Quiz1_Practice_Problems_F09

Quiz1_Practice_Problems_F09 - Name Student Number ELEC 3908...

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Name:___________________ Student Number:___________________ ELEC 3908 – Physical Electronics Quiz #1 Practice Problem Set ? Minutes September 26, 2009 - No aids except a non-programmable calculator - All questions must be answered - All questions have equal weight - Answer questions on quiz sheets (use backs if necessary) - Write your student number at the top of each page
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Student #:_____________________ 2 1. A “clipper” circuit can be built by using a parallel combination of two diodes and a resistor, as shown below. a) Assuming the two diodes, D 1 and D 2 can be considered to be ideal and identical, derive an expression for the I C versus V C relationship for the circuit. b) Sketch the resulting I-V characteristic using appropriate linear and logarithmic scales and indicate the regions over which each type of plotting might be best used. R C V C D 1 D 2 I C
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Student #:_____________________ 3 2. We wish to fabricate a structure in silicon with the cross-section shown below. a) Assuming all the PN junctions act as isolated diodes and ignoring parasitic resistances, draw the equivalent circuit for this structure in terms of the contacts A, B, C, D and the substrate S. (i.e. draw how the diodes are connected to each other and A, B, C, D and S.) b) How many mask-levels (i.e. patterning steps) are required to fabricate this structure (including metal) and which features of the structure are defined by each mask? (In the order in which they are processed.) p + p + n + n + p n p S A B C D S
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Student #:_____________________ 4 3. Consider a structure fabricated in silicon with the cross-section shown below. a)
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Quiz1_Practice_Problems_F09 - Name Student Number ELEC 3908...

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