Similarly a Flip-Flop can be built by using a combination of Logic Gates and the Logic Gates itself can be built by using a few Transistors. Logic Gates are the basics of a many digital electronic circuit. From the basic Flip-Flops to Microcontrollers Logic gates form the underlying principle on how bits are stored and processed. They state the relation between every input and output of a system using an Arthmetic logic. There are many different types of logic gates and each of them has a different logic which be used for different purposes. But the focus of this article will be on the AND Gate because later we would be building an AND Gate using a BJT transistor circuit. AND Logic GateĪND logic gate is a D-shaped logic gate with two inputs and one single output, where the D shape in between the input and output is the logic circuit. The relation between input and output values can be explained using the AND Gate Truth Table shown below. The equations output can be easily explained using the AND Gate Boolean Equation, which is Q = A x B or Q = AB.

Hence, for an AND Gate the output is HIGH only when both the inputs are HIGH. TransistorĪ transistor is a semiconductor device with three terminals that can be connected to an external circuit. The device can be used as a switch and also as an amplifier to change the values or control the passing of an electrical signal.įor building an AND logic gate using a transistor we would be using BJT transistors which can be further classified into two types: PNP and NPN – Bipolar Junction Transistors. The circuit symbol for each of them can be seen below.

This article will explain to you, how to build AND Gate circuit using transistor.

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