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Output ResistanceAuthor: Leonard Krugman Fig. 313. Analysis of output resistance r_{o}: (A) equivalent circuit The output resistance can be found in a similar manner. Consider Fig. 313 (A), which illustrates the equivalent circuit for analyzing the output resistance. The equations for the two loops on the basis of Kirchoff's law are:
Solving the two independent equations 314 and 315A for the unknown load current,
Looking back into the transistor, the generator E_{2} with its internal resistance R_{L} sees the output resistance r_{0}. Again the circuit may be simplified as shown in Fig. 313 (B). Fig. 313 (B) simplified circuit. Then
Substituting equation 316 in 317,
Then
In terms of the opencircuit parameters
Fig. 314. Output resistance vs generator resistance for typical pointcontact transistor (grounded base). Fig. 315. Output resistance vs generator resistance for typical junction transistor (grounded base).


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