4-bit binary adder or ripple carry adder's Inputs A and B each have 4 bits, the sum of the calculation results is S3, S2, S1, S0, and the rounding number is C3. Answer about 4 bit binary adder

1. Block diagram in notes using Full adder

2. Design a schematic

3. Fill in the ORANGE Blank

B S BT C; Co [ 4-9] A 1 B 1 C 1