Homework Solution: The circuit shown uses compound superbeta transistors (also called the Sziklai topology)…

    The circuit shown uses compound superbeta transistors (also called the Sziklai topology). *?? +VE R3 bl36 01 03 VL 05 R1 04 Vin R4 Assume PL(max) = 20W driving an RL = 4.5? load. Also assume sufficient symmetry in the pull and pull-down transistor so that beta 1 = beta 2 = 25 and beta 3 = beta 4 = 40. Assume that R3, R4 divert 25% of the current away from the base nodes of the Q1, Q2 drive transistors (R3 , R4 increase the ON-OFF speed). Determine: a)VL(max) and resulting ? IS(max) ? b) beta S for each compound transistor pair. c)If Ibias = 4.5mA and the current IR through R1 and R2 is elected to be 0.25mA what values result for quiescent levels IQ and PDQ assuming VS = VL(max)? d)If the power supply is VS = ±15V what is VL(worst) and PD(worst, tot) for the circuit ? e) For part (d) what is the PS at VL = VL(max) and the efficiency?
    *ゆく +VE R3 bl36 01 03 VL 05 R1 04 Vin R4

    Expert Answer

    The tour shown uses unification superbeta transistors (to-boot named the Sziklai topology). *?? +VE R3 bl36 01 03 VL 05 R1 04 Vin R4

    Appropriate PL(max) = 20W driving an RL = 4.5? accuse. To-boot appropriate enough interrelation in the haul and haul-down transistor so that beta 1 = beta 2 = 25 and beta 3 = beta 4 = 40. Appropriate that R3, R4 change 25% of the ordinary loose from the worthiest nodes of the Q1, Q2 cece transistors (R3 , R4 growth the ON-OFF hurry).

    Determine:

    a)VL(max) and conclusioning ? IS(max) ?

    b) beta S ce each unification transistor couple.

    c)If Ibias = 4.5mA and the ordinary IR through R1 and R2 is elected to be 0.25mA what values conclusion ce quiescent levels IQ and PDQ pretentious VS = VL(max)?

    d)If the ability provide is VS = ±15V what is VL(worst) and PD(worst, tot) ce the tour ?

    e) Ce part (d) what is the PS at VL = VL(max) and the competency?

    *ゆく +VE R3 bl36 01 03 VL 05 R1 04 Vin R4

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