Week 2 Semi conductors Exam review

Simplest part of a semi-conductor component

Anode and Cathode

PN Junction allow current to flow in

One direction

Area at the junction where the electrons and holes are far fewer in number (depleted)

Depletion region

Barrier voltage Silicon

0.7V

Barrier Voltage Germanium

0.3V

Voltage applied to a diode in an electrical circuit

Diode Biasing

Forward Biasing

Reverse Biasing

Forward Biasing schematic

Reverse Biasing Schematic

The maximum safe reverse voltage that can be applied to the diode

PIV/PRV

The maximum forward-biased current that the diode can safely handle

If max

Testing PN Junction diodes can determine

The polarity of a diode's lead and serviceability/qualitive check

, black lead is cathode and red lead anode indicates

Low resistance and forward biasing

black lead is anode and red lead cathode indicates

High resistance and reverse biasing

Using the Diode check reverse biasing shows

.0L

Using the diode check and forward biasing shows

Voltage drop instead of low resistance

Specially constructed to take advantage of reverse current operation

Zener Diodes

Used for regulating voltage in many circuits

Zener Diodes

Zener Diode

Varicap

Are primarily used in a resonant circuit where some level of tuning or frequency is desired

Varactor Diode

The capacitance of the diode varies

Inversely with its bias voltage

A popular type of optoelectronic semiconductor device

Light Emitting Diode

Light Emitting Diode (LED)

What segments are used to make a 5

A,F,G,C,D

3 multiple choice options

Which way does conventional current flow on a diode

Anode to Cathode

LED Wavelength and colour of light emitted is determining on the

band gap energy

Light is produced when

free electrons combine with holes