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Ultimate Operational Amplifier Knowledge Quiz

Test Your Amplifier Circuit Analysis Skills Now

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art displaying question and answer bubbles for Operational Amplifier Knowledge Quiz

Welcome to the Operational Amplifier Knowledge Quiz, your gateway to mastering op-amp fundamentals. This interactive quiz presents 15 multiple-choice questions on circuit analysis, feedback theory, and amplifier design. It's perfect for electronics students and professionals aiming to reinforce their skills and boost confidence. Each question can be easily edited in our intuitive editor, giving you full control of your learning journey. For additional practice, try the Knowledge Assessment Quiz or dive into the IT Knowledge Trivia Quiz, and don't forget to explore all our quizzes.

What is the input impedance of an ideal operational amplifier?
Negative
High but finite
Zero
Infinite
In an ideal op amp, the input impedance is infinite to prevent any current from flowing into the input terminals. This ensures there is no loading effect on the signal source.
What is the output impedance of an ideal operational amplifier?
High but finite
Zero
Equal to the input impedance
Infinite
An ideal op amp has zero output impedance so that it can drive any load without voltage drop at its output. This characteristic provides maximum voltage transfer to the load.
What is the closed-loop gain of an inverting amplifier with feedback resistor Rf = 10 kΩ and input resistor Rin = 2 kΩ?
0.2
5
-5
-0.2
The gain of an inverting amplifier is -Rf/Rin. With Rf = 10 kΩ and Rin = 2 kΩ, the gain is -10k/2k = -5.
The closed-loop voltage gain of a non-inverting amplifier is given by:
Rf/(R1 + Rf)
R1/(Rf + R1)
1 + (Rf/R1)
Rf/R1
For a non-inverting amplifier the gain formula is 1 plus the ratio of the feedback resistor to the resistor to ground: 1 + (Rf/R1).
The common-mode rejection ratio (CMRR) of an op amp is the ratio of:
Differential gain to common-mode gain
Difference between differential and common-mode gain
Common-mode gain to differential gain
Differential gain times common-mode gain
CMRR is defined as the ratio of the amplifier's differential gain to its common-mode gain. A high CMRR means better rejection of unwanted common-mode signals.
How does applying negative feedback to an op amp typically affect its bandwidth?
Has no effect
Makes bandwidth infinite
Increases bandwidth
Reduces bandwidth
Negative feedback reduces the closed-loop gain but extends the amplifier's bandwidth. The gain-bandwidth product of the device remains approximately constant.
For an op amp with a gain-bandwidth product of 1 MHz, what maximum closed-loop gain can you achieve if you need a bandwidth of 10 kHz?
0.01
1000
10
100
The gain-bandwidth product is constant, so the maximum closed-loop gain = GBW / required bandwidth = 1 MHz / 10 kHz = 100.
Which factor primarily limits the maximum slew rate of an op amp?
Input offset voltage
Internal compensation capacitor charging current limit
Feedback resistor value
Common-mode input range
Slew rate is limited by the maximum current available to charge or discharge the internal compensation capacitor. This current determines how fast the output can change.
What is the effect of decreasing phase margin below 45° in a feedback amplifier?
No change in behavior
Better transient response
Improved stability
Increased overshoot and potential oscillation
A phase margin below about 45° leads to significant overshoot and can make the amplifier prone to ringing or oscillation when step inputs are applied.
What is the primary purpose of the Miller compensation capacitor in an op amp?
To adjust input bias current
To reduce input noise
To create a dominant pole for stability
To increase slew rate
The Miller compensation capacitor creates a low-frequency dominant pole in the open-loop response, improving phase margin and ensuring stable closed-loop operation.
In a summing inverting amplifier with Rf = 10 kΩ and two input resistors each 10 kΩ, what is the output voltage if the inputs are 1 V and 2 V?
-3 V
-2 V
-1 V
3 V
Output is Vout = -Rf*(V1/R1 + V2/R2) = -10k*(1/10k + 2/10k) = -(1+2) = -3 V. The negative sign indicates phase inversion.
In an ideal op amp integrator with R = 10 kΩ and C = 0.1 μF, what is the magnitude of its transfer function at 1 kHz?
0.159
0.00628
6.283
10
The magnitude of an integrator is |H(jω)| = 1/(R·C·ω). Substituting R=10k, C=0.1μF, ω=2π·1kHz gives approximately 0.159.
Which configuration is best for using an op amp as a buffer to isolate a source from a load without gain change?
Summing amplifier
Voltage follower
Differential amplifier
Inverting amplifier
The voltage follower (unity-gain buffer) provides very high input impedance and very low output impedance, isolating source and load without changing signal amplitude.
For a first-order active low-pass filter using R = 16 kΩ and C = 10 nF, what is its cutoff frequency fc?
100 Hz
16 kHz
1.6 kHz
995 Hz
Cutoff frequency fc = 1/(2πRC). Substituting R=16 kΩ and C=10 nF gives about 995 Hz.
If an inverting amplifier has input offset voltage Vio, the resulting output offset voltage is:
-(1 + Rf/Rin)·Vio
Vio·Rin/Rf
Vio/(1 + Rf/Rin)
Zero
The offset is amplified by the closed-loop gain. For an inverting amplifier gain = -Rf/Rin, the offset at the output is Vout_offset = (closed-loop gain)·Vio = -(1 + Rf/Rin)·Vio.
An op amp has unity-gain frequency of 5 MHz and two poles at 100 kHz and 3 MHz. What is the approximate phase margin?
32°
58°
148°
90°
Phase lag = arctan(5 MHz/100 kHz) + arctan(5 MHz/3 MHz) ≈ 89° + 59° = 148°. Phase margin = 180° - 148° ≈ 32°.
If the internal compensation capacitor is 10 pF and the charging current is 5 μA, what is the slew rate of the op amp?
50 V/μs
0.5 V/μs
0.05 V/μs
5 V/μs
Slew rate SR = I/C. With I = 5 μA and C = 10 pF, SR = 5×10❻❶ A / 10×10❻¹² F = 0.5×10❶ V/s = 0.5 V/μs.
A summing amplifier outputs non-integer weighted sums for integer inputs. Which is the most likely cause?
Insufficient bandwidth
Mismatched input resistor values
High input bias current
Excessive input offset voltage
If the resistor ratios are not precise, the intended weights change and produce unexpected output values. Accurate resistor matching is critical for correct summing operation.
An instrumentation amplifier uses two 10 kΩ resistors and a gain resistor RG = 5 kΩ. What is its gain?
21
11
3
5
Instrumentation amplifier gain = 1 + (2·R1/RG) = 1 + (2·10 kΩ / 5 kΩ) = 1 + 4 = 5.
In a multiple-feedback band-pass filter with R1 = 10 kΩ, R2 = 20 kΩ, C1 = C2 = 10 nF, what is the center frequency f0?
1590 Hz
159 Hz
1125 Hz
1000 Hz
Center frequency f0 = 1/[2π√(R1·R2·C1·C2)] = 1/[2π√(10k·20k·10nF·10nF)] ≈ 1125 Hz.
0
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Learning Outcomes

  1. Identify ideal op-amp parameters and specs
  2. Analyze inverting, non-inverting, and differential configurations
  3. Evaluate frequency response and stability criteria
  4. Apply feedback techniques for gain control
  5. Demonstrate troubleshooting skills in op-amp circuits
  6. Master practical applications like filters and amplifiers

Cheat Sheet

  1. Ideal Op-Amp Characteristics - Imagine an amplifier with boundless power: infinite open-loop gain, input impedance so high it never loads your signal, and perfect silence from zero output impedance and zero offset voltage. Embracing these ideal traits turns complex analysis into a piece of cake and lets you focus on creative circuit design. The Ideal Op-Amp (Operational Amplifier) | Ultimate Electronics Book
  2. Inverting Amplifier Configuration - Get ready to flip signals upside down as the inverting amplifier takes your input and gives you an output that's 180° out of phase with the original. By tweaking the ratio of the feedback resistor to the input resistor, you can dial in any voltage gain you need for your project. Inverting Operational Amplifier | Electronics Tutorials
  3. Non-Inverting Amplifier Configuration - Keep your signal in sync! The non-inverting amplifier gives you an output in phase with your input and boosts its amplitude by 1 plus the ratio of the feedback resistor to the input resistor. It's perfect when you want a clean, amplified version of your source without any phase juggling. Non-inverting Operational Amplifier | Electronics Tutorials
  4. Differential Amplifier Setup - Love teamwork? The differential amplifier only amplifies the difference between two inputs, ignoring any common-mode noise that both signals share. This makes it invaluable for precise measurements and noisy environments where rejection of unwanted interference is key. Differential Amplifier | Electronics Tutorials
  5. Frequency Response & GBWP - Explore how op-amps trade off gain for bandwidth via the gain-bandwidth product (GBWP): the higher the gain you set, the narrower the frequency your amp can handle. Mastering this balance ensures your signals stay clear and distortion-free across the desired spectrum. Operational Amplifier Bandwidth | Electronics Tutorials
  6. Op-Amp Stability & Phase Margin - Nobody likes a wobbly amplifier! Ensuring a phase margin greater than 45° keeps your op-amp stable and oscillation-free. Learn how compensating networks and careful design choices can give you rock-solid performance. Operational Amplifier Stability | Electronics Tutorials
  7. Negative Feedback Techniques - Unlock the secret sauce of modern electronics by mastering negative feedback: it tames gain, stretches bandwidth, trims distortion, and boosts linearity. Discover how feeding a portion of the output back to the input makes your circuits behave like disciplined, well-mannered amplifiers. Negative Feedback in Operational Amplifiers | Electronics Tutorials
  8. Troubleshooting Common Issues - Become a circuit detective by diagnosing offset voltage drifts, pesky bias currents, and sluggish slew rate limitations. Understanding these quirks equips you to fine-tune real-world op-amp designs and banish unexpected behaviors. Operational Amplifier Parameters | Electronics Tutorials
  9. Active Filter Applications - Dive into delicious signal seasoning with op-amp - based filters: whip up smooth low-pass soups, crisp high-pass crisps, or savory band-pass blends. These tasty circuits are staples in audio, communications, and data processing. Active Filters | Electronics Tutorials
  10. Versatile Op-Amp Applications - From trusty voltage followers (buffers) to summing mixers and integral calculators, op-amps are the Swiss Army knives of analog design. Explore how each configuration can simplify complex tasks and spark innovation in your next project. Operational Amplifier Applications | Electronics Tutorials
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