GATE Electrical Engineering - Complete Master Library

 

GATE Electrical – Analog Electronics

Practice Problems – Page 13

This section contains problems based on Non-Inverting Operational Amplifier circuits.

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Problem 121

Question:

Write the voltage gain formula of a non-inverting amplifier.

Answer:

Av = 1 + (Rf / R1)

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Problem 122

Question:

If Rf = 10 kΩ and R1 = 2 kΩ, calculate voltage gain.

Solution:

Av = 1 + (Rf / R1)

Av = 1 + (10000 / 2000)

Av = 6

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Problem 123

Question:

If input voltage = 0.5 V and gain = 6, find output voltage.

Solution:

Vo = Av × Vin

Vo = 6 × 0.5 = 3 V

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Problem 124

Question:

What is the phase shift of a non-inverting amplifier?

Answer:

0°

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Problem 125

Question:

What is the input impedance of a non-inverting amplifier?

Answer:

Very high (ideally infinite).

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Problem 126

Question:

If Rf = 20 kΩ and R1 = 10 kΩ, find gain.

Solution:

Av = 1 + (Rf / R1)

Av = 1 + (20k / 10k) = 3

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Problem 127

Question:

Which op-amp configuration is used as voltage follower?

Answer:

Non-Inverting Amplifier

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Problem 128

Question:

What is the gain of a voltage follower?

Answer:

Av = 1

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Problem 129

Question:

Why is voltage follower used?

Answer:

For impedance matching between circuits.

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Problem 130

Question:

Which amplifier configuration has highest input impedance?

Answer:

Non-Inverting Amplifier