Logarithmic amplifiers or Logamps as they are commonly called are very useful components. They are used in communications, RF and wireless systems, cell phone base stations, audio systems, and power control to name a few application areas.. A typical use in RF/wireless is in the RSSI ( received signal strength indicator) circuit. The logamp can be deceiving in its functionality so a basic description is of help for those who plan to use it. A paper on this component and its basics is available on the Signal Processing Group Inc. website http://www.signalpro.biz under the “engineer’s corner” menu item.