A quantitative design methodology for high-speed interpolation/averaging ADCs |
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Affiliation: | 1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. School of Microelectronics and Solid-State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China;3. China Academy of Engineering Physics, Chengdu, China;4. OmniVision Technologies, Inc, Shanghai, China;5. Department of Electrical Engineering, University of California, Riverside, CA 92521, USA;1. Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, PA, United States;2. Qualcomm Inc.Inc., San Diego, CA, United States;1. Department of Computer Systems Engineering, University of Engineering and Technology, Peshawar, Pakistan;2. Department of Electrical & Electronics Engineering, Universiti Teknologi PETRONAS, Tronoh, Perak, Malaysia |
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Abstract: | ![]() This paper proposes a new quantitative and systematic design methodology for high-speed interpolation/ averaging ADCs. The methodology consists of a new mathematical BW/gain model derived from the pre-amps arrays static model and new small-signal model, a new offset modeling mechanism that can accurately estimate and help to reduce the offset, and hence a new systematic design flow. The methodology enables a quantitative and systematic analysis, conducts iterative and accurate calculation realized in MATLAB, and finally leads to an optimized ADC design that reaches a guaranteed optimum full-chip performance with given specs (i.e., resolution, speed, input range, power, input CM, etc.). The methodology shows significant advantage over the traditional trial-and-error ADC design approach with respect to performance and design efficiency, and is much more reliable in nanometer technologies. The proposed methodology was fully validated in silicon: a 4-bit 5GSps interpolation/averaging ADC is fabricated in a 65 nm CMOS technology and the measurement results show that our ADC has indeed achieved an outstanding and comparable overall performance compared to reported state-of-the art ADCs. |
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Keywords: | ADC Design methodology Interpolation and averaging Systematic and quantitative model Optimized design |
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