DBc: Difference between revisions
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{{lowercase|title=dBc}} |
{{lowercase|title=dBc}} |
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'''dBc''', decibels relative to the carrier, expresses in [[decibels]] the power ratio of a signal to a carrier signal. For example, [[phase noise]] is expressed in dBc/[[Hertz|Hz]] at a given [[frequency]] offset from the carrier. |
'''dBc''', decibels relative to the carrier, expresses in [[decibels]] the power ratio of a signal to a carrier signal. For example, [[phase noise]] is expressed in dBc/[[Hertz|Hz]] at a given [[frequency]] offset from the carrier. dBc can also be used as a measurement of spurious free [[dynamic range]] (SFDR) between the desired signal and unwanted spurious outputs resulting from the use of a [[digital-to-analog converter]] or [[frequency mixer]]. |
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Since the signal in question is usually weaker than the carrier, dBc values are often negative. |
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Although the [[decibel]] (dB) is permitted for use alongside [[SI]] units, the dBc is not.<ref>[http://physics.nist.gov/Pubs/pdf.html Taylor 1995, Guide for the Use of the International System of Units (SI), NIST Special Publication SP811]</ref> |
Although the [[decibel]] (dB) is permitted for use alongside [[SI]] units, the dBc is not.<ref>[http://physics.nist.gov/Pubs/pdf.html Taylor 1995, Guide for the Use of the International System of Units (SI), NIST Special Publication SP811]</ref> |
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Revision as of 04:11, 15 October 2007
dBc, decibels relative to the carrier, expresses in decibels the power ratio of a signal to a carrier signal. For example, phase noise is expressed in dBc/Hz at a given frequency offset from the carrier. dBc can also be used as a measurement of spurious free dynamic range (SFDR) between the desired signal and unwanted spurious outputs resulting from the use of a digital-to-analog converter or frequency mixer.
Since the signal in question is usually weaker than the carrier, dBc values are often negative.
Although the decibel (dB) is permitted for use alongside SI units, the dBc is not.[1]
References
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