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Simple Definitions

The most important electronics terms, demystified in one place.

Input Bias Current

Our Take

The inputs should have an impedance of infinity, meaning absolutely no current flows into them. However, this is not actually the case. The amount of current that flows through the op-amp input is called the input bias current.

Book Definition

The input bias current is the DC current required by the inputs of the amplifier to properly operate the first stage. By definition, the input bias current is the average of both input currents.

Electronic Devices : Conventional Current Version, 9th Edition by Thomas L. Floyd

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