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The open-loop frequency response of a voltage feedback op amp is shown in Figure 1 below. There are two possibilities: Fig. 1A shows the most common, where a high dc gain drops at 6 dB/octave from quite a low frequency down to unity gain. This is a classic single pole response. By contrast, the amplifier in Fig. 1B has two poles in its response—gain drops at 6 dB/octave for a while, and then drops at 12 dB/octave.
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