Docsis Performance - Analog Devices AD9739 Manual

DOCSIS PERFORMANCE

0
–10
–20
–30
–40
–50
–60
–70
–80
–90
0 100 200 300
Figure 46. Single-Carrier DOCSIS ACLR Spectral Plot @ 91 MHz
(DOCSIS SPEC (Red Line) Is 73 dBc ; Harmonic Exception Is 63 dBc)
CENTER 95.08GHz
#RES BW 56kHz
FREQ
RMS RESULTS
OFFSET
(MHz)
CARRIER POWER
3.375
–14.51dBm/
6.375
6MHz
Figure 47. Single-Carrier DOCSIS Close-in ACLR Plot @ 91 MHz
(Two Closest Channels)
CENTER 95.08GHz
#RES BW 30kHz
FREQ
RMS RESULTS
OFFSET
(MHz)
CARRIER POWER
3.375
–14.48dBm/
6.375
6MHz
12.00
18.00
Figure 48. Single-Carrier DOCSIS Close-in ACLR Plot @ 91 MHz
400 500 600 700 800 900
f
(MHz)
OUT
SPAN 18MHz
SWEEP 16.76ms (601pts)
VBW 500kHz
REF
LOWER UPPER
BW
(MHz) (dBc) (dBm) (dBc) (dBm)
–71.50 –86.01 –71.01 –85.52
750
5.25 –76.09 –90.59 –76.20 –90.70
SPAN 42MHz
SWEEP 136.2ms (601pts)
VBW 300kHz
REF
BW LOWER UPPER
(MHz) (dBc) (dBm) (dBc) (dBm)
750 –73.50 –86.01 –71.04 –85.52
5.25 –76.03 –90.59 –76.81 –90.70
6 –82.65 –97.13 –82.35 –96.83
6 –82.62 –97.10 –82.50 –96.98
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
1000 0
Figure 49. Single-Carrier DOCSIS ACLR Spectral Plot @ 325 MHz
(DOCSIS SPEC (Red Line) Is 73 dBc ; Harmonic Exception Is 63 dBc)
CENTER 322.35MHz
#RES BW 30kHz
RMS RESULTS
CARRIER POWER
–17.11dBm/
6MHz
Figure 50. Single-Carrier DOCSIS Close-in ACLR Plot @ 325 MHz
CENTER 322.35MHz
#RES BW 30kHz
RMS RESULTS
CARRIER POWER
–17.06dBm/
6MHz
Figure 51. Single-Carrier DOCSIS Close-in ACLR Plot @ 325 MHz
Rev. A | Page 19 of 56
100 200 300 400 500 600
f
(MHz)
OUT
SWEEP 58.4ms (601pts)
VBW 300kHz
FREQ REF
OFFSET BW LOWER
(MHz) (MHz) (dBc) (dBm)
3.375 750 –74.62 –91.73
6.375 5.25 –77.09 –94.19
(Two Closest Channels)
SWEEP 136.2ms (601pts)
VBW 300kHz
FREQ REF
OFFSET BW LOWER
(MHz) (MHz) (dBc) (dBm)
3.375 750 –72.35 –89.41
6.375 5.25 –76.50 –93.56
12.00 6 –79.37 –96.43
18.00 6 –79.38 –96.45
AD9739
700 800 900 1000
SPAN 18MHz
UPPER
(dBc) (dBm)
–74.66 –91.77
–77.55 –94.66
SPAN 42MHz
UPPER
(dBc) (dBm)
–72.58 –89.64
–77.89 –94.95
–79.00 –96.06
–79.04 –96.10