Lecture%205.pdf - Lecture 5 ANNOUNCEMENTS HW1 will be...

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Lecture 5 OUTLINE ANNOUNCEMENTS HW1 will be considered as extra credit. HW3 is posted, due Tuesday 9/18 EE105 Fall 2007 Lecture 5, Slide 1 Prof. Liu, UC Berkeley BJT (cont’d) Transconductance Small-signal model The Early effect BJT operation in saturation mode Reading: Chapter 4.4.3-4.5
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Transconductance, g m The transconductance ( g m ) of a transistor is a measure of how well it converts a voltage signal into a current signal. It will be shown later that g m is one of the most important parameters in integrated circuit design. EE105 Fall 2007 Lecture 5, Slide 2 Prof. Liu, UC Berkeley T C m T BE S T m T BE S BE BE C m V I g V V I V g V V I dV d dV dI g = = exp 1 exp
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Visualization of Transconductance g m can be visualized as the slope of the I C vs.V BE curve. The slope (hence g m ) increases with I C . EE105 Fall 2007 Lecture 5, Slide 3 Prof. Liu, UC Berkeley
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Transconductance and I C For a given V BE swing ( Δ V ), the resulting current swing about I C2 is larger than it is about I C1 . This is because g m is larger when V BE = V B2 .
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