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This slide is from op amp bandwidth video number 1. It illustrates the equations for a pole and its associated magnitude and phase response on Bode plots. A pole causes a negative 20 dB/decade decrease in the slope of the magnitude response after the pole frequency, fp. The pole also causes a negative 90 degree phase shift in the phase response beginning roughly a decade before fp and ending roughly a decade afterwards. At fp the magnitude response will have decreased by negative 3 dB, and the phase will have shifted by negative 45 degrees. While the pole results in a total phase shift of 90 degrees over about 2.5 decades, the phase shift is equal to negative 5.7 degrees a decade before fp and negative 84.3 degrees a decade after fp.
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This slide, also from op-amp bandwidth video 1, illustrates the equations for a zero and its associated magnitude and phase response on Bode plots. A zero causes a positive 20dB/decade increase in the slope of the magnitude response after the zero frequency, fz. The zero also causes a positive 90 degree phase shift in the phase response beginning roughly a decade before fz and ending roughly a decade afterwards. At fz the magnitude response has increased by plus 3 dB and the phase has shifted by positive 45 degrees. While the zero results in a total phase shift of positive 90 degrees over about 2.5 decades, the phase shift is equal to positive 5.7 degrees a decade before fz and positive 84.3 degrees a decade after fz.
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