Berti
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You need the seperate your circuit blocks into agressors and victims. Since the comparator decision might be influence by spikes on the supply I usually connect the comparator to the analog supply (and provide local decoupling to avoid switching noise propagate through the circuit). The pad-ring is usually splited in an analog and a digital section (or even more sections for larger chips). However, if you don't want to split the pad-ring you can still supply the pad-ring with a seperate supply and provide analog and digital supply directly to the core.
Hope this helps, regards.
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