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Definition of "Noise Figure" |
The ratio of output noise to input noise in a receiver. The ratio of the output noise power of a device to the portion thereof attributable to thermal noise in the input termination at standard noise temperature (usually 290 K). The common logarithm of the ratio of the input signal to noise ratio to the output signal to noise ratio. Noise factor expressed in decibels. At a selected input frequency, the noise figure is the ratio of the total noise power per unit bandwidth (at a corresponding output frequency) delivered to the output termination, to the portion thereof contributed at the input frequency by the input termination, whose noise temperature is standard (293K) at all frequencies. / Noise Figure and noise factor are measures of degradation of the signal-to-noise ratio, caused by components in a radio frequency signal chain. It is a number by which the performance of an amplifier or a radio receiver can be specified. / Wide Area Information Service is a distributed information service and search engine that allows natural language input and indexed searching. Many Web search utilities use a WAIS engine. / an indication of the contribution of that component or system to the level of noise observed at the output. The noise figure therefore gives an idea of the amount of noise generated within the component or system itself. It is usually expressed in decibels (dB) and is given by the ratio of the input signal-to-noise ratio to the output signal-to-noise ratio of the component or system. This is defined as |
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