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Any good references on Rail to Rail Input/Output amplifier with 1.5V Vdd

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I need some references for rail to rail inout output amplifier to be used as a buffer for a driving Capacitive DAC.

min 60dB, closed loop BW (unity gain) - 1MHz, Vdd - 1.5V.

i am working on 0.18um with 1.5V vdd and cant stack more than 4 transistors which makes most of the class AB type difficult to design.
 

I will try this as input stage... any thing for output rail to rail stage ?
 


Don't forget that when using this simple rail to rail input Nmos, PMOs pairs you will not have a constant GM which will change your GBW over input range. This could effect your system which you should check! I would also suggest the Monticelli or battery bias class AB output as well... They are very simple to build and work very very well!
Jgk
 

A fast buffer. Drawback: input is low impedance.
US patent: US7463066
 

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