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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
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