Question

ENG 301 Electronics I Homework 2 1 Refer to Figure 1. Assume ß 50 and VBE(on) 0.7 V for all BJTs in the circuit. For Ri 12 kN and Rc 10 k2, find the differential voltage gain (Ad) of the differential amplifier taken as one- sided output at vc +10 V Rc +10 V IREPR -10 V Figure 1 2. Vcc +12 V RCI= 10 k2 R3= 15 k2 67.3 k2 Ris Cci Q1 Cc2 CC3 R4= 45 k2 R2 = 12.7 k R= RE2= REI : CE 250 1.6 k2 2 k2 CopyightThe Mo Compans n Peson eued repeton o ay Figure The circuit shown in Figure has transistor parameters B-120 and (a) Determine the small signal parameters, s and r for both transistors Av (b) Determine the overall small-signal voltage gain www ww ww

Answer 1

E E 12-5 Curre -1OV apply Loop (10) Il xia - 0.7- rO- 20 0- ires 12 1 CI 1.61 1rep 'E' af Node applyoca a0aly are Both Tosistos Le, LE - 1E, 1.61 2 2- O.80S

O. 8OS O. 789 A av 31. 56 RC - qm Ad 2 31. S6xLOx1O (O - 31s- Ad - ISチ. 0D

3SK10K Cer Ris Ro 1-GRP さR. ユ250 ~ CE Fr dats 20 Capaoto ack PC Anahy iS 12 v 12v ミ10K~ SISk 63K 4 shR B1 Noltage divisio Rule 13×13.す 12x 45 6 4.3t 12.7 15+45 905v VBa formla 643×12.す 1S 45 Rer RB 10 K 4.25 k

Toniter - o VT Se VT 5 KIO3 952103 120x 4-768xO 120x 40. S16 as x1o3 3 asxIO 617.2-2 4 S. 24 Kn pos cir cuitedf d mwi sto SMat Sima all capaci tor aNe de activale Ckeqond) ors ces DC tos St 19.7K 619 porall parellef 67.3×13.子 Reg 1 1.x109250 1-Cxi02r0 6. 3t 13.1 10.子 KA S. 29 K 16

Re-dsaw affer Sim pi Cation circwt 5.29 Kr 10-KC 81T equalist AV ChtERS 214 By6.29 - 20x $.2 F)16 S2y Oversll au A, AAV 1 21x 1 - 120x5.2g - 617. S.24 118. 35 Av