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The value of gain used to be in the range Now, this operational amplifier is a very high gain amplifier. Where here this A represents the open-loop gain of this operational amplifier. So, now here suppose if we apply the input signal between these two positive and the negative terminals then at the output we will get A times this differential input signal. Because the output will be get inverted with respect to the input. And that is why this input terminal is knownĪs the inverting terminal. That means the output will be get inverted by 180 degrees. So, suppose let’s say if we are applying the sinusoidal signal at the input then at the output we will get the amplified sinusoidal signal which is having a 180-degree phase with respect to the input signal. Likewise, whenever we are applying input to this negative terminal, and we are grounding another terminal then the output of this amplifier will be equal to minus A times the V2 because the difference between these two input terminals will be equal to 0 minus V2, that is equal to minus V2. Now, here the phase of this output voltage will be the same as the input voltage. So, suppose if you are applying the sinusoidal signal over here, then at the output that sinusoidal signal should be get multipliedīy the factor of this gain and at the output, you should get the amplified sinusoidal signal.

When there is no feedback from the output to the input side. Where A is the open loop gain of this operational Amplifier. If we have applied the single input to this operational amplifier and we have grounded another input terminal then at the output you will get A times V1. So, let’s say V1 and V2 are the input signals which is being applied to this operational amplifier and let’s say the gain of this operational amplifier is A, then the output will be equal: It means that this amplifier amplifies the difference between the two input signals. So, now if you see this operational amplifier, it is one kind of differential amplifier with the singal output. So, now in this operational amplifier, the input terminal which is marked by this positive sign is known as the non-inverting input terminal and another input terminal which is marked by this negative sign is the known as the inverting input terminal. But there are many op-amp IC’s which runs on the single power supply. The positive and the negative power supply. Most of the operational amplifiers consist of two power supplies. It consists of two inputs and one output.