Op-Amp Basics
What does an operational amplifier (Op-amp) do?
It amplifies the difference between two input voltages
What is the ideal value of open-loop gain for an op-amp?
Infinite
What is positive feedback?
It is the process of feeding a portion of the output signal back to the non-inverting input (+) of the op-amp.
Voltage Series Feedback amplifier means?
Non-inverting amplifier with feedback.
Which Op-Amp circuit produces a ramp signal from a square wave?
Integrator
What is the schematic symbol of an op-amp?
A triangle with two input terminals and one output terminal.
What is the ideal value of output impedance in an op-amp?
Zero
What is negative feedback?
It is the process of feeding a portion of the output signal back to the inverting input (–)
In an op-amp equivalent circuit, what does Vo = A(V1–V2) represent?
Output voltage is proportional to the difference between input voltages.
What Op-Amp circuit produces a derivative of the input signal?
Differentiator
Name one common Op-Amp IC.
741 Op-Amp
What is the ideal common-mode rejection ratio (CMRR)?
Infinite
What is the effect of positive feedback on gain?
Positive feedback increases the overall gain and can lead to instability or oscillations.
What is the voltage gain formula for a non-inverting amplifier?
Av=1+(R1/Rf)
Which Op-Amp circuit adds multiple input voltages?
Summing Amplifier
µA741 operational amplifier IC was introduced by?
Fairchild Semiconductor in 1968, designed by David Fullagar.
Define Slew Rate of Op-Amp
It is the maximum rate of change of output voltage per unit time, usually expressed in V/µs.
What is the effect of Negative feedback on gain?
Negative feedback reduces overall gain but increases stability and accuracy.
Theoretically what is the typical output voltage range of a 741 Op-Amp powered with ±20V?
Approximately ±19V
What is the application of an op-amp in control systems?
Signal conditioning and feedback control.
What does the block diagram of a typical op-amp include?
Input stage, intermediate stage, level-shifting stage, and output stage.
Which characteristic allows an ideal op-amp to not draw any input current?
Infinite input impedance.
What is effect of negative feedback on bandwidth?
Increases bandwidth
What type of Op-Amp configuration is used for buffering signals?
Voltage Follower
Give an example of a non-linear application of op-amps.
Comparator or rectifier circuits.