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Common-Source Amplifier Analysis

This document contains 5 problems related to analyzing common-source, common-drain, and common-gate amplifier circuits. The problems provide circuit diagrams and component values and ask the reader to calculate various circuit parameters such as input resistance, output resistance, voltage gains, and other values. The document is signed off by Dr. Eman F. Sawires from Helwan University's Computer and Systems Engineering department.

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103 views3 pages

Common-Source Amplifier Analysis

This document contains 5 problems related to analyzing common-source, common-drain, and common-gate amplifier circuits. The problems provide circuit diagrams and component values and ask the reader to calculate various circuit parameters such as input resistance, output resistance, voltage gains, and other values. The document is signed off by Dr. Eman F. Sawires from Helwan University's Computer and Systems Engineering department.

Uploaded by

ABDO
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Helwan University Sheet (1)

Basic Electronics 1St year


Dr. Eman F. Sawires Com. & Sys Eng. Dept.

1. For the common-source amplifier shown in Fig. 1; R1 =10MΩ, R2 =10MΩ, RD =6KΩ,


𝑊
RS =6KΩ, RL =10KΩ, RSig =100KΩ, VDD =10V, VA =50V, VT= 1V and 𝐾′ ( )
𝐿
=1mA/V2. Find ID, VDS, VGS, gm, input resistance Ri, output resistance Ro, Avo, Av and the
overall voltage gain Gv (vo/ vs).

Fig. 1
2. The NMOS transistor in the CS amplifier circuit of Fig. 2 is biased to have gm = 1 mA/𝑉
and ro = 100 kΩ. Find the overall voltage gain, input resistance, and output resistance.

10V

6KΩ

10MΩ

100KΩ 𝐿
10KΩ

10MΩ 6KΩ

Fig. 2
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3. In Fig. 3, a CS amplifier has I = 5 mA, RG = 10 MΩ, Rsig = 100 kΩ, RD = RL = 10 kΩ.
Find the values of Rin, Ro, and the overall voltage gain (vo/ vsig). Given, 𝜇𝑛 𝑥 = 0.1
mA/V2, W/L = 4, VA=100V.

Fig. 3

4. In Fig. 4, a CD amplifier has gm = 1 mA/V and ro = 150 KΩ. Let Rsig = 1 MΩ, RG = 4.7
MΩ, and RL = 15KΩ. Find Rin, Ro, the voltage gain (vo/ vi), and the overall voltage gain
(vo/ vsig) without and with ro taken into account.

Fig. 4

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5. In Fig. 5, a CG amplifier has I = 0.5 mA, RD= 15KΩ, RL= 15KΩ, Rsig = 50 Ω. Find the
values of Rin, Ro, AVO, AV, GV. Given 𝐾𝑛′ (W/L) = 1 mA/V2.

Fig. 5

Best Wishes Dr. Eman F. Sawires


…………………….End …………………….

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