Use common components high-precision polarity conversion circuit

Published:2011/6/3 11:00:00 Author:Fiona | Keyword: Use common components, high-precision, polarity conversion | From:SeekIC

circuit work Because the OP amp loop gain mainly depends on the ratio of input resistance and the feedback resistance .So resistance has margin of error, the gain will be a corresponding errors.To get more than four-digit precision, we need high-precision resistor. The resistor R3, R4 used to narrow the variable scope of VR1 is 1 / 100 of the R1, R2 resistance, so that you can compensate the deviation of the resistance, in fact,R1 is 9.9 k ohms , R2 is 10.1 k ohms.This worst case is very small, so it is enough that the adjustable range of the VR1 is ± 1%. Component Selection



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