np-CMOS or NORA, CMOS 28T Mirror Adder, Ripple Carry Adder, Carry Look-Ahead Adder, 8 Bit Full Adder, 16 Bit Full Adder, Manchester Carry Chain, Carry Bypass or Carry Skip Adder,Carry Ripple versus Carry Bypass, Linear Carry-Select Adder, Linear Carry-Select Adder, Adder Delays - Comparison, Carry Increment Adder , Carry Save Adder, Serial Adder,4 Bit-Adder Subtractor, BCD Adder.