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Input and Output Resistance (Electronics)

  1. Oct 6, 2005 #1
    R_out
    |-------------***------------o------------------|
    |.........................................+........................|
    |.................................V_signal.......................* R_in
    -..V_out, perfect.............................................*
    -...................................................................|
    |...................................................................|
    |.........................................-.........................|
    |-----------------------------o------------------|
    =.......(ground)................................................=

    Say that circuit 1 is the left side of the above circuit (ignore the dots), and circuit 2 is the right side (R_in).

    First I have to find V_signal using kirchoff rules
    so I get V_signal -R_out - V_out, perfect - R_n = 0

    But I am not sure what happens with R_in >> R_out, R_in << R_out or when R_in = R_out.
     
  2. jcsd
  3. Oct 6, 2005 #2

    Tom Mattson

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    Staff Emeritus
    Science Advisor
    Gold Member

    I can't make heads or tails of your equation.

    Do you mean this?

    [tex]V_{signal}-R_{out}-V_{out,perfect}-R_n=0[/tex]

    That's what it looks like, but if that is in fact the equation that it makes no sense. You're subtracting voltages and resistances, which have totally different units.
     
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