What is the primary purpose of an RF amplifier in a receiver?

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Multiple Choice

What is the primary purpose of an RF amplifier in a receiver?

The front-end RF amplifier is there to provide most of the receiver’s gain. Placing amplification early boosts weak signals right at the input, so the subsequent mixer and IF stages can operate with a stronger signal. This helps preserve the signal-to-noise ratio as the signal goes through the rest of the receiver, which is why the overall sensitivity improves. The improvement to the noise figure is a helpful consequence—having a strong first stage means the later, noisier stages contribute less to the total noise figure—but the primary job of the RF amplifier is to deliver that main gain to the system. AGC voltage is typically generated from the detected output to adjust gain elsewhere, and image rejection comes primarily from filtering and mixer design, not from the RF amplifier setting.

The front-end RF amplifier is there to provide most of the receiver’s gain. Placing amplification early boosts weak signals right at the input, so the subsequent mixer and IF stages can operate with a stronger signal. This helps preserve the signal-to-noise ratio as the signal goes through the rest of the receiver, which is why the overall sensitivity improves. The improvement to the noise figure is a helpful consequence—having a strong first stage means the later, noisier stages contribute less to the total noise figure—but the primary job of the RF amplifier is to deliver that main gain to the system. AGC voltage is typically generated from the detected output to adjust gain elsewhere, and image rejection comes primarily from filtering and mixer design, not from the RF amplifier setting.

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