我发这个求助帖的初衷是因为我在做STB仿真时就发现Loop Gain Phase往上翘的现象，但是这个频率是高于环路的单位增益带宽的，我就和同事讨论了一下这种现象会不会造成环路不稳定，大家没有形成共识。
我看了一些资料，上面说到如果右半平面零点频率很高，可以不考虑它对相位裕度的影响（我之前也是倾向这种观点）。
Hi，您好！最近在琢磨这个多环路的断点问题，有论坛里面提到：
the analysis of multi-loop feedback systems can be simplified to a single loop case if any of this two conditions is met:
1) All the feedback loops have a break point in common. In this case, by breaking the loops at that point the stability analysis is performed as if it were a single loop case.
2) A multi-loop feedback which comprises one general feedback network and several inner (local) feedback loops can be analyzed by just breaking the general feedback network (single loop) if each of its inner feedback networks is stable by itself (which must be left intact during the analisys).
Hi，您好！最近在琢磨这个多环路的断点问题，有论坛里面提到： the analysis of multi-loop feedback systems can be simplified to a single loop case if any of this two conditions is met: 1) All the feedback loops have a break point in common. In this case, by breaking the loops at that point the stability analysis is performed as if it were a single loop case. 2) A multi-loop feedback which comprises one general feedback network and several inner (local) feedback loops can be analyzed by just breaking the general feedback network (single loop) if each of its inner feedback networks is stable by itself (which must be left intact during the analisys). 按照这种说法，这个断环点可以应该在EA输出端，这样可以把两个环都断开。 可是，正如您所说，在EA输出点断开，频率补偿电容的值对极点分离貌似不明显，可能破坏了密勒补偿，我也挺赞成这种说法的（参见 http://www.eda365.com/thread-172186-1-1.html 这篇文章貌似也不赞成在破坏频率补偿环路的地方断环）。
