Title :
Spectral characteristics of the double loop ΣΔ modulator
Author :
Motamed, Mariam ; Zakhor, Avideh ; Sanders, Seth ; Lee, Te Won
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., California Univ., Berkeley, CA, USA
Abstract :
An important factor affecting the performance of ΣΔ modulators is their tone behavior. A recent approach to alleviate the tone problem consists of moving the open loop poles outside the unit circle. In this paper, we determine the frequency location of two dominant tones as a function of pole location and obtain a partial characterization of the spectral shape. Audio testing along with a series of simulations are then performed to compare the efficacy of pole placement with that of the more traditional tone removal technique of dithering
Keywords :
modulators; pole assignment; sigma-delta modulation; spectral analysis; audio testing; dominant tones; double loop ΣΔ modulator; frequency location; open loop poles; pole location; pole placement; spectral characteristics; tone behavior; Delta modulation; Equations; Frequency; Quantization; Taylor series; Transfer functions;
Conference_Titel :
Circuits and Systems, 1996. ISCAS '96., Connecting the World., 1996 IEEE International Symposium on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3073-0
DOI :
10.1109/ISCAS.1996.539983
