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

Proceedings. IEEE Asia-Pacific Conference on ASIC, - Trang 5-8
Cheng-Chung Yang1, Kuan-Dar Chen1, Wen-Chyi Wang1, Tai-Haur Kuo1
1Departmcnt of Electrical Engineering, National Cheng Kung University, Tainan, Taiwan

Tóm tắt

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.

Từ khóa

#Transfer functions #Delta-sigma modulation #H infinity control #Gain #Noise shaping #Cities and towns #Stability analysis #Ear #Linear systems #Signal to noise ratio

Tài liệu tham khảo

tom, 1993, Delta-Sigma Modulation in Fractional-N Frequency Synthesis, IEEE J Solid-State Circuits, 28, 553, 10.1109/4.229400 10.1109/41.904570 10.1109/26.7533 welland, 1991, Delta-sigma modulator with oscillation detect and reset cir-cuit 10.1109/82.275660 kuo, 1998, Instability Recovery Method for Sigma-Delta Modulators 10.1109/82.749090 10.1109/4.974541
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Proceedings. IEEE Asia-Pacific Conference on ASIC,

5-8

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