`V_"out" = -V_T*ln( V_"in" /( I_S * R ))`

Enter a value for all fields

The Op-Amp Log Amplifier is found using the following formula: `V_"out"=-V_Tln(V_"in"/(I_SR))`, where: 

• `V_T` = thermal voltage `(V_T=(kT)/q)`
• `V_"in"` = input voltage
• `I_S` = saturation current
• `R` = resistance

References

The formula, definition, and image are from Wikipedia (https://en.wikipedia.org/wiki/Log_amplifier).