Homework%207_Solutions

# Homework%207_Solutions - Homework#7 Due I(20 Problem 7.16...

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Homework #7, Due 11/12/09 I. (20%) Problem 7.16 of the text. Make plots on a log/log scale.

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II. (20%) Problem 7.21 of text, but take the minority carrier lifetime in the collector to be 2500 ps as in the base if necessary. Do not concern yourself with the charge control model or commenting on the results. Assume the emitter width is much greater than the minority carrier diffusion length in the emitter. One way: m 0.197 cm 10 97 . 1 s 10 100 V 0259 . 0 ) s /V cm ( 150 5 12 - 2 , n B n n n E n q T k D L so and m 1.61 cm 10 61 . 1 s 10 2500 V 0259 . 0 ) s /V cm ( 400 4 12 - 2 , p B p p p B p q T k D L so Therefore 9992 . 0 cm / 10 5 ) s cm/V ( 400 m 197 . 0 cm / 10 1 ) s cm/V ( 150 m 2 . 0 1 1 ... 1 3 18 3 16 , , , , , 1 , , , , , E o B p E n B o E n B E o B p E n B o E n B p L n W p L n W 99228 . 0 m
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Homework%207_Solutions - Homework#7 Due I(20 Problem 7.16...

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