What is NOT Logic Gate

What is logic?

In digital we define some conditions of anything in two states that are 0 and 1 for example switch conditions possibly open and close so in digital it will be 0 and 1 respectively Same as down up, left-right, off ON and false true, etc.

Due to the electronics field, we deal with current and voltages so according to the voltages we have two levels as shown in the following.

Now here we will discuss the NOT Logic.

NOT Logic Gate

NOT Gate performs the function to invert the logic. If the input is 0 then the output will be 1 and if the input is 1 then the output will be 0.

Symbol of NOT Logic Gate

Truth Table

we can understand the NOT (inverter) function by a simple electrical circuit.

 

S1 close LED will be OFF

S1 open LED will be ON

RTL of NOT Gate 

Resistor Transistor Logic (based circuit)

by using the switching mode of the transistor to understand the

working of RTL NOT gate.

working of RTL NOT gate.

Input 0: Q1 will be in off condition and current flow toward output through R1 means output 1.

Input 1: Q1 will be ON and current flow through Q1 and R1 and ground. Max voltage drop across R1. (VCE = VCC – ICRC) and the output will be 0.

CMOS (basic circuit is) NOT gate 

CMOS is Complementary to MOS which means in this logic NMOS and PMOS twice are used. CMOS basic circuit is NOT gate.

If input A=0:

When input A=0 then PMOS will be ON and NMOS will be OFF and the current flows through output so output logic = 1.

If input A=1:

When input A = 1 then PMOS will be OFF and NMOS will be off Now current flow through PMOS and output so the output is 0.