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Graphical Method of Finding Operating point/ Q-point

Fig 1 Circuit
Fig 2 Characteristic curve

Now draw load line: Load line comes from KVL equation

   ID = (V1-VD) / R1 ...equation 1

  put  ID=0   in equation 1

equation 1  becomes VD=V1=10 (eqA)

Now put VD=0 in equation 1

  equation 1 becomes  ID= V1/1000

  ID = 10mA ( eqB)

Mark  ID=10mA  and  VD=10V  on the characteristic curve and join these two points.


Fid 3 Q-point at the intersection of Load Line and Characteristic Curve

        


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3 comments:

  1. UnknownOctober 10, 2015 2:23 pm

    good explanation.
    how does write the trace expression formula [20e - 3-v1(D1)2e-3]?

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    Replies
    1. diurdacApril 27, 2020 6:10 pm

      You can trace that function using Matlab or simply simulate the circuit on Proteus or LTSpice.

      Delete
  2. diurdacApril 27, 2020 6:05 pm

    This comment has been removed by the author.

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