MIT6_012s09_pset05

# MIT6_012s09_pset05 - regions of a forward biased p-n diode...

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MIT OpenCourseWare http://ocw.mit.edu 6.012 Microelectronic Devices and Circuits Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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Massachusetts Institute of Technology Department of Electrical Engineering Computer Science 6.012 Microelectronic Devices and Circuits Homework #5 Problem 1 You are given a P-N junction diode with the device data shown below. We forward bias the diode at VD = 0.66V. and Device Data a) Calculate the total depletion region width, x D, for this forward biased diode. b) Calculate the minority carrier concentration at -xp ad8xn. c) Calculate the majority carrier concentration at -xp and xn. d) Calculate J~~~~~ (diffusion current density) at x=x, e) Calculate .TPaff at x = Xn. f) Find the ratio of J;'/J\$'~. g) Calculate I, h) Calculate the depletion capacitance. i) Calculate the diffusion capacitance. j) Calculate the conductance gd.
Problem 2 Below is a sketch not to scale of the minority carrier distribution across the quasi-neutral
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Unformatted text preview: regions of a forward biased p-n diode. For this diode, W p – x p = 4 μ m, W n – x n = 3 μ m, D n = 25 cm 2 /s and D p = 10 cm 2 /s. The area of the junction is 10 μ m 2 . a) What is the ratio of the doping levels across the junction: Na/Nd? b) Calculate the hole current injected into the n-side of the diode. c) Calculate the electron current injected into the p-side of the diode. d) Calculate the diffusion capacitance associated with the carrier storage on the n-side of the diode. e) Calculate the diffusion capacitance associated with the carrier storage on the p-side of the diode. f) How much should the voltage across the junction increase if we wish to double the total current through the diode? g) Compute the diffusion capacitance of the diode when we increase the voltage in the manner suggested in the previous question. Problem 3 Howe and Sodini P6.12...
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## This note was uploaded on 09/24/2010 for the course EE 6.012 taught by Professor Charlessodini during the Spring '08 term at MIT.

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MIT6_012s09_pset05 - regions of a forward biased p-n diode...

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