2. A one-bit full adder with carry in/out has three inputs and two outputs. Inputs: A: First coefficient. B: Second coefficient. CIN: Carry input from previous stage. Outputs S: Sum. COUT: Carry output. a. Determine the logic functions for S and Co in terms of A, B, and CI. Remember, for CMOS design you can only use ANDS, ORs, and NOTs in your logic functions. b. Implement each logic function in CMOS. c. Determine how many PMOS and NMOS transistors are required. d. Using kn=kp=20mA/V2, Vtn=|Vtpl=0.8V, and VDD=2.5V, determine rDSN, SDP. note: If you need to use an inverter to a satisfy the function syntax for the PUN or PDN, just use the inverter symbol in part b and assume (1 PMOS and 1 NMOS) per inverter in part c.

Fig: 1