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Question
I-V characteristics of four devices are shown in Figures.
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 |
 |
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| (i) | (ii) | (iii) | (iv) |
Identify devices that can be used for modulation.
Options
'i’ and ‘iii’.
only ‘iii’.
‘ii’ and some regions of ‘iv’.
All the devices can be used.
Solution
‘ii’ and some regions of ‘iv’.
Explanation:
A square law modulator is a device which can produce modulated waves by the application of the message signal and the carrier wave.
A square law modulator is used for modulation purposes. Characteristics shown by (i) and (iii) correspond to linear devices.
And by (ii) corresponds to the square law device which shows non-linear relations. Some parts of (iv) also follow square law.
Hence, (ii) and (iv) can be used for modulation.
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