Operational Amplifiers Flashcards
Is a type of differential amplifier with high gain
Operational Amplifier
In what configuration is the op-amp a comparator?
Open-Loop Configuration
In what configuration can an op-amp make circuit performance stabilized and far more predictable?
Closed-Loop Configuration
What pin is not present in an op-amp?
Ground Pin
Identifies the op-amp sensitivity to variations in the power supply.
Power-Supply Rejection Ratio (PSRR)
For a 40dB and 60dB PSRR value, how much change is there in the output voltage when there is a 1V change in the power supply?
0.01V; 0.001V
(for every 20dB rise, tenfold increase in the ratio)
It is the current needed to power the op-amp
Supply Current or Quiescent Current
Indicates how much load the op-amp places on the input source
Input Resistance (Rin)
Typical Rin values for op-amps
hundreds of mega ohms
It is the current needed to drive the inputs and can yield input resistance via Ohm’s Law and the supply voltage
Input Bias Current (Ib)
What value should the input offset voltage (Vos) and input offset current (Ios) be close to?
0
What is the output when the input offset voltage (Vos) and input offset current (Ios) are both 0?
0
Is the voltage or current applied to the input to force the output to exactly 0
Offset Error
Are offset errors problematic for AC, DC or both?
DC
It spells out limits to the input voltage that can be applied to the op-amp
Common-Mode Voltage Range (CMVR)
It refers to an error in the balancing of the inputs
Common-Mode Rejection Ratio (CMRR)
How much input error can there be in the balance between inputs if the CMRR is 60dB?
0.1%
It indicates the maximum amplification possible without any feedback in op amps
Op-Amp Large Signal Voltage Gain (Av or Avo)
It defines the op-amp max current output
Output Short-Circuit Current (Isc)
It measures how fast the output can change in op amps.
Slew Rate
What is the gain at the point at which the op-amp can’t keep up with the signal and the input and output are the same voltage
Unity
What is the highest operating frequency of the amplifier?
Bandwidth
