Question: What is the primary characteristic of a log amplifier using an op-amp?

Options:

1. It produces a linear output for linear input
2. It outputs a logarithmic function of the input voltage
3. It filters out high-frequency signals
4. It provides gain for low-level signals

Correct Answer: It outputs a logarithmic function of the input voltage

Solution:

A log amplifier outputs a logarithmic function of the input voltage, which is useful in applications requiring exponential scaling.