is the conduction that allows the current through the PN junction

To Bias a diode , you apply a EC voltage across it.

The bias voltage (Vbias), must be greater than the barrier potential.

The positive side of 𝑉𝐵𝑖𝑎𝑠 is connected to the N region of the diode and the Negative side is connected to the P region

In Ideal Diode Model for forward bias Vf = …

In Ideal Diode Model for forward bias if = …

In Practical Diode Model for forward bias Vf = ..

Find i1 , id1 use 0.7v drop model

Vo = 0.7

Signals: It is the voltage that change in the time in a particular way

is generally considered as unidirectional and not varying with time

A voltage that is varies with time may be called varying direct voltage

It is simply a voltage rising(or failing ) at constant rate

It is a periodic ramp signal

It is simply a symmetrical ramp.

The sinusoidal signal is a voltage that vary with time according to a cosine function

It is characterized by amplitude and
frequency.

is a signal defined by amplitude and pulse width

Pulses can't have negative polarit

a signal that varies in time