2.4 - Analogue electronics

Question 1

What can an op-amp be used for?

Answer 1

Increase the voltage of a signal

Question 2

State 2 characteristics of an ideal op amp

Answer 2

• Input current should be virtually zero, so the op amp has almost infinite input resistance, having very little effect on the circuit producing the input signal
• There should be no potential difference between the inverting and non inverting inputs, so that both input pins are at the same potential

Question 3

What are 2 restrictions of an op amps output voltage

Answer 3

• An op amps output voltage cannot be greater than the positive power supply voltage
• An op amps output voltage cannot be less than the negative power supply voltage

Question 4

What does an op amp connected in inverting mode do?

Answer 4

It will invert the input signal

Question 5

What does an op amp connected in differential mode do?

Answer 5

It will amplify the potential difference between its two inputs