter structures.
The performance of the proposed filter topologies is verified through simulation results
that have been extracted using Cadence and the Design kit provided by the Austria
Mikro Systeme (AMS) 0.35μm CMOS technology process.
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