Distribution box bias current

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Bias current is a problem to the op amp user because it flows in external impedances and produces voltages, which add to system errors. Consider a non-inverting unity gain buffer driven from a source impedance of 1 MΩ. A: The term "input bias current" (IB) in datasheets – for both op amps and fully differential amplifiers (FDAs) – refers to the DC currents flowing into or out of the amplifier's input pins to create a defined operating point during normal operation, as shown in Figure 1. In practice, there are always two input bias currents, IB+ and IB- (see Figure 1). Bipolar transistors: Must force the DC (average) value of VCE and IC to desired values and keep them constant using feedback techniques.

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