Karakteristik Tegangan Dioda Zener

type='html'>

Gambar dan simbol dioda zener

Zener diode is specially designed to operate in the reverse biased mode. It is acting as normal diode while forward biasing. It has a particular voltage known as break down voltage, at which the diode break downs while reverse biased. In the case of normal diodes the diode damages at the break down voltage. But zener diode is specially designed to operate in the reverse breakdown region.

The principle of zener diode is the zener breakdown. When a diode is heavily doped, it’s depletion region will be narrow. When a high reverse voltage is applied across the junction, there will be very strong electric field at the junction. And the electron hole pair generation takes place. Thus heavy current flows. This is known as Zener break down.

So a zener diode, in a forward biased condition acts as a normal diode. In reverse biased mode, after the break down of junction current through diode increases sharply. But the voltage across it remains constant

Gambar Karakteristik Tegangan Diode zener

Funsi dioda Zener

Zener function is to stabilize the voltage. At the time connected in parallel with a source voltage swings are installed so that the ration-back, a zener diode will act like a short circuit (short-circuit) voltage when the voltage reaches the diode damage. The result, the voltage will be limited to a number that has been known previously.

Aplikasi dioda zener

Fungsi Dan Karakteristik Photodioda BPW41N

type='html'>Fungsi Dan Karakteristik Photodioda

Photodioda often used as a catcher of light waves emitted by the Infrared. The amount of voltage or electrical current generated by the size depends photodioda radiation emitted by the infrared.

Photodiodes made from semiconductors with a popular material is silicon or gallium arsenide, and others include InSb, Carbuncle, PbSe. This Photodioda (BPW41N) can detect infrared light with wavelengths ranging from 800 to 1100 nm with a peak sensitivity at 950 nm wavelength as shown in the picture below

Photodioda BPW41N

Kurva karakteristik photodioda BPW41N

When a photon (a unit of light energy) from the light source is absorbed, it is generating an electron and produces a single pair of charge carriers, an electron and a hole where a hole is part of the semiconductor lattice is losing electrons. The direction of current through a semiconductor is opposite to the motion of charge carriers. I was in a Photodiode used to collect photons - causing charge carriers (such as current or voltage) flows / formed in the electrode parts.

Rangkaian Penkondisi Sinyal dari Photodioda

This circuit is used as a current-to-voltage converter by a factor of 1000 times (set by R3) due to backflow photodioda range from 1 to 100 UA the output of U1A is ranged from -1 to -100 mV. Negative voltage is then amplified again by the inverting amplifier circuit to the value corresponding to the input level of need, amount of reinforcement is done by adjusting the value potensimeter R1.