Make Accurate Sub-1 dB Noise Figure Measurements. Part 1: Noise Concepts
One of the most important capabilities of a radio receiver is its ability to reliably detect very weak RF signals. The circuits of a radio receiver inevitably generate electrical noise, which may mask the received signal if the receiver is not properly designed to minimize this noise. The accurate measurement of the receiver’s noise performance is of paramount importance in the assessment of its suitability for reliable communications. This concern is compounded by the fact that modern RF systems are increasingly powered by batteries which necessitates the reduction in transmitter output power, which commensurately
reduces signal levels at the receiver.
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