13.3.2 Exploring inverting and non-inverting configurations

• The ideal gain of an op-amp is infinite


  True
• The inverting amplifier configuration amplifies a signal while inverting its polarity
• A higher input resistance in an inverting amplifier leads to lower gain
• The input current in an inverting amplifier must be equal to the feedback current
• The gain equation for the inverting configuration is Av = -Rf/Rin


  True
• What is a typical value for the gain of a real op-amp?

  100,000
• Steps to calculate the voltage gain in an inverting amplifier configuration:

  1️⃣ Identify the feedback resistance (Rf)

  2️⃣ Identify the input resistance (Rin)

  3️⃣ Calculate the voltage gain using Av = -Rf/Rin
• How does increasing the input resistance affect the voltage gain in an inverting amplifier?

  Decreases gain
• Match the variable with its description in the gain equation for the inverting configuration:

  Rf ↔️ Feedback resistance

  Rin ↔️ Input resistance

  Av ↔️ Voltage gain
• In a non-inverting amplifier, higher Rf leads to greater gain.

  True
• The gain equation for the non-inverting configuration is Av = 1 + Rf / Rin
• What is the gain equation for the inverting configuration?

  Av = -Rf/Rin
• What is the gain equation for the non-inverting configuration?

  Av = 1 + Rf/Rin
• Real op-amps have a finite bandwidth and non-zero input bias current
• Steps to derive the gain equation for the inverting configuration:

  1️⃣ Apply current balance: Iin = If

  2️⃣ Use zero voltage difference: Vin - Vout/Rf = 0

  3️⃣ Rearrange the equation: Vout = -Rf/Rin * Vin

  4️⃣ Derive the gain equation: Av = -Rf/Rin
• The gain equation for the non-inverting configuration is 1 + Rf/Rin
• The gain equation for the inverting configuration is -Rf/Rin
• Which configuration has a higher input impedance, inverting or non-inverting?

  Non-inverting
• Operational amplifiers are characterized by high gain, high input impedance
• Real op-amps have limited bandwidth


  True
• A higher feedback resistance in an inverting amplifier leads to greater gain
• Steps to derive the gain equation for the inverting configuration

  1️⃣ Apply Kirchhoff's laws

  2️⃣ Set input current equal to feedback current

  3️⃣ Assume zero voltage difference between inputs

  4️⃣ Rearrange to find Vout

  5️⃣ Derive Av = -Rf/Rin
• The output voltage in an inverting amplifier is given by Vout = -Rf/Rin * VinVin
• Operational amplifiers are characterized by high gain, high input impedance, and low output impedance
• Ideal op-amps have zero input bias current.

  True
• A higher feedback resistance in an inverting amplifier increases the voltage gain
• The gain equation for the inverting configuration is derived using Kirchhoff's laws
• The voltage gain in a non-inverting amplifier is calculated using the formula Av = 1 + Rf / Rin
• What is the effect of increasing Rin on the gain of a non-inverting amplifier?

  Decreases gain
• A higher input resistance in the non-inverting configuration lowers the gain.


  True
• In the inverting configuration, the gain is determined by the ratio of Rf to Rin.

  True
• What are the three key characteristics of operational amplifiers?

  High gain, input impedance, low output impedance
• In the inverting configuration, a higher input resistance leads to a lower gain.


  True
• What does Av represent in the inverting op-amp gain equation?

  Voltage gain
• What is the final gain equation for the non-inverting configuration after applying Kirchhoff's laws?

  Av = 1 + Rf/Rin
• Match the application with the correct op-amp configuration:

  Signal Inversion ↔️ Inverting Configuration

  Signal Amplification without Inversion ↔️ Non-Inverting Configuration
• The output impedance of an ideal op-amp is zero
• The voltage gain of an inverting amplifier is given by Av = -Rf/Rin


  True
• Specific gain levels in an inverting amplifier can be achieved by adjusting Rf and Rin

  True
• The voltage difference between the op-amp's input terminals in an inverting amplifier is zero


  True