Ea 15 Octubre 2007

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Electrónica Analógica

Unión PN

CIRCUITOS EQUIVALENTES DE UN DIODO

A

K

Diodo real

I (mA)

V(v)



q⋅V

I = I s ⋅ (e K ⋅T −1)

CD

A

K

Vγ RF

D ON (P.D.)

I = - Is CT

A

K RR

D OFF (P.I.)

1ª aproximación

1

Electrónica Analógica

Unión PN

I≠0

I (mA)

/R

F

I=0 Vγ

tg α

=1

A

α V(v)



K

RF

D ON (VA-VK > Vγ)

A

K

D OFF (VA-VK < Vγ)

2ª aproximación I≠0

I (mA)

I=0 A Vγ

V(v)

K



D ON (VA-VK > Vγ)

A

K

D OFF (VA-VK < Vγ)

3ª aproximación I (mA)

I≠0

1/

R

F

I=0

tg

α=

A

α

Vγ = 0

V(v)

K

RF

D ON (VA-VK > Vγ)

A

K

D OFF (VA-VK < Vγ)

4ª aproximación (diodo ideal) I (mA)

I≠0

I=0

A

K

D ON (VA-VK > Vγ) Vγ = 0

V(v)

2

A

K

D OFF (VA-VK < Vγ)

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