Berti
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Because the non-overlapping time reduces the settling time I would recommend to design for a short non-overlap time. However, you need to make sure that the phases never overlap to avoid charge-sharing (also in presence of process/temperature variations, jitter etc.) However, if you clock frequency is low the non-overlap time is not that critical since it has only a small contribution to the overall settling time (and I would add more margin).
Regards
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