What is the Difference Between Inverting and Non Inverting Amplifier?
🆚 Go to Comparative Table 🆚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:
Feature | Inverting Amplifier | Non-Inverting Amplifier |
---|---|---|
Output Phase | 180° out of phase with respect to input | 0° phase difference between input and output |
Input Terminals | Input signal applied at the negative terminal of the op-amp | Input signal applied at the positive terminal of the op-amp |
Gain | Gain is the ratio of the resistances | Gain is the summation of 1 and the ratio of the resistances |
Output Gain | Achieved gain is negative, providing an inverted output | Achieved gain is positive, resulting in a non-inverted output |
Input and Output | The inverting input is grounded | The non-inverting input is grounded |
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.
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