# Log and Antilog Amplifier MCQ’s

This set of Linear Integrated Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Log and Antilog Amplifier”.

1. Find the circuit that is used to compress the dynamic range of a signal?
a) b) c) d) 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. 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

4. 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

5. Find the circuit used for compensating dependency of temperature in the output voltage?
a) b) c) d) 6. Calculate the base voltage of Q2 transistor in the log-amp using two op-amps?

a) 8.7v
b) 5.3v
c) 3.3v
d) 6.2v

7. 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

8. 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) 5 Star
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