Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
If you are talking about "IC design" then the thread should be moved to the according section.
In other case:
20mV should be no problem for most comparators.
If you want it more accurate ... just in regards of voltage level ... you should consult a selection guide to find a suitable comparator.
But low overdrive usually means increased switching delay times and high rise/fall times.
If this may cause a problem then consider to use a (fast) Opamp to amplify the signal before you feed the comparator.
But with Opamps another problem may arise: with too high input signal the output of the Opamp may saturate at the supply rail.
Many Opamps suffer from increased delay coming out of saturation. Which sadly increases overalll switching time (and making it non constant: fast when not saturated, slow when saturated. Strange things may happen).
You then should use feedbacked clamping at the Opamp, maybe with fast, low capacitance zeners.
Don't use standard zeners, because they have relatively high capacitance.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.