4-15. Ssb Phase Noise Test - HP 8642A Operating Manual

Model 8642A/B
Performance Tests
PERFORMANCE TESTS
4-15. SSB PHASE NOISE TEST
SPECIFICATION:
Electrical Characteristics
Residual SSB Phase
Noise in 1 Hz
Bandwidth
Performance Limits
20 kHz Offset
-125 dBc
-134 dBc
-137 dBc
-141 dBc
-144 dBc
-145 dBc
-146 dBc
-147 dBc
-148 dBc
- 1 3 7 dBc
-125 dBc
200 kHz Offset
-134 dBc
- 1 4 3 dBc
- 1 4 4 dBc
- 1 4 4 dBc
-145 dBc
-145 dBc
-147 dBc
-148 dBc
-149 dBc
-138 dBc
-137 dBc
Conditions
band 10
9
8
7
6
5
4
3
2
1
HET
DESCRIPTION:
SSB phase noise is measured by mixing the RF output of the HP 8642 and
its 10 MHz reference signal in a double balanced mixer to eliminate the
carrier and translate the noise spectrum down to a low frequency where it
can be viewed on a high resolution spectrum analyzer. The 10 MHz
reference output from the HP 8642's rear panel is used as the LO input for
the mixer. The HP 8642's output is set to 10 MHz and is used as the RF
input to the mixer. The output of the mixer is viewed on a spectrum
analyzer at 20 kHz.
OSCILLOSCOPE □ □ c ; □□ a n a n a an
□ □
□ c i □ □ D D D D D /—\ □
o < - > □□□■ aa n n n D D v_/ u '
HP 8642A/B
SYNTHESIZED
SIGNAL
GENERATOR
10 MHz
OUTPUT
EXT
P.EF
HF
OUTPUT
•- MIXER
R L
1 MHz
LPF
SPECTRUM
ANALYZER
LOW-NOISE AMP
Figure 4-11. SSB Phase Noise Test Setup
4-39