https://scholars.lib.ntu.edu.tw/handle/123456789/388872
標題: | A TDC-based Two-step Quantizer with Swapper Technique for a Multi-bit Continuous-time Delta-sigma Modulator | 作者: | C.-C. Lin C.-H. Weng T.-A. Wei Y.-Y. Lin TSUNG-HSIEN LIN |
關鍵字: | Delta-sigma modulator; Inherent dynamic element matching (DEM); Time-domain quantizer | 公開日期: | 一月-2014 | 卷: | 61 | 期: | 2 | 起(迄)頁: | 75-79 | 來源出版物: | IEEE Transactions on Circuits and Systems II: Express Briefs | 摘要: | A time-to-digital converter (TDC)-based two-step quantizer is proposed for a multibit continuous-time delta-sigma modulator (CTDSM). In the proposed time-domain quantizer, the barrel-shifting operation realizes the dynamic element matching (DEM) function inherently, eliminating an explicit DEM circuit and the associated circuit latency. The two-step quantization scheme further reduces the hardware and power consumption of a multibit TDC quantizer. A swapper technique, in addition to the inherent DEM, is incorporated to randomize the selection of the two banks of digital-to-analog converter cells, which ensure good linearity. A third-order CTDSM incorporating the proposed TDC-based two-step quantizer is fabricated in a 90-nm CMOS process. The modulator achieves a signal-to-noise-and-distortion ratio of 69.6 dB over a 1-MHz signal bandwidth. Operated from 1.2-V analog and 1-V digital supplies, the whole CTDSM consumes 1.79 mW and achieves a figure of merit of 361 fJ/conversion. © 2014 IEEE. |
URI: | http://scholars.lib.ntu.edu.tw/handle/123456789/388872 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895927288&doi=10.1109%2fTCSII.2013.2291138&partnerID=40&md5=56abbe9bf6fa5050ec73485c12c5081e |
ISSN: | 15497747 | DOI: | 10.1109/TCSII.2013.2291138 | SDG/關鍵字: | Continuous time systems; Delta sigma modulation; Digital to analog conversion; Frequency converters; Signal to noise ratio; Surveying; Time domain analysis; Delta sigma modulator; Dynamic element matching; Figure of merits; Quantization schemes; Quantizers; Signal bandwidth; Signal to noise and distortion ratio; Time to digital converters; Modulators |
顯示於: | 電子工程學研究所 |
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