Study Guides/Physics/Inverting vs Non Inverting Amplifier
Study Guide · Physics

Inverting and Non-Inverting Amplifiers (Op-Amps)

In Electronics, an Operational Amplifier (Op-Amp) is a highly versatile integrated circuit used to boost weak electrical signals. Depending on how you connect the input signal, an Op-Amp can be configured as an Inverting or a Non-Inverting amplifier.

Question (Click to Flip)

What is the difference between an inverting and a non-inverting amplifier?

Answer

An inverting amplifier connects the input to the negative terminal and flips the output signal by 180 degrees. A non-inverting amplifier connects the input to the positive terminal and amplifies the signal without changing its phase (0 degrees).

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Key Facts

Component: Based on Operational Amplifiers (Op-Amps).

Inverting: Flips the signal upside down (180° shift).

Non-Inverting: Amplifies the signal while keeping it upright (0° shift).

1. Inverting Amplifier

  • Connection: The input voltage signal is connected to the inverting terminal (marked with a negative '-' sign). The non-inverting terminal (+) is grounded.
  • Output Phase: The most important feature is that the output signal is inverted by 180 degrees compared to the input. If the input is positive, the amplified output will be negative.
  • Voltage Gain (Av): The formula for gain is -Rf / Rin (Feedback resistance divided by Input resistance). The minus sign indicates the phase reversal.

2. Non-Inverting Amplifier

  • Connection: The input voltage signal is connected directly to the non-inverting terminal (marked with a positive '+' sign). The inverting terminal (-) is grounded through a resistor.
  • Output Phase: The output signal is in the exact same phase (0-degree shift) as the input signal. A positive input gives a boosted positive output.
  • Voltage Gain (Av): The formula for gain is 1 + (Rf / Rin). The output is always greater than or equal to the input (Gain is never less than 1).

Summary Difference

FeatureInverting AmplifierNon-Inverting Amplifier
Input TerminalNegative (-)Positive (+)
Phase Shift180 Degrees0 Degrees (In phase)
Gain Formula-Rf/Rin1 + (Rf/Rin)

Questions and Answers

What is the difference between an inverting and a non-inverting amplifier?+

An inverting amplifier connects the input to the negative terminal and flips the output signal by 180 degrees. A non-inverting amplifier connects the input to the positive terminal and amplifies the signal without changing its phase (0 degrees).

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