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# Half Subtractor using Logic Gate Simulator in Digital Electronics

Half Subtractor using Logic Gate Simulator in Digital Electronics

As the name shows that Subtractor is a logic circuit in which numbers are subtracted, but in Digital Logic and Design and Digital Electronics only binary numbers are subtracted not decimal numbers.

Subtractor has two types.

• Half Subtractor.
• Full Subtractor.

Half Subtractor:-

Half Subtractor is a logic circuit which subtracts only two bits, i.e (0 and 1). The truth table is shown below. A and B are inputs and Difference and Borrow are outputs.

• As the truth table shows that when we subtract 0 from 0 then difference and Borrow both are zeros.
• when we subtract 1 from 0 then we borrow 1, then A input becomes 0 and 1 means 2, then subtract 1 from 2 then the difference becomes 1 and borrow will also be 1.
• Meanwhile when we subtract 0 from 1 then difference will be 1 and borrow will be 0, because we had not borrowed 1.
• Lastly when we subtract 1 from 1 then difference and borrow both will be zeros.

Following is the circuit diagram of Half Subtractor.