common-mode feedback的问题

angelweishan · 发表于 2010-6-18 01:46:10

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本帖最后由 angelweishan 于 2010-6-18 11:44 编辑

common-mode feedback的问题

我是否可以用一个two-stage cmos OP (gain >60db)做为differential-input and differential output op amp的
cm sense amplifier？Please explain it. Thanks you in advance.

Paul Gray page 824 Figure 12.16

sdmout · 发表于 2010-6-18 12:50:40

Generally speaking it's fine. But the cmfb loop stability could be a very tricky issue. Very likely such a cmfb would oscillating.

A simple diff pair, or diode connected diff pair is enough for the cmfb loop.

地势坤 · 发表于 2010-6-19 12:23:13

看看看

CDWAN · 发表于 2010-6-20 11:11:07

DDDDDDDDDDDD

tiankuang25 · 发表于 2010-6-20 17:40:46

貌似是共模反馈通路需要较高的带宽吧，你采用两级运放的话带宽达不到的

jiangyanjin · 发表于 2010-6-22 09:52:02

带宽不够吧

sdmout · 发表于 2010-6-24 08:29:19

See your other post in the "Analog/RF IC 设计讨论". Some people have provided good understandings.

Just try a differential pair with diode connected load. It shall work.

kpluxiao · 发表于 2010-7-5 11:52:26

学习了

aceafee · 发表于 2010-7-28 10:54:53

进来学习一下

鋒鋒 · 发表于 2010-8-10 21:31:14

thanks

[求助] common-mode feedback的问题

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