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An´lisis del circuito
     a




                         Figura 1: Circuito propuesto

   β = 202, RB1 = 82kΩ, RB2 = 10kΩ, RC = 5,1kΩ, RE = 510Ω, RL =
5,1kΩ, Rs = 51Ω, C1 = 10µF, C2 = 10µF, CE = 10µF, VBE = 0,7vV cc = 12V dc



Comenzamos con el an´lisis DC:
                    a

                  V cc ∗ RB2                  12 ∗ 10k
           V th =            ⇒ V th =                  ⇒ V th = 1,3v
                  RB1 + RB2                  82k + 10k
                  RB1 ∗ RB2                  10k ∗ 82k
            Rth =            ⇒ Rth =                   ⇒ Rth = 9kΩ
                  RB1 + RB2                  82k + 10k
   Ecuaci´n est´tica de entrada:
         o     a
                                                          V th−VBE
  V th = IB ∗ Rth + V BE + (β + 1)RE ∗ IB ⇒ IB =        Rth+(β+1)∗RE   ⇒ IB =
                           1,3−0,7
                                    ⇒ IB = 5,33µA
                        9k+(202+1)∗510
                          IC = βIB ⇒ IC = 1,07mA
   Ecuaci´n est´tica de salida:
         o     a

  V cc = IC ∗ RC + VCE + IE ∗ RE ⇒ V cc = IC (RC + RE ) + VCE ⇒ VCE =
   V cc − IC (RC + RE ) ⇒ VCE = 12 − 1,07m ∗ (5,1k + 501) ⇒ VCE = 5,9v

   PUNTO Q
IB = 5,33µA, IC = 1,07mA, VCE = 5,9v




                                         1
Figura 2: Equivalente DC


  An´lisis AC
    a


          26mv              26mv
  hie =    IB    ⇒ hie =   11,55µA   ⇒ hie = 2,25k




                             Figura 3: Equivalente AC

  C´lculo de la recta din´mica:
   a                     a

                     RC RL           5,1k5,1k
           Rdin =   RC +RL ⇒ Rdin = 5,1k+5,1k ⇒ Rdin = 2,55x103
                     M din = Rdin ⇒ M din = 392,1x10−6
                              1
                                                        −6
       x2 = IC +VCE ∗M din ⇒ x2 = 1,07m+5,9∗392,1x10 ⇒ x2 = 8,62
                 M din                 392,1x10−6
y2c = M din ∗ (VCE + IC ) ⇒ y2c = 392,1x10−6 ∗ (5,9 + 1,07m) ⇒ 2,31x10−3



                                          2
RB1 RB2                        82k∗10k
                      hie∗ R                       2,25k∗ 82k+10k
                            B1 +RB2
           Zi =            R    R         ⇒ Zi =          82k∗10k
                                                   2,25k+ 82k+10k
                                                                     ⇒ Zi = 1,79kΩ
                      hie+ R B1 B2
                            B1 +RB2        “             ”
           RB2 RB1                               R   R
        Ii R                             IB hie+ R B1 B2
                                                    +R                  11,55µ(2,25k+ 82k+10k )
                                                                                      82k∗10k
            B2 +RB1
IB =         R    R       ⇒ Ii =                  B1
                                             RB2 RB1
                                                      B2
                                                              ⇒ Ii =             82k∗10k          ⇒
       hie+ R B1 B2                                                              82k+10k
              B1 +RB2                        RB2 +RB1
                                             Ii = 6,67µA
                       β∗IB ∗RC                 202∗5,33µ∗5,1k
                Io =    RC +RL      ⇒ Io =        5,1k+5,1k      ⇒ Io = 538,3µA

                                    Io             538,3µ
                          AI =      Ii   ⇒ AI =     6,67µ   ⇒ AI = 80,7

   Vi = Ii ∗ Rs + IB ∗ hie ⇒ Vi = 6,67µ ∗ 50 + 5,33µ2,25k ⇒ 12,3mV
                      βIB RC RL                202∗5,33µ∗5,1k∗5,1k
               Vo =    RC +RL       ⇒ Vo =          5,1k+5,1k          ⇒ Vo = 2,74v

                               Vo                 2,74
                       Av =    Vi   ⇒ Av =       12,71m    ⇒ Av = 216V /V
              β∗RC ∗RL                                     202∗5,1k∗5,1k
               RC +RL                                        5,1k+5,1k
Av1 =      RB1 ∗RB2
                    +hie
                                     ⇒ Av1 =            82k∗10k +2,25k          ⇒ Av1 = 222V /V
           RB1 +RB2                                     82k+10k
        Rs               +hie                      51      82k∗10k     +2,25k
             RB1 ∗RB2                                      82k+10k
            RB1 +RB2




                                         Figura 4: Simulaci´n
                                                           o

 Simulaci´n para una sen˜l sim´trica de 26mV.
         o              a     e




                                                   3

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Analisis Bjt 2n2222

  • 1. An´lisis del circuito a Figura 1: Circuito propuesto β = 202, RB1 = 82kΩ, RB2 = 10kΩ, RC = 5,1kΩ, RE = 510Ω, RL = 5,1kΩ, Rs = 51Ω, C1 = 10µF, C2 = 10µF, CE = 10µF, VBE = 0,7vV cc = 12V dc Comenzamos con el an´lisis DC: a V cc ∗ RB2 12 ∗ 10k V th = ⇒ V th = ⇒ V th = 1,3v RB1 + RB2 82k + 10k RB1 ∗ RB2 10k ∗ 82k Rth = ⇒ Rth = ⇒ Rth = 9kΩ RB1 + RB2 82k + 10k Ecuaci´n est´tica de entrada: o a V th−VBE V th = IB ∗ Rth + V BE + (β + 1)RE ∗ IB ⇒ IB = Rth+(β+1)∗RE ⇒ IB = 1,3−0,7 ⇒ IB = 5,33µA 9k+(202+1)∗510 IC = βIB ⇒ IC = 1,07mA Ecuaci´n est´tica de salida: o a V cc = IC ∗ RC + VCE + IE ∗ RE ⇒ V cc = IC (RC + RE ) + VCE ⇒ VCE = V cc − IC (RC + RE ) ⇒ VCE = 12 − 1,07m ∗ (5,1k + 501) ⇒ VCE = 5,9v PUNTO Q IB = 5,33µA, IC = 1,07mA, VCE = 5,9v 1
  • 2. Figura 2: Equivalente DC An´lisis AC a 26mv 26mv hie = IB ⇒ hie = 11,55µA ⇒ hie = 2,25k Figura 3: Equivalente AC C´lculo de la recta din´mica: a a RC RL 5,1k5,1k Rdin = RC +RL ⇒ Rdin = 5,1k+5,1k ⇒ Rdin = 2,55x103 M din = Rdin ⇒ M din = 392,1x10−6 1 −6 x2 = IC +VCE ∗M din ⇒ x2 = 1,07m+5,9∗392,1x10 ⇒ x2 = 8,62 M din 392,1x10−6 y2c = M din ∗ (VCE + IC ) ⇒ y2c = 392,1x10−6 ∗ (5,9 + 1,07m) ⇒ 2,31x10−3 2
  • 3. RB1 RB2 82k∗10k hie∗ R 2,25k∗ 82k+10k B1 +RB2 Zi = R R ⇒ Zi = 82k∗10k 2,25k+ 82k+10k ⇒ Zi = 1,79kΩ hie+ R B1 B2 B1 +RB2 “ ” RB2 RB1 R R Ii R IB hie+ R B1 B2 +R 11,55µ(2,25k+ 82k+10k ) 82k∗10k B2 +RB1 IB = R R ⇒ Ii = B1 RB2 RB1 B2 ⇒ Ii = 82k∗10k ⇒ hie+ R B1 B2 82k+10k B1 +RB2 RB2 +RB1 Ii = 6,67µA β∗IB ∗RC 202∗5,33µ∗5,1k Io = RC +RL ⇒ Io = 5,1k+5,1k ⇒ Io = 538,3µA Io 538,3µ AI = Ii ⇒ AI = 6,67µ ⇒ AI = 80,7 Vi = Ii ∗ Rs + IB ∗ hie ⇒ Vi = 6,67µ ∗ 50 + 5,33µ2,25k ⇒ 12,3mV βIB RC RL 202∗5,33µ∗5,1k∗5,1k Vo = RC +RL ⇒ Vo = 5,1k+5,1k ⇒ Vo = 2,74v Vo 2,74 Av = Vi ⇒ Av = 12,71m ⇒ Av = 216V /V β∗RC ∗RL 202∗5,1k∗5,1k RC +RL 5,1k+5,1k Av1 = RB1 ∗RB2 +hie ⇒ Av1 = 82k∗10k +2,25k ⇒ Av1 = 222V /V RB1 +RB2 82k+10k Rs +hie 51 82k∗10k +2,25k RB1 ∗RB2 82k+10k RB1 +RB2 Figura 4: Simulaci´n o Simulaci´n para una sen˜l sim´trica de 26mV. o a e 3