13_Taming Oscillations—the capacitive load problem Taming Oscillations—the capacitive load problem Bruce Trump We’ve been looking at stability of op amps, considering how phase shift (or call it delay) in the feedback path can cause problems. Picking up from last week, stability with a capacitive load is a tricky case. If you’re joining us late, you may want to first read the previous two blogs, Why Oscillations and Taming Oscillations. The trouble maker, open-loop output resistance (Ro) of the op amp, is not actually a resistor inside the op amp. It’s an equivalent resistance dependent on the internal circuitry of the op amp. There’s no chance to change it without changing the op amp. CL is the load capacitance. If you want to drive a certain CL, you are stuck with the pole created by Ro and CL. A ……