The following circuits represent a logarithm amplifier
The output voltage for a log amp with a diode can be determined by the formula below
Vout = -(.025V)ln(Vin/IR*R1) , the ln is the natural logarithm of a number. Calculate in a table and sketch the output voltage versus the input voltage of the circuit if the Vinput is constant (10mV) and the resistor R1 range is [10:10:100] Ù.