LOGARITHMIC_RATIO

Published:2009/7/14 3:31:00 Author:May | From:SeekIC

Output is proportional to logarithm of ratio of input voltages V1 and V2 for voltages between 0 and 10 V. Each input goes to modified logamp circuit using Analog Devices 180K. Outputs are combined by differential opamp (Analog Devices 184L), with Fairchild μA726 temperature -regulated dual transistor serving asfeedback element. Amicle gives design equations and analyzes possible error sources.-D. R. Morgan, Get the Most Out of Log Amplifiers by Understanding the Error Sources, EDN Magazine, Jan. 20, 1973, p 52-55.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/LOGARITHMIC_RATIO.html

Print this Page | Comments | Reading(3)