1. Which of the following functions does the antilog computation required to perform continuously with log-amps?

A. In(x)

B. log(x)

C. Sinh(x)

D. All of the mentioned

2. Find the output voltage of the log-amplifier

A. V_{O} = -(kT)×ln(V_{i}/V_{ref})

B. V_{O} = -(kT/q)×ln(V_{i}/V_{ref})

C. V_{O} = -(kT/q)×ln(V_{ref}/V_{i})

D. V_{O} = (kT/q)×ln(V_{i}/V_{ref})

3. How to provide saturation current and temperature compensation in log-amp?

A. Applying reference voltage alone to two different log-amps

B. Applying input and reference voltage to same log-amps

C. Applying input and reference voltage to separate log-amps

D. None of the mentioned

4. The input voltage, 6v, and reference voltage, 4 v are applied to a log-amp with saturation current and temperature compensation. Find the output voltage of the log-amp?

A. 6.314(kT/q)v

B. 0.597(kT/q)v

C. 0.405(kT/q)v

D. 1.214(kT/q)v

5. Determine the output voltage for the given circuit

A. V_{O} = V_{ref}/(10^{-k’vi})

B. V_{O} = V_{ref}+(10^{-k’vi})

C. V_{O} = V_{ref}×(10^{-k’vi})

D. V_{O} = V_{ref}-(10^{-k’vi})

6. Calculate the base voltage of the Q_{2} transistor in the log-amp using two op-amps?

A. 8.7v

B. 5.3v

C. 3.3v

D. 6.2v

7. Determine output voltage of analog multiplier provided with two input signals V_{x} and V_{y}.

A. V_{o} = (V_{x} ×V_{x}) / V_{y}

B. V_{o} = (V_{x} ×V_{y} / V_{ref}

C. V_{o} = (V_{y} ×V_{y}) / V_{x}

D. V_{o} = (V_{x} ×V_{y}) / V_{ref}^{2}

8. Match the List-I with list-II

List-I | List-II |

1. One quadrant multiplier | i. Input 1- Positive, Input 2- Either positive or negative |

2. Two quadrant multiplier | ii. Input 1- Positive, Input 2 – Positive |

3. Four quadrant multiplier | iii. Input 1- Either positive or negative, Input 2- Either positive or negative |

A. 1-ii, 2-i, 3-iii

B. 1-ii, 2-ii, 3-ii

C. 1-iii, 2-I, 3-ii

D. 1-I, 2-iii, 3-i

9. What is the disadvantage of the log-antilog multiplier?

A. Provides four-quadrant multiplication only

B. Provides one quadrant multiplication only

C. Provides two and four-quadrant multiplication only

D. Provides one, two, and four-quadrant multiplication only

10. An input of Vsinωt is applied to an ideal frequency doubler. Compute its output voltage?

A. V_{o} = [(V_{x}×V_{y}) /V_{ref}^{2}] × [1-cos2ωt/2].

B. V_{o} = [(V_{x}^{2}×V_{y}^{2}) /V_{ref}] × [1-cos2ωt/2].

C. V_{o} = [(V_{x}×V_{y})^{2} /V_{ref}] × [1-cos2ωt/2].

D. V_{o} = [(V_{x}×V_{y}) /( V_{ref}] × [1-cos2ωt/2].