This is a 50-minute exam. Each problem is worth 20 points. Try to solve each problem, and do not spend all your time on one problem. Write the Shockley equation for a diode in the space below and define all the terms.
Thermal Voltage Use load-line analysis to find the current and voltage labeled in the circuit below.
The diode characteristic is given on the next page. Determine the value of Rx in the voltage-regulator circuit below. The circuit provides a constant voltage of 5 V to a 200-ohm load. Assume the diodes in the circuit below are ideal and determine the voltage across the resistor R3 and the current though R4.