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Unformatted text preview: Lecture 32 Friday April 22 EE 332 Semiconductor Devices Problem Assignment Monday ! Problems 9.2 and find the depletion widths at collector and emitter junctions for the transistor in problem 9.5 Wednesday ! Problem 9.5 and 9.12 Friday ! Problem 9.13 Coupled-Diode Model and Constants B B nB E nE F W n D qA I I ) ( + = = B B B nB E R W x n D qA I ) ( − − = Defining Saturation Current I F0 Thus I E when the emitter is forward biased and V CB =0 is: ( ) 1 / − = = kT qV F EF F EB e I I I I F0 =I ES = Emitter saturation current with collector short circuited i.e. V CB =0, ∆ n B (x- B )=0 because ( ) 1 / = − kT qV CB e Collector Saturation Current I R0 The collector current, I C , in this case is called the inverted mode current and is: ( ) 1 / − − = = kT qV R CR R CB e I I I I R0 =I CS = Collector saturation current with emitter short circuited i.e. V EB =0, ∆ n B (0 + )=0 because ( ) 1 / = − kT qV EB e Switching between the normal “forward” mode and the inverted (reverse) mode switches the role of the...
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This note was uploaded on 06/30/2010 for the course EECE 332 taught by Professor Constable during the Spring '08 term at Binghamton.
- Spring '08