电源设计：如何利用波特图来满足动态控制行为的要求 | Analog Devices
1. The second important information shown in the figure is the area below the gain curve, which is the function integral. The higher the DC gain and AC crossover frequency, the better the control loop can maintain a constant output voltage.
--->Can the DC gain be indicated in the diagram?
2. In the example shown, the crossover frequency is 80 kHz. So, the phase margin in Figure 3 is about 60 °. A phase margin below about 40 ° is considered unstable. When the phase margin is between 40 ° and 70 °, the control loop is set well. Within this range, it is possible to balance both speed regulation and stability effectively. When the phase margin is higher than 70 °, the system is very stable, but the adjustment speed is very slow.
--->How are the two parameters of phase margin at 40 ° and 70 ° derived? Also, is there a problem with a phase margin of about 60?
