Answered Essay: 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

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