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How to Calculate Phase Margin

Electric amplifiers use phase margin to measure the difference between the phase and 180 degrees based on the frequency. A positive phase margin is required as a safety against the electric amplifier malfunctioning. In contrast, a negative phase margin is called antiphase and can produce instability. Engineers must ensure this safety for their calculations.

Instructions

    • 1

      Produce a Bode plot of the amplifier by testing the magnitude in a controlled environment. The Bode plot is a graph of magnitude over frequency of the amplifier on a log scale.

    • 2

      Find the frequency at which the amplitude of the Bode plot crosses one.

    • 3

      Convert that frequency into a number of degrees based on a phase plot.

    • 4

      Determine the distance from 180 degrees to find phase margin. So if the conversion equals 120 frequency degrees, the phase margin is (180 - 120) = 60 degrees.

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