BZU PAGES: Find Presentations, Reports, Student's Assignments and Daily Discussion; Bahauddin Zakariya University Multan Right Header

HOME BZU Mail Box Online Games Radio and TV Cricket All Albums
Go Back   BZU PAGES: Find Presentations, Reports, Student's Assignments and Daily Discussion; Bahauddin Zakariya University Multan > Institute of Computing > Bachelor of Science in Telecom System > BsTS 1st Semester > Electrical Circuits


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
  #1  
Old 19-03-2011, 08:01 PM
bonfire's Avatar
M.Arsalan Qureshi

 
Join Date: Oct 2008
Location: Garden Town, Multan Cantt
Posts: 616
Program / Discipline: BSTS
Class Roll Number: 09-31
bonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond repute
Default Chapter 3: Bipolar Junction Transistors

Chapter 3: Bipolar Junction Transistors

During 1904 to 1947, the vacuum tube was undoubtedly the electronic device of interest and development. In 1904, the vacuum-tube diode was introduced by J. A. Fleming. Shortly thereafter, in 1906, Lee De Forest added a third element, called the control grid, to the vacuum diode, resulting in the first amplifier, the triode. In the following years, radio and television provided great stimulation to the tube industry. Production rose from about 1 million tubes in 1922 to about 100 million in 1937. In the early 1930s the four-element tetrode and the five-element pentode gained prominence in the electron-tube industry. In the years to follow, the industry became one of primary importance, and rapid advances were made in design, manufacturing techniques, high-power and high-frequency applications, and miniaturization.



On December 23, 1947, however, the electronics industry was to experience the advent of a completely new direction of interest and development. It was on the afternoon of this day that Walter H. Brattain and John Bardeen demonstrated the amplifying action of the first transistor at the Bell Telephone Laboratories. The advantages of this three-terminal solid-state device over the tube were immediately obvious: It was smaller and lightweight; it had no heater requirement or heater loss; it had a rugged construction; it was more efficient since less power was absorbed by the device itself; it was instantly available for use, requiring no warm-up period; and lower operating voltages were possible. Note that this chapter is our first discussion of devices with three or more terminals. You will find that all amplifiers (devices that increase the voltage, current, or power level) have at least three terminals, with one controlling the flow between the other two.
__________________

Reply With Quote
Reply

Tags
bipolar, chapter, junction, transistors


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
chapter#3:Buses hurain07 Computer Architecture 0 08-07-2011 07:31 PM
Chapter 8: FET Amplifiers bonfire Electrical Circuits 0 19-03-2011 08:05 PM
Chapter 6: Field-Effect Transistors bonfire Electrical Circuits 0 19-03-2011 08:04 PM
Chapter 5: BJT AC Analysis bonfire Electrical Circuits 0 19-03-2011 08:03 PM
Redhat Book:linux chapter 1 to chapter 22 (Complete Tutorial) taha khan System Admin 0 09-05-2010 01:58 AM

Best view in Firefox
Almuslimeen.info | BZU Multan | Dedicated server hosting
Note: All trademarks and copyrights held by respective owners. We will take action against any copyright violation if it is proved to us.

All times are GMT +5. The time now is 04:21 PM.
Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.