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Simple transistor problem (emitter follower)

  • Thread starter ABoul
  • Start date
28
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1. Homework Statement
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. Homework 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
 
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