Complete the following problems:
Q1 A particular diode is found to conduct 1 mA with a junction voltage of 0.7 V. What current will flow in this diode if the junction voltage is raised to 0.71 V? To 0.8 V? If the junction voltage is lowered to 0.69 V? To 0.6 V? What change in junction voltage will increase the diode current by a factor of 10?
Q2 The following measurements are taken on particular junction diodes for which V is the terminal voltage and I is the diode current. For each diode, estimate values of IS and the terminal voltage at 10% of the measured current.
(a) V = 0.700 V at I = 1.00 A
(b) V = 0.650 V at I = 1.00 mA
(c) V = 0.650 V at I = 10 μA
(d) V = 0.700 V at I = 100 mA
Q3 Listed below are the results of measurements taken on several different junction diodes. For each diode, the data provided are the diode current I and the corresponding diode voltage V. In each case, estimate IS , and the diode voltage at 10I and I/10.
(a) 10.0 mA, 700 mV
(b) 1.0 mA, 700 mV
(c) 10 A, 800 mV
(d) 1 mA, 700 mV
(e) 10 μA, 600 mV
Q4 The circuit in Fig. P4.23 utilizes three identical diodes having IS = 10-14 A. Find the value of the current I required to obtain an output voltage VO = 2.0 V. If a current of 1 Ma is drawn away from the output terminal by a load, what is the change in output voltage?
