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Thank you for the suggestion. I was wandering if there are any topologies that could be used for this purpose, something like a super source follower sort of. I tried connected a diode connected pmos between supply and output of the invertor and having a fixed current source between supply and gate/drain of this pmos to define its bias current  - since a diode connected devcie has output impedance of ~1/gm, i am expecting the overall output impedance of the invertor to come down but that did not improve things much..trying to do something on these lines..