Polyphase Decomposition for Tunable Band-Pass Sigma-Delta A/D Converters

被引：6
作者：
Feng, Da [1 ]
Maloberti, Franco [2 ]
Sin, Sai-Weng [1 ]
Martins, Rui Paulo [1 ]
机构：
[1] Univ Macau, State Key Lab Analog & Mixed Signal VLSI & FST EC, Macau, Peoples R China
[2] Univ Pavia, Dept Elect Comp & Biomed Engn, I-27100 Pavia, Italy
来源：
IEEE JOURNAL ON EMERGING AND SELECTED TOPICS IN CIRCUITS AND SYSTEMS | 2015年 / 5卷 / 04期
关键词：
Band-pass; noise transfer function; polyphase decomposition; sigma-delta modulators; tunability; MODULATOR; MHZ; ADC; DB; GAIN; BW;
D O I：
10.1109/JETCAS.2015.2502158
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The use of the polyphase decomposition technique applied to the noise transfer function (NTF) of band-pass sigma-delta (BP Sigma Delta) modulators is introduced and theoretically analyzed. Schemes for a second-order and fourth-order band-pass noise shaping are discussed in detail. The method is usable for any order but the analog inaccuracy limits its application. It is shown that an extension to MASH configurations is possible. The method allows tunability of the centre frequency over a wide frequency range. Moreover, MASH schemes allow a rough-fine tuning with the rough tuning in the analog section followed by a fine digital adjustment. Simulation results verify the benefits and outline possible limits.
引用
收藏
页码：537 / 547
页数：11
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