DIODE MODELS WHEN IT IS IN REVERSED BIAS:

DIODE MODELS WHEN IT IS IN REVERSED BIAS:

Same like forward biasing in reversed biasing we study about three models of diode.

      1.      Ideal model

      2.      Practical model

      3.      Complete model

IDEAL MODEL:

  In ideal model of diode in reversed bias we keep

diode model

 ‘ Ir’ is zero such as

Ir = 0

So by applying K.V.L rule we got the equation which is

Vbias – Vrlimit – Vr=0

Here

Vrlimit = Ir. Rlimit

And Ir is zero so Vrlimit also become zero

Hence

Vbias – 0 – Vr= 0

Vr = Vbias

PRACTICAL MODEL:

  In practical model the ’Ir’ remains zero such as

Ir = 0

diode model

So by applying K.V.L rule we got the equation which is

Vbias – Vrlimit – Vr=0

Here

Vrlimit = Ir. Rlimit

And Ir is zero so Vrlimit also become zero

Hence

Vbias – 0 – Vr= 0

Vr = Vbias

diode model

COMPLETE MODEL:

  In complete we considered all the resistance in circuit so there will be a value for ‘Ir’ which will greater than zero so ‘Ir’ will be something

Ir ≠ 0

By applying K.V.L rule we got 

Vbias – Vrlimit – Vr =0

Here

 Vrlimit = Ir. Rlimit and Ir ≠ 0

So

Vr = Vbias – Vrlimit