Inverting Amplifier

Inverting Amplifier

As the name suggests the output of such the input signal. The inverted output signal compared to the input signal. So, an amplifier which provides a phase is called inverting amplifier.

So, an amplifier which provides a phase is called inverting amplifier.

Inverting Amplifier

The basic circuit diagram of an inverting amplifier using op-amp is shown in the Fig. 2.17 (a).
Let us derive the expression for its closed loop gain which is Vo / Vi„

As node B is grounded, node A is also at ground potential, from the concept of virtual ground, so VA = 0

Inverting Amplifier

Now from the output side, considering the direction of current I we can write,

Inverting Amplifier

Entire current I passes through R f as op-amp input current is zero.

Equating (1) and (2) we get,

Inverting Amplifier

The Rf/R1 is the gain of the amplifier while negative sign indicates that the RI polarity of output is opposite to that of input. Hence it is called inverting amplifier. The input and output waveforms are shown in the Fig. 2.17 (b).

Inverting Amplifier

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