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The modem must control ____ to produce the desired carrier frequency.

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The modem must control ____ to produce the desired carrier frequency.

(a) filter

(b) low noise amplifier

(c) power amplifier

(d) antenna-matching unit

The question was asked in examination.

Enquiry is from Hardware Architecture in chapter Software Defined Radio Architecture of Cognitive Radio

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Best answer
Correct answer is (c) power amplifier

The best explanation: The modem controls external RF elements, including transmit and receive mode, carrier frequency and smart antenna. The modem controls power amplifier and local oscillators to produce the desire carrier frequency.

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