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Input ResistanceAuthor: Leonard Krugman
The input resistance of the grounded base transistor shown in Fig. 39 can now be computed in terms of the transistor parameters and the transistor fourterminal opencircuit parameters. Since the input resistance as seen by the signal generator is r_{1}, Fig 39 may be simplified as shown in Fig. 310. This series circuit is expressed E_{g} = i_{1}(R_{g} + r_{1}) or
Substituting equation 33 for i_{1}
then
and in terms ot the opencircuit parameters


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