ACCEPTANCE TESTING
6-28
SSB phase noise
Specification
SSB phase noise :
Less than
−
116 dBc /Hz (typically -122 dBc/Hz) at an offset of 20 kHz
from a carrier frequency
Digital mode:
Less than
−
108 dBc/Hz at an offset of 20 kHz.
Test equipment
Description Minimum
specification Example
Phase noise
measuring device
Capable of measuring phase noise of
−
116 dBc
Aeroflex L262
Signal generator
SSB phase noise at least
−
116 dBc at 20 kHz offset
from a 470 MHz carrier signal
Aeroflex 2040
Spectrum analyzer
Capable of measuring 100 Hz to 100 kHz
Aeroflex 2382
Test procedures
C0320
RF OUTPUT
RF OUTPUT
UUT
2040 Signal Generator
Mixer
Phase Noise
Measuring
Device
RF
RF
OUTPUT
TUNE
INPUT
EXT
MOD 1
2382/2380
Spectrum Analyzer and Display
Fig. 6-14 SSB phase noise test set-up
(1) Connect the test equipment as shown in Fig. 6-14.
(2) Set the UUT to
[Carrier Freq.]
470 MHz
[RF Level]
7 dBm, modulation to OFF.
(3) Using the phase noise measuring device, measure SSB phase noise at a 20 kHz offset which
must be less than
−
116 dBc.
(4) Set the UUT to p6 dBm in Digital Modulation Mode, Test Tones selected with the I
and Q inputs set to 0 mV and DC offset set to 500 mV as follows:-
[RF Level]
6 dBm [UTIL]
[Mod'n. Mode][Digital]
[SIG GEN]
[Mod'n System]
[Select Mod. Type][Test Tones][EXIT]
[I Ampli.]
0 mV
[Q Ampli.]
0 mV
[I DC Offset]
500 mV
(5) Using the phase noise measuring device, measure SSB phase noise at a 20 kHz offset, which
must be less than -108 dBc.