); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Operating an opamp in saturation for extended periods in a precision circuit is a bad idea, as the changes in dissipation of the various devices in the opamp will change the opamp input offset voltage when it comes out of saturation. Even though modern opamps use cross coupled quads and other layout symmetry techniques to greatly reduce the thermal feedback on the chip, the effect is still finite. With input frequencies above a few kHz the thermal feedback isn't significant, however with the low frequencies typically used in this application thermal feedback is significant. Thermal feedback is reduced by keeping the opamp out of saturation and limiting the output swing to minimise the change in the power dissipation in the output stage transistors.
Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
