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Receiver Noise

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Noise, Receiver 

the electrical fluctuations that occur mainly in the input circuits (for example, amplifiers and filters) of radio-receiving apparatus (seeFLUCTUATIONS, ELECTRICAL).

When combined with noises from external sources, such as atmospheric noise, terrestrial noise, and cosmic noise, a total noise is produced that acts as a natural threshold of the sensitivity of the radio receiver. The quantitative characteristic of receiver-noise intensity is its noise temperature. For example, until the 1950’s, the input devices used in superhigh-frequency radio receivers had noise temperatures of more than 2000°K, which was many times higher than the noise temperatures of the external sources. Subsequently, low-noise, superhigh-frequency amplifying devices were invented, such as tunnel diodes, parametric amplifiers, and quantum mechanical amplifiers, which made it possible to lower the receiver-noise temperatures, respectively, to values of the order of 300°, 30°, and 3 K, thereby improving the sensitivity of superhigh-frequency radio receivers by about 10 to 50 times.

REFERENCE

Ainbinder, 1. M. Shumy radiopriemnikov. Moscow, 1974.

I. M. AINBINDER



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The receiver noise figure ultimately determines the receiver sensitivity.
It's capable of driving the PA from 2 W - 40 W, while providing an effective receiver noise figure per path of 3 dB.
Using a probabilistic approach, the analytical evaluation of system performance gives rise to the key concept of link budget, showing the role of transmit power, channel bandwidth and receiver noise level.
 
 
 
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