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BJT - Model

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BJT - Model

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BJT - Model

  1. 1. BJT – Model Yong Heui Cho @ Mokwon University Some of slides are referred to: [1] A. S. Sedra & K. C. Smith, Microelectronic Circuits.
  2. 2. 2 Electronic Circuits 7. Diode – Advanced Applications 8. BJT – Operational Principle 9. BJT – Model 10. BJT – Analysis of Bias
  3. 3. 3 Active Condition • Collector Current(IC) = about mA • CE Voltage(VCE) = VCC/2
  4. 4. 4 NPN TR as Switch • NOT gate in digital circuit
  5. 5. 5 PNP TR as Switch
  6. 6. 6 iD = 0, vD ≤ VD0 iD = (vD - VD0) / rD , vD ≥ VD0 Diode Model • Piecewise Linear Model – B-E junction in BJT
  7. 7. 7 BJT Model • Diode model: B-E junction • Dependent current source: B-C junction
  8. 8. 8 Simple Ebers-Moll Model
  9. 9. 9 Final Model Ebers-Moll Model at saturation Mode
  10. 10. 10 saturation mode cutoff mode Saturation Mode • Active, cutoff, and saturation modes • Small R region, full of carriers active mode I-V curve

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