Document Type thesis Author Name Carter, Nathan R URN etd-0505100-104750 Title A 12-b 50Msample/s Pipeline Analog to Digital Converter Degree MS Department Electrical & Computer Engineering Advisors John A. McNeill, Advisor Len Polizzotto, Committee Member Yusuf Leblebici, Committee Member Keywords digital converter analog flash ADC folding Date of Presentation/Defense 2000-04-24 Availability unrestricted
This thesis focuses on the performace of pipeline converters and their integration on mixed signal processes. With this in mind, a 12-b 50MHz pipeline ADC has been realized in a 0.6um digital CMOS process. The architecture is based on a 1.5-b per stage structure utilizing digital correction for the first six stages. A differeintial switched capacitor circuit consisting of a cascode gm-c op-amp with 250MHz of bandwidth is used for sampling and amplification in each stage. Comparators with an internal offset voltage are used to implement the decision levels required for the 1.5-b per stage structure. Correction of the pipeline is accomplished by measuring the offset and gain of each of the first six stages using subsequent stages. The measured values are used to calculate digtal values the compensate for the inaccuracies of the analog pipeline. Corrected digital values for each stage are stored in the pipeline and used to create corrected output codes. Errors caused by measuring the first six stages using uncalibrated stages are minimized by using extra switching circuitry during calibration.
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