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semiconductors
EE2 Semiconductor Devices

Switching of bipolar devices

10 lectures – 5 classes
Dr. K. Fobelets
k.fobelets@imperial.ac.uk

Taken from www.necel.com/process/en/ux6b_90nm_bicmos.html

The course aims:

(1) To review the operation of diodes and bipolar junction transistors.
(2) To extend knowledge on bipolar devices to include the influence of recombination.
(3) To investigate the physical mechanisms underlying the delays and speed limitations of the devices.
(4) To extract equivalent circuit models for the devices.

Objectives:

Students should be able to
(1) Explain qualitatively the mechanisms of electronic conduction in bipolar devices, and calculate relevant quantities from given data.
(2) Calculate and explain DC current-voltage behaviour of diodes and BJTs, given their geometry and material properties.
(3) Explain the influence of excess minority carrier recombination of the performance of the devices.
(4) Explain the large signal behaviour of the devices from the internal storage of charge.

Recommended textbooks

EE1 background knowledge on semiconductors and semiconductor devices is required. The EE1 course notes can be found on blackboard.
It is strongly recommended that you read these notes in order to understand the basic principles of semiconductor devices.

“Solid State Electronic Devices”, B.G. Streetman & S. K. Banerjee, Prentice Hall International Editions, 6th ed. This is a more expensive book but the course is based on this book. It contains a lot more than what is taught in the 1st and 2nd year.

“Microelectronic Devices”, K.D. Leaver, IC Press, 2nd ed. This is a compact and relatively inexpensive book which covers all the essentials.

Note that in popular books such as “Microelectronics circuits” by Sedra & Smith some very brief descriptions of semiconductor device operation can be found. Whilst previous two books are very physics oriented, this book is more oriented

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