Fully differential comparator

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Junus2012

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Dear friends,

I have fully differential outputs coming from from fully differential amplifier, I want to compare between them for the purpose of digital offset trimmming,

I have seen some people use two comparator like a window comparator, some use fully differential comparator

my question is that why not using normal comparator and I connect each output from the amplifier to one input of comparator,
why usually people use this type of comparator to compare when variable voltage to a constant voltage connected to the other input. Is there any problem to have differential inputs?

thank you
 

There is no problem. There are influences of
input slew rate and overdrive on input offset
voltage and so on. And non-rail-rail-input
comparators can see the front end cut off
if both inputs head that way (often use
simpler front ends if one input's pinned
voltage can counted on).
 
Dear freebird

I have noticed also that might be another reason of people adopting fully differential comparator, that is because when they use it as a preamplifier to a latch compator, where the latch comparator must have differential inputs which is now coming from the fully differential preamplifier stage

Isn't right

thank you
 

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