GATE Electrical – Analog Electronics
Practice Problems – Page 10
This section includes practice problems based on Operational Amplifier fundamentals and ideal characteristics.
Problem 91
Question:
Define an operational amplifier.
Answer:
An operational amplifier is a high-gain differential amplifier used to perform mathematical operations such as addition, subtraction, integration, and differentiation.
Problem 92
Question:
What are the ideal characteristics of an op-amp?
Answer:
- Infinite open loop gain
- Infinite input impedance
- Zero output impedance
- Infinite bandwidth
- Infinite CMRR
- Infinite slew rate
Problem 93
Question:
What is the typical open loop gain of an op-amp?
Answer:
≈ 100,000 (10⁵)
Problem 94
Question:
Define input offset voltage.
Answer:
Input offset voltage is the small differential voltage required between input terminals to make output zero.
Problem 95
Question:
What is slew rate?
Answer:
Slew rate is the maximum rate of change of output voltage.
Slew Rate = dV/dt
Problem 96
Question:
What is the ideal input current of an op-amp?
Answer:
Zero
Problem 97
Question:
Why is input impedance of op-amp very high?
Answer:
To ensure negligible current flows into the input terminals.
Problem 98
Question:
What is the ideal output impedance of an op-amp?
Answer:
Zero
Problem 99
Question:
What is the function of feedback in op-amp circuits?
Answer:
Feedback stabilizes gain and improves amplifier performance.
Problem 100
Question:
Name two basic op-amp configurations.
Answer:
- Inverting amplifier
- Non-inverting amplifier
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