Exam-style question
Try this first
What are two common limitations of real operational amplifiers compared to ideal op‑amps, and how do these limitations affect circuit performance?.
Model answer
What a good answer should say
- Real op‑amps have a finite open‑loop gain and a limited bandwidth, so the closed‑loop gain is constrained by the gain‑bandwidth product and the feedback network.
- They also have a limited output current and a finite supply voltage, which can cause the output to saturate when the required voltage exceeds the supply rails.
- These limitations mean that real op‑amps cannot provide infinite gain or drive heavy loads without distortion.
Explanation
Why this works
This question tests the student’s ability to identify and explain key practical limitations of real op‑amps, such as finite gain, bandwidth, output current, and supply voltage limits, and to relate these to circuit performance.
Common mistake
No common mistake is linked to this question yet.