EECE 310 Homework 2, Fall 2011

American University of Beirut DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING EECE 310 – Electronics Fall 2011 – 2012 Due Wednesday October 12, 2011 at 9:00 am Homework 2 1. [10 points] A junction diode operating at a temperature of 37 degrees C is conducting a current of 0.33 mA, and has n = 1.2. (a) [5 points] What is the value of IS for this diode if the diode voltage is 0.777 V? (b) [5 points] What is the change in the diode voltage if the current increases by a factor of 1000? 2. [60 points] Find the operating point (ID, VD) for the diodes in the circuits shown below. Assume that all the diodes are ideal. [5 points for the ID value per diode, 5 points for the VD value per diode]. 3. [30 points] a. [10 points] Assume that the diode in the circuit below is ideal. Find the operating point (ID, VD) of the diode. Hint: Use the Thévenin equivalent circuit. b. Repeat part (a) for a real diode at a temperature of 27 degrees C with n = 1.2 and IS = 10-14 A, using: i. [10 points] Iterations with an initial guess for ID equal to the value found in part (a) ii. [10 points] The graphical load line method.