5. Op-Amp Applications

Try these first

1. 1.

   Define an inverting amplifier.

   Hint

   Think about the phase relationship.

2. 2.

   What is the formula for the gain of a non-inverting amplifier?

   Hint

   Consider how the resistors affect the gain.

3. 3.

   What is the gain of an inverting amplifier when R_f is 10kΩ and R_{in} is 1kΩ?

   • 10
   • -10
   • 1

   Hint

   Remember the formula for inverting gain.

4. 4.

   Is a non-inverting amplifier output in phase with its input? (True/False)

   • True
   • False

   Hint

   Think about the operational characteristics of non-inverting amplifiers.

5. 5.

   Calculate the output voltage of an inverting amplifier with R_f = 20kΩ and R_{in} = 2kΩ when the input voltage is 3V.

   Hint

   Remember to first find the gain using the resistors.

6. 6.

   Design a circuit with a non-inverting amplifier with a gain of 5. If R_1 = 1kΩ, what should R_f be?

   Hint

   Use the gain formula to find R_f once you know A_v.