Operational Amplifier Fundamentals Quiz Quiz

Test your foundational knowledge of operational amplifiers (op-amps) with these easy questions about inverting and non-inverting configurations, gain-bandwidth product, slew rate, and basic stability concepts. Sharpen your understanding of key op-amp principles for electronics learners.

1. Basic Inverting Amplifier

   In an inverting op-amp configuration, what is the typical phase relationship between the input and output signals?

   1. The output is 180 degrees out of phase with the input
   2. The output lags the input by 90 degrees
   3. The output has the same phase as the input
   4. The output leads the input by 90 degrees

2. Non-Inverting Gain Formula

   What is the voltage gain formula for a basic non-inverting op-amp configuration with resistors R1 from ground to inverting input and R2 from output to inverting input?

   1. R2 - R1
   2. R2/R1
   3. R1 + R2
   4. 1 + (R2/R1)

3. Role of Negative Feedback

   Why is negative feedback commonly used in operational amplifier circuits?

   1. It decreases the bandwidth drastically
   2. It stabilizes the gain and improves linearity
   3. It increases the input impedance only
   4. It makes the output louder

4. Gain-Bandwidth Product

   If an op-amp has a gain-bandwidth product of 1 MHz, what is the highest closed-loop gain possible at 10 kHz?

   1. 10
   2. 100
   3. 1,000
   4. 0.01

5. Input Impedance

   For a standard non-inverting op-amp circuit, what is a key characteristic regarding its input impedance?

   1. The input impedance is always 1 kΩ
   2. The input impedance is very low
   3. The input impedance equals the feedback resistor
   4. The input impedance is very high

6. Slew Rate Definition

   What does the slew rate of an operational amplifier specify?

   1. The minimum supply voltage required
   2. The minimum offset voltage
   3. The maximum current supplied to the load
   4. The maximum rate of change of the output voltage per unit time

7. Typical Slew Rate Limitation

   What effect does a low slew rate have on an op-amp's performance when amplifying a fast, large-amplitude signal?

   1. The bandwidth becomes infinite
   2. The gain increases significantly
   3. The input signal gets attenuated
   4. The output waveform will become distorted

8. Unity-Gain Buffer Application

   Which op-amp configuration provides a voltage gain of 1 and is used for impedance buffering?

   1. Voltage follower (unity-gain buffer)
   2. Inverting amplifier
   3. Differentiator
   4. Summing amplifier

9. Feedback and Stability

   Which type of feedback in an op-amp circuit is essential for stable operation in amplifier applications?

   1. Oscillating feedback
   2. Zero feedback
   3. Negative feedback
   4. Positive feedback

10. Input vs Output Signal in Inverting Op-Amp

    If you apply a positive step voltage to the input of an inverting op-amp circuit, what happens to the output?

    1. The output remains at zero
    2. The output oscillates randomly
    3. The output increases positively
    4. The output jumps negative by the amplified amount