Anti-Log Converter Circuit

Anti-Log Converter Circuit

Anti-log or exponential generation is simply a matter of rearranging the logarithmic circuitry. The circuitry of the log converted to generate an exponential output from a linear input. This is the figure of the circuit;

The emitter of Q2 in proportion to the input voltage is driven by amplifier A1 in conjunction with transistor Q1. The collector current of Q2 varies exponentially with the emitter-base voltage. [Circuit diagram source: National Semiconductor Application Note]