Question: Fig. 6.61 shows an alternate scheme for biasing the NE5234 output stage . Ignoring all base currents, find |I C74 | I C75 . Use

Fig. 6.61 shows an alternate scheme for biasing the NE5234 output stage_.Ignoring all base currents, find |I_C74| I_C75. Use Fig. 6.42 for the relative emitter areas of all the transistors except assume that Q₄₆is identical to Q₄₃.

Figure 6.61

Vcc R65 R43 7.5 k2 1.3 k2 IREF = |!c36l – Ic35 7.4 μΑ Pbase Q64 Q43 Q74 Q68 25 Out 26 Q40 Q39 Q65 Оз7 R46 R40 R39.

Figure 6.42

Vcc R65 R43 7.5 k2 1.3 k2 IREF = |!c36l Ic35 7.4 Pbase Q64 Q43 Q74 Q68 25 Out 26 Q40 Q39 Q65 7 R46 R40 R39. 1.3 k2 2.5 kn Q75 2.5 k2 Nbase Q46 Ic69 Ic63 33 IC41 18 6 8 -VEE = 0 7.4 7.29 -7.4 Qid Q2 O39 -6.79 9.0 8.33 9.0 8.48 -3.0 -2.65 Q41 Q42 Q43 18 17.2 28 27.3 Q4 -3.0 -2.63 -28 -27.9 4 -6.0 -5.79 Qs Q6 Qas -0.93 -0.939 1 -5.1 -4.15 1 -6.0 -5.76 3.06 6.16 -5.25 Qs Q9 3.0 Q4s Qs9 Os0 Qs1 Os2 Qs3 Os4 Os Oss -6.0 6.0 6.0 5.74 6.0 6.17 -6.0 -5.80 -6.0 -5.81 -6.0 -5.01 Q12 -3.0 -3.14 6.0 6.73 -6.0 -5.84 6.0 5.74 Q14 1 -6.0 -5.84 -6.0 -5.76 -3.13 -4.01 -3.0 -6.0 -15.9 Q16 -4.0 6.0 5.01 Q17 Q18 Q19 1 -21 -17.6 Os7 Qss Os9 6.0 5.85 -21 -17.7 -6.0 -5.76 -4.0 -4.01 6.0 5.64 -6.35 Q20 Q21 Q2 Q23 Q24 -6.6 6.0 5.78 -4.0 -3.25 -6.0 -5.83 -4.0 -3.38 6.0 5.08 33 25.3 Q64 Qos Q66 Q67 Q68 13 5.04 10 9.13 -200 -216 Q26 Q27 Q28 Q29 O31 10 8.94 -37 -43.2 10 6.19 10 6.19 11 12.0 42 34.0 6.0 5.75 6.6 5.23 6.6 5.50 21 25.9 -6.6 -4.59 O34 Qn Q73 Q74 -6.6 -4.81 6.6 4.58 32 -1200 -1260 6.6 4.70 10 210 264 6 1 -14 -12.4 242 t24

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