By the inverter, the gate terminal of the p-channel MOSFETs is now at a negative supply voltage potential. When the control input is a logic one, the gate terminal of the n-channel MOSFETs is located at a positive supply voltage potential. Accordingly, neither of the two transistors will conduct and the transmission gate turns off. Regardless of on which switching terminal of the transmission gate (A or B) a voltage is applied (within the permissible range), the gate-source voltage of the n-channel MOSFETs is always negative, and the p-channel MOSFETs is always positive. The gate terminal of the p-channel MOSFET is caused by the inverter, to the positive supply voltage potential. When the control input is a logic zero (negative power supply potential), the gate of the n-channel MOSFET is also at a negative supply voltage potential. VTHN and VTHP denote those positions at which the voltage to be switched has reached a potential, where the threshold voltage of the respective transistor is reached. If A, B, C, D,….Resistance characteristic of a transmission gate. An OR gate can have an infinite number of inputs and gives only one output. OR gate is a classical logical gate that gives the output as the Boolean sum of the inputs of the gate. Here, I’m going to discuss the Boolean equation, logical diagram and operation of each of these logic gates. OR and AND gates follow multi-input logic whereas the NOT gate performs single-input logic. OR gate, AND gate, NOT gate are the three basic classical logic gates. Basic Logic gates with Truth Tables and diagrams Check the Diode as a switch and Transistor as a switch.

The construction elements (Diode or Transistor) of logic gates are designed to be operated as switches. Sometimes it gives the complement of the sum or multiplication of the inputs at its output. Even a logic gate can give the complement of input at the output. If a logic gate has more than one input, it allows passing the desired binary bit at the output of the logic gate. Logic gates perform classical switching operations.

Here these are not the parts of our discussion. There are some quantum logic gates that are very much different from these. Here we are dealing with classical logic gates. All the logic gates are made of resistors and diodes or transistors. The operation is basically switching operations. Logic gates are physical electronic devices that can perform logical operations with one or more binary inputs and give a single binary digit at the output.

Uses of Logic gates What are Logic Gates?.NAND gate, NOR gate, XOR gate and XNOR gate are discussed in other articles. Only these three gates are discussed here. OR gate, AND gate and NOT gate are the three basic logic gates among those. There are seven logic gates for digital computers. This will be helpful for the students of Physics, Electronics and Computer Science. In this article, we’re going to explore basic logic gates with truth tables, circuit diagrams, Boolean expressions, operations and uses. Digital electronic devices contain integrated circuits (ICs) which are made of logical gates. These gates have significant roles in the construction of logical circuits for different computations. Logic gates are the basic building blocks of digital electronics that follow different logical operations.

Transistor gate tables