2010_ece2c_final_b

2010_ece2c_final_b - ECE 2C Final Exam June 8 , 2010 Do not...

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1 b ECE 2C Final Exam June 8 , 2010 Do not open exam until instructed to. Closed book: Crib sheet and 2 pages personal notes permitted There are 4 problems on this exam, and you have 3 hours. Use any and all reasonable approximations (5% accuracy is fine. ) , AFTER STATING and approximately Justifying them. Name: _______________________ Problem Points Received Points Possible 1a 5 1b 5 1c 5 1d 5 1e 5 1f 10 2a 10 2b 10 2c 10 2d 10 3a 10 3b 10 3c 5 3d 5 3e 5 4a 5 4b 5 4c 5 4d 5 4e 5 4f 10 total 155
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2 b Problem 1, 40 points You will be working on the circuit below: R L C out Q 1 R SS R g C in R gen V gen V in V DD -V SS V out Q1 is a mobility-limited FET, i.e. ) 1 ( ) )( 2 / ( 2 ds th gs g g ox d V V V L W C I where ) 2 / ( g g ox L W C =4 2 V / mA , 1 V 1 . 0 , and th V =0.2 V. +Vcc= +2.0 volts, -Vss= -2 Volts Cin1 and Cout are very big and have negligible AC impedance. RL=10 kOhm Rgen=1 MOhm, Rg=10 MOhm
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3 b Part a, 5 points DC bias. Q1 is to be biased with 1 mA drain current. Ignore while solving this part. Find: Rss=_______________ The DC voltage at the source of Q1. =_______________
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4 b Part b, 5 points DC bias R L C out Q 1 R SS R g C in R gen V gen V in V DD -V SS V out On the circuit diagram above, label the DC voltages at ALL nodes and the DC currents through ALL resistors
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5 b Part c, 5 points Find the small signal parameters of Q1. Use the constant-mobility model. gm=_________ Rds=________
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b Part d, 5 points Replacing the transistor with its small-signal model, draw a small-signal equivalent circuit diagram for the amplifier. Give values for all elements on the diagram.
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2010_ece2c_final_b - ECE 2C Final Exam June 8 , 2010 Do not...

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