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In a breakdowns diode, the temperature coefficient of breakdown voltage Vz
  • a)
    Is always positive
  • b)
    Is always negative
  • c)
    Is always zero
  • d)
    May be positive or negative
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In a breakdowns diode, the temperature coefficient of breakdown voltag...
Zener breakdown occurs in heavily doped pn-junctions. The heavy doping makes the depletion layer extremely thin. So thin, in fact, carriers can’t accelerate enough to cause impact ionization. With the depletion layer so thin, however, quantum mechanical tunneling through the layer occurs causing current to flow. The temperature coefficient of the Zener mechanism is negative the breakdown voltage for a particular diode decreases with increasing temperature. However, the temperature coefficient is essentially independent of the rated breakdown voltage, and on the order of -3 mV/K.
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In a breakdowns diode, the temperature coefficient of breakdown voltage Vza)Is always positiveb)Is always negativec)Is always zerod)May be positive or negativeCorrect answer is option 'C'. Can you explain this answer?
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