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What does the alternating load line's slope depend on?

  • A.The load the signal actually sees
  • B.The supply voltage and the total series resistance together
  • C.The quiescent current the bias network has established
  • D.The device's own output resistance at the operating point

Answer: A

The signal sees the collector resistor in parallel with any coupled load, and any bypassed emitter resistor as a short, so that combination sets the slope. The supply and total resistance define the direct load line, and the quiescent current locates the pivot rather than the slope. The device's output resistance is usually far higher and negligible. Two load lines with different slopes through one point is the standard picture, and knowing which resistances belong to each is the whole of drawing it.

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