Anybody knows how to calculate the random input offset voltage of the folded-cascode operational amplifier by hand?
I need to find 3sigma offset, knowing sigma beta and sigma threshold according to the Pelgrom model.
If you know some literature, please tell me.
Thank you.
mm...
I think Razavi' book is very clear, reference the chapter about nonlinearity and match.
For folded cascode, the offset are mainly from input pairs and active current source.
Check the book Design of Low-Voltage Low-Power Operational Amplifier Cells by Ron Hogervorst. Also check this pdf. It has all the Pelgrom's equations and offset equations for the folded cascode OTA.