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For a low level AM system, amplifier modulated stage must have _________(a) harmonic devices(b) linear devices(c) non-linear devices(d) class A amplifiersThe question was posed to me in an international level competition.This intriguing question originated from Method of Generation of SSB-SC in division SSB Modulation of Analog Communications

Answer»

Right choice is (b) LINEAR devices

Easy explanation: In low-LEVEL modulation, the generation of amplitude modulated signal takes place at low power levels. The generated AM signal is then amplified using a CHAIN of linear amplifiers, which are required to avoid WAVEFORM distortion. THUS, linear devices are used in low level amplitude modulated system.


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