sheldon
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For what its worth,
First, you should not be using op-amps as comparators. They are linear circuits and does always behave well when overdriven. If you want to monitor voltage in continuous- time use a non-latched comparator, i.e., a series of differential stages with a level shifter at the end.
When events occur asynchronously, as in a Switching Regulator, the comparator needs to respond instanteously so being unclocked is good. If the output transistor is frying you don't want to wait for the next clock to turn it off. In applications, like data converters being clocked is acceptable. Clocking[latching] allow you to increase gain, i.e., use regenerative gain, and reduce the likelyhood of metastability.
In general, the input stage of continouos-time comparator is a diff pair, one offset. Depending on the design of the latch comparator, the input could be several matched pairs, more pairs more offset.
Regards,
Sheldon
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