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The brief discusses the harmonic distortion introduced by the differential input adapter commonly used in flash and folding A/D converters operating without Sample and Hold. A distributed model of the adapter is proposed, which provides physical insight and allows quantitative evaluation. Moreover, a technique based on a feedforward compensation is presented. It provides a significant reduction of the harmonic distortion with a small increase of the die area. Index Terms - Analog-digital conversion, harmonic distortion, high-speed integrated circuits.

Separation of wastewater split streams and utilization of the resources contained therein are an important prerequisite for a sustainable wastewater treatment. In areas with existing infrastructures, this leads to transition states during which current systems must continue to operate. A simple mass-flow based method was developed to assess the impacts of an incremental transition (co-digestion of blackwater and sewage sludge) upon plant operation. The results proved that blackwater co-digestion could be easily integrated into existing wastewater infrastructures; however, beyond 8% transition thickening was required due to hydraulic limitations in the digester. Additionally, nitrogen recovery was necessary beyond 35% transition to avoid unfavorable C:N ratios. The investigated concept also led to a power gain of 11 kWh/(PE∙a) due to enhanced biogas production and aeration savings. The developed Excel-based method was considered suitable for evaluating the benefits and probable tipping points for plant operation during transition to source-separated sanitation systems. [ABSTRACT FROM AUTHOR]