In this video, the Comparator circuit and its different configurations like inverting comparator, Non-Inverting Comparator, and window comparator have been explained.
What is Comparator:
A comparator is a device which compares the two analog inputs and gives the digital output depending upon which input is higher.
The comparator has two analog inputs (Inverting and Non-inverting Input) and it has one digital output (In some IC's complementary outputs are also available)
Inverting Comparator:
If the input signal is applied to the inverting terminal of the comparator then it is known as the inverting comparator. Because in this configuration, the output will be low when the input is greater than the reference voltage at the other terminal.
Non-Inverting Comparator:
If the input signal is applied to the Non-inverting terminal of the comparator then it is known as the Non-inverting comparator. Because in this configuration, the output will be High when the input is greater than the reference voltage at the other terminal.
Window Comparator:
In some applications, when it is required to have a high or low output when the input is within a specific band (of voltages) then window comparator is used. And it can be designed by combining the inverting and non-inverting comparators.
Op-Amp vs Comparator:
Schematically, Op-amp and comparators look identical. In fact, in their internal structure also they are almost identical except the final stage. Op-amps are designed to use for linear applications while comparators are designed to use specifically for operating it in the saturation region.
In open loop configuration, op-amp can be used as a comparator, but in general, the response of the op-amp will not be as fast as a comparator. (Because of Slew Rate)
Comparators are compatible with different logic families like TTL, RTL (Because of open collector output), and output of the comparator can be used as input to the logic gates. While in case of op-amp as a comparator, it is required to limit the output using the external circuit.
Application of Comparator:
Comparators are used as waveform converter, zero crossing detector, analog to digital converters (ADC), and in the applications where two input levels need to be compared.
Timestamps for the different topics covered in the video:
0:18 Introduction to Comparator
1:32 Op-Amp vs Comparator
4:41 Inverting and Non-Inverting Comparator
7:12 Window Comparator
10:15 Limitation of Comparator
This video will be helpful to all student of science and engineering in understanding the comparator circuit and its different configuration.
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