100_dB_DYNAMIC_RANGE

Published:2009/7/14 3:11:00 Author:May | From:SeekIC

Circuit generates log ratio of currents Ic1, and Ic2, with accuracy within 3% from 10 nA to 1 mA (100dB range) when Ic2 is fixed at 10-μA reference value. Accuracy increases to 1% for current inputs between 40 nA and 400 μA (80 dB). A2 supplies constant reference current to Q2.Q1 is operated as transdiode withQ2 providing temperature compensation of offset voltage.-W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974 ,p 213-214.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/Digital_Circuit/100_dB_DYNAMIC_RANGE.html

Print this Page | Comments | Reading(3)