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© 2008 The McGraw-Hill Companies

59

9-5: Noise

Expressing Noise Levels

The noise quality of a receiver can be expressed in the following terms:

The noise factor is the ratio of the S/N power at the input to the S/N power at the output.

When the noise factor is expressed in decibels, it is called the noise figure.

Most of the noise produced in a device is thermal, which is directly proportional to temperature. Therefore, the term noise temperature (TN) is used.

SINAD is the composite signal plus noise and distortion divided by noise and distortion contributed by the receiver.

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