ECE492 Section 2 Notes

Welcome! Notes for Spring 2022 Electronic Circuits course. Will make this more pretty as things evolve.

My goal is to make Electronic Circuits so easily digestible, you could teach a middle schooler. We'll see if this works.

Prologue

Hey how are you. I will insert something here later. :)

Section 2.1

We'll begin by covering a Bi-polar Junction Transistor, also known as BJT.

What is it exactly? Well, it's a transistor.

• It is a 3 terminal devices.
• It is a unsymmetrical device.
• It amplifies the signal.

There are two types of BJTs:

• NPN, in which...
• PNP, in which...

Now we'll cover (B) Common Emitter Current gain:

• $B={\frac {I_{c}}{I_{b}}}$
• 50 < B < 200

...and (Alpha) Common Base Current Gain:

• $Alpha={\frac {B}{B+1}}={\frac {I_{c}}{I_{e}}}$

V-I Characteristics of Transistors:

• AAAA

NPN Transistor Example:

• Cut Off: Both junction are reverse biased.
• Saturation: Both junction are forward biased.
• Active: One junction is forward biased, another one is reverse biased.

Header 2

It sometimes allow current, and sometimes it doesn't.

Assignment 1.1

We'll take this $x_{3}={\frac {9}{3}}$ and plug it into $2x_{2}+x_{3}=5$ to find x₂:

${\begin{aligned}2x_{2}+x_{3}=5\\x_{3}={\frac {9}{3}}\\{\text{Plug in }}x_{3}={\frac {9}{3}}{\text{ into }}2x_{2}+x_{3}=5{\text{:}}\\2x_{2}+{\frac {9}{3}}=5\\2x_{2}=2\\x_{2}=1\end{aligned}}$