13.3.2 Exploring inverting and non-inverting configurations

• What is an Operational Amplifier (Op-Amp)?

  A high-gain voltage amplifier
• What type of input does an Op-Amp have?

  Differential
• An Op-Amp has low output impedance
• Order the effects of negative feedback on Op-Amp characteristics:

  1️⃣ Reduces gain

  2️⃣ Increases stability

  3️⃣ Reduces noise
• What type of feedback is used in both inverting and non-inverting configurations?

  Negative
• In an inverting configuration, the input signal is applied to the inverting terminal.
• What does Ri represent in the voltage gain formulas?

  Input resistance
• What effect does positive feedback have on noise in Op-Amps?

  Increases noise
• What is the voltage gain formula for an inverting configuration?

  -\frac{R_f}{R_i}</latex>
• In an inverting configuration, the input impedance is low.
• Inverting configurations are commonly used in audio amplification.
• What type of input does an Op-Amp have?

  Differential input
• What does a differential input in an Op-Amp amplify?

  Voltage difference
• An Op-Amp has two inputs and one output.


  True
• An Op-Amp has high input impedance, meaning it draws very little current from the input sources.


  True
• In the inverting configuration, the output signal is inverted
• What is the effect of negative feedback on the gain of an Op-Amp?

  Reduces it
• Match the Op-Amp configuration with its voltage gain formula:

  Inverting configuration ↔️ -Rf/Ri

  Non-inverting configuration ↔️ 1 + (Rf/Ri)
• In a non-inverting configuration, the output signal is not inverted.

  True
• Match the feedback type with its effect on stability:

  Negative Feedback ↔️ Increases stability

  Positive Feedback ↔️ Decreases stability
• Negative feedback is used in both inverting and non-inverting configurations to improve stability.

  True
• What is the voltage gain formula for a non-inverting configuration?

  $1 +$$\frac{R_{f}}{R_{i}}$
• The output impedance of a non-inverting Op-Amp is low, close to 0 Ω.


  True
• What are non-inverting configurations often used for?

  Voltage followers
• Match the Op-Amp configuration with its characteristics:

  Inverting ↔️ 180° phase shift

  Non-inverting ↔️ No phase shift
• An Op-Amp with high input impedance draws very little current from the input sources.


  True
• The non-inverting Op-Amp configuration has no phase shift.


  True
• Positive feedback in an Op-Amp increases stability.

  False
• What is the voltage gain of an inverting Op-Amp if \( R_f = 10k\Omega \) and \( R_i = 1k\Omega \)?

  -10
• What is the typical input impedance of an inverting Op-Amp?

  Low
• Non-inverting Op-Amps are used in voltage followers to buffer signals
• The output voltage of an Op-Amp is typically hundreds or thousands of times larger than the input voltage
• What happens to the input signal in the non-inverting configuration?

  It is not inverted
• Positive feedback in Op-Amps increases gain
• In the voltage gain formula for an Op-Amp, Rf represents the feedback resistance
• What does Rf represent in the voltage gain formulas?

  Feedback resistance
• Negative feedback in Op-Amps reduces the overall gain of the circuit.
• The voltage gain of an Op-Amp determines how much it amplifies the input signal.
• Calculate the voltage gain for an inverting configuration with Rf = 10kΩ and Ri = 1kΩ.

  1️⃣ $- \frac{10k\Omega}{1k\Omega}$

  2️⃣ $- 10$
• Match the Op-Amp configuration with its phase shift:

  Inverting ↔️ 180°

  Non-inverting ↔️ 0°