Discussion
Consider the following pairs of circuit and what it does to a waveform.
Clipper - Removes part beyond a level
Clamper - Shifts the direct level
Rectifier - Passes one polarity only
Voltage doubler - Doubles the frequency
How many of the pairs given above are correctly matched?
Answer: C
The first three are correctly paired and the fourth is not, so three match. A voltage doubler doubles the output voltage rather than the frequency, by charging two capacitors on alternate half cycles and adding them in series. Each of these circuits uses a diode and a reference and they are easily confused, so the distinction between altering the shape, the position and the amplitude is worth fixing firmly. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb.
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