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STM32L151 split powering analog and digital

Question asked by Mr_M_from_G on May 25, 2016
Latest reply on Jun 9, 2016 by Chris T
though I know that ST recommends using the same supply for analog (VDDA, VSSA) and digital (VDD, VSS) there are reasons in my application that make me want an extra analog supply. (My STM32L151 does not have external Vref-pins)
What can happen and how can I help it? Two antiparallel schottky diodes between VDDA and VDD? Other things?

Any information and help ist welcome