What is the Difference Between Inverting and Non Inverting Amplifier?

The main difference between an inverting and a non-inverting amplifier lies in the phase relationship between the input and output signals. Here are the key differences between the two types of amplifiers:

Inverting Amplifier:

• Introduces a phase shift of 180° between the input and output signals.
• The output signal is inversed and amplified relative to the input signal.
• The input signal is applied at its inverting (negative) terminal.
• The non-inverting terminal is grounded.
• Its voltage gain is given by Av = -(Rf/Rin).
• Its voltage gain is negative.
• Its input impedance is Rin.

Non-Inverting Amplifier:

• Has no phase shift (0° phase shift) between the input and output signals.
• The output signal is amplified but not inverted relative to the input signal.
• The input is applied at its non-inverting terminal.
• The inverting terminal is grounded through a resistor.
• Its voltage gain is given by Av = 1 + Rf / R.
• Its voltage gain is positive.
• Its input impedance is very high, typically in the megaohm range.

Both inverting and non-inverting amplifiers use negative feedback, which increases the accuracy of the amplification process. Inverting amplifiers are commonly used in audio and instrumentation circuits, while non-inverting amplifiers are commonly used in voltage follower circuits and audio and instrumentation circuits where the signal needs to be amplified without being inverted.

Comparative Table: Inverting vs Non Inverting Amplifier

Here is a table comparing the differences between inverting and non-inverting amplifiers:

In summary, the main differences between inverting and non-inverting amplifiers are the output phase, input terminals, gain, and the gain applied to the input signal. Inverting amplifiers provide an amplified signal that is 180° out of phase with the input, while non-inverting amplifiers maintain the same phase as the input signal. The gain of an inverting amplifier is determined by the ratio of the resistances, whereas the gain of a non-inverting amplifier is the summation of 1 and the ratio of the resistances.