Discussion
Why is a field effect input pair used in some amplifiers?
Answer: B
A field effect pair draws essentially no input current, so a high-impedance source is not loaded and no bias current flows through the source resistance to produce an offset. Its transconductance and its offset voltage are both worse than a bipolar pair's, and its common-mode range is a design matter. The two families trade input current against offset and gain, so the choice follows from the source impedance the amplifier has to work from. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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