Discussion
Which is true of a diode detector's efficiency at very low signal levels?
Answer: B
Well below the diode's forward voltage the characteristic is curved, so the detector behaves as a square-law device with the distortion that implies, and its output falls faster than the input. That is why substantial intermediate frequency gain precedes the detector and why the automatic gain control keeps the level high. The diode is less linear near zero, not more. Level independence would be desirable but is not what a junction gives. And exact linearity below the forward drop is the opposite of the truth.
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