Question 6A478

An RF amplification stage significantly enhances receiver performance. It improves **sensitivity** by amplifying weak incoming signals *before* they encounter noisier subsequent stages, making them easier to detect. This early signal boost also leads to an **improved signal-to-noise ratio (SNR)**, as the desired signal is made stronger relative to the noise generated within the receiver itself. Additionally, the RF amplifier often includes tuned circuits, providing **improved selectivity** by rejecting strong out-of-band signals that could otherwise overload the mixer or create unwanted interference. By delivering a stronger, cleaner, and isolated signal, it ensures **more efficient and stable operation of the detector**. This isolation prevents the antenna from loading the mixer and helps prevent local oscillator radiation, contributing to overall receiver stability and optimal detection. Therefore, all listed advantages are benefits of an RF amplification stage.