In this post, we will take a gentle dive into logarithmic amplifiers—commonly known as log amps—those quietly powerful circuits that work behind the scenes to decode exponential signals and tame wide ...

Download this article in PDF format. Logarithmic amplifiers with their log functionality are useful for compressing wide dynamic-range signals whereby the measured quantities are in decibels (dB).

The basic anti-log amplifier looks like the familiar circuit of Figure 1. The approximate equation for V 0 given in Figure 1 comes from the Ebers-Moll model. A more advanced model employed by many ...