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The Hybrid Pi and T Models lecture - KU ITTC

3/30/2011 The Hybrid Pi and T Models lecture 1/6 Jim Stiles The Univ. of Kansas Dept. of EECS The Hybrid - and T Models Consider again the small-small signal equations for an npn BJT biased in the active mode: ()bcmbebebcbe iigv iiiivKCLr====+ Now, analyze this circuit: + vbe - r mbebgv i= bi ci ei 3/30/2011 The Hybrid Pi and T Models lecture 2/6 Jim Stiles The Univ. of Kansas Dept. of EECS Do these equations look familiar? From Ohm s Law: bbe ivr= From KCL: cmbe bigv i== And also from KCL: ()ebciiiKCL=+ Q: Hey! Aren t these the same three equations as the npn BJT small-signal equations?

3/30/2011 The Hybrid Pi and T Models lecture 3/6 Jim Stiles The Univ. of Kansas Dept. of EECS Two equivalent circuits Thus, this circuit can be used as an equivalent circuit for BJT small-signal analysis (but only for small signal analysis!). This equivalent circuit is

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