Series Clippers

Series Clippers

Prepared By: Eng.Maira Naz

Dated:08-08-11

Series Clippers

Series Clippers

Series Clipper name is given on the fact because diode is connected in series with load resistance RL.

Series Clippers

Some important points regarding to series clippers:

In series clippers, whenever diode is forward biased, then voltage drop across the load resistance will follow Vin.

In series clippers, whenever the diode is reverse biased, then the voltage drop across the diode will be zero.

Series Clippers

Classification of Series Clippers:

Series Clippers

Unbiased SeriesClippers

Biased Parallel Clippers

Unbiased series clippers

Series Clippers

Unbiased Series Clippers:

In Unbiased series clippers there is no battery connected in series with diode.

Series Clippers

Unbiased Series Clippers (Cont..):Series Negative Clipper:

In series negative clipper, the negative half cycle of input voltage is clipped off.

A series negative clipper is basically a half wave rectifier circuit.

Series ClippersUnbiased Series Clippers (Cont..):Series Negative Clipper:

Fig (a). Series Negative Clipper

Series Clippers

Unbiased Series Clippers (Cont..):Analysis of series negative clipper:

During the positive half cycle of input voltage, diode remains forward biased.

So, during the entire positive half cycle of input voltage, diode acts as short circuit.

So, the forward voltage drop across diode is zero in case of ideal diode.

Series Clippers


So, the entire positive half cycle will appear across the load resistance.

During the negative half cycle of input voltage, diode remains reverse biased.

So, it acts as open circuit during the entire negative half cycle of Vin.

Series Clippers


So, the entire voltage will drop across the diode during the negative half cycle.

As a result, no voltage drop will appear across the load resistance RL.



Transfer characteristics equation for the circuit shown in fig (a) can be written as.

Vo=0V …..for Vi ≤ 0V

Vo=Vin, …..for Vi > 0V

Series Clippers

Unbiased Series Clippers (Cont..):

Series Positive Clipper:

In series Positive clipper, the positive half cycle of input voltage is clipped off.

Unbiased Series Clippers (Cont..):Analysis of Series Positive Clipper:

Fig (c). Series positive clipper

Activity

Activity done by students:Write down all the steps for the analysis

of any clipper circuit.Analyze the series positive clipper given

in fig (c).Analyze the circuit by explaining the

circuit through all the steps in detail.

Biased series clippers

Series Clippers

Analysis of Biased series clipper:

Fig (d). Biased series clipper

Series Clippers


Fig (d). Shows the series biased clipper where the dc source is connected in series with the diode.

Taking the assumption that RL>> Rin.

Series Clippers


Fig (e). input waveform

Series Clippers


Fig (f). VBB connected in series with diode.

Series Clippers


Fig (e) shows the input applied to the circuit.

Fig (f) shows the VBB connected in series with diode.

Series Clippers


Fig (g). The sum of waveform (e) & (f).

Series Clippers

Analysis of Biased series clipper:Ideal diode:Fig (g). Shows the waveform that is the

sum of waveform (e) & (f).This Vin,new applied to the diode.Now the diode will be the forward biased

or reverse biased according to the Vin,new wave form.

Series Clippers

Analysis of Biased series clipper:The voltage appears at N side of diodeShown in fig (d) will be 0V.when the

diode is replaced with ideal model.Point-a to point-b:Now, when Vin,new waveform varies

from point-a(-5V) to point-b(0V), diode is reverse biased because voltage on P-side is less than to N-side.

Series Clippers

Analysis of Biased series clipper: S0, diode acts open circuit. So, in this case Vo will be 0V.

Point-b to point-d: Now, when Vin,new varies from Point-b(0V) to

point-d(10V), in this case diode will be forward biased.

So, it acts as short circuit. So, Vo follows Vin,new in this case.

Series Clippers

Analysis of Biased series clipper:Point-d to point-f:Now, when Vin,new varies from Point-

d(10V) to point-f(0V), in this case diode will be forward biased.

So, it acts as short circuit.So, Vo follows Vin,new in this case.

Series Clippers

Analysis of Biased series clipper:Point-f to point-g:Now, when Vin,new waveform varies

from point-f(0V) to point-g(-5V), diode is reverse biased because voltage on P-side is less than to N-side.

S0, diode acts open circuit.So, in this case Vo will be 0V.

Series Clippers

Analysis of Biased series clipper:Point-g to point-h:Now, when Vin,new waveform varies

from point-g(-5V) to point-h(-20V), diode is reverse biased because voltage on P-side is less than to N-side.


Series Clippers

Analysis of Biased series clipper:Point-h to point-i:Now, when Vin,new waveform varies

from point-h(-20V) to point-i(-5V), diode is reverse biased because voltage on P-side is less than to N-side.


Series Clippers


Fig (h). The output waveform

Series Clippers


Transfer characteristics equation can be written as

Vo=0V …..for Vin ≤ 5V

Vo= Vin,new …..for Vin> 5V

Analysis of different biased Biased series clippers

Series Clippers

Analysis of different biased Biased series clippers:

Case 1:

Series Clippers


Transfer characteristic equation for case-1 can be written as

Vo=0V …..for Vin ≥2.5V

Vo= Vin,new …..for Vin<2.5V

Series Clippers


Case 2:

Series Clippers



Vo=0V …..for Vin≤ -2.5V

Vo= Vin,new …..for Vin> -2.5V

Series Clippers


Case 3:

Series Clippers



Vo=0V …..for Vin ≥2.5V

Vo= Vin,new …..for Vin<2.5V

Series Clippers


Case 4:

Series Clippers



Vo=0V …..for Vin≤ -2.5V

Vo= Vin,new …..for Vin> -2.5V

Documents

Series Clippers