Cascode电流镜有没有提高电路PSRR的作用？

jianyungsun · 发表于 2014-7-19 11:40:10

回复 17# fuyibin

can you give us more details？

jianyungsun · 发表于 2014-7-19 11:43:00

回复 19# icdane

我想问一下你说的电容分压是具体是怎么回事？

fuyibin · 发表于 2014-7-19 20:36:14

回复 fuyibin
你说的对，其实我想表达，在低频的时候，一般都可以做到足够低，意义不大。所以，比如ca ...
icdane 发表于 2014-7-18 11:42

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in low power supply, it is very difficult to improve psrr. if your design is in 1V power domain, there is no enough headroom.

semico_ljj · 发表于 2014-7-20 00:05:43

testing

icdane · 发表于 2014-7-20 00:51:23

回复 23# fuyibin if really headroom limited, i do not see much difference between these two. while i would put more cap as load.

icdane · 发表于 2014-7-20 00:54:04

回复 24# semico_ljj

and assign more head room to the current source instead of adding a cascoding in the linear

fuyibin · 发表于 2014-7-20 19:53:46

回复 fuyibin if really headroom limited, i do not see much difference between these two. while i w ...
icdane 发表于 2014-7-20 00:51

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if give you 100mV headroom, you can use larger channel length or use cascode structure. one is 2 times output impedance improvement. the other is 10 times.

icdane · 发表于 2014-7-21 13:58:09

回复 27# fuyibin
i do not see that much

, anyway, this is design based, we always have options between these two

limaoze39520 · 发表于 2014-8-7 15:04:56

都在瞎扯，不说问题的本质。

银河水晶 · 发表于 2015-3-30 15:14:40

表示还是不明白

[讨论] Cascode电流镜有没有提高电路PSRR的作用？

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