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Negative Feedback.

Discussion in 'General Electronics Discussion' started by MstrKurt, Jan 30, 2013.

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  1. MstrKurt


    Jun 13, 2011
    Hey guys I'm working through a Circuit Design example and I've come across the equation:

    CB >= 1/ (2piFO(Rg+Rin))

    But I have no idea what Rg is... Can somebody help?.
  2. DuctDuck


    Jan 26, 2013
    Well, with so little content I would guess it to be for selecting a feedback capacitor in a higher order low pass amplifier. Rg could be signal generator's resistance or gate's resistance or...

    If Rin is larger than anything you think Rg is, ignore it and see what you get!
  3. MstrKurt


    Jun 13, 2011
    I have an exam in 4 hours, and I know nothing :(. I have handouts etc but they're not very clear in designing each amplifier (series feedback, split emitter and common emitter)

    Can anybody help me get ready in 4 hours? I know this is a lot to ask.
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Yes, I can help.

    Go back in time and do all the suggested study.
  5. MstrKurt


    Jun 13, 2011
    Don't assume I'm a lazy student who doesn't do his work.

    The past 2 weeks I have been revising for a maths exam, and then found out that I have this exam within a day of my Math exam...

    I'm asking for some help because I've been revising solid for 15 hours and can only gather some information as I have broken handouts..
  6. davenn

    davenn Moderator

    Sep 5, 2009
    No, not at all :)

    BUT there must be somewhere in your course notes, tutorial papers etc a reference to this if it is a topic covered during the course :)

    Like Ductduck, with little other info, I have no real idea what it is referring to

  7. MstrKurt


    Jun 13, 2011
    I found out that Rg is signal source impedance.

    Can anybody tell me the difference between designing an amplifier offload/onload?

    While also saying where the calculations change?.
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