Digital filter structures having low errors and simple hardware implementation

Sensitivity and roundoff errors can seriously limit the application of recursive digital filters in practice, particularly when the filters have poles near z = + 1 . A filter structure, based on digital incremental computers is proposed, which has low sensitivity, good error characteristics, and sim...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems 1978-08, Vol.25 (8), p.593-599
Main Authors: Abu-El-Haija, A., Shenoi, K., Peterson, A.
Format: Article
Language:English
Subjects:
Arithmetic
Astronomy
Computer errors
Digital filters
Hardware
Limit-cycles
Radar
Roundoff errors
Transfer functions
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Summary:Sensitivity and roundoff errors can seriously limit the application of recursive digital filters in practice, particularly when the filters have poles near z = + 1 . A filter structure, based on digital incremental computers is proposed, which has low sensitivity, good error characteristics, and simple hardware implementation for pole locations close to z = + 1 . Expressions for the roundoff errors are derived and compared to those for conventional structures. A design procedure is suggested to implement the new filter structure given the transfer function. Simulation results are presented.
ISSN:0098-4094
1558-1276
DOI:10.1109/TCS.1978.1084522