HP 8642A - Page 289

Model 8642A/B
Performance Tests
PERFORMANCE TESTS
4-15. SSB PHASE NOISE TEST
SPECIFICATION:
DESCRIPTION:
Performance Limits
Electrical Characteristics
20 kHz Offset
200 kHz Offset
Conditions
Residual SSB Phase
-125 dBc
-134 dBc
band 10
Noise
in 1 Hz
-134 dBc -143 dBc
9
Bandwidth
-137 dBc
-144 dBc
8
-141 dBc
-144 dBc
7
-144 dBc -145 dBc
6
-145 dBc
-145 dBc
5
-146 dBc
-147 dBc
4
-147 dBc -148 dBc
3
-148 dBc -149 dBc
2
-137 dBc
-138 dBc
1
-125 dBc
-137 dBc
HET
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 20kHz.
OSCILLOSCOP~~
o 0 0 I
10
10 MHz EXT
OUTPUT REF
SPECTRUM
[] 0 n nn nnnnn Don [J
o 0 ~o~ §§ §§§§§ 0 ~
ANALYZER
'--
INPUT
HP
8642A1B
AF
INPUT
SYNTHESIZED
OUTPUT
SIGNAL
GENERATOR
~
MIXER ~L
r
OUT
I
1 MHz I
IN
LOW-NOISE AMP
LPF
I
I
Figure 4-11. SSE Phase Noise Test Setup
4-39