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Question about the w/l of a schmitt trigger

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holddreams

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in a book page 358 ,introduce design of the schmitt trigger,
”A general design rule for selecting the size of M2, that is β2,is to requre that β2≥5β1 and 5β3, since M2 is used as a swith,we requre that it be larger than M1 or M3.”

I donn't understand this completely .Can anyone explain it better?
 

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