Why the gain of first stage is greater than second one for two-stage op?

angelweishan · 发表于 2010-7-7 16:49:16

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Why the gain of first stage is greater than second one for two-stage CMOS op amps?

Please explain it for me.
Thanks you in advance.

kuohsi · 发表于 2010-7-7 17:18:41

noise比較低

duling653 · 发表于 2010-7-7 17:41:58

第二级可以用来提供较大的摆幅，不用cascode结构，所以增益比第一级低；
第一级增益大的话方便进行频率补偿，将主极点放在第一级的输出节点处；
有利于减小第二级的mismatch和noise

wind2000sp3 · 发表于 2010-7-7 18:31:08

no such mandatory requirments. Although it could reduce noise and psrr, it will make frequency compensation complicated. Trade-off considerations should be performed based on a specified envirement.

baiyawen · 发表于 2011-6-11 22:06:32

学习了

hsh22 · 发表于 2011-6-11 22:41:23

同学习。。。

guang3000 · 发表于 2011-6-12 07:51:37

表示不理解

[求助] Why the gain of first stage is greater than second one for two-stage op?

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