3.2.4. Input and Output Impedance

Try these first

1. 1.

   What is the ideal input impedance for an operational amplifier?

   Hint

   Think about the source circuit's integrity.

2. 2.

   Why is low output impedance desirable in op-amps?

   Hint

   Consider how it affects the relationship with the load.

3. 3.

   What is the primary reason for high input impedance in op-amps?

   • To amplify the signal
   • To minimize loading of the source
   • To increase distortion

   Hint

   Consider the effect on the source circuit.

4. 4.

   True or False: A low output impedance is needed to prevent significant voltage drop when driving loads.

   • True
   • False

   Hint

   Think about why this is relevant in operational amplifier design.

5. 5.

   Design a signal conditioning circuit that incorporates principles of both input and output impedance. Explain how you would choose the components.

   Hint

   Think about how each component influences the impedance characteristics.

6. 6.

   Suppose an op-amp has a stated input impedance of 10 kΩ and the source has an output impedance of 1 kΩ. Calculate the voltage drop across the source when connected to the op-amp.

   Hint

   Use the voltage divider formula.