Adders and subtractors in vlsi design
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The document describes designing and simulating half adder, full adder, half subtractor, and full subtractor circuits using logic gates in Cadence NC-SIM. A half adder adds two bits and produces a sum and carry output. A full adder adds three bits and produces a sum and carry output. A half subtractor subtracts one bit from another and produces a difference bit and borrow bit, while a full subtractor subtracts bits considering borrow from the next column and produces difference and borrow bits. The circuits are simulated and truth tables are verified. These circuits can be used to add and subtract binary numbers.
Adders and subtractors in vlsi design
- 1. Aim: To design and construct half adder, full adder, half subtractor and full subtractor circuits and verify the truth table using logic gates. Tools: Cadence NC-SIM THEORY: The half adder circuit adds two binary digits & produces a sum (Σ) & a carry output (Co). The full adder adds the bits A & B &Carry (Ci). It generates a sum (Σ) and a Carry output (CO). A half Subtractor is an arithmetic circuit that subtracts one bit from another bit, producing a difference bit (D) and borrow bit (Bo). It is an arithmetic circuit that subtracts one bit fromanother bit taking into consideration the borrow (Bo) from the column. It produces a difference bit (D) and a borrow bit (Bo) required for the next higher column.
- 4. A=1;B=0;C=0; Application’s: Adding binary numbers Name: N.Pavan Section: E1305 Roll No. : 30