The primary function of a clamper circuit is

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SDSC (ISRO) Technician B (Electronic Mechanic): Previous Year Paper (Held on 29 April 2018)
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  1. Suppress variations in signal voltage
  2. Raise the positive cycle of the signal
  3. Lower the negative cycle of the signal
  4. Introduce a DC level to an ac signal

Answer (Detailed Solution Below)

Option 4 : Introduce a DC level to an ac signal
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Detailed Solution

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  • A Clamper Circuit is a circuit that adds a DC level to an AC signal.
  • The shape of the output waveform does not change in Clamper circuits. 
  • Since the clamper circuit adjusts the DC level of the waveform as shown in the following figure, it is called DC restorer.
  •  

    Clamping circuit:

             

    • For proper working of a clamper, the time constant of the circuit should be large because the voltage across the capacitor C does not change significantly during the time interval the diode is non-conducting
    • The circuit time constant (t = RC) should be at least ten times the time period of the input signal voltage
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