Logarithmic function-transformation circuit with negative input voltage E1 ( logarithmic amplifier 4127)

Published:2012/8/22 21:22:00 Author:Ecco | Keyword: Logarithmic, function-transformation circuit , negative input voltage, E1, logarithmic amplifier | From:SeekIC

As shown in the figure, the circuit is logarithmic function-transformation circuit when thesignal E1is input asvoltage form and E1 is a negative. When the input E1 is added to pin 7 of 4127 with negative direction, the output voltage Eo=-A•log(|E1|/R4 • IR), then output is transformed to logarithmic form.



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