The current reference temperature compensation circuit of logarithm and logarithmic ratio amplifier LOG100

Published:2012/8/13 21:24:00 Author:Ecco | Keyword: current reference, temperature compensation , logarithm , logarithmic ratio amplifier | From:SeekIC

If I2 = IREF is set as a constant, IREF is the reference current, the output voltage VOUT = KlogI1/IREF , IREF= 6V/RREF. The figure is IREF's current source circuit generated by the external circuit, the circuit uses 6V 1N834 zener regulator which is connected to 2N2905 transistor's emitter junction in reverse series to make the temperature compensation and improve thetemperature stability of output reference current IREF.



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