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Zener Diode Voltage Temperature
Why is 5,6V the threshold discriminating which effect appear mostly in reverse biased diodes?
I've seen many times a general rule stating that
"A reversely biased diode permits current, due to 2 effects:
-The Zener effect if the applied voltage is LESS than 5,6V
-The avalanche breakdown if the applied voltage is MORE than 5,6V"
Moreover, Wikipedia entry for Zener diode states:
"In a 5.6 V diode, the two effects occur together and their temperature coefficients neatly cancel each other out, thus the 5.6 V diode is the component of choice in temperature-critical applications."
Where does this 5.6V comes from, anyway?!
The two mechanisms are completely different. Zener effect uses tunneling whereas avalanche is somewhat different. Avalanche breakdown can occur within insulating or semiconducting solids, liquids, or gases when the electric field in the material is great enough to accelerate free electrons to the point that, when they strike atoms in the material, they can knock other electrons free: the number of free electrons is thus increased rapidly as newly generated particles become part of the process.
It just so happens that the two are complementary at about 5.6v with the positive temperature co-efficient of the avalanche mechanism canceling out the negative temperature co-efficient of the zener effect.
Transistors base emitter voltage exhibits the same characteristic and many processes aim to set the reverse breakdown voltage to about 5.6v which simplifies the ic design allowing reference voltages with minimal temperature drift.
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Voltage Doubler $54.86 High Quality Content by WIKIPEDIA articles A voltage doubler is an electric circuit with an AC input and a DC output of roughly twice the peak input voltage. They are a variety of voltage multiplier circuit and are often, but not always, a single stage of a general form of such circuits. The term is usually applied to circuits consisting of rectifying diodes and capacitors only, other means of doubling voltages are not included.The Villard circuit consists simply of a capacitor and a diode. While it has the great benefit of simplicity, its output has very poor ripple characteristics. Essentially, the circuit is a diode clamp circuit. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 68 Publication Date: 2010/07/14 Language: English Dimensions: 6.00 x 9.00 x 0.16 inches |
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