Visjnoe
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Dear Aaron,
placing a buffer with a tail current source after your amplifier (without current source) will not improve your PSRR/CMRR performance, since once the 'disturbance' is added to your nominal/ideal signal, it will proceed through the system (through your buffer etc.) so you can not get rid of it this way.
I have seen this kind of things before (e.g.omitting current sources in CML logic) and it's true, there are some benefits, but PSRR/CMRR are very important when you integrate your macro in a SoC.
Succes!
Regards
Peter
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