MASSACHVSETTS INSTITVTE OF TECHNOLOGY Department of Electrical Engineering and Computer Science 6 002 Electronic Circuits Fall 2005 Homework 8 Issued 11 1 2005 Due 11 9 2005 Helpful Readings for this Homework 10 3 10 5 10 6 2 10 6 4 Exercise 8 1 Exercise 10 6 from Agarwal Lang page 570 The equations for parts c and d are v C 10e 10 3 iD 10 6 e 10 t 3 t Problem 8 1 Consider the following circuit with an inductor driving the source follower that was seen earlier in the course Assume that the switch has been in position 1 for a long time before t 0 Transistor M1 has VT 1V 5V R2 L 10mH 2 1 1V R1 R2 vG M1 RS a At t 0 the switch moves from position 1 to position 2 Sketch vG for t 0 assuming that R2 R1 2 Label the initial and final values in terms of R1 and R2 b With R2 100 what is the minimum value of R1 that ensures that M1 never enters the triode mode of operation c With the value of R1 chosen in part b at what time t 0 does M1 enter the cutoff region Problem 8 2 For all parts of this problem C 10 F a What is vC1 t for t 0 in the circuit below 8k 4V t 0 8k 0V C v t C1 b What is vC2 t for t 0 in the circuit below 1k 6V C 0V t 0 v t C2 3k c In the circuit below the initial voltage across the capacitor is 2V At t 0 the switch closes What is vC t for t 0 Hint You should not need to solve any differential equations here vC t 2k C 6k v1 1 5mA 0 0005v1 Problem 8 3 Problem 10 27 from Agarwal Lang page 591
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