GATE Bits – Working of Op Amp Clipper Circuits
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GATE Bits – Working of Op Amp Clipper Circuits
Op Amp Clipper Circuits is an important topic for GATE EE and GATE EC exams. Its theory is very easy to understand. What makes it even important is that you can quickly solve it during the exam, earning easy marks. So make sure to go through this informative piece to ensure good marks in GATE
2016 exam. We have also learnt the workings of an op amp clamper.
Learn the Working of an Op Amp Clamper
Op amp circuits that remove part(s) of the input signal as per requirement are called Op Amp Clipper
Circuits. The clipping level is determined by the reference voltage V ref
, which should be less than the op amp input voltage i.e. V ref
< V in_max.
Working of Op Amp Clipper Circuits
We will explain the working of an Op Amp Clipper Circuit through a positive clipper. Circuits that
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GATE Bits – Working of Op Amp Clipper Circuits - Visit Testbook Blog for more useful articles by Testbook.com - Best Place for Online Exam Preparation remove positive parts of the input signal are called Positive Clipper circuits.
The circuit for a positive clipper is shown below.
Here, V in
is connected to positive terminal while V ref
is obtained from the negative terminal. In this circuit, the portions from the positive half cycle get clipped.
Input Signal
Let V in
be a sinusoidal input wave/signal. Here V ref
is positive (constant) dc value as shown in the input.
Output Signal
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Functioning
1. When V in
< V ref
, diode D conducts because the output voltage of op amp becomes negative w.r.t
diode, leading to conduction ? V out
= V in
2. When V in
> V ref
then V id
= V in
– V ref
> 0 ? Diode D stops conducting due to reverse bias. Hence
V out
= V ref
until V in
> V ref
.
3. When V in
falls below V ref
again, then V out
= V in
. This case is true for the negative cycle as well.
Variations
Now, we will see the clipper circuit for V ref
< 0 (Notice the difference in both circuits). Same process will be followed as before but since V ref
< 0, the output wave form will be different.
Diode D conducts for V in
– V ref
> 0 and is reverse biased for V in
– V ref
< 0.
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GATE Bits – Working of Op Amp Clipper Circuits - Visit Testbook Blog for more useful articles by Testbook.com - Best Place for Online Exam Preparation
Output
Exercise
Now try predicting wave form of the Negative Clipper Circuit given below.
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