Discussion
Two input stages are compared.
| Parameter | Stage A | Stage B |
|---|---|---|
| Input bias current | 80 nA | 5 pA |
| Offset voltage | 0.5 mV | 3 mV |
| Noise voltage | 3 nV per root hertz | 15 nV per root hertz |
Which stage suits a high-impedance sensor?
Answer: D
A high-impedance source turns bias current into voltage error, so Stage B's picoamps beat Stage A's nanoamps by four orders of magnitude and that dominates everything else. Stage A's better offset and noise voltage would win with a low-impedance source. The two columns are a bipolar and a field effect input stage, and which is better depends entirely on the source impedance - which is why the source has to be named before the comparison can be decided.
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