Question

Which statement is true for low level amplitude modulation?

(a) all RF amplifiers are of class A

(b) all RF amplifiers can be linear

(c) minimum RF power is required

(d) maximum RF power is required

This question was posed to me in quiz.

This intriguing question comes from Instantaneous Frequency and Frequency Modulation topic in division Angle Modulation of Analog Communications

Answer 1

Correct option is (b) all RF amplifiers can be linear

The best I can explain: For low level AM, modulation is done at low power of carrier and modulating signal, so power amplifiers are used to boost the carrier and modulating signal. Therefore, output power is low. Thus, the amplifiers used are linear.