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# Introduction to Electronics - PHYS2211 Fall Semester 2015

Question # 00157550
Subject: Engineering
Due on: 01/22/2016
Posted On: 12/23/2015 01:55 AM

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Introduction to Electronics - PHYS2211
Fall Semester 2015

Assignment #4
Due date: December 9th, 2015
1. For Figure 1:
a. Draw the DC equivalent circuit and the AC equivalent circuit for the unloaded
amplifier.
b. Determine the Rin(base), Rin(tot) and AV values.
c. Connect a bypass capacitor across RE and repeat step (b).
d. Connect a 10 kΩ load resistor to the output and repeat step (b).

Figure 1

2. Assume that a 600 Ω, 12 μV rms voltage source is driving the amplifier in Figure 2.
Determine the overall voltage gain by taking into account the attenuation in the base
circuit, and find the total output voltage (AC and DC). What is the phase relationship of
the collector signal voltage to the base signal voltage?

Figure 2

The American University in Cairo - School of Sciences and Engineering – Department of Physics

3. For Figure 3:
a. Determine the exact voltage gain for the unloaded emitter-follower.
b. What is the total input resistance? What is the DC output voltage?
c. A load resistance, is capacitively coupled to the emitter. In terms of signal
operation, the load appears in parallel with RE and reduces the effective emitter
resistance. How does this affect the voltage gain?
d. In part (c), what value of RL will cause the voltage gain to drop to 0.9?

Figure 3

The American University in Cairo - School of Sciences and Engineering – Department of Physics
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#### Introduction to Electronics - PHYS2211 Fall Semester 2015

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Posted On: 12/23/2015 01:55 AM
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Tutorial Preview …Figure xxx Draw xxx DC equivalent xxxxxxx and the xx equivalent xxxxxxx xxx the xxxxxxxxxxxxxxxxx b Determine xxx Rin(base), Rin(tot) xxx AV xxxxxx x Connect x bypass capacitor xxxxxx RE and xxxxxx step xxx x Connect x 10 kΩ xxxx resistor to xxx output xxx xxxxxx…
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