what’s an op-amp voltage follower? Gain? input & output resistances? uses?
- a buffer circuit
- G=1
- high input resistance
- low output resistance
- used to reduce loading eg. on a sensor
non-inverting amplifier?
- Amplifies,
- G always >1
- high input resistance
- low output resistance
inverting amplifier?
- Amplifies and inverts
- high input resistance
- low output resistance
inverting summing amplifier? How to make a weighted sum?
- adding multiple voltages
- different input resistors and add weights
- Remember the output is inverted
differential amplifier?
subtracts voltages and amplifies the difference
voltage to current converter?
varying voltage to varying current
-many different circuits possible
current to voltage convertor?
varying current to varying voltage
- only has a feedback resistor
integrator?
output is the integral of the input
differentiator?
output is the derivative of the input
linearization circuit?
placed in the feedback loop
stabilising circuit?
provides fixed output while input changes
What resistance range to use for op-amps? why?
K ohms, so current is in mA
differential instrumentation amplifier?
differential amplifier with voltage followers on the inputs
comparator without feedback? inverting/non-inverting
aka high-low circuit.
output is high when above (non-inverting) or below (inverting) ref voltage
why feedback for a comparator?
input around the reference voltage may give undesirable output
types of oscillators?
- astable multivibrator
- RC phase shift oscillator
- triangle wave generator
