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A Zener diode is a type of diode designed to exploit the Zener effect to affect electric current to flow against the normal direction from anode to cathode, when the voltage across its terminals exceeds a certain characteristic threshold, the Zener voltage. Zener diodes are manufactured with a variety of Zener voltages, including variable devices.
In electronics, the Zener effect (employed most notably in the appropriately named Zener diode) is a type of electrical breakdown, discovered by Clarence Melvin Zener. It occurs in a reverse biased p-n diode when the electric field enables tunneling of electrons from the valence to the conduction band of a semiconductor , leading to numerous ...
Zener diode based noise source. A noise generator is a circuit that produces electrical noise (i.e., a random signal). Noise generators are used to test signals for measuring noise figure, frequency response, and other parameters. Noise generators are also used for generating random numbers. [1]
In the Zener diode, the concept of PIV is not applicable. A Zener diode contains a heavily doped p–n junction allowing electrons to tunnel from the valence band of the p-type material to the conduction band of the n-type material, such that the reverse voltage is "clamped" to a known value (called the Zener voltage), and avalanche does not ...
Low threshold voltage diodes (e.g. germanium or Schottky diodes) may be preferable for tracking very small envelopes. The filtering for smoothing the final result is rarely perfect and some "ripple" is likely to remain on the output, particularly for low frequency inputs such from a bass instrument .
Diode load line. The curve shows the diode response (I vs V D) while the straight line shows the behaviour of the linear part of the circuit: I=(V DD-V D)/R.The point of intersection gives the actual current and voltage.
Zener diode Nickname for "voltage regulator diodes" which may rely either on the Zener effect or avalanche breakdown to maintain a roughly constant voltage; the two effects have opposite temperature coefficients of voltage. Ziegler-Nichols tuning method It is a heuristic method of tuning a PID controller. zigzag transformer
Since the forward voltage of a diode is small, this kind of voltage regulator is only suitable for low voltage regulated output. When higher voltage output is needed, a zener diode or series of zener diodes may be employed. Zener diode regulators make use of the zener diode's fixed reverse voltage, which can be quite large.