common centroid diff pair layout

[arunkumar446]

common centroid layout examples

can any one help me, how common centroid diff pair layout is done and wt are it's advantages. reference to some papers is appreciated, Thanks in advance.

 

[erikl]

common centroid

can any one help me, how common centroid diff pair layout is done and wt are it's advantages.

Better matching, better symmetry. S. common-centroid.pdf below. This would provide the best matching for 2 equal transistors.

reference to some papers is appreciated, Thanks in advance.

Here you may find some examples of common centroid layout.

 

[deepak242003]

layout common centroid

moreover it reduces the offset effect

 

[erikl]

layout of common centroid diff

moreover it reduces the offset effect

Not at all. Just the difference between offset voltages.

 

[deepak242003]

commom centroid

yes thats what i meant......

 

[kumarans]

Hai Guys,
I have one dout
which below mentioed pattern is good and avoid the gradient and offset voltage??????????

ABAB ABBA
BABA VS BAAB
ABAB BAAB
BABA ABBA

Rgds
Kumaran.S

 

[egg]

Hai Guys,
I have one dout
which below mentioed pattern is good and avoid the gradient and offset voltage??????????

ABAB ABBA
BABA VS BAAB
ABAB BAAB
BABA ABBA

Rgds
Kumaran.S

Hi Kumaran, I think the common-centriod would be better, for example, usually the ABBA would be better then ABAB.

Besides, I have another question, for the amp pair:
ABBA
BAAB
the route all in the middle channel or around the device, which one would be better?