Bipolar Junction Transistor AC Analysis Insights
Explore the AC analysis of Bipolar Junction Transistors, including hybrid equivalent circuits for various configurations like CE Fixed-Bias and CE Voltage-Divider. Gain valuable knowledge from recommended readings and approximate models.
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Presentation Transcript
Sources & Required Reading ROBERT BOYLESTAD & LOUIS NASHELSKY, ELECTRONIC DEVICES AND CIRCUIT THEORY, 7th edition 2
Approximate Hybrid Equivalent Circuit The h-parameters can be derived from the re model: hie = re hfe = hoe = 1/ro hib = re hfb = -
Hybrid Equivalent Circuit of CE Fixed-Bias Configuration Zi= B h || R ie 1 Impedances: (R Zo= R || C h = 1 oe h || ) Vo fe C h Gain: = oe Av Vi Io h ie = Ai h fe Ii
CE Voltage-Divider Configuration Impedances: = Zi R || h ie Zo R C 1 h (R || ) fe C h Gain: Av = oe h ie h + R fe = Ai R h ie
CE Unbypassed Emitter-Bias Configuration Gain: || R Impedances: R Zb Zi C feR h R B Zo= Av E R R fe + E B h = Zb = Ai R Zb B C
