# Where are subtractor used?

Last Update: April 20, 2022

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**Asked by: Johnnie Wunsch**

Score: 4.8/5 (66 votes)

It is an electronic device or logic circuit which performs subtraction of two binary digits. It is a combinational logic circuit used **in digital electronics**. Many combinational circuits are available in integrated circuit technology namely adders, encoders, decoders, and multiplexers.

## Where is full subtractor used?

The full subtractor is used to **subtract three 1-bit numbers A, B, and C, which are minuend, subtrahend, and borrow**, respectively. The full subtractor has three input states and two output states i.e., diff and borrow.

## What is the job of subtractor?

subtractor An **electronic logic circuit for calculating the difference between two binary numbers, the minuend and the number to be subtracted, the subtrahend** (see table). A full subtractor performs this calculation with three inputs: minuend bit, subtrahend bit, and borrow bit.

## What is the use of adder and subtractor?

Adder and subtractor are basically used for **performing arithmetical functions like addition, subtraction, multiplication and division in electronic calculators and digital instruments**. They are also used in microcontrollers for arithmetic additions, PC (program counter) and timers.

## How the full subtractor can be implemented using?

Explanation: A full subtractor has 3 input bits and two outputs bits BORROW and DIFFERENCE. The full subtractor can be implemented using **two half subtractors and an OR gate**.

## Half Subtractor

**25 related questions found**

### How does a full subtractor work?

A full subtractor is a **combinational circuit that performs subtraction of two bits**, one is minuend and other is subtrahend, taking into account borrow of the previous adjacent lower minuend bit. ... The three inputs A, B and Bin, denote the minuend, subtrahend, and previous borrow, respectively.

### Why it is called Half subtractor?

Quite similar to the half adder, a half subtractor subtracts two 1-bit binary numbers to give two outputs, difference and borrow. **Since it neglects any borrow inputs and essentially performs half the function of a subtractor**, it is known as the half subtractor.

### Can a full adder subtractor?

It is also possible to design a **4 bit parallel subtractor** using 4 full adders as shown in the below figure. This circuit performs the subtraction operation by considering the principle that the addition of minuend and the complement of the subtrahend is equivalent to the subtraction process.

### How does adder subtractor work?

In Digital Circuits, A Binary Adder-Subtractor is one which is capable of both **addition and subtraction of binary numbers** in one circuit itself. The operation being performed depends upon the binary value the control signal holds.

### What is full subtractor?

The full subtractor is **a combinational circuit which is used to perform subtraction of three input bits**: the minuend , subtrahend , and borrow in . The full subtractor generates two output bits: the difference and borrow out .

### What are the types of subtractor?

**There are two types of subtractors.**

- Half Subtractor.
- Full Subtractor.

### What is difference between half and full subtractor?

The difference output of first half subtractor is **Ex-OR of A and B**. The difference output of full subtractor is Ex-OR of B_{in} and output of first half subtractor. Similarly, the borrow output of first half subtractor is ORed with the borrow output of second half subtractor to get the borrow output of full subtractor.

### What is the truth table of Half subtractor?

Half Subtractor is a combinational logic circuit. It is used for the **purpose of subtracting two single bit numbers**. It contains 2 inputs and 2 outputs (difference and borrow).

### How does half subtractor work?

The half subtractor is also a building block **for subtracting two binary numbers**. It has two inputs and two outputs. This circuit is used to subtract two single bit binary numbers A and B. The 'diff' and 'borrow' are two output states of the half subtractor.

### Why a full adder is called so?

A full adder circuit is central to most digital circuits that perform addition or subtraction. It is so called because **it adds together two binary digits, plus a carry-in digit to produce a sum and carry-out digit**. It therefore has three inputs and two outputs.

### What is full adder and subtractor explain?

A combinational logic circuit that performs the addition of two single bits is called Half Adder. A combinational logic circuit **that performs the addition of three single bits** is called Full Adder.

### How do you make a full adder?

Full Adder is the adder which **adds three inputs and produces two outputs**. The first two inputs are A and B and the third input is an input carry as C-IN. The output carry is designated as C-OUT and the normal output is designated as S which is SUM.

### What is BCD subtractor?

A subtractor circuit is **required to perform a subtraction operation on two decimal numbers**. BCD subtraction is slightly different from BCD addition. ... For instance, the 9's complement of BCD 0111 is calculated by complementing every bit to get 1000. The value 0010 is obtained by adding binary 1010 and ignoring the carry.

### What is 4bit adder?

The ′**F283** is a full adder that performs the addition of two 4-bit binary words. The sum (Σ) outputs are provided for each bit and the resultant carry (C4) output is obtained from the fourth bit. The device features full internal look-ahead across all four bits generating the carry term C4 in typically 5.7 ns.

### What is a 3 bit adder?

The operation of this 3 bit adder, the EX-OR between **3 bits sum** will be generated and any two bits out of three will be logic 1 the carry will be generated. Here, it will be implemented by using 2 half adders. The half adder has an addition of 2 bits. By using this half adder we implement an 3 bit adder.

### What is the use of half subtractor?

Half Subtractor is a combinational logic circuit. It is used for the **purpose of subtracting two single bit numbers**. It contains 2 inputs and 2 outputs (difference and borrow).

### How many gates are required for half subtractor?

Total **5 NAND gates** are required to implement half subtractor.

### Which gates are used in half subtractor?

The circuit of the half subtractor can be built with two logic gates **namely NAND and EX-OR gates**. This circuit gives two elements such as the difference as well as they borrow.