Logarithmic amplifier

  
Unusual frequency compensation gives this logarithmic converter a 100 µs time constant from 1 mA down to 100 µA, increasing from 200 µe to 200 ms from 10 nA to 10 pA. Optional bias current compensation can give 10 pA resolution from - 55 °C to 100 °C
Logarithmic amplifier - schematic

Scale factor is 1 V/decade and temperature compensated.




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