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Title : MT-058: Effects of Feedback Capacitance on VFB and CFB Op Amps
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Date : 25-Mar-2009
Downloads : 23

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It is quite common to use a capacitor in the feedback loop of a VFB op amp, to shape the frequency response as in a simple single-pole lowpass filter shown in Figure 1 below. The resulting noise gain is plotted on a Bode plot to analyze stability and phase margin. Stability of the system is determined by the net slope of the noise gain and the open-loop gain where they intersect.
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