Title :
An improved approach to stability analysis of fixed-point digital control systems under finite word length effects
Author_Institution :
Dept. of Photonics & Commun. Eng., Asia Univ., Taichung, Taiwan
Abstract :
This paper presents an improved approach to analyze the stability of the digital closed-loop control systems under finite word-length (FWL) effects. This approach can effectively evaluate the least bits that the digital controllers should be implemented to preserve the stability of the closed-loop systems. The conservativeness in the stability analysis in terms of word length can be released by using normal-form transformation. Finally, the numerical simulations will be provided to verify the proposed approach.
Keywords :
closed loop systems; digital control; fixed point arithmetic; roundoff errors; stability; digital closed-loop control systems; digital controllers; finite word length effects; least bits; normal-form transformation; stability analysis; Circuit stability; Computers; Control systems; Numerical simulation; Numerical stability; Stability criteria; closed-loop; finite word-length (FWL); normal-form; stability criterion;
Conference_Titel :
SICE Annual Conference 2010, Proceedings of
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-7642-8
