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 junction superbeta transistors (also named the Sziklai topology). *?? +VE R3 bl36 01 03 VL 05 R1 04 Vin R4

    Postulate PL(max) = 20W driving an RL = 4.5? enjoin. Also postulate equal interrelation in the drag and drag-down transistor so that beta 1 = beta 2 = 25 and beta 3 = beta 4 = 40. Postulate that R3, R4 delight 25% of the exoteric loose from the deep nodes of the Q1, Q2 drive transistors (R3 , R4 extension the ON-OFF urge).

    Determine:

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

    b) beta S control each junction transistor two.

    c)If Ibias = 4.5mA and the exoteric IR through R1 and R2 is elected to be 0.25mA what values end control immovable levels IQ and PDQ gorgeous VS = VL(max)?

    d)If the government give is VS = ±15V what is VL(worst) and PD(worst, tot) control the tour ?

    e) Control part-among-among (d) what is the PS at VL = VL(max) and the teachableness?

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

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