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A capaciTIve load, like that presented by some A/D converters,can someTImes be a challenge for an op amp to drive dependingon the architecture of the op amp. Most of the problem is causedby the pole created by the output impedance of the op amp andthe capacitor that is driven. This creates extra phase shift thatcan eventually cause the op amp to become unstable.One way to prevent instability and improve settling TIme whendriving a capacitor is to insert a resistor in series between theop amp output and the capacitor. The feedback resistor is sTIllconnected directly to the output of the op amp, while the seriesresistor provides some
