Small-Signal Parameters of Bipolar Transistors: Transconductance, Gain, Input and Output Impedance
Channel: IFE - TU Graz
Date: 2021-11-12

Transistors are non-linear components, therefore we cannot apply our usual tools for circuit analysis like the superposition principle to transistor circuits. If we still want to use these principles we have linearise the non-linear components of our circuits, e.g. transistors. In this video we therefore show how to linearise a transistor around its operating point. By that we derive formulas for the small-signal parameters of bipolar transistors, transconductance gm, small-signal current gain beta/β, small-signal input impedance/resistance rBE, small-signal output impedance/resistance rCE forming the small-signal equivalent circuit.

Tutor: Patrick Schrey

Chapters:
0:00 Intro
0:21 Linearisation
0:41 Small-Signal Parameters of Bipolar Transistors
0:54 Transconductance gm
1:40 Small-Signal Current Gain beta, β
1:52 Small-Signal Input Impedance rBE
2:17 Small-Signal Output Impedance rCE
2:38 Small-Signal Equivalent Circuit

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#electronics #transistors #microelectronics #semiconductors