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—This paper presents a third order, single-loop, continuous time 16 modulator with an internal 4-bit quantizer. The modulator is sampled at 500 MHz, and features an oversampling ratio of only 10. Therefore, DAC linearization by dynamic element matching is ineffective, and the DAC nonlinearities are not corrected within the 16 modulator loop but in the(More)
This review covers new experimental and theoretical physical research related to the formation of polymeric membranes by phase separation of a polymer solution, and to the morphology of these membranes. Two main phase separation processes for polymeric membrane formation are discussed: thermally induced phase separation and immersion precipitation. Special(More)
The influence of solid-liquid demixing, liquid-liquid demixing and vitrification on the morphology of polylactide membranes has been investigated. To study the effects of crystallization of polylactides on the membrane formation and morphology, polylactides of varying stereoregularity were used. The polymers applied were poly-L-lactide (PLLA) and copolymers(More)