Question

Slew rate of an ideal op-amp is

• A. \( \text{Infinite} \)
• B. \( \text{Very high} \)
• C. \( \text{Low} \)
• D. \( \text{Zero} \)

Hint:

Remember the key ideal characteristics of an op-amp, as they often appear in questions about ideal components. The concept of "infinite" or "zero" for these parameters helps simplify analysis and highlights the theoretical upper limits of performance. Specifically, for slew rate, "infinite" means the output can change infinitely fast, which is a key assumption for the op-amp to instantaneously respond to input changes without distortion, especially for high-frequency or large-amplitude signals.

Answer 1

The Correct Option is A

To solve this problem, we need to understand the concept of the slew rate in operational amplifiers (op-amps) and determine the value for an ideal op-amp.

1. Understanding Slew Rate:

- Slew Rate: The slew rate of an op-amp is defined as the maximum rate of change of its output voltage per unit of time, usually expressed in volts per microsecond (V/μs). It measures how quickly the op-amp can respond to rapid changes in the input signal.

- For an ideal op-amp, the slew rate is considered to be infinite. This means that an ideal op-amp can instantly change its output in response to any changes in the input signal, without any limitation on the speed of the response.

2. Analyzing the Options:

- Option 1: "Infinite" – This is correct. The slew rate of an ideal op-amp is considered infinite, as it can change its output voltage instantaneously in response to changes in the input.

- Option 2: "Very high" – This is a characteristic of real-world op-amps, but not an ideal one. In an ideal op-amp, the slew rate is infinite.

- Option 3: "Low" – This is incorrect for an ideal op-amp. A low slew rate would be characteristic of a non-ideal or real op-amp.

- Option 4: "Zero" – This is incorrect, as it would imply the op-amp cannot change its output at all, which is not true for an ideal op-amp.

Final Answer:

The slew rate of an ideal op-amp is Infinite.