The bias zeroing circuit of logarithm and logarithmic ratio amplifier LOG100

Published:2012/8/13 21:43:00 Author:Ecco | Keyword: bias , zeroing circuit , logarithm, logarithmic, ratio amplifier | From:SeekIC

The circuit uses two 10kΩ potentiometers R2 , R2 to make zero set for input bias current ofinternal amplifiers A1, A2. Internal amplifiers A1 , A2are field effect transistor (FET) inputs, so the FET inputs havebias current feature which meansthe temperature increases 10 ℃, input bias current will be doubling. This bias zeroingcircuit can beonly used for the occasions with stable temperature.



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