Educational applets in EE

Educational Applets in Electrical Engineering

July 1996: A mirror site for the Applets on Semiconductor Microelectronic Devices is maintained at http://jas.eng.buffalo.edu/ to which all future additions (of new applets) will be made.

 
Semiconductors and Microelectronic Devices 
Educational Applets developed by Prof.C.R.Wie, SUNYAB. He can be reached at 
email:wie@acsu.buffalo.edu; tel:(716)645-2422 ext.1211; or fax:(716)645-5964

List of Applets

Three applets on the Energy Bands and Charge Carriers
- Visualization of diffusion, drift and recombination of excess minority carriers in a semiconductor.
- Indirect recombination via an energy state in the band gap. It also introduces the four basic processes in the Shockley-Read-Hall statistics.
- AlGaAs: Band diagram and E-K diagram
Three applets for the concept of Fermi Level:
- Fermi Function and Localized Energy States and the Temperature effect.
- Carrier Concentration vs. Fermi Level and the doping of donor and acceptor impurities.
- Carrier Concentration vs. Fermi Level and the Density of States
Three applets for the PN junction diode:
- A graphical illustration of the formation of a PN junction diode and its band diagram. It also contains links to a page for the SPICE diode model along with corresponding applets which calculate diode I-V and C-V characteristics and simulate a simple diode circuit, and to a page for a table of SPICE diode model parameters.
- Current Flow in Forward-Biased P-N Junction via animated graphics. It shows the flow carrier electrons and holes as well as the electron and hole currents across the pn junction.
- PN junction diode under bias -- band diagram, current flow, and more.
Two applets on Transistors:
- A set of slides which show the Fabrication Steps of a pair of a Bipolar Transistor and a Field Effect Transistor on a single silicon chip. This is a reproduction of the html Web pages at UIUC into a Java Applet program.
- A simple calculation and plot of n-channel MOSFET drain characteristics .

This applet lets you know of the currently active Java threads in your Web browser.

Some interesting educational applets (engineering)

Here are links to some very good educational applets in electrical engineering and in other disciplines.

Simulation of various CMOS gates
Simulation of basic CMOS gates with explanatory text
Digital Simulator (source code included)
Eddy current simulator
Quantum scattering (reflection and transmission of a wavepacket, source code included)
Numerical simulation of Lorentz equation
The Normal Distribution

In order to develop a good educational applet as a beginner in Java programming, we need to first understand some principles and learn basic GUI components.

Links to Java Websites

SUN Microsystem's Java site.
EarthWeb's Gamelan , a Java Directory.
JARS, Java applet rating service.

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