Silicon Diode Characteristics

However unlike a resistor a diode does not behave linearly with respect to the applied voltage as the diode has an exponential current voltage i v relationship and therefore we can not described its operation by simply using an equation such as ohms law. We will also see more clearly how real diode characteristics are both similar to and different.

Draw V I Characteristic Of A P N Junc Diode In A Forward

Pn Junction Diode And Diode Characteristics

Diode Definition Symbol Types Uses Britannica

For the silicon diode characteristics in fig.

Silicon diode characteristics. In figure 12 there are two diodes that represent these concepts. 211 are typically used in applications such as power supplies using both high voltage and high current where they rectify the incoming mains line voltage and must pass all of the current required by whatever circuit they are supplying which could be several amperes or tens of amperes. In the practical example of a diode a piece of silicon is doped with two different dopants such as boron on one side and arsenic on the other.

Objective in this lab you will measure the i v characteristics of the rectifier and zener diodes in both forward and reverse bias mode as well as learn what mechanisms cause current flow in each region of diode operation. For a silicon diode the boron doped side is called p type silicon. Semiconductor diodes are characterized by non linear currentvoltage characteristics as the current flowing through a forward biased common silicon diode is limited by the ohmic resistance of the pn junction.

With these descriptions of the ideal diodes characteristics we can note that any external circuit must limit the forward current that flows through a diode as well as the reverse voltage across a cutoff diode to set values. 2 4 v f 07 v i r 100 na and v br 75 v. A diode is considered reverse biased when the cathode n type silicon is connected to a positive potential and the anode p type silicon is connected to the negative potential.

The point where the boron doped side meets the arsenic doped side is called a p n junction. In this lab you are to measure i v characteristics of rectifier and zener diodes in both forward and reverse bias mode as well as learn to recognize what mechanisms cause current flow in each region of diode operation. If the diode was an ideal component it would not conduct at all in this situation however no component is ideal and the diode does conduct a negligible amount.

Silicon diode characteristics 1. Thus if an external voltage greater than and opposite to the built in voltage is applied a current will flow and the diode is said to be turned on as it has been given an external forward bias. A pn junction diode is one of the simplest semiconductor devices around and which has the characteristic of passing current in only one direction only.

For silicon diodes the built in potential is approximately 07 v 03 v for germanium and 02 v for schottky. Rectifier diodes like those shown in figure. The diode is commonly said to have a forward threshold voltage above which it conducts and below which conduction stops.

I v characteristic curves of semiconductors. The values of these quantities are normally listed on the diode data sheet provided by device manufacturers. Some of the parameters can be determined directly from the forward and reverse characteristics of diode.