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]
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