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Caracteristica statica (continuare)

Caracteristica statica (continuare). -. +. n. p. -. +. -. +. -. +. l 0. I A. I A. Φ B0. A. C. p. n. V A =0 (echilibru termic). “F”. V A. 0. (0,6…0,7)V. V A. “R”. I 0. ≈V A. Ipoteza de baza. 3.3.4. Efecte la curenti mari (rezistente serie). -. -. +. +. n. p. -.

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Caracteristica statica (continuare)

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  1. Caracteristica statica (continuare) - + n p - + - + - + l0 IA IA ΦB0 A C p n VA=0 (echilibru termic) “F” VA 0 (0,6…0,7)V VA “R” I0

  2. ≈VA Ipoteza de baza 3.3.4. Efecte la curenti mari (rezistente serie) - - + + n p - - + + - - + + - - + + l VA u ξ0 ξ=ξ0-ξA ξA ΦB0+VR ΦB= ΦB0-VA ΦB0 ΦB0-VF -lp -lp0 0 ln0 ln x VA<0 l>l0 VA>0 l<l0

  3. VJ Efectul rezistentelor serie Rs=Rsp+Rsn p - - n A + C + - - + + Rsn Rsp - - + + - - + + - - VA Rs VJ IA Ex: Rs=0,1Ω VA IA=-1 nA RsIA=-0,1nV IA=1mA RsIA=0,1mV IA=1A RsIA=0,1V(!)

  4. lnIA-VJ Curenti inversi Curenti directi mici VA≈VJ Curenti mari VA=VJ+RSIA VA≈VJ

  5. 3.3.5. Efecte la tensiuni inverse mari. Strapungerea jonctiunii pn IA VBR VR<0,6VBR VR VA 0 I0 VR>0,6VBR IR M VR->VBR

  6. Fenomene fizice la strapungere a) Multiplicarea purtatorilor de sarcina prin ciocnire - n + p b) Multiplicarea purtatorilor de sarcina prin ionizare (efect electrostatic) Si

  7. 3.3.6. Dependenta de temperatura a caracteristicii statice IA T2>T1 T2 T1 VA T1 T2 Polarizare inversa VR T1 T3>T2>T1 T2 T3 IR Polarizare directa IF=const T3 T1

  8. 3.4. Regimul dinamic al jonctiunii pn Metoda circuitului echivalent -forma semnalului -viteza de variatie p n iA(t) vA(t) Semnal mic + - va(t)=Vasin(ωt) vA(t) VA Va – f. mic

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