Roll No: 190630107132
• What is 4 Bit Arithmetic Circuit?
1. Arithmetic circuits can perform seven different arithmetic
operations using a single composite circuit.
2. It uses a full adder (FA) to perform these operations. A
multiplexer (MUX) is used to provide different inputs to the
circuit in order to obtain different arithmetic operations as
outputs.
3. Consider the following 4-bit Arithmetic circuit with inputs A and
B. It can perform seven different arithmetic operations by varying
the inputs of the multiplexer and the carry (C0).
• Components:
1. 4 units of Full Adders.
2. 4 units of 4X1 Multiplexers.
3. 5 units of NOT Gates.
1. Full Adders: -
Full Adder is the adder which adds three inputs and produces two
outputs. A full adder logic is designed in such a manner that can take
eight inputs together to create a byte-wide adder and cascade the
carry bit from one adder to the another.
2. NOT Gate: -
A NOT gate (also often called Inverter) is a logic gate. Each NOT gate
has only one input signal. Logically with NOT gates, the input and the
output swap, so if you input 1 its outputs as 0; likewise, if you input 0
it outputs as 1.
4 Bit Arithmetic Unit
