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Electrical Engineering Department King Fahd University of Petroleum & Minerals EE 303 Electronic Circuits II Final Exam Tuesday, 07th June 2011 07:30 am – 10:00 am Dr. Badr Abdullah Name ID Number Section Number Problem Score Out of 1 10 2 20 3 20 4 20 Total Good luck Problem 1 Identify the filter type of the following transfer functions; then draw each circuit giving all component values. = −10s + 10 10 = + 10 + 10 Problem 2 The following circuit has the following properties; supply voltage is ±10V, R1=100kΩ, R2=R=1MΩ and C=0.01µF. The period is given by = 2 a) Calculate the frequency of oscillation. b) Sketch , . c) How would you modify this circuit so that the frequency of oscillation becomes a function of temperature. d) Based on the given oscillator circuit, design a new circuit to obtain a triangular and sine wave outputs. R1 R2 v+ -VCC vo +VCC R v− C Problem 3 Consider the following amplifier, neglect ro; a) Identify the amplifier type. b) Draw the A circuit. c) Give an expression for A, Af and β. d) Give an expression for Ri and Ro. VCC VCC RC I Vo CC RL Q2 Q1 Io Rs Vs Rf RE Problem 4 The amplifier shown below has Rsig=RL=1kΩ, RC=1kΩ, RB=47kΩ, β=100, Cµ =0.8pF, rπ=4.63kΩ, gm=21.6mA/V and fT=600MHz. a) Neglecting ro and rx, calculate the midband gain . b) Calculate fH. c) If RB is now connected between the base and collector of the BJT, calculate the component of Rin that arises as a result of RB. d) Re-calculate fH. VCC RC CC Vo RL Rsig Vsig