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Bode Plots - Magnitude

Bode plot magnitude diagrams are only concerned with the change in slope. The value itself is irrelevant. So you continue until you reach w, and the power of the function determines your slope. (-2 would become -40, -3 becomes -60, and so forth). Then, you combine the slopes together, because multiplication of a log function can be translated to addition. The phase is calculated exactly the same way, with the only difference being that the arctan(Imaginery / real) only occurs from the decade before until the decade after your w value. So if w = 2, your line is drawn from 0.2 until 20, with the phase you calculated.