1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Simple transistor problem (emitter follower)

  1. Mar 30, 2009 #1
    1. The problem statement, all variables and given/known data
    the question can be found here: http://www.mailfreeonline.com/uploader/04AEED12.jpg [Broken]
    i'm having issues with parts (a) and (d). the rest i think i've done correctly, but it would be helpful if someone could verify my answers.

    2. Relevant equations

    3. The attempt at a solution

    (a) my guess is that the capacitors are there to filter out low-frequency components, and that the 2 resistors are there for biasing purposes. why it would be better to have the second as well as the first, i have no idea.

    (b) i got R1 = 43 kO, R2 = 57 kO and R_E = 4.95 kO, but i don't understand why the current flowing through the 2 resistors has to be at least 1 order of magnitude bigger than I_b.

    (c) i got my gain to be 1

    (d) it has a very high input impedence and could be used as a buffer, right?

    again, it's mainly parts (a) and (d) that i need help with. the rest just needs a little verification. thanks in advance
    Last edited by a moderator: May 4, 2017
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted