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how sensitive can comparator be?

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liletian

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Hi Guys
How sensitive can comparator be? for operate in Mhz, can it pick out a sginal different for 0.1 mv or small? Where can I find a good refernece about it?
Thanks
 

Is that for A/D converters?

John and Martin's Analog IC Design
Baker's Mixed Signal IC Design
 

dumbfrog said:
Is that for A/D converters?

John and Martin's Analog IC Design
Baker's Mixed Signal IC Design
Click to expand...
yes, it is a very simple ADC, are there some online papers about comparator design?
Thanks a lot
 

Generally, comparators have gains that make the input offset voltage equal the output logic high.
 

You can refer to chapter 7 in John and Martin's Analog IC Design.
The design in fig. 7.17 is able to achieve 0.1mv resolution at 2MHz clock freq.
 

ytliang said:
You can refer to chapter 7 in John and Martin's Analog IC Design.
The design in fig. 7.17 is able to achieve 0.1mv resolution at 2MHz clock freq.
Click to expand...
This is great, do you by any chance know the power comsumption? It seems comparator is not a very active research topic and there is no recently publications.
Thanks
 

liletian said:
This is great, do you by any chance know the power comsumption? It seems comparator is not a very active research topic and there is no recently publications.
Thanks
Click to expand...
I think you should be able to design one below 0.5mW.

Check out this paper "Design Techniques for High-Speed, High-Resolution Comparators" by Razavi & Wooley
 

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