Has anyone looked at the ADA4522 precision op amp from Analog Devices. It
looks very intriguing with it's extremely low offset voltage drift of 22
nV/°C maximum. The offset voltage is as high as 5 uV but this could be
nulled out and it should be very stable over temperature after that. It
could be a great choice for a voltage reference circuit. Looks quite
inexpensive also, although AD only sell in tubes of 96 right now.
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