• 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 dynamic ranges. • Log amps: Basics and building blocks To set the stage, a logarithmic amplifier is an electronic circuit that produces an output voltage proportional to the logarithm of its input signal, whether voltage or current. • By using the exponential electrical behavior of semiconductor junctions-typically diodes or bipolar junction transistors-log amps offer an elegant way to compress signals that span a wide dynamic range, such as those from photodiodes, radio frequency detectors, or audio sensors, into a more manageable scale. • Coming to log amp architecture, these specialized circuits produce an output voltage proportional to the logarithm of the input signal amplitude. • There are three fundamental architectures commonly employed to realize log amps: the basic diode log amp, the successive detection log amp, and the true log amp, which is implemented using cascaded semi-limiting amplifiers. • In the simplest form, the diode log amp exploits the exponential current-voltage relationship of a silicon diode.

Article Summaries:

  • 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 dynamic ranges. Log amps: Basics and building blocks To set the stage, a logarithmic amplifier is an electronic circuit that produces an output voltage proportional to the logarithm of its input signal, whether voltage or current. By using the exponential electrical behavior of semiconductor junctions-typically diodes or bipolar junction transistors-log amps offer an elegant way to compress signal

Sources: