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asymmetric differential mosfet as input pairs to implement a comparator? hysteresis?

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ivyahoney

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Hi,

Here is my question of a analog comparator with its input differential pair of different single width but of the same total width (different fingers). And there is no symmetry of the differential pair on the layout.

so why does it happen? I am learning this circuit from an experienced designer. Please anyone be kind to help to give me a hint about this comparator structure. Is it to make hysteresis or something else? Why needs the asymmetric layout

Thanks a lot!:smile:
 

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