Analog Electronics
The junction capacitance of linearly graded junction varies with the applied reverse bias, VR as

  (VR)1/2.
  (VR)- 1.
  (VR)- 1/2.
  (VR)- 1/3.

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Analog Electronics
A working diode must have

 Low resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias

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