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How is that spread handled graphically?

  • A.The transconductance is computed at the nominal operating point
  • B.A bias line is drawn across the maximum and minimum transfer curves
  • C.The average of the two extreme curves is used for the design
  • D.The load line is drawn on the output characteristics instead

Answer: B

Drawing the self-bias line across both extreme transfer curves shows the range of operating points the design will actually produce, and the source resistor is chosen so that range is acceptable. Averaging the curves hides exactly the information wanted. The output load line answers a different question. Designing against a range rather than a nominal value is what makes a circuit manufacturable, and here the graphical method makes the range visible. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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