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5. Compute the voltage gain and I/O imp dances of the circuits shown in Fig. 5.14 Assume V₁ = ∞0.

5. Compute the voltage gain and I/O imp dances of the circuits shown in Fig. 5.14 Assume V₁ = ∞0.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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**5.56.** Compute the voltage gain and I/O impedances of the circuits shown in Fig. 5.146. Assume \( V_A = \infty \). **Diagram Explanation:** - The diagram is a simple transistor amplifier circuit. - It uses two bipolar junction transistors, labeled \( Q_1 \) and \( Q_2 \). - The input voltage \( V_{in} \) is applied to the base of \( Q_1 \). - \( Q_1 \) is connected in a common-emitter configuration. - The collector of \( Q_1 \) is connected to \( V_{CC} \), a positive supply voltage. - The output voltage \( V_{out} \) is taken from the collector of \( Q_2 \). - \( Q_2 \) is configured as an emitter follower (common-collector configuration). - \( V_b \) is applied to the base of \( Q_2 \). - The emitter of \( Q_2 \) is connected to the ground. This setup is a typical two-stage amplifier configuration where the first stage provides voltage gain and the second stage provides buffering with low output impedance. The problem asks for the computation of voltage gain and input/output impedances for this configuration, assuming the Early voltage \( V_A \) is infinite, which implies certain simplifications in transistor modeling, especially neglecting the output conductance.
Transcribed Image Text:**5.56.** Compute the voltage gain and I/O impedances of the circuits shown in Fig. 5.146. Assume \( V_A = \infty \). **Diagram Explanation:** - The diagram is a simple transistor amplifier circuit. - It uses two bipolar junction transistors, labeled \( Q_1 \) and \( Q_2 \). - The input voltage \( V_{in} \) is applied to the base of \( Q_1 \). - \( Q_1 \) is connected in a common-emitter configuration. - The collector of \( Q_1 \) is connected to \( V_{CC} \), a positive supply voltage. - The output voltage \( V_{out} \) is taken from the collector of \( Q_2 \). - \( Q_2 \) is configured as an emitter follower (common-collector configuration). - \( V_b \) is applied to the base of \( Q_2 \). - The emitter of \( Q_2 \) is connected to the ground. This setup is a typical two-stage amplifier configuration where the first stage provides voltage gain and the second stage provides buffering with low output impedance. The problem asks for the computation of voltage gain and input/output impedances for this configuration, assuming the Early voltage \( V_A \) is infinite, which implies certain simplifications in transistor modeling, especially neglecting the output conductance.
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