How to increase CMRR of a telescopic opamp?

[sarveshks2003]

Hi
I want to know how to increase CMRR of a telescopic opamp .

 

[castrader]

opamp

pay attention to the tail current source!
Its rds is the most important!

 

[Hunter_BJUT]

opamp

layout matching.

 

[yyliang]

Re: opamp

make your input differential pair with big w/l, pay attention to the match of the current mirror, and you also need to reduce the system offset.

 

[venky442]

Re: opamp

CMRR can be increased by maintaining the higher differential gain than c ommon mode gain.
for that mismatech between mosfets should be avoided

 

[ameed]

Re: opamp

hi all,

To increase CMRR

make your input differential pair with big w/l, pay attention to the match of the

current mirror, and you also need to reduce the system offset.

thanx.....[/quote]