All About Circuits Forum  

Go Back   All About Circuits Forum > Electronics Forums > Homework Help


Homework Help Stuck on a textbook question or coursework? Cramming for a test and need help understanding something? Post your questions and attempts here and let others help.

Reply   Post New Thread
Thread Tools Display Modes
Old 10-13-2011, 08:38 AM
Digit0001 Digit0001 is offline
Join Date: Mar 2010
Posts: 89
Default BJT AC Analysis Problem


Can someone explain to me how they got part c) finding the small signal; voltage gain in the following document.

This is the AC equivalent circuit i used.

Reply With Quote
Old 10-13-2011, 12:28 PM
Georacer's Avatar
Georacer Georacer is offline
Super Moderator
Join Date: Nov 2009
Location: Athens, Greece (GMT +2)
Posts: 4,875

Please don't upload .doc or .docx formats. If a simple .png image isn't enough, use the .pdf at least.

Many members are reluctant to use the .doc format.
Attached Files
File Type: pdf ques5_tut4.pdf (175.4 KB, 16 views)
I am a prisoner of high standards and low social skills

I wish I was the best at what I would do, and what I would do wouldn't be pretty.
Reply With Quote
Old 10-13-2011, 11:54 PM
t_n_k t_n_k is offline
Senior Member
Join Date: Mar 2009
Posts: 4,956

Personally I think the solution to part (c) is overcomplicated.

Since it is required to find Vo/Vs, I would simply assume a voltage source of value Vs is applied to the emitter.

From there one can observe that


Given that, one can then determine the output as a function of vs since


or Av=6.744 [which seems a better estimate to me than 6.73]
Reply With Quote
Reply   Post New Thread

, ,

Related Site Pages
Section Title
Worksheet Digital display circuits
Worksheet Thyristor application circuits
Worksheet Multi-stage transistor amplifiers
Worksheet JFET amplifiers
Worksheet Junction field-effect transistors
Worksheet Class A BJT amplifiers
Worksheet Bipolar junction transistors in active mode
Worksheet Bipolar junction transistors as switches
Worksheet Bipolar junction transistor theory
Textbook The cascode amplifier : Bipolar Junction Transistors

Similar Threads
Thread Thread Starter Forum Replies Last Post
pspice netlist ac analysis The Projects Forum 7 04-14-2011 12:20 AM
que about Ac analysis nathalie General Electronics Chat 3 03-26-2011 01:36 PM
BJT Small-signal analysis: why does Vcc appear as earth to AC signals? Mango Symphony Homework Help 6 03-03-2011 09:40 PM
Mesh Current Analysis Problem Help crazyengineer Homework Help 7 12-31-2010 04:25 PM
Need help with this mesh/nodal analysis problem mesaman000 Homework Help 4 06-30-2010 01:20 AM

Thread Tools
Display Modes

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

Forum Jump

All times are GMT. The time now is 01:23 PM.

User-posted content, unless source quoted, is licensed under a Creative Commons Public Domain License.
Powered by vBulletin
Copyright ©2000 - 2014, vBulletin Solutions, Inc.