This category includes circuits which perform some arithmetic operation (addition, subtraction, negation, etc.) Table of contents Half Adder 1-bit Full Adder 2-bit Full Adder 4-bit Ripple Carry Adder 4-bit Carry Lookahead Adder 8-bit Ripple Carry Adder Schematics Half Adder Schematic 1-bit Full Adder Schematic 2-bit Full Adder Schematic 4-bit Ripple Carry Adder Schematic 4-bit Carry Lookahead Adder Schematic 8-bit Full Adder (ripple carry) Schematic