EE 40, Midterm 2, Spring 1997 Electrical Engineering Exam, Exams of Microelectronic Circuits

Download EE 40, Midterm 2, Spring 1997 Electrical Engineering Exam and more Exams Microelectronic Circuits in PDF only on Docsity! EE 40, Spring/1997 Midterm #2 Professors T.-J. King and R.M White Problem #1 (18 points) What is the phasor corresponding to vs(t)? Express your answer in exponential and rectangular forms. [4 pts.] a. What is the impedance seen by the voltage source? Express your answer in exponential and rectangular forms. [5 pts.] b. What is the instantaneous current delivered by the voltage source? [4 pts.]c. What is the time-averaged power supplied by the voltage source? [5 pts.]d. Problem #2 (20 points) What is the transfer function G = vOUT/vIN at very low frequency, w approaching 0? [2 pts.]a. What is the transfer function G = vOUT/vIN at very high frequency, w approaching infinity? [2 pts.]b. For what intermediate frequency w0 is G real? [6 pts.]c. What is G(w0)? [4 pts.]d. Sketch the general behavior of |G(w)| vs. w on the axes provided. (y-axis from 0 to 1, x-axis from 0 to 109). Note: This is not a Bode plot. Indicate values of |G(0.5w0)| and |G(2w0)| on your plot. [6 pts.] e. EE 40, Midterm #2, Spring 1997 EE 40, Spring/1997 Midterm #2 Professors T.-J. King and R.M White 1 Problem #3 (25 points) v 1 (t) is -3 V for all tt = 0. What is the value of ic at t = 0-? [2 pts.]a. What is the value of vc at t = 0-? [4 pts.]b. What is the value of ic at t = 0+? [4 pts.]c. Find an expression for vc, for t>0. [5 pts.]d. Sketch vc for all t. (Label the axes on the plot.) [4 pts.]e. Find an expression for ic, for t>0. [3 pts.]f. Sketch ic for all t. (Label the axes on the plot.) [3 pts.]g. Problem #4 (20 points) Identify all corner frequencies. [6 pts.]a. How many poles and zeros are in the transfer function? [3 pts.]b. Write an expression for the transfer function G(w), assuming that the magnitude is 20 dB at w = 0.1 rad/sec. [4 pts.] c. Neatly sketch the Bode magnitude plot (magnitude of G(w) in decibels vs. frequency on a logarithmic scale). Straight-line approximations are adequate. [7 pts.] d. EE 40, Midterm #2, Spring 1997 Problem #3 (25 points) 2