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1 kHz Vi iR₁ H +12V R₁ VI Q₁ DI -12V D: +12V Q₂ R₂ Q₁ Qo R₁ 0.47 Ω Vcc-v₁-VD₁+UBE₁ R₁ R4 0.47 Q Q. -12V Figure 2 Darlington pair Class AB amplifier Vou The improved power amplifier (Figure 2) uses a Darlington pair configuration to increase the gain of the output transistors. Each Darlington pair can be approximately modelled as a single transistor with double the base-emitter voltage (2x VBE), and squared of the gain (6²). -12V The diodes D, and D2 provide the extra voltage drop required to keep the Darlington pairs active. For the diodes, the current-voltage relationship is given by ID = Isevr. i BQ3 RL 8.20 icq3 BXB (5)

1 kHz Vi iR₁ H +12V R₁ VI Q₁ DI -12V D: +12V Q₂ R₂ Q₁ Qo R₁ 0.47 Ω Vcc-v₁-VD₁+UBE₁ R₁ R4 0.47 Q Q. -12V Figure 2 Darlington pair Class AB amplifier Vou The improved power amplifier (Figure 2) uses a Darlington pair configuration to increase the gain of the output transistors. Each Darlington pair can be approximately modelled as a single transistor with double the base-emitter voltage (2x VBE), and squared of the gain (6²). -12V The diodes D, and D2 provide the extra voltage drop required to keep the Darlington pairs active. For the diodes, the current-voltage relationship is given by ID = Isevr. i BQ3 RL 8.20 icq3 BXB (5)

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Please show me the derivation of euqation 5 and the one below it. Please do it with a reasonable assumption 

1 kHz Vin iR₁ +12V R₁ VI Q₁ DI -12V D: +12V R2 Q₁ Qo V₂ Q3 R 3 0.47 Ω R4 0.47 Ω Q4 C₂ #H -12V Figure 2 Darlington pair Class AB amplifier Vout -12V The improved power amplifier (Figure 2) uses a Darlington pair configuration to increase the gain of the output transistors. Each Darlington pair can be approximately modelled as a single transistor with double the base-emitter voltage (2x VBE), and squared of the gain (6²). Vcc-₁-UD₁+UBE₁ > i BQ31 R₁ RL 8.2 Ω The diodes D, and D2 provide the extra voltage drop required to keep the Darlington pairs active. For the diodes, the current-voltage relationship is given by ID = Isevr. icq3 BXB (5)
Transcribed Image Text:1 kHz Vin iR₁ +12V R₁ VI Q₁ DI -12V D: +12V R2 Q₁ Qo V₂ Q3 R 3 0.47 Ω R4 0.47 Ω Q4 C₂ #H -12V Figure 2 Darlington pair Class AB amplifier Vout -12V The improved power amplifier (Figure 2) uses a Darlington pair configuration to increase the gain of the output transistors. Each Darlington pair can be approximately modelled as a single transistor with double the base-emitter voltage (2x VBE), and squared of the gain (6²). Vcc-₁-UD₁+UBE₁ > i BQ31 R₁ RL 8.2 Ω The diodes D, and D2 provide the extra voltage drop required to keep the Darlington pairs active. For the diodes, the current-voltage relationship is given by ID = Isevr. icq3 BXB (5)
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