The amplifer circuit diagram formed by LM118 and used in device

Published:2011/7/16 2:49:00 Author:leo | Keyword: Instrument amplifer | From:SeekIC

Picture 1 is an instrument amplifier. It is made up of LM118 and others. In this circuit, VT1 and VT2 can form surface input circuit. They can form constant flow source which can supply steady current for differential amplifier A1;VD1 can supply base voltage(1.2V) with zero degree temperature factor to constant flow source. In order to make the input circuit have a good linearity working state, The output current of VT3 and VT4 should be double ofthe current passing through it when being added differential voltage.If needing smaller input current, all resistances should be increased by 100 times and replace LM118 with LM318.



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