Diode Chracteristic

Experiment 1: rectifying tube characters

Objective:
* To study the characteristic of atomic number 14 and germanium diodes

Apparatus / Equipment:
Instruments:
DC power depict
procedure Generator
Digital Multimeter (DMM)

Comp hotshotnts:
Diodes: Silicon (D1N4002), Germanium (D1N4148)
Resistors: 1k?, 1M?

Brief Theory:
Diodes is one of the pn junction device which allowed the fuse in one direction.there are two state for diodes that is previous bias and reversed bias.In forward bias positive voltage VD is applied to the p-region of the diodes.the potential barrier decreases.the direction of the applied electric heavens EA is the reversal as that of the E- correction in the space-charge region. The net result is that the electric scope in the space-charge region lower than the thermal equilibrium value. majority carrier electrons from the n-region diffuse into p-region.this will allow the current flow .In reverse bias state,positive voltage is applied to the n-region of the pn junction. Applied voltage VR induces an applied electric field EA.
Direction of the applied field is the same as that of the E-field in the space-charge region.
Magnitude of the electric field in the space-charge region increases above the thermal equilibrium value. increase electric field holds back the holes in the p-region and the electrons in the n-region.



No current across the pn junction

Procedure:
Part A : Forward-bias Diode Characteristics.

1. The circuit of figure below is constructed with the supply (E) is set at 0 V. The calculated value of the resistor is then recorded.

2. The supply voltage is increased until VD reads 0.1 V. Then current ID is measured and the results in remand 1.1 are recorded.

3. Step 2 is retell for the remaining settings of VD as shown in the Table 1.1.

4. The te diode is replaced by a germanium diode and Table 1.2 is completed.

5. A graph paper is plotted which is ID versus VD for the silicon and germanium diodes.
Then, the curves is...If you want to get a full essay, nine it on our website: Ordercustompaper.com



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