Voltage overdrive touch keep drain each will Offset voltage input op amp Operation with a common-mode input voltage
Input referred voltage noise power spectral density vs. gate overdrive
Op-amp: input offset voltage explained Input referred voltage noise power spectral density vs. gate overdrive Voltage overdrive noise referred spectral

Input referred voltage noise power spectral density vs. gate overdrive
Operation with a Common-Mode Input voltage - Keep In Touch

Op-Amp: Input Offset Voltage Explained - YouTube