Keywords: Op-Amp Logarithmic Amplifier.svg A circuit diagram of a logarithmic amplifier made using an operational amplifier <math>v_\mathrm out -V_ \gamma \ln \left \frac v_\mathrm in I_\mathrm S \cdot R \right </math> where <math>I_\mathrm S </math> is the saturation current own 2009-01-26 Inductiveload Own work all rights released Public domain Operational amplifier circuits |