13.3.2 Exploring inverting and non-inverting configurations

• The output voltage of an Op-Amp is typically hundreds or thousands of times larger than the input voltage
• An Op-Amp has high input impedance, meaning it draws very little current from the input sources.


  True
• 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°
• An Operational Amplifier (Op-Amp) is a high-gain electronic voltage amplifier.


  True
• The output voltage of an Op-Amp is typically hundreds or thousands of times larger than the input voltage
• An Op-Amp with low output impedance can deliver a relatively large output current
• What effect does negative feedback have on the gain of an Op-Amp?

  Reduces gain
• What is the effect of negative feedback on noise in an Op-Amp?

  Reduces noise
• The voltage gain of a non-inverting Op-Amp is always positive.

  True
• The inverting Op-Amp configuration has a high input impedance.

  False
• Match the Op-Amp configuration with its common application:

  Inverting ↔️ Audio Amplification

  Non-inverting ↔️ Voltage Followers
• 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
• What phase shift does an inverting Op-Amp configuration produce?

  180°
• Negative feedback increases the stability
• The voltage gain formula for an inverting Op-Amp is $- \frac{R_{f}}{R_{i}}$, where \( R_f \) is the feedback resistance
• The input and output impedances of an Op-Amp are critical for its interaction with other circuit components.
• Which configuration is commonly used for audio amplification?

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


  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)