Diff. pair layout for rail to rail operation

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student153

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Hi Everybody,
I am layouting a rail to rail op-amp. Obviously, at the input of OPAMP I have both NMOS and PMOS diff. pair in parallel. I want to use interdigitation technique for those diff. pair. Can any body suggest me how to layout those four input devices to make layout more symmetric.
 


To maintain symmetric, do half part and repeat remaining part... !
 

you don't need to match the pmos to nmos. Just match nmos with common-centroid or interdigitizing and likewise for just the pmoses.
 

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