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What is offset voltage adjustment via OFFSET NULL pin?

April 26, 2017adjustment null offset Pin voltage

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What is offset voltage adjustment via OFFSET NULL pin?

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A2 Adjustment is executed in the input stage’s differential amplifier circuits to balance any unbalance (caused by a difference in VBE). Some operational amplifiers have an adjustment pin called the OFFSET NULL pin (see the diagram of the uPC815 below). The offset voltage is adjusted by externally attaching a variable resistor to this pin to balance the input stage.