Quaternary logic(radix-4)

It will have 4 states .Those are 0V,0.4V,0.8V,1.2V for simplicity we can consider as 0V,1V,2V,3V
To drive these four states we will have three power supplies.We can implement Quaternary logic in two ways.
    i.e.  1) Through NMOS Logic
          2) Through CMOS Logic