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Fall 2008 ELEG 340 Homework Assignments for Solid-State Electronics, Assignments of Solid State Physics

University of Delaware (UD)Solid State Physics

Information about homework assignments for the solid-state electronics course (eleg 340) offered at the university of delaware in fall 2008. The assignments include problems related to the ebers-moll equations, base width narrowing (early effect), and the difference between metallurgical base width and neutral base width. Students are advised to use the textbook 'streetman-banerjee' for reference and to submit their work online with their name, due date, and assignment number.

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ELEG 340: Solid-State Electronics, Fall 2008
Homework #9 (rev) - due Tuesday, 18 November 2008, at the beginning of class
1. Problem 7.7, p. 392 of Streetman-Banerjee, 6th edition. Hint: use the Ebers-Moll equations in form
of Eqn. (7-34) and used the distribution most like that of a simple p-n junction diode. The idea is to find
the ΔpE and ΔpC that are most like those of an ideal pn diode.
2. Problem 7.10 (without drawing the current arrows), p. 393 of Streetman-Banerjee, 6th edition. Note:
do not show the current arrows and directions; just calculate the parameters.
3. Problem 7.11, p. 393 of Streetman-Banerjee, 6th edition. How much does the base width narrow
compared to the equilibrium value? Hint: this is called the Early effect, after James Early. Note that
VCB = -50 V using our sign convention.
4. Problem 7.18 (VEB = 0.2 V only), p. 394 of Streetman-Banerjee, 6th edition. This problem
emphasizes the difference between metallurgical base width Wmet (or Lb as on p. 371 or text), and
neutral base width WB. Hint: since the emitter doping >> base doping, assume that the depletion width
WBE extends only into the base, so that the base portion of WBE = its full value. Note – calculate only for
VEB = 0.2 V; do not repeat the calculation for VEB = 0.6 V
5. Problem 7.24, p. 395 of Streetman-Banerjee, 6th edition. Only calculate the emitter base bias; do not
comment on the injection efficiency.
Homework assignments will appear on the web at:
http://www.ece.udel.edu/~kolodzey/courses/eleg340f08.html
Note: On each homework and report submission, please give your name, the due date, assignment
number and the course number.

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ELEG 340: Solid-State Electronics, Fall 2008

Homework #9 (rev) - due Tuesday, 18 November 2008, at the beginning of class

  1. Problem 7.7, p. 392 of Streetman-Banerjee, 6th edition. Hint: use the Ebers-Moll equations in form of Eqn. (7-34) and used the distribution most like that of a simple p-n junction diode. The idea is to find the ΔpE and ΔpC that are most like those of an ideal pn diode.
  2. Problem 7.10 (without drawing the current arrows), p. 393 of Streetman-Banerjee, 6 th^ edition. Note: do not show the current arrows and directions; just calculate the parameters.
  3. Problem 7.11, p. 393 of Streetman-Banerjee, 6th^ edition. How much does the base width narrow compared to the equilibrium value? Hint: this is called the Early effect, after James Early. Note that VCB = -50 V using our sign convention.
  4. Problem 7.18 (VEB = 0.2 V only), p. 394 of Streetman-Banerjee, 6 th^ edition. This problem emphasizes the difference between metallurgical base width Wmet (or Lb as on p. 371 or text), and neutral base width WB. Hint: since the emitter doping >> base doping, assume that the depletion width WBE extends only into the base, so that the base portion of WBE = its full value. Note – calculate only for VEB = 0.2 V; do not repeat the calculation for VEB = 0.6 V
  5. Problem 7.24, p. 395 of Streetman-Banerjee, 6th^ edition. Only calculate the emitter base bias; do not comment on the injection efficiency.

Homework assignments will appear on the web at: http://www.ece.udel.edu/~kolodzey/courses/eleg340f08.html

Note: On each homework and report submission, please give your name, the due date, assignment number and the course number.