Voltage ratio to current circuit

摘要

A circuit for providing an output current proportional to a first voltage raised to a fractional exponential power divided by a second voltage raised to a fractional exponential power, is supplied. The circuit has four strings of series connected pn junctions. The first and second voltages are connected to the first and fourth string, respectively. A reference current is provided to the second string, while the third string provides the output current. The number of pn junctions are chosen to give the desired fractional exponents of the two voltages while the number of pn junctions in the third string is selected to adjust for the number of pn junctions in the other strings.