9. A zener diode exhibits a certain change in Vz for a certain change in Iz on a portion of the linear characteristic curve between IzK and IZM as illustrated in Figure.05. What is the zener impedance? AVz = 50 mV VR- 10 - 15 mA Aly =5 mA 20nA 10. Calculate the zener impedance if the change in zener voltage is 100 mV for a 20 mA change in zener current on the linear portion of the characteristic curve. 11. An 8.2 V zener diode (8.2 V at ) has a positive temperature coefficient of 0.5% To C What is the zener voltage at 60C? 12. A * V zener has a positive temperature coefficient of 0.075%/ C How much zener voltage change when the junction temperature decreases 50 degrees Celsius? 13. From the datasheet, a IN4736A zener diode has a Zz of 3.5ohm. The datasheet gives VZ 6.8 V at a test current, IZ, of 39 mA. What is the voltage across the zener terminals when the current is 50 mA? When the current is 25 mA? Figure 3-8 represents the zener diode. ZAVZ 14. Repeat the analysis for Iz =10 mA and for Iz =30 mA using a IN4742A zener with Vz =12 V at Iz =21 mA and Zz = 9ohm