Atec HP-Agilent-8643A-44B-64A-65AB - Manual (Page 5)

5
Typical performance, for
applications that push
specifications
SSB phase noise
SSB phase noise is an important specifica-
tion of a signal generator if it is to be used
for measuring the adjacent channel selec-
tivity of a receiver. If the phase noise of the
signal generator is too high at frequency
offsets equal to the channel spacing, the
test results might indicate a failure of the
receiver when it is actually functioning
properly. For a receiver with <90 dB of
selectivity the 8643A is recommended. If
the selectivity is
≥90 dB, the 8644B (or
8664A with Option 004, or 8665A/B
Option 004) is recommended.
Output level accuracy
Output level accuracy is a combination of
temperature variation, flatness over fre-
quency, and the signal generator’s internal
attenuator and detector accuracies. The
graph represents worst case output level
accuracy of a sampling of 8665Bs. All of
these units fall within the shaded area.
RF leakage
Due to radios becoming more sensitive
and operating at higher frequencies, the
traditional two-turn loop measurement of
RF leakage has become inadequate. To
overcome the shortcomings of the two-
turn loop, Agilent has developed a new
measurement technique using resonant
dipole antennas, which is 20-25 dB more
sensitive than the two-turn loop method.
Agilent has been able to reduce the level
of radiated emissions in its newer signal
generators through innovative design and
packaging. Understanding that not all
applications require the lowest possible
emissions, Option 010 is available on all of
these performance signal generators.
Typical SSB phase noise and spurs at 1 GHZ
8664A 8665A/B
standard
Option 004
-60
-80
-100
-120
-140
-160
10 100 1K 10K 100K 1M 10M
SSB phase noise (dBc/Hz)
(f) [dBc/Hz] vs. f[Hz]
Typical SSB phase noise and spurs at 1 GHZ
8643A
8644B
-60
-80
-100
-120
-140
-160
10 100 1K 10K 100K 1M 10M 40M
SSB phase noise (dBc/Hz)
(f) [dBc/Hz] vs. f[Hz]
Typical output level accuracy for the 8665B at - 115 dBm
Specification
Carrier frequency (MHz)
2.0
1.0
0.5
-0.5
-1.0
-2.0
1000 2000 3000 4000 5000 6000
8643A/44B typical leakage
Standard
Option 010
dBm
MHz
515 550 600 650 700 750 800 850 900 950 1029
-85
-90
-95
-100
-105
-110
-115
-120
-125