Bien, tenemos el siguiente circuito:
simular este circuito : esquema creado con CircuitLab
Al analizar un transistor necesitamos usar las siguientes relaciones :
Cuando usamos y aplicamos KCL , podemos escribir el siguiente conjunto de ecuaciones:
Cuando usamos y aplicamos la ley de Ohm , podemos escribir el siguiente conjunto de ecuaciones:
Ahora, en tu circuito tenemos:
Debido a que usamos el dominio s 'complejo', también podemos escribir:
Ahora, usé Mathematica para resolver este (gran) problema. El código usado es:
FullSimplify[
Solve[{IE == IB + IC, \[Beta] == IC/IB, VBE == V2 - V3,
I3 == I1 + I2, 0 == I2 + I4 + I9, I5 == I9 + I10, IE == I4 + I5,
I1 + I8 == I3 + I11, I11 == IB + I6, IC == I6 + I7, I10 == I7 + I8,
I1 == (((Vin*s)/(s^2 + \[Omega]^2)) - V1)/R1,
I1 == (V1 - V2)/((1/(s*C1))), I3 == V2/R3, I4 == V3/R4,
I5 == V3/((1/(s*C2))), I6 == (V2 - V4)/((1/(s*C3))),
I7 == ((Vcc/s) - V4)/R7, I8 == ((Vcc/s) - V2)/R8}, {IB, IC, IE, I1,
I2, I3, I4, I5, I6, I7, I8, I9, I10, I11, V1, V2, V3, V4}]]
Usando sus valores en mi código obtuve:
FullSimplify[
Solve[{IE == IB + IC, \[Beta] == IC/IB, VBE == V2 - V3,
I3 == I1 + I2, 0 == I2 + I4 + I9, I5 == I9 + I10, IE == I4 + I5,
I1 + I8 == I3 + I11, I11 == IB + I6, IC == I6 + I7, I10 == I7 + I8,
I1 == (((Vin*s)/(s^2 + \[Omega]^2)) - V1)/10000,
I1 == (V1 - V2)/((1/(s*((1/10)*10^(-6))))), I3 == V2/20000,
I4 == V3/1000, I5 == V3/((1/(s*((1/10)*10^(-6))))),
I6 == (V2 - V4)/((1/(s*((10)*10^(-12))))),
I7 == ((Vcc/s) - V4)/7500, I8 == ((Vcc/s) - V2)/150000}, {IB, IC,
IE, I1, I2, I3, I4, I5, I6, I7, I8, I9, I10, I11, V1, V2, V3, V4}]]
Usando ese código, me dio:
{{IB -> ((10000 +
s) (s^2 (80000000000 Vcc +
s (-(680000000000 + s (1880171000 + 261 s)) VBE +
2 (40063000 + 63 s) Vcc +
30 (40000000 + 3 s) Vin)) + (-s (680000000000 +
s (1880171000 + 261 s)) VBE +
2 (1000 + s) (40000000 +
63 s) Vcc) \[Omega]^2))/(100000 s (9 s^3 (1 + \[Beta]) \
+ 4000000000000 (317 + 17 \[Beta]) + 300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
IC -> ((10000 +
s) \[Beta] (s^2 (80000000000 Vcc +
s (-(680000000000 + s (1880171000 + 261 s)) VBE +
2 (40063000 + 63 s) Vcc +
30 (40000000 + 3 s) Vin)) + (-s (680000000000 +
s (1880171000 + 261 s)) VBE +
2 (1000 + s) (40000000 +
63 s) Vcc) \[Omega]^2))/(100000 s (9 s^3 (1 + \[Beta]) \
+ 4000000000000 (317 + 17 \[Beta]) + 300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
IE -> ((10000 +
s) (1 + \[Beta]) (s^2 (80000000000 Vcc +
s (-(680000000000 + s (1880171000 + 261 s)) VBE +
2 (40063000 + 63 s) Vcc +
30 (40000000 + 3 s) Vin)) + (-s (680000000000 +
s (1880171000 + 261 s)) VBE +
2 (1000 + s) (40000000 +
63 s) Vcc) \[Omega]^2))/(100000 s (9 s^3 (1 + \[Beta]) \
+ 4000000000000 (317 + 17 \[Beta]) + 300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I1 -> -((s^2 (9 s^3 VBE (1 + \[Beta]) +
3 s^2 (-3 Vin (1 + \[Beta]) +
10000 VBE (4003 + 3 \[Beta])) +
4000000000 (2 Vcc (1 + \[Beta]) -
Vin (317 + 17 \[Beta])) +
300 s (4000000000 VBE + 42 Vcc (1 + \[Beta]) -
Vin (400357 +
357 \[Beta]))) + (9 s^3 VBE (1 + \[Beta]) +
8000000000 Vcc (1 + \[Beta]) +
30000 s^2 VBE (4003 + 3 \[Beta]) +
600 s (2000000000 VBE +
21 Vcc (1 + \[Beta]))) \[Omega]^2)/(10000 (9 s^3 (1 + \
\[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2))),
I2 -> (s^2 (27 s^4 VBE (1 + \[Beta]) +
8000000000000 Vcc (1 + \[Beta]) +
200000 s (6000000000 VBE + 120063 Vcc (1 + \[Beta]) -
80000 Vin (151 + \[Beta])) +
18 s^3 (-Vin (1 + \[Beta]) + 500 VBE (40031 + 31 \[Beta])) +
600 s^2 (63 Vcc (1 + \[Beta]) +
50000 VBE (124003 + 3 \[Beta]) -
2 Vin (200171 + 171 \[Beta]))) + (1000 +
3 s) (9 s^3 VBE (1 + \[Beta]) +
8000000000 Vcc (1 + \[Beta]) +
30000 s^2 VBE (4003 + 3 \[Beta]) +
600 s (2000000000 VBE +
21 Vcc (1 + \[Beta]))) \[Omega]^2)/(20000 s (9 s^3 (1 + \
\[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I3 -> (s^2 (9 s^4 VBE (1 + \[Beta]) +
8000000000000 Vcc (1 + \[Beta]) +
3000 s^3 VBE (40033 + 33 \[Beta]) +
200000 s (6000000000 VBE + (40063 Vcc +
600000 Vin) (1 + \[Beta])) +
600 s^2 (3 (7 Vcc + 5 Vin) (1 + \[Beta]) +
50000 VBE (44003 + 3 \[Beta]))) + (1000 +
s) (9 s^3 VBE (1 + \[Beta]) + 8000000000 Vcc (1 + \[Beta]) +
30000 s^2 VBE (4003 + 3 \[Beta]) +
600 s (2000000000 VBE +
21 Vcc (1 + \[Beta]))) \[Omega]^2)/(20000 s (9 s^3 (1 + \
\[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I4 -> ((1 + \[Beta]) (s^2 (80000000000 Vcc +
s (-(680000000000 + s (1880171000 + 261 s)) VBE +
2 (40063000 + 63 s) Vcc +
30 (40000000 + 3 s) Vin)) + (-s (680000000000 +
s (1880171000 + 261 s)) VBE +
2 (1000 + s) (40000000 +
63 s) Vcc) \[Omega]^2))/(10 s (9 s^3 (1 + \[Beta]) +
4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I5 -> ((1 + \[Beta]) (s^2 (80000000000 Vcc +
s (-(680000000000 + s (1880171000 + 261 s)) VBE +
2 (40063000 + 63 s) Vcc +
30 (40000000 + 3 s) Vin)) + (-s (680000000000 +
s (1880171000 + 261 s)) VBE +
2 (1000 + s) (40000000 +
63 s) Vcc) \[Omega]^2))/(100000 (9 s^3 (1 + \[Beta]) +
4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I6 -> (3 s^2 (-420000000 Vcc +
40 s ((1000 + s) (10000 + s) VBE - (12500 + s) Vcc +
1000 Vin) +
s (-(10000 + s) (17000 + 47 s) VBE + 2 (-19000 + s) Vcc +
10 (34000 + 3 s) Vin) \[Beta]) -
3 (-40 s (1000 + s) (10000 + s) VBE +
40 (10500000 + s (12500 + s)) Vcc +
s ((10000 + s) (17000 + 47 s) VBE -
2 (-19000 +
s) Vcc) \[Beta]) \[Omega]^2)/(100000 (9 s^3 (1 + \
\[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I7 -> (s^2 (20000000000000 Vcc \[Beta] - 3 s^4 VBE (1 + \[Beta]) +
500000 s (-200000 (1700 VBE - 3 Vin) \[Beta] +
Vcc (63 + 44063 \[Beta])) +
s^3 (3 Vcc (1 + \[Beta]) - 1000 VBE (33 + 47033 \[Beta])) -
500 s^2 (6 Vin (1 - 9999 \[Beta]) -
25 Vcc (3 + 163 \[Beta]) +
20000 VBE (3 +
48703 \[Beta]))) + (20000000000000 Vcc \[Beta] -
3 s^4 VBE (1 + \[Beta]) +
500000 s (-340000000 VBE \[Beta] +
Vcc (63 + 44063 \[Beta])) +
s^3 (3 Vcc (1 + \[Beta]) - 1000 VBE (33 + 47033 \[Beta])) -
12500 s^2 (-Vcc (3 + 163 \[Beta]) +
800 VBE (3 +
48703 \[Beta]))) \[Omega]^2)/(2500 s (9 s^3 (1 + \
\[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I8 -> (s^2 (-(40000000 + 3 s) (-10500000 Vcc +
s ((1000 + s) (10000 + s) VBE - (12500 + s) Vcc +
1000 Vin)) + (20000000000000 Vcc +
s (500000 (120063 Vcc - 80000 Vin) -
3 s ((1000 + s) (10000 + s) VBE - (12500 + s) Vcc +
1000 Vin))) \[Beta]) + (-(40000000 +
3 s) (s (1000 + s) (10000 + s) VBE - (10500000 +
s (12500 + s)) Vcc) + (-3 s^2 (1000 + s) (10000 +
s) VBE + (20000000000000 +
3 s (20010500000 +
s (12500 +
s))) Vcc) \[Beta]) \[Omega]^2)/(50000 s (9 s^3 (1 \
+ \[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I9 -> (s^2 (-27 s^4 VBE (1 + \[Beta]) -
168000000000000 Vcc (1 + \[Beta]) +
18 s^3 (Vin + Vin \[Beta] + 500 VBE (-39973 + 27 \[Beta])) +
200000 s (-921323 Vcc (1 + \[Beta]) +
400000000 VBE (2 + 17 \[Beta]) -
80000 Vin (-1 + 149 \[Beta])) +
200 s^2 (-1449 Vcc (1 + \[Beta]) +
6 Vin (200021 + 21 \[Beta]) +
20000 VBE (10063 +
940063 \[Beta]))) - (27 s^4 VBE (1 + \[Beta]) +
168000000000000 Vcc (1 + \[Beta]) -
9000 s^3 VBE (-39973 + 27 \[Beta]) -
200000 s (-921323 Vcc (1 + \[Beta]) +
400000000 VBE (2 + 17 \[Beta])) -
200 s^2 (-1449 Vcc (1 + \[Beta]) +
20000 VBE (10063 +
940063 \[Beta]))) \[Omega]^2)/(20000 s (9 s^3 (1 + \
\[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I10 -> (s^2 (-(40000000 + 63 s) (-10500000 Vcc +
s ((1000 + s) (10000 + s) VBE - (12500 + s) Vcc +
1000 Vin)) + (420000000000000 Vcc +
s (-(10000 + s) (340000000000 +
s (940063000 + 63 s)) VBE + (500661500000 +
s (40787500 + 63 s)) Vcc +
1000 (5960000000 +
599937 s) Vin)) \[Beta]) + (-(40000000 +
63 s) (s (1000 + s) (10000 + s) VBE - (10500000 +
s (12500 + s)) Vcc) + (-s (10000 + s) (340000000000 +
s (940063000 + 63 s)) VBE + (40000000 +
63 s) (10500000 +
s (12500 +
s)) Vcc) \[Beta]) \[Omega]^2)/(50000 s (9 s^3 (1 + \
\[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
I11 -> (s^2 (800000000000000 Vcc +
s (80000000000 (11 Vcc + 150 Vin) - (10000 + s) (17000 +
47 s) VBE (40000000 + 3 s (1 + \[Beta])) +
2 s (1000 Vcc (39943 - 57 \[Beta]) +
3 s Vcc (1 + \[Beta]) + 45 s Vin (1 + \[Beta]) +
30000 Vin (20017 +
17 \[Beta])))) - (-800000000000000 Vcc +
s (10000 + s) (17000 + 47 s) VBE (40000000 +
3 s (1 + \[Beta])) -
2 s Vcc (440000000000 + 1000 s (39943 - 57 \[Beta]) +
3 s^2 (1 + \[Beta]))) \[Omega]^2)/(100000 s (9 s^3 (1 + \
\[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
V1 -> (9 s^5 VBE (1 + \[Beta]) + 30000 s^4 VBE (4003 + 3 \[Beta]) +
8000000000 Vcc (1 + \[Beta]) \[Omega]^2 +
10000 s^2 (800000 Vcc (1 + \[Beta]) +
30 Vin (800357 + 400357 \[Beta]) +
3 VBE (4003 + 3 \[Beta]) \[Omega]^2) +
200 s (20000000000 Vin (317 + 17 \[Beta]) +
3 (2000000000 VBE + 21 Vcc (1 + \[Beta])) \[Omega]^2) +
3 s^3 (600 (7 Vcc + 10 Vin) (1 + \[Beta]) +
VBE (400000000000 +
3 (1 + \[Beta]) \[Omega]^2)))/((9 s^3 (1 + \[Beta]) +
4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
V2 -> (s^2 (9 s^4 VBE (1 + \[Beta]) +
8000000000000 Vcc (1 + \[Beta]) +
3000 s^3 VBE (40033 + 33 \[Beta]) +
200000 s (6000000000 VBE + (40063 Vcc +
600000 Vin) (1 + \[Beta])) +
600 s^2 (3 (7 Vcc + 5 Vin) (1 + \[Beta]) +
50000 VBE (44003 + 3 \[Beta]))) + (1000 +
s) (9 s^3 VBE (1 + \[Beta]) + 8000000000 Vcc (1 + \[Beta]) +
30000 s^2 VBE (4003 + 3 \[Beta]) +
600 s (2000000000 VBE +
21 Vcc (1 + \[Beta]))) \[Omega]^2)/(s (9 s^3 (1 + \
\[Beta]) + 4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
V3 -> (100 (1 + \[Beta]) (s^2 (80000000000 Vcc +
s (-(680000000000 + s (1880171000 + 261 s)) VBE +
2 (40063000 + 63 s) Vcc +
30 (40000000 + 3 s) Vin)) + (-s (680000000000 +
s (1880171000 + 261 s)) VBE +
2 (1000 + s) (40000000 +
63 s) Vcc) \[Omega]^2))/(s (9 s^3 (1 + \[Beta]) +
4000000000000 (317 + 17 \[Beta]) +
300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2)),
V4 -> (s^2 (9 s^4 VBE (1 + \[Beta]) +
4000000000000 Vcc (317 + 2 \[Beta]) +
3000 s^3 VBE (33 + 47033 \[Beta]) +
600 s^2 (15 Vin (1 - 9999 \[Beta]) +
Vcc (200021 - 9979 \[Beta]) +
50000 VBE (3 + 48703 \[Beta])) +
200000 s (1500000 (1700 VBE - 3 Vin) \[Beta] +
Vcc (7540063 +
610063 \[Beta]))) + (9 s^4 VBE (1 + \[Beta]) +
4000000000000 Vcc (317 + 2 \[Beta]) +
3000 s^3 VBE (33 + 47033 \[Beta]) +
600 s^2 (Vcc (200021 - 9979 \[Beta]) +
50000 VBE (3 + 48703 \[Beta])) +
200000 s (2550000000 VBE \[Beta] +
Vcc (7540063 +
610063 \[Beta]))) \[Omega]^2)/(s (9 s^3 (1 + \[Beta]) \
+ 4000000000000 (317 + 17 \[Beta]) + 300 s^2 (400417 + 417 \[Beta]) +
100000 s (15081071 + 1881071 \[Beta])) (s^2 + \[Omega]^2))}}
Asumiendo , , , y . Eso dio:
In[1]:=FullSimplify[
Solve[{IE == IB + IC, 100 == IC/IB, (7/10)/s == V2 - V3,
I3 == I1 + I2, 0 == I2 + I4 + I9, I5 == I9 + I10, IE == I4 + I5,
I1 + I8 == I3 + I11, I11 == IB + I6, IC == I6 + I7, I10 == I7 + I8,
I1 == (((5*s)/(s^2 + (100 Pi)^2)) - V1)/10000,
I1 == (V1 - V2)/((1/(s*((1/10)*10^(-6))))), I3 == V2/20000,
I4 == V3/1000, I5 == V3/((1/(s*((1/10)*10^(-6))))),
I6 == (V2 - V4)/((1/(s*((10)*10^(-12))))),
I7 == ((15/s) - V4)/7500, I8 == ((15/s) - V2)/150000}, {IB, IC, IE,
I1, I2, I3, I4, I5, I6, I7, I8, I9, I10, I11, V1, V2, V3, V4}]]
Out[1]={{IB -> ((10000 +
s) (10000 \[Pi]^2 (7240000000000 +
s (-1142297000 + 17073 s)) +
s^2 (7240000000000 +
s (58857703000 + 21573 s))))/(1000000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
IC -> ((10000 +
s) (10000 \[Pi]^2 (7240000000000 +
s (-1142297000 + 17073 s)) +
s^2 (7240000000000 +
s (58857703000 + 21573 s))))/(10000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
IE -> (101 (10000 +
s) (10000 \[Pi]^2 (7240000000000 +
s (-1142297000 + 17073 s)) +
s^2 (7240000000000 +
s (58857703000 + 21573 s))))/(1000000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I1 -> (s^2 (273800000000000 + 5446335000 s + 39087 s^2) -
30000 \[Pi]^2 (43200000000000 + 7 s (52120000 + 303 s)))/(
100000 (10000 \[Pi]^2 + s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I2 -> (30000 \[Pi]^2 (1000 + 3 s) (43200000000000 +
7 s (52120000 + 303 s)) +
s^2 (129600000000000000 +
s (189094520000000 -
3 s (3248779000 + 23937 s))))/(200000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I3 -> (30000 \[Pi]^2 (1000 + s) (43200000000000 +
7 s (52120000 + 303 s)) +
3 s^2 (43200000000000000 +
s (245564840000000 +
s (382111000 + 2121 s))))/(200000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I4 -> (101 (10000 \[Pi]^2 (7240000000000 +
s (-1142297000 + 17073 s)) +
s^2 (7240000000000 +
s (58857703000 + 21573 s))))/(100 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I5 -> (101 (10000 \[Pi]^2 (7240000000000 +
s (-1142297000 + 17073 s)) +
s^2 (7240000000000 +
s (58857703000 + 21573 s))))/(1000000 (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I6 -> (-30000 \[Pi]^2 (8960000000 + s (49141000 + 431 s)) +
3 s^2 (-8960000000 + s (35959000 + 7069 s)))/(
50000 (10000 \[Pi]^2 + s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I7 -> (10000 \[Pi]^2 (181000000000000000 +
s (-10443985000000 + s (-2355206000 + 43329 s))) +
s^2 (181000000000000000 +
s (1489556015000000 +
s (147629644000 + 43329 s))))/(25000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I8 -> (s^2 (360200000000000000 +
s (770376015000000 + s (6249644000 + 43329 s))) +
10000 \[Pi]^2 (360200000000000000 +
s (972376015000000 +
s (6264794000 + 43329 s))))/(500000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I9 -> (-10000 \[Pi]^2 (1592080000000000000 +
s (159150526000000 + 63 s (106963000 + 303 s))) +
s^2 (-1592080000000000000 +
3 s (-4026116842000000 +
s (1796197000 + 23937 s))))/(200000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I10 -> (10000 \[Pi]^2 (3980200000000000000 +
s (763496315000000 + 11 s (-3712666000 + 82719 s))) +
s^2 (3980200000000000000 +
s (30561496315000000 +
11 s (268985684000 +
82719 s))))/(500000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
I11 -> (-10000 \[Pi]^2 (-72400000000000000 +
s (4720570000000 + s (3920027000 + 8787 s))) +
s^2 (72400000000000000 +
s (595279430000000 +
s (61230973000 + 445713 s))))/(1000000 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
V1 -> (30000 \[Pi]^2 (43200000000000 + 7 s (52120000 + 303 s)) +
s (403400000000000000 +
3 s (247380285000000 +
s (395140000 + 2121 s))))/(10 (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
V2 -> (30000 \[Pi]^2 (1000 + s) (43200000000000 +
7 s (52120000 + 303 s)) +
3 s^2 (43200000000000000 +
s (245564840000000 +
s (382111000 + 2121 s))))/(10 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
V3 -> (1010 (10000 \[Pi]^2 (7240000000000 +
s (-1142297000 + 17073 s)) +
s^2 (7240000000000 +
s (58857703000 + 21573 s))))/(s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s)))),
V4 -> (3 s^2 (222400000000000000 +
s (-473615160000000 + s (-140997889000 + 2121 s))) +
30000 \[Pi]^2 (222400000000000000 +
s (1026384840000000 +
s (8986961000 + 2121 s))))/(10 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s))))}}
Entonces, el voltaje de salida , dada por:
(3 s^2 (222400000000000000 +
s (-473615160000000 + s (-140997889000 + 2121 s))) +
30000 \[Pi]^2 (222400000000000000 +
s (1026384840000000 +
s (8986961000 + 2121 s))))/(10 s (10000 \[Pi]^2 +
s^2) (8068000000000000 +
s (20318817100000 + 3 s (44211700 + 303 s))))
Lo que da cuando se traza:
Marca: ¿qué quieres: una "demostración" (cálculo) o una explicación de este efecto?
Sin embargo, en lo que respecta a la corriente a través de la tapa, hay dos voltajes que determinan la corriente a través del condensador: el voltaje de entrada en la base (Vb) y el voltaje (mucho mayor) en el otro lado (voltaje de colector Vc = -|A|*Vb con A=ganancia).
Por lo tanto, la corriente a través de la tapa es mucho mayor en comparación con el caso en el que el otro lado de la tapa tendría un potencial fijo (tierra o cualquier valor de CC). Por lo tanto, la resistencia de entrada de este camino parece correspondientemente más baja. Ese es el contenido del efecto MILLER.
El voltaje a través de la tapa es (Vb-Vc) con Vc=-|A|*Vb resultando en
(Vb-Vc)=Vb(1+|A|),
y la corriente a través del condensador es Ic=(Vb-Vc)/Xc=Vb(1+|A|)/Xc .
Eso significa que la reactancia capacitiva Xcc, vista solo desde la entrada, parece mucho más baja que Xc = 1/wC con:
Xcc=Vb/Ic=Xc/(1+|A|)
En conclusión, el efecto MILLER reduce la impedancia de entrada en el nodo base.
Comentario final: por supuesto, la impedancia de entrada total contiene en paralelo la resistencia de entrada como se ve en el transistor.
Neil_ES
Jan Eerland
LvW