Transcript 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 Series
Clippers
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 Clippers
Unbiased 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
Unbiased Series Clippers (Cont..):
Analysis of series negative clipper:
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
Unbiased Series Clippers (Cont..):
Analysis of series negative clipper:
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.
Unbiased Series Clippers (Cont..):
Analysis of series negative clipper:
Unbiased Series Clippers (Cont..):
Analysis of series negative clipper:
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
Analysis of Biased series clipper:
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
Analysis of Biased series clipper:
Fig (e). input waveform
Series Clippers
Analysis of Biased series clipper:
Fig (f). VBB connected in series with diode.
Series Clippers
Analysis of Biased series clipper:
Fig (e) shows the input applied to the
circuit.
Fig (f) shows the VBB connected in
series with diode.
Series Clippers
Analysis of Biased series clipper:
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 diode
Shown 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 Pside 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 Pointd(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.
S0, diode acts open circuit.
So, in this case Vo will be 0V.
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 Pside 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:
Fig (h). The output waveform
Series Clippers
Analysis of Biased series clipper:
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
Analysis of different biased Biased 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
Analysis of different biased Biased series
clippers:
Case 2:
Series Clippers
Analysis of different biased Biased series
clippers:
Transfer characteristic equation for case-2
can be written as
Vo=0V
…..for Vin≤ -2.5V
Vo= Vin,new …..for Vin> -2.5V
Series Clippers
Analysis of different biased Biased series
clippers:
Case 3:
Series Clippers
Analysis of different biased Biased 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
Analysis of different biased Biased series
clippers:
Case 4:
Series Clippers
Analysis of different biased Biased series
clippers:
Transfer characteristic equation for case-4
can be written as
Vo=0V
…..for Vin≤ -2.5V
Vo= Vin,new …..for Vin> -2.5V