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QUESTION: 1

What is the minimum number of terminals required in an IC package containing four operational amplifiers (quad op amps)?

Solution:

The minimum no of pins required by dual-op-amp is 8. Each op-amp has 2 input terminals(4 pins) and one output terminal(2 pins). Another 2 pins are required for power.

Similarly, The minimum no of pins required by dual-op-amp is 14: 4*2 + 4*1 + 2 = 14.

QUESTION: 2

Which of the following is not a property of an ideal operational amplifier?

Solution:

An ideal operational amplifier does not has a zero input impedance.

QUESTION: 3

In an ideal op amp the open-loop gain is 10^{3}. The op amp is used in a feedback circuit, and the voltages appearing at two of its three signal terminals are measured as v_{2} = 0V and v_{3} = 2V where it is assumed that v_{1} and v_{2} are input terminals and v_{3} is the output terminal. The value of the differential (v_{d}) and common-mode (v_{cm})signal is

Solution:

V_{c} = 0.5(V_{1} + V_{2}) and

V_{d = V2 – V1.}

QUESTION: 4

Consider the figure given below. Known that vo = 4V and vi = 2V, determine the gain for the op amp assuming that it is ideal except for the fact that it has finite gain

Solution:

The Voltage at the positive input has to be -3.000v, v_{i} = -3.020v

A = v_{o} / v_{i} – v_{r} = -2 / -3.020 -(-3) = 100.

QUESTION: 5

Which of the following is not a terminal for the operational amplifier?

Solution:

There are three terminals for the operational amplifier.

QUESTION: 6

Operational amplifiers are

Solution:

It is another way to refer to op amps based on its terminal characteristics.

QUESTION: 7

Express the input voltages v_{1} and v_{2} in terms of differential input (v_{d}) and common-mode input(v_{c}). Given v_{2} > v_{2}.

Solution:

This is the correct mathematical representation.

QUESTION: 8

What is the minimum number of pins for a dual operational amplifier IC package?

Solution:

The minimum no of pins required by dual-op-amp is 8. Each op-amp has 2 input terminals(4 pins) and one output terminal(2 pins). Another 2 pins are required for power.

QUESTION: 9

For an ideal operational amplifier (except for the fact that it has finite gain) one set of the value for the input voltages (v_{2} is the positive terminal v_{1} is the negative terminal) and output voltage (v_{0}) as determined experimentally is v_{1}= 2.01V, v_{2}=2.00V and v_{0}= -0.99V. Experiment was carried with different values of input and output voltages. Which of the following is not possible considering experimental error?

Solution:

Only option d does not satisfies the mathematical relation between the given quantities.

QUESTION: 10

What are the units of slew rate?

Solution:

These units are obtained from the definition of the term slew rate.

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