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Biasing Analysis and BJT SPICE Model in Electronics - Prof. Aurangzeb Khan, Study notes of Electrical and Electronics Engineering

University of South Alabama (USA)Electrical and Electronics Engineering

Prof. Aurangzeb Khan

An analysis of worst-case values for ic and vce in a bjt (bipolar junction transistor) circuit, including the impact of tolerances on resistors and voltage sources. It also introduces the bjt spice model and its typical values for various components.

Typology: Study notes

Pre 2010

Uploaded on 08/17/2009

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Download Biasing Analysis and BJT SPICE Model in Electronics - Prof. Aurangzeb Khan and more Study notes Electrical and Electronics Engineering in PDF only on Docsity! 1 The process by which the quiescent output voltage is caused to fall somewhere the cutoff and saturated values is referred to as biasing. Example 3.13 Q-point has shifted Substantially. Q-point is not stabilized Against the variation β. Direct-Current Equivalent [vorage divider + [Stabilizing resistor Thévenin Equivalent of Base BIT Bias Stability Vin = Rrnlga * Vegion) *leaRe "Vin = Rraleo *Vee(on) *(B+ IilsRe bog = pW Vationy 00 Rin (B+ DRE leo = BM In7 Masion) co = Rn + B+ DRE For Bias Stability: Rp, << (1 +B) Re For Bias Stability: Rry << (1 +B) Re Ejon)) (B+ DRE If >> 1, then Bi(1 +B) ~ 1 Therefore,

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Biasing Analysis and BJT SPICE Model in Electronics - Prof. Aurangzeb Khan, Study notes of Electrical and Electronics Engineering

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