Continuous-Time Incremental Delta Sigma Data Converter
Date Issued
2014
Date
2014
Author(s)
Wang, Ting-Yang
Abstract
Incremental sigma-delta data converter (IDC) has many useful applications such as DC measurement, linear feet measurement, biomedical application, sensor array application, and is suitable for any multi-channel applications. Most of the IDC today is made by discrete-time (DT) structure. But continuous-time (CT) structure consumes much less power than DT one, since continuous ramping instead of discrete settling behavior is involved in CT loop-filters. This thesis use CT structure to make the modulator faster and consume less power. A third order 3-bit CT-IDC with OSR=64 fabricated in TSMC T18 1P6M technology is proposed in the thesis. The modulator is operated at 100MHz sampling clock. It achieves peak SNDR of 73.82dB within 737 kHz bandwidth. This chip dissipates 6.6 mA from a 3.3V supply. The core area of this modulator occupies smaller than 0.25mm2.
Subjects
增量型三角積分調變器
離散時間
連續時間
Type
thesis
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