Not much anymore. You're living in the past ;-) when process variations were much greater.
Manufacturer to manufacturer... now that's a different story.
Jan doesn't understand that what happens in a typical RF stage, AGC'd that way, is the input impedance pads down the gain.
Not a chance, I don't rely on beta period!
...Jim Thompson
I did a 3-opamp 6-pole SK filter with AD8628s. That seems to be an especially bad configuration... one opamp input has a cap to ground and the other input connects to the output (unity-gain follower.) I got something like 5 uv offset per amp. Had to add a tiny trimpot to tweak the overall offset to zero. This was for some little plug-in filter boardlets.
Next time, I'll breadboard anything critical that uses a chopamp; the data sheets don't generally mention charge injection.
Sometimes they do come clean, e.g.
Cheers
Phil Hobbs
Thanks. The paint can is cool.
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