Hi, I am currently looking at the LT1677/1678/1679 family of opamps, which have an increadibly low tempco for the input offset voltage (0.4µV/°C typ). Ie they are not that far of from chopper/auto-zero opamps (only a factor of 20-50), but with a quite a bit lower noise. And more imporantly, they do not have the noise peak in the 0.1-10MHz region these zero-drift opamps are plagued with.
But, when the input voltage comes close within the upper or lower rail, the input offset voltage specs get much worse. Which is ok, as I am not so much interested in the absolute offset as its drift. But is my assumption correct, that with worse offset spec, close to the rails, also the offset voltage drift specs get worse? Another question I have is, whether I am just fooling myself with the noise spec. If I am mainly interested in the noise performance in the range between 0.1Hz and 100Hz (maybe even just up to 10Hz), are the LT167x a good choice? Or should I rather stick to the LTC2057? (Yes, there is still the option of using an LT1677 and an LT2057 to compensate its offset. But I don't want to go that way due to the increase of complexity...at least not yet) Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.