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Friis formulas for noise
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<p>Friis formula or Friis's formula (sometimes Friis' formula), named after Danish-American electrical engineer <a href="/facts/Harald_T._Friis/rmVuNk29">Harald T. Friis</a>, is either of two formulas used in <a href="/facts/Telecommunications_engineering/xq79k0PW">telecommunications engineering</a> to calculate the <a href="/facts/Signal-to-noise_ratio/qohClhyG">signal-to-noise ratio</a> of a multistage <a href="/facts/Amplifier/pnRgxncC">amplifier</a>. One relates to <a href="/facts/Noise_factor/XUtUWKDL">noise factor</a> while the other relates to <a href="/facts/Noise_temperature/t3Ecsmg5">noise temperature</a>. </p>