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Sutitan
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Homework Statement
I don't understand how the website below got the equations for the output and input resistances
Homework Equations
http://www.statemaster.com/encyclopedia/Common-collector
The input resistance of a common collector circuit is the ratio of the change in input voltage to the resulting change in input current. The output resistance is the ratio of the change in output voltage to the resulting change in output current.
The input resistance can be calculated by dividing the emitter voltage by the change in emitter current. This can also be calculated by dividing the collector voltage by the change in collector current.
The input and output resistances are important because they determine the overall gain and stability of the circuit. A higher input resistance can result in a higher voltage gain, while a lower output resistance can provide a more stable output voltage.
The input and output resistances can affect the frequency response of a common collector circuit by acting as filters. A higher input resistance can result in a lower frequency response, while a lower output resistance can result in a higher frequency response.
Yes, the input and output resistances can be adjusted by changing the biasing resistors and the load resistance. By changing these resistances, the overall gain and stability of the circuit can be modified.