GATE Electrical – Analog Electronics
Page 5: Diode Clamper Circuits
Clamper circuits are wave shaping circuits that shift the entire waveform to a different DC level without changing the shape of the signal.
These circuits are widely used in communication systems and signal processing.
1. What is a Clamper Circuit?
A Clamper is an electronic circuit that adds a DC level to an AC signal. It shifts the signal either upward or downward.
Unlike clippers, clamper circuits do not remove parts of the waveform. Instead, they move the entire waveform up or down.
- Uses diode
- Uses capacitor
- Uses resistor
2. Positive Clamper
A positive clamper shifts the waveform upward so that the negative peak touches the zero reference level.
Working Principle
- During negative half cycle → diode conducts.
- Capacitor charges.
- During positive half cycle → diode becomes reverse biased.
- Capacitor voltage shifts the waveform upward.
3. Negative Clamper
A negative clamper shifts the waveform downward so that the positive peak touches the zero reference level.
Working Principle
- During positive half cycle → diode conducts.
- Capacitor charges.
- During negative half cycle → diode becomes reverse biased.
- Waveform shifts downward.
4. Biased Clamper
A biased clamper shifts the waveform to a specific voltage level using an additional DC source.
Clamping Level = Vbias ± Diode Drop
5. Applications
- Signal restoration circuits
- Television receivers
- Communication systems
- Voltage shifting circuits
Important GATE Points
- Clamper shifts waveform vertically.
- Uses capacitor + diode combination.
- Shape of waveform remains unchanged.
- Used for DC level shifting.
Next Page → Zener Diode Voltage Regulation
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