figs07

figs07 - FIGURES FOR CHAPTER 7 V A RS C V V ID Figure 7-1...

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F IGURES FOR C HAPTER 7 Figure 7-1 Large-scale diode model. R S C I D V A V V
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Table 7-1 Diode model parameters and their corresponding SPICE parameters Symbol SPICE Description Typical values I S IS saturation current 1 fA–10 μ A n N emission coefficient 1 τ T TT transit time 5 ps–500 μ s R S RS ohmic resistance 0.1–20 V diff VJ barrier voltage 0.6–0.8 V ( pn ) 0.5–0.6 V (Schottky) C J 0 CJ0 zero-bias junction capacitance 5–50 pF ( pn ) 0.2–5 pF (Schottky) m M grading coefficient 0.2–0.5 W g EG bandgap energy 1.11 eV (Si) 0.69 eV (Si-Schottky) p t XTI saturation current temperature coefficient 3 ( pn ) 2 (Schottky)
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(a) tangent approximation at Q- point (b) linear circuit model. Figure 7-2 Small-signal diode model. R S R ( V dQ ) C ( V ) V I D V= V AA Q I= I DQ V A I D
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Table 7-2 Diode model parameters for different temperatures T , °K 250 300 350 400 W g ( T ), eV 1.128 1.115 1.101 1.086 I s ( T ), A 5.1 × 10 –19 5.0 × 10 –15 3.3 × 10 –12 3.8 × 10 –10 V Q , V 0.979 0.898 0.821 0.748 R d , 0.5 0.6 0.7 0.8 C d , pF 999.5 832.9 713.9 624.7
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Figure 7-3 Frequency behavior of the diode impedance for different junction temperatures. 10 100 1000 Frequency , MHz f 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 Impedance | |, Z 250 ° K 300 ° K 350 ° K 400 ° K
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(a) Voltage and current convention for npn transistor (b) Ebers-Moll circuit model Figure 7-4 Large-signal Ebers-Moll circuit model. I B I C V BE V CE B EE C I B I C I F I R α RR I α FF I V BE V
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(a) Forward active mode (b) Reverse active mode Figure 7-5 Simplified Ebers-Moll equations for forward and reverse active modes. B EE C I R α R R I V BE V CE B E E C I F a F F I V BE V CE
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(a) Dynamic Ebers-Moll chip model (b) RF model with parasitic terminal effects Figure 7-6 Dynamic Ebers-Moll model and parasitic element refinements. R BB I F B B C C E E ' I R α RR I α FF I R CC R EE C dc C jc C de C je Ebers-Moll model R BL B E C C be bc R CL R EL C ce L BL L CL L EL Ebers-Moll model
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Figure 7-7 Transport representation of static Ebers-Moll injection model.
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This note was uploaded on 01/31/2012 for the course EE 4002 taught by Professor Scalzo during the Fall '06 term at LSU.

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figs07 - FIGURES FOR CHAPTER 7 V A RS C V V ID Figure 7-1...

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