Describe and diagram the energy hill for a PN junction. Discuss the different kinds of diodes available and their uses: rectifier, Zener, LED, photodiode and varactor. Detail the device characteristic...Describe and diagram the energy hill for a PN junction. Discuss the different kinds of diodes available and their uses: rectifier, Zener, LED, photodiode and varactor. Detail the device characteristics exhibited by different diode types. Graph the forward- and reverse-bias operation regions of diodes. Determine the effective resistance of a diode under specific conditions. Solve basic DC resistor-diode circuits for various system voltages and currents.