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. VO = -(kT)×ln(Vi/Vref)
B. VO = -(kT/q)×ln(Vi/Vref)
C. VO = -(kT/q)×ln(Vref/Vi)
D. VO = (kT/q)×ln(Vi/Vref)
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. VO = Vref/(10-k’vi)
B. VO = Vref+(10-k’vi)
C. VO = Vref×(10-k’vi)
D. VO = Vref-(10-k’vi)
6. Calculate the base voltage of the Q2 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 Vx and Vy.
A. Vo = (Vx ×Vx) / Vy
B. Vo = (Vx ×Vy / Vref
C. Vo = (Vy ×Vy) / Vx
D. Vo = (Vx ×Vy) / Vref2
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. Vo = [(Vx×Vy) /Vref2] × [1-cos2ωt/2].
B. Vo = [(Vx2×Vy2) /Vref] × [1-cos2ωt/2].
C. Vo = [(Vx×Vy)2 /Vref] × [1-cos2ωt/2].
D. Vo = [(Vx×Vy) /( Vref] × [1-cos2ωt/2].