Question

(1) Determine the working state of ideal diode D. (2) Determine IB (the base current). (3) Determine the voltage at the collector terminal.

5. Consider the circuit consisting of one ideal diode D and one BJT shown in Figure Q4, B = 100, V BE=0.7. [18 marks] > +15 V B = 100 VBE = 0.7 V R1 Bioko 40 R$ 1k2 Rs ç 10 Kot a w 5002 R, B 22 - Vin R₂ ²5kg REB 1ks + 01 Figure Q4

Answer 1

a) the n terminal of diode D is connected to the highest voltage in the circuit , so p terminal cant be greaater than n side voltage.

So it's reverse biased , it acts as a open circuit .

B) to determine Ib and Vc we have to do the DC analysis of the circuit

For DC analysis:

Open circuit all caps and perform analysis of the circuit .

o Dc analysis the comit: VCE 2 0.7V, p=100 Diode D is open. ا یم 50 Tim Elle v > 10 lok Sk Blk Re-5kll lol e-l5k 11. Ev. 5 let lok ) using thevenins model Lok NR RB d IE2 (BH) IB Rp 7 IE 3 lk Applying Kvw in loop * VB - IBRE - VIBE - (BH) IR TRE = 0 5- IB ( 10k + (101)k)-0-7>0 IB= (4.3)/ (0 + 101) Tg24.214 WA

B=100 Vc = 15-R I Ica RIA 15 - 103 x 100 (ul.alu)x10-6 2 15 - 4.1214 Tuc - 10.8780
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