Non investing mode of operational amplifier as a comparator

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The output voltage has two states binary and works as a 1-bit analog-digital converter. Its use is very important in the applications of signal generation, detection, signal modulation, etc. The second image below shows the symbol to represent comparators that is the same as that used for operational amplifiers.

The comparator accepts analog signals at the input and provides binary signals at the output. This element constitutes a link between the analog and digital world. Outside that range the amplifier output stage goes into saturation and can work as a comparator.

Image below shows a simple application of the Op Amp as a comparator. This section discusses about these two types in detail. Inverting Comparator An inverting comparator is an op-amp based comparator for which a reference voltage is applied to its non-inverting terminal and the input voltage is applied to its inverting terminal. This comparator is called as inverting comparator because the input voltage, which has to be compared is applied to the inverting terminal of op-amp.

The circuit diagram of an inverting comparator is shown in the following figure. The operation of an inverting comparator is very simple. Example Let us draw the output wave form of an inverting comparator, when a sinusoidal input signal and a reference voltage of zero volts are applied to its inverting and non-inverting terminals respectively.

Similarly, during the negative half cycle of the sinusoidal input signal, the voltage present at the inverting terminal of the op-amp is less than zero volts. The following figure shows the input and output waveforms of an inverting comparator, when the reference voltage is zero volts. In other words, output changes its value when the input is crossing zero volts. Hence, the above circuit is also called as inverting zero crossing detector.

Non-Inverting Comparator A non-inverting comparator is an op-amp based comparator for which a reference voltage is applied to its inverting terminal and the input voltage is applied to its non-inverting terminal.

This op-amp based comparator is called as non-inverting comparator because the input voltage, which has to be compared is applied to the non-inverting terminal of the op-amp.

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