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Transfer function design of stable high-order sigma-delta modulators with root locus inside unit circle

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4 Author(s)
Cheng-Chung Yang ; Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan ; Kuan-Dar Chen ; Wen-Chyi Wang ; Tai-Haur Kuo

In this paper, a systematic method to design stable high-order sigma-delta modulator (SDM) transfer functions, with no need of stability mechanisms, is proposed. It is shown that a high-order SDM can be absolutely stable if the departure angles of the root locus of its noise-shaping function are properly designed. Tradeoffs between stability and performance of the SDMs are presented.

Published in:

ASIC, 2002. Proceedings. 2002 IEEE Asia-Pacific Conference on

Date of Conference:

2002

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