HW5
Build a Carry-Lookahead Adder
Tasks:
Task 1. Derive
the
logic
function of the carry-lookahead adder. (20 points)
Task 2. Build a Ripple Carry Full Adder and a Carry Lookahead Full Adder in LTSPICE (NOT ElectricVLSI). (20 points).
Task 2. Run simulations for
both
adders, use the two inputs: A2A1A0=111,
B2B1B0=00x, keep toggling B0 during the simulation. Plot C2C1C0 and
S2S1S0 in the same
plot and compare those two results. Explain why the CLA is faster. (60
points)
A closer look of the
schematic: