Patent ID: 7796173
Filing Date: 2010-09-14
Classification: G01S

Abstract:
1. A logarithmic converter for producing an output signal proportional to a logarithm of an input signal, comprising: a field effect transistor having a source and a drain defining a source-drain path therethrough and a gate; an input port connected to the gate of the field effect transistor for receiving the input signal; a first diode connected in series with the source-drain path of the field effect transistor; a second transistor having an emitter and a collector defining an emitter-collector path therethrough and a base, the base being connected to a junction between the first diode and the field effect transistor; a second diode connected in series with the emitter-collector path of the second transistor; and an output port connected to a junction between the second diode and the emitter-collector path of second transistor.