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Input and Output Resistance (Electronics) 
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#1
Oct605, 05:58 PM

P: n/a

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
Oct605, 06:07 PM

Emeritus
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PF Gold
P: 5,534

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