- Source: DBc
- Source: DBC
dBc (decibels relative to the carrier) is the power ratio of a signal to a carrier signal, expressed in decibels. 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 signal converters such as a digital-to-analog converter or a frequency mixer.
If the dBc figure is positive, then the relative signal strength is greater than the carrier signal strength. If the dBc figure is negative, then the relative signal strength is less than carrier signal strength.
Although the decibel (dB) is permitted for use alongside SI units, the dBc is not.
Example
If a carrier (reference signal) has a power of
C
=
0
.
1
m
W
{\textstyle \mathrm {C} =0{.}1\,\mathrm {mW} }
, and noise signal has power of
S
=
10
μ
W
{\textstyle \mathrm {S} =10\,\mathrm {\mu W} }
.
Power of reference signal expressed in decibel is :
P
C
=
10
log
10
(
0
.
1
m
W
1
m
W
)
=
−
10
d
B
m
{\displaystyle P_{\mathrm {C} }=10\log _{10}\left({\frac {0{.}1\,\mathrm {mW} }{1\,\mathrm {mW} }}\right)=-10\,\mathrm {dBm} }
Power of noise expressed in decibel is :
P
S
=
10
log
10
(
10
μ
W
1
m
W
)
=
−
20
d
B
m
{\displaystyle P_{\mathrm {S} }=10\log _{10}\left({\frac {10\,\mathrm {\mu W} }{1\,\mathrm {mW} }}\right)=-20\,\mathrm {dBm} }
The calculation of dBc difference between noise signal and reference signal is then as follows:
P
S
−
P
C
=
−
20
d
B
m
−
(
−
10
d
B
m
)
=
−
10
d
B
c
{\displaystyle P_{\mathrm {S} }-P_{\mathrm {C} }=-20\,\mathrm {dBm} -(-10\,\mathrm {dBm} )=-10\,\mathrm {dBc} }
It is also possible to compute the dBc power of noise signal with respect to reference signal directly as logarithm of their ratio as follows:
P
S
−
P
C
=
10
log
10
(
S
C
)
=
10
log
10
(
10
μ
W
0
.
1
m
W
)
=
−
10
d
B
c
{\displaystyle P_{\mathrm {S} }-P_{\mathrm {C} }=10\log _{10}\left({\frac {\mathrm {S} }{\mathrm {C} }}\right)=10\log _{10}\left({\frac {10\,\mathrm {\mu W} }{0{.}1\,\mathrm {mW} }}\right)=-10\,\mathrm {dBc} }
.
References
External links
Encyclopedia of Laser Physics and Technology
DBC may refer to:
Database connection libraries, e.g., JDBC
CAN DBC files, standardized ASCII files defining the format and purpose of CAN bus messages
IATA code for Baicheng Chang'an Airport
dBc, decibels relative to carrier, a measurement in RF engineering
dB(C), C-weighted decibels, a loudness measurement in acoustics
DBC News, a Bangladeshi news channel
DBC Pierre (born 1961), Australian-born author
Dead Brain Cells, a Canadian thrash metal band
Design by contract, a methodology for designing computer software
Detroit Boat Club, a historic rowing club
Digital Broadcasting Corporation (Hong Kong), a radio broadcasting corporation
Dread Broadcasting Corporation, the UKs first black music radio station
The Devastating Beat Creator, stage name of Martin Nemley, a member of the American hip hop band Stetsasonic
Direct Bonded Copper, a power electronic substrate
Direct-buried cable, a kind of electrical cable
See also
DBC 1012, a computer produced by Teradata Corporation in the early 1980s
DBC1, a human protein
Deleted in Breast Cancer 1, a human protein
DBCS (disambiguation)
Kata Kunci Pencarian:
- DBC Pierre
- Vernon God Little
- Permutasi
- SMA Santo Aloysius Bandung
- Fakultas Hukum Universitas Indonesia
- Gregorius dari Tours
- SMA Negeri 5 Malang
- Kotlin (bahasa pemrograman)
- Penghargaan Booker
- Thrash metal
- DBc
- Design by contract
- DBC Pierre
- DBC
- DBC Houthalen
- DBC News
- Dead Brain Cells
- Power electronic substrate
- CAN bus
- DBC 1012
