Title :
Stable boundaries of a third-order sigma-delta modulator
Author :
Zhang, J. ; Brennan, P.V. ; Jiang, D. ; Vinogradova, E. ; Smith, P.D.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK
Abstract :
This paper studies the stable boundary of a type of third-order one-bit sigma-delta modulator (ΣΔM) using an extended describing function method in which both the amplitude and phase shift of a sampled quantiser are modelled. By determination of the maximum DC input for the feedback coefficients of the sigma-delta modulator, the performance of the system can be optimised for stable modulator operation. This approach is potentially useful in the design and stability analysis of higher-order ΣΔMs.
Keywords :
circuit feedback; circuit stability; quantisation (signal); sigma-delta modulation; amplitude shift; extended describing function method; feedback coefficients; maximum DC input; phase shift; sampled quantiser; stability analysis; stable boundaries; stable modulator operation; third-order sigma-delta modulator; Additive white noise; Delta-sigma modulation; Feedback; Frequency; Noise shaping; Predictive models; Quantization; Sampling methods; Stability analysis; Uncertainty;
Conference_Titel :
Mixed-Signal Design, 2003. Southwest Symposium on
Print_ISBN :
0-7803-7778-8
DOI :
10.1109/SSMSD.2003.1190438
