CMRR in a r2r input stage

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filipecbv

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What is the best choice in rail-to-rail input stages, concerning the CMRR in all the range of operation????
Because in the transition region, the CMRR are degraded a lot using complementary differential pairs.
What could be a good topology to overcome this problem?
Thanks a lot!
Filipe
 

using a kind differential pair to perform r2r input range, and using charge pump to boost the corresponding power supply voltage, this may be a solution.
 

and without charge pump, what is a good solution???
 

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