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Which among the following is not a part of RF front-end section in receive mode?

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Which among the following is not a part of RF front-end section in receive mode?

(a) Antenna-matching unit

(b) Low-noise amplifier

(c) Power amplifier

(d) ADC

The question was posed to me in an interview for internship.

My enquiry is from Hardware Architecture topic in section Software Defined Radio Architecture of Cognitive Radio

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The correct choice is (c) Power amplifier

For explanation: The RF front-end section in receive mode consists of antenna-matching unit, low noise amplifiers, filters, local oscillators, and analog to digital converters. The power amplifier is a part of RF front-end section in transmit mode.

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