An electronic circuit with a logarithmic detector performs the following operations: receiving an input voltage, generating a series of subsequently amplified versions of the input voltage, rectifying the versions, thereupon rescaling and converting the versions into currents, summing the currents and...http://www.google.ca/patents/US5338985?utm_source=gb-gplus-sharePatent US5338985 - Low voltage, simplified and temperature compensated logarithmic detector
