Discussion
A pair has \( 80 \ \mathrm{nA} \) bias current with \( 100 \ \mathrm{k\Omega} \) at one input and nothing at the other. The offset produced is
Answer: D
The bias current develops a voltage across the unbalanced resistance:
\[ V = 80 \times 10^{-9} \times 10^{5} = 8 \ \mathrm{mV} \]
giving 8 millivolts, far larger than the pair's own offset voltage of perhaps one. Putting an equal resistance at the other input would cancel almost all of it, leaving only the offset current's contribution. A fault introduced by the surrounding circuit can easily dominate the device's own specification, and this is the commonest example.
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