Lecture content provided by Kenneth Connor at Rensselaer Polytechnic Institute.

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Presentation transcript:

Lecture content provided by Kenneth Connor at Rensselaer Polytechnic Institute

Diodes w A diode can be considered to be an electrical one-way valve. w They are made from a large variety of materials including silicon, germanium, gallium arsenide, silicon carbide …

Diodes w In effect, diodes act like a flapper valve Note: this is the simplest possible model of a diode

Diodes w For the flapper valve, a small positive pressure is required to open. w Likewise, for a diode, a small positive voltage is required to turn it on. This voltage is like the voltage required to power some electrical device. It is used up turning the device on so the voltages at the two ends of the diode will differ. The voltage required to turn on a diode is typically around volt for a standard silicon diode and a few volts for a light emitting diode (LED)

At the junction, free electrons from the N-type material fill holes from the P- type material. This creates an insulating layer in the middle of the diode called the depletion zone.

Diode V-I Characteristic w For ideal diode, current flows only one way w Real diode is close to ideal Ideal Diode

Diode Characteristics w A very large current can flow when the diode is forward biased. For power diodes, currents of a few amps can flow with bias voltages of 0.6 to 1.5V. w Reverse breakdown voltages can be as low as 50V and as large as 1000V. w Reverse saturation currents I s are around 1nA.

Diode Characteristics w The i D -v D relationship (excluding breakdown) can be written simply as: w Note that for v D less than zero, the exponential term vanishes and the current i D is roughly equal to the saturation current. w For v D greater than zero, the current increases exponentially.

Diode Characteristics w Recall that the i-v relationship for a resistor is given by Ohm’s Law: v=Ri w If we plot this expression, we obtain v i The slope of the straight line is given by the resistance R

i-v Characteristics w Both the simulated current vs. voltage and the characteristic equation for the diode are plotted iDiD

i-v Characteristics w In this exercise, you are asked to find the parameters for the equation w Note that V T =25mV, so you need to find n and I s