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Which of the following is not a part of traditional RF subsystems?

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Which of the following is not a part of traditional RF subsystems?

(a) Filter

(b) Low noise amplifier

(c) Multiplexer

(d) Frequency translation

I have been asked this question in quiz.

My doubt is from ADC Tradeoffs topic in section Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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Correct choice is (c) Multiplexer

Easiest explanation: The traditional RF subsystems comprise of preamplifier, low noise amplifier, filters, RF distribution, frequency translation, and filtering stages that convert RF signals to IF signals. Multiplexer is used in digital RF systems.

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