2022-10-22 10:34 Status: # Slew Rate Classical Opamp is a class A circuit - biased with a constant bias current in a [differential pair](Differential%20Pair.md).  Since there is a relatively high gain in the second stage, to change the output voltage the voltage across the compensation capacitor must change also (since the input and output are the nodes across this capacitor and the input moves a little bit, the output moves alot more due to the gain). If we apply a large input voltage, the max current that can flow into the compensation capacitor is the bias current. Thus the max dV/dT is IB/Cc  This is approximately the output voltage rate of change, or slew rate.  ## Other SR Limiting Factors ### Output Capacitor The rising (positive) slew rate may also be limited by the capacity of the op amp to charge the load capacitor.  It is **not** a limiting factor in the negative range, since discharging the load capacitor we have a larger current capacity (through the lower FET) since it isn't biased with a constant current. [^1] --- # References [^1]: [vr-4602-wk05-sc02-opampgainbw](../../Spaces/University/ELEC4602%20–%20Microelectronics%20Design%20and%20Technology/Lectures/W4/vr-4602-wk05-sc02-opampgainbw.mp4)