Concept:A clamper (DC restorer) uses a diode, capacitor, and resistor to add a DC offset to an AC signal, shifting the entire waveform above or below a reference voltage without changing its shape.
Formula:$$V_{\text{out}}(t) = V_{\text{in}}(t) \pm V_{\text{dc}} \quad \text{with peak-to-peak voltage preserved: } V_{pp,\text{out}} = V_{pp,\text{in}}$$
Solution:- A clamper charges a series capacitor to the peak input voltage, adding a fixed DC offset to the output.
- This shifts the waveform vertically while preserving its original shape and peak-to-peak amplitude.
Why other options are incorrect:- Option A: Removing or cutting off portions of a waveform is the function of a clipper (limiter) circuit.
- Option B: Amplification is performed by active transistor or operational amplifier circuits.
- Option C: Converting sine waves to triangular waves is done using integrator circuits.
Quality & Fidelity Assurance:
Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.