Phase margin (PM), also known as phase margin, is a very important indicator in circuit design. It is mainly used to measure the stability of negative feedback systems and can be used to predict the overshoot of the closed-loop system step response. .
The phase margin can be seen as the phase change that can be increased before the system enters the unstable state. The larger the phase margin is, the more stable the system is, but the time response speed is slowed down, so a proper phase margin must be obtained.
First, define the frequency point where the gain amplitude is equal to 1 as the "gain crossover point", and set the frequency point w1; the frequency point where the gain phase is equal to -180° is the "phase crossover point". It is the frequency point W2.
The phase margin is defined as the difference between the phase of the op amp gain and the phase of the -180° at the gain intersection frequency. The expression is
PM=∠Av(W1)-(-180°)= ∠Av(W1) +180°
W1 in the equation is the gain crossover frequency of the operational amplifier.
It has been found that the phase margin is at least 45°, preferably 60°.
The phase margin can be seen as the phase change that can be increased before the system enters the unstable state. The larger the phase margin is, the more stable the system is, but the time response speed is slowed down, so a proper phase margin must be obtained.
First, define the frequency point where the gain amplitude is equal to 1 as the "gain crossover point", and set the frequency point w1; the frequency point where the gain phase is equal to -180° is the "phase crossover point". It is the frequency point W2.
The phase margin is defined as the difference between the phase of the op amp gain and the phase of the -180° at the gain intersection frequency. The expression is
PM=∠Av(W1)-(-180°)= ∠Av(W1) +180°
W1 in the equation is the gain crossover frequency of the operational amplifier.
It has been found that the phase margin is at least 45°, preferably 60°.
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