An asynchronous sub-two-step quantizer for continuous-time sigma-delta modulators

This paper presents an asynchronous sub-two-step circuit architecture to reduce the complexity and power consumption of internal analog-to-digital converter (quantizer) for Continuous-Time Sigma-Delta Modulator (CTSDM). By using the proposed new circuit topology, only 1/3 of comparators for a 5-...

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Main Authors: Tan, Xiao Liang, Chan, Pak Kwong, Dasgupta, U.
其他作者: School of Electrical and Electronic Engineering
格式: Conference or Workshop Item
語言:English
出版: 2015
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在線閱讀:https://hdl.handle.net/10356/103213
http://hdl.handle.net/10220/25740
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機構: Nanyang Technological University
語言: English
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總結:This paper presents an asynchronous sub-two-step circuit architecture to reduce the complexity and power consumption of internal analog-to-digital converter (quantizer) for Continuous-Time Sigma-Delta Modulator (CTSDM). By using the proposed new circuit topology, only 1/3 of comparators for a 5-bit quantizer design are needed when compared with the conventional flash based counterpart. The proposed quantizer has been implemented and fabricated in a UMC 65-nm CMOS process. The measured results have shown that the quantizer consumes 0.59 mW at an operating frequency of 250 MS/s in a 1.2 V supply and achieves 28.82 dB SNDR (4.5 ENOB) from the output spectrum.