QUESTION 20: The output stage in the following Figure is a Darlington

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QUESTION 20: The output stage in the following Figure is a Darlington pair emitter-follower configuration. Assume β = 230 for all npn transistors and β = 80 for all pnp transistors. Let VA7 = 85 V for Q7, VA11 = 192 V for Q11, and VA = ∞ for all other transistors. Calculate the small-signal resistance looking into the emitters of Q9 and Q8, i.e. Re9 and Re8, respectively. Hence, determine the output resistance R0. Re9 (kΩ) Re8 (Ω) Format : 8.23 RO (Ω) Format : 33.37 Format : 8.23 Re8 (Ω) Format: 33.37 RO (Ω) Format : 88.45

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QUESTION 20: The output stage in the following Figure is a Darlington pair emitter-follower configuration. Assume

β = 230

for all npn transistors and

β = 80

for all pnp transistors.

Let

V_{A 7} = 85 V

for

Q_{7}, V_{A 11} = 192 V

for

Q_{11}

, and

V_{A} = \infty

for all other transistors. Calculate the small-signal resistance looking into the emitters of

Q_{9}

and

Q_{8}

, i.e.

R_{e 9}

and

R_{e 8}

, respectively.

Hence, determine the output resistance

R_{0}

.

\begin{array}{lll} R_{e 9} (k Ω) \\ R_{e 8} (Ω) & ◻ & Format : 8.23 \\ R_{0} (Ω) & ◻ \\ Format : 33.37 \end{array}

Format : 8.23

R_{e 8} (Ω)

Format: 33.37

R_{0} (Ω)

Format : 88.45

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