UPWARD_SCALING

Published:2009/7/15 22:23:00 Author:Jessie | From:SeekIC

Output of AD580 threeterminal voltage regulator is multiplied in shunt regulator loop using opamp A,. Resulting reference voltage VEEF is scaled upward by reciprocal of feedback divider R1/R2. Resulting reference is immune to input variations. Reference output range is from 5 V up to voltage limit of opamp used. If desired, reference value can be programmed via R1. LED lights to show proper operation of circuit.-W. G. Jung, Programmable Voltage Reference is Stable, yet Simple, EDN Magazine, Nov. 5, 1975, p 98 and 100.



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