Abstract
This study relates to the review of an important analog electronic function in form of all-pass filter's realization using assorted current conveyor types and their relative performances, which resulted in a novel solution based on a new proposed active element. The study encompasses notable proposals during last the decade or more, and provides a platform for a broader future survey on the topic for enhancing the knowledge penetration amongst the researchers in the specified field. A new active element named EXCCII (Extra-X second generation current conveyor) with buffered output is found in the study along with its use in a new first-order all-pass section, with possible realization using commercially available IC (AD-844) and results.
Highlights
The first-order electronic function which finds a wide range of applications in analog signal processing and signal generation is a network classified under “filters.” It is an all-pass filter, which is called a phase shifter, for its amplitude preserving feature and frequency-dependent phase characteristics
The two features together make it a very powerful electronic function with extensive applications. These range from a simple phase equalizer or phase shifter to more complex ones like signal generation with quadrature or multiphase outputs
Higher order filtering functions can be further realized with the help of this simple electronic function
Summary
The first-order electronic function which finds a wide range of applications in analog signal processing and signal generation is a network classified under “filters.” It is an all-pass filter, which is called a phase shifter, for its amplitude preserving feature (former name) and frequency-dependent phase characteristics (the latter name). Wide, bandwidth and exceptionally high slew rates combined with low voltage and low power implementations of current conveyors makes it an ideal choice for modern applications in analog signal processing. This prompted researchers worldwide to study this function in details. This work is devoted to a review of a repertoire of author’s first-order all-pass filters, more often referred to as all-pass sections, which have appeared in the technical literature little over the last decade This fulfills the motivation of compiling the knowledge contribution by the author in this area, and bringing together many other useful contributions by other researchers as well. The work is expected to further the knowledge in this area and open up new avenues for further research
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