Topic: Analog Circuits
The circuit shown in the fig. below is a: (A1 & A2 are ideal op-amps)
- A. Logarithmic Multiplier
- B. Logarithmic Amplifier
- C. Antilog Amplifier
- D. None of the above
Answer: C. Antilog Amplifier
Explanation: The first operational amplifier (A1) has a diode in its feedback loop, which typically forms a logarithmic amplifier, but here the input is applied to the non-inverting terminal. The output of A1 drives a second diode (D2) which provides an exponential (antilog) current to the second op-amp (A2). The combined configuration functions as an Antilog Amplifier for the input voltage Vs.