请问电路中极点与零点的产生与影响

comewsz

谢谢，还在了解中！！

comewsz

谢谢分享！！

zzuwy

看这个帖子学到不少

ddiva

零极点。。。 看看

ylliang66

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zhpdlut

零点的产生有多种，主要就是由于通过电容（如Cgd,Cc)形成了一个前馈通路，从而使得信号在两个通路上传播，这可能导致在输出点两路信号互相抵消。这就形成了零点。零点分为左半平面零点和右半平面零点。左半平面零点会使系统幅度响应产生+20db/dec的增量斜率。对相位则产生90的增量。   右半平面零点的影响则相反。
       极点一般是因为在信号通路中存在节点，而连接节点的有电阻还有电容，这就会形成极点。一个节点对应一个极点（差分通路中具有对称位置的两个节点只产生一个极点）。只有当系统的极点都在左半平面时系统才是稳定的。左半平面极点会使系统幅度响应产生-20db/10dec斜率。对相位则产生-90的增量。
       电路震荡是因为电路有复数极点。

wayne_me

都毕业一年多了，当年信号系统也没怎么学好。零极点问题在电路中是很难看出来的，应该通过信号分析，得出传输函数，然后由此判断吧

wayne_me

1. a zero means there is a null effect for the signal going through. While a pole means there is a boosting effect for teh signal going through.
2. Pole and Zero actually is not always Pole or Zero because they can be exchanged depending on feedback and also depending on which point you are looking from(e.g. zero at open loop and will be pole at close loop )
3. So please do not confused by them. Also treat the circuit as a  path which signal goes in or comes out. Actually, Pole and Zero concept is just a mathematical point of view. The true meaning is how signal responds when its frequecny approaches them.

Classical explanation from "prof3"     Some times those English books explain questions in a quite simple way, that's why professors suggest buying them.

crystalzhn

xieji5200

观望学习， 现在呆在电路这一块呢