20101ee115A_1_ee115a_winter10Midterm1

# 20101ee115A_1_ee115a_winter10Midterm1 - C1 and I C2. c)...

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EE 115A Winter 2010 Midterm Exam Feb 9 th 2010 Instructor: Prof. M.F. Chang Name: UID: Left student’s name: Right student’s name: Problem1: Problem2: Problem3: Problem4: Bonus: Total:

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Problem 1 (25%) Assume all the diodes are ideal with V D,ON = 0, plot Vout vs. Vin as Vin varies from - to ∞. R R V in V out a) D D D R D R V in V out b) V in V out R R D D c) D D R R V in V out d) V in V out D D R D R R D R e)
Plot the output waveform with time assuming i) RC>>T AND ii) RC = T Problem 2 (25%) -5V 5V T a) V in V out C R b) -5V 5V T C V out V in c) -5V 5V T V in C V out D D d) -5V 5V T V in V out e) -5V 5V T 2R R R 2R R V in V out D D D D

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Assume Is=8*10 -16 , β=100, V A = , |V CE,SAT |=0.2V, find I C , V BE , V CE and identify the region of operation. Problem 3 (25%) a) 2.5V 10uA Q1 Q2 500 Ohm b) 2mA Q 1 2.5V 500 Ohm c) 500 Ohm 1K Ohm Q 1 2.5V d) 2V 2mA 500 Ohm 500 Ohm e) 2.5V 2.5V 0.7V 1K Ohm Q 1 Q 2 Q 1 Q 2
Assume that Is=6*10 -16 ,| V CE, SAT |=0.2V and in parts b) to e) assume β= 100. Problem 4 (25%) a) Design the V CC such that the total currents drawn from it is 5mA and the V CE across Q1 and Q2 is 0.4V. Assume β=∞. b) Now with the Vcc found in part a) and with β=100, find I

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Unformatted text preview: C1 and I C2. c) Find V X and V Y. d) What is the total DC power drawn from V CC ? e) What’s the new V CE for Q 1 and Q 2 and identify their regions of operation? v cc 4K 6K 1K 500 4K 6K 1K 500 V X V Y Q1 Q2 Bonus (25%) Vin R 2R R R 2R Vout +-+-Figure 1a . Vin Vout-5V 5V R 2R R 2R +-+-C T Figure 1b. a) For the circuit shown in figure 1a, find plot Vout vs. Vin as Vin varies from -∞ to + ∞ assuming all the diodes a re ideal and V D,on =0V. b) Repeat part a) only this time V D,on = 0.7V. c) For the circuit shown in figure 1b, plot the output waveform as a function of time assuming RC<<T and the capacitor is not charged initially and V D,on = 0V d) Repeat part c) only this time RC>>T and same assumptions hold. e) If R= 1K and C=2pF, what is the cutoff frequency of the low-pass filter constructed in figure 1b?...
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## This note was uploaded on 09/28/2010 for the course EE EE115A taught by Professor Kaiser during the Winter '09 term at UCLA.

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20101ee115A_1_ee115a_winter10Midterm1 - C1 and I C2. c)...

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