GATE Electrical – Analog Electronics
Page 4: Diode Clipper Circuits
Clipper circuits are wave shaping circuits that remove or clip a portion of an input signal without distorting the remaining waveform. These circuits are widely used in signal processing and communication systems.
1. What is a Clipper Circuit?
A Clipper circuit is an electronic circuit that limits the output voltage to a certain level by removing a part of the input waveform.
Clipper circuits use diodes to control which part of the signal is allowed to pass.
- Removes unwanted voltage peaks
- Protects circuits from high voltage
- Used in signal shaping applications
2. Positive Clipper
A positive clipper removes the positive half of the input waveform.
Working Principle
- During positive half cycle → diode becomes forward biased.
- Output voltage becomes nearly zero.
- During negative half cycle → diode becomes reverse biased.
- Negative signal appears at the output.
Thus the positive part of the waveform is clipped.
3. Negative Clipper
A negative clipper removes the negative half of the input signal.
Working Principle
- During positive half cycle → diode is reverse biased.
- Positive signal appears at output.
- During negative half cycle → diode becomes forward biased.
- Output becomes zero.
4. Biased Clipper
A biased clipper clips the waveform at a specific voltage level using a DC voltage source.
This allows engineers to control the clipping level.
Output Voltage = Vbias ± Diode Drop
5. Applications
- Waveform shaping circuits
- Communication systems
- Voltage protection circuits
- Signal processing
GATE Important Points
- Clippers remove portions of waveform.
- Used for voltage limiting.
- Diode orientation determines clipping type.
- Biased clippers allow adjustable clipping levels.
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