# Ex2_sol - NAME MIDTERM EXAM 2 SOLUTIONS(Closed book ECE 442...

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NAME ____________________________________ MIDTERM EXAM 2 - SOLUTIONS (Closed book) ECE 442 July 21, 2008 8:00 a.m. – 9:00 a.m. Instructions : Write your name, and NetID where indicated. You are allowed to use one formula sheet (8 1/2 × 11) and a calculator. This examination consists of 2 problems. Show all work in order to receive partial credit. Problem 1 (50 pts) Problem 2 (50 pts) Total (100 pts)

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- 2 - Formula Sheet DIODE / ( 1) D T V V D S I I e = , where 26 mV B T k T V q = = BIPOLAR (NPN forward active I B >0, V CE >V CE , sat ) / / 1 BE T BE T V V V V CE C S S A V I I e I e V = + where 26 mV B T k T V q = = 1 CE C E B B A V I I I I V α β β = = + 1 β α β = + Small Signal Characteristics: ( ) ; ; 1 ; ; A C T m m e e o T E C V I V g g r r r r r V I I = = = + = = π π β β MOSFET (long channel model equations) Define V DSP = V GS -V T , where V T is the threshold voltage NMOS PMOS Triode Region (Linear) & , GS T DS DSP V V V V > < 2 ( ) 2 μ = DS D n ox GS T DS V W I C V V V L Active Region (Saturation) & , GS T DS DSP V V V V > [ ] 2 ( ) 1 2
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