Читать книгу Handbook of Microwave Component Measurements - Joel P. Dunsmore - Страница 31

The excess noise is measured relative to the kTB noise floor and is expressed in dBc relative to the T₀ noise floor. However, the noise power could also be expressed in absolute terms such as dBm. But the measured noise power depends upon the bandwidth of the detector, and so the noise power density provides a reference value with a bandwidth equivalent to 1 Hz. Thus, the noise power density is the related to the excess noise by

(1.69)