Block 1- lecture 3

Question 1

what’s an op-amp voltage follower? Gain? input & output resistances? uses?

Answer 1

• a buffer circuit
• G=1
• high input resistance
• low output resistance
• used to reduce loading eg. on a sensor

Question 2

non-inverting amplifier?

Answer 2

• Amplifies,
• G always >1
• high input resistance
• low output resistance

Question 3

inverting amplifier?

Answer 3

• Amplifies and inverts
• high input resistance
• low output resistance

Question 4

inverting summing amplifier? How to make a weighted sum?

Answer 4

• adding multiple voltages
• different input resistors and add weights
• Remember the output is inverted

Question 5

differential amplifier?

Answer 5

subtracts voltages and amplifies the difference

Question 6

voltage to current converter?

Answer 6

varying voltage to varying current

-many different circuits possible

Question 7

current to voltage convertor?

Answer 7

varying current to varying voltage

- only has a feedback resistor

Question 8

integrator?

Answer 8

output is the integral of the input

Question 9

differentiator?

Answer 9

output is the derivative of the input

Question 10

linearization circuit?

Answer 10

placed in the feedback loop

Question 11

stabilising circuit?

Answer 11

provides fixed output while input changes

Question 12

What resistance range to use for op-amps? why?

Answer 12

K ohms, so current is in mA

Question 13

differential instrumentation amplifier?

Answer 13

differential amplifier with voltage followers on the inputs

Question 14

comparator without feedback? inverting/non-inverting

Answer 14

aka high-low circuit.

output is high when above (non-inverting) or below (inverting) ref voltage

Question 15

why feedback for a comparator?

Answer 15

input around the reference voltage may give undesirable output

Question 16

types of oscillators?

Answer 16

• astable multivibrator
• RC phase shift oscillator
• triangle wave generator