ECEN 3250 f16_exam1s 2 Boulder

1. [30 pts] In the circuit shown in Fig. 1, Zener diode parameters are: Vz = Vzo = 6V, r- = 0, Izmin = 0. When the diode is forward biased, the constant-voltage-drop (Vp = 0.7 V) model applies. IR R 12 VCc 9V Figure 1: + VOUT LOUT For the following three values of Iour, find the diode operating region: on (forwardbiased), off (reverse-biased), or breakdown, and solve the circuit to find VoUT and IR: a.1 [5 pts] IoUT = 0 mA Breakdown Vout = Vz = 6V IR=Iz= Vec-Vz= 3 R a.2 [5 pts] IoUT = 5 mA Assume reverse biased Iz=0 IR= Jout = SmA Vat = Voe-IRR = 4V Vout Ve i cousictent corth reverse bias a.3 [5 pts] IoUT = 10 mA Assume forward brased Vord =0,7 V Ip = Vce-Vost= R 9.7mA Iz= IR- Iout = -0,3 mA 3 negative curreud tudicatec foniard bias! 2 07V 10+ 5+ b) [15 pts] Sketch and label the DC transfer characteristic Vour as a function of Iour for 0≤ lOUT ≤ 12 mA in the diagram below.