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The total output noise for a single-pole system was analyzed in Tutorial MT-049. The circuit shown in Figure 1 below represents a second-order system, where capacitor C1 represents the source capacitance, stray capacitance on the inverting input, the input capacitance of the op amp, or any combination of these. C1 causes a breakpoint in the noise gain, and C2 is the capacitor that must be added to obtain stability.
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