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midterm1-2009-solutions

# midterm1-2009-solutions - ELE312 MIDTERM I(Part B Name...

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ELE312 Q4 Q5 Q6 MIDTERM I (Part B) Name: Student No: 31/03/2009 Solve 4 questions out of 6 in total (Parts A and B). Good Luck. Q4. (25 points) Consider the DTL circuit below. Assume all diodes are identical. a. Calculate the maximum fan-out. b. Calculate the average power dissipated. c. Explain the role of R 2 and R 3 in the circuit. SOLUTION : a. Fan-out is determined by the output low state,  76 5 76 367 1 64 104 I I N IL OL . . . (max) I IL = I R1 (OH) = 1.367 mA I RC (OL) = 0.96 mA, I R3 (OL) = 0.16 mA, I R1 (OL) = 2.8 mA (ignore I R2 as I R2 << I R1 ). I E,I (FA) = I R1 (OL) = 2.8 mA I B,O (SAT) = I E,I (FA) - I R3 (OL) = 2.64 mA I C,O (SAT) = F I B,O (SAT) = 105.6 mA I OL (max) = I C,O (SAT) – I RC (OL) = 104.64 mA b. mW 8 12 5 m 56 2 5 2 m 367 1 m 76 3 V 2 I I P CC OH CC OL CC CC . . . . ) ( ) ( I CC (OL) = I R1 (OL) + I RC (OL) = 2.8m + 0.96m = 3.76 mA. I

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midterm1-2009-solutions - ELE312 MIDTERM I(Part B Name...

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