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20101ee115A_1_ee115a_winter10Hw3

# 20101ee115A_1_ee115a_winter10Hw3 - EE115A Winter10...

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EE115A Frank Chang Winter10 Homework #3 Due Tue, Feb 2th, 2010 5PM Problem 1. The terminal of voltage of various npn/pnp transistors are measured and shown in the following table. Case Type E (V) B (V) C (V) 1 npn 0.2 0.8 0.1 2 npn 0.4 -0.3 -1 3 npn 0.6 1.2 0.5 4 npn 0.2 0.9 0.9 5 npn 0.6 0 0.7 6 pnp -0.2 -0.2 0.5 7 pnp 0.7 0 0 8 pnp 0.2 0.7 0.3 9 pnp 0.4 0.3 -0.2 10 pnp 0.5 -0.9 -0.7 Identify the mode of operation for each transistors. (Assume |V CE,sat |=0.2V). Problem 2. Measurements taken on a variety of transistors are found to be incomplete (or possibly in error). Available data are shown. Provide the missing data and calculations, and detect inconsistencies, if any. Device I C (mA) I B (mA) I E (mA) α β 1 10.0 10.1 100 2 0.63 0.984 63 3 0.001 0.011 10 4 0.015 0.995 193

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Problem 3. Two transistors, fabricated with the same technology but having different junction areas, when operated at a base-emitter voltage of 0.69V, have collector currents of 0.13 and 10.9 mA. Find I S for each device. What are the relative junction areas?
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