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Step 4 - Measure Downconverter phase noise at 2.4 GHz
1. Enter source and interface parameters
Carrier frequency: 2.4 GHz
2. Define graph of results
3. Enter spec lines
Table 14-15
Spec Lines: Downconverter at 2.4 GHz (Test 6)
Point
1
2
3
4
5
6
7
8
9
10
11
12
The
Spec Lines
offsets from the result table for the offset frequency and the max spec from
the result table for the amplitude. Phase noise specs are entered in order, but
the spurious specs must be entered in reverse order with an extra point at 40
MHz.
4. Set the reference source and DUT tuning sensitivity to 0.05 ppm/V
a. Press the
b. Press the
c. Press the
d. If necessary, make the other module active by pressing the
key followed by the
the module's softkeys.
Test 6 - Phase Noise and Spurs of Downconverter
•
VCO Tuning constant: 48 kHz/Volt
•
Voltage tuning range of VCO: 2.0 V
•
Title: Downconverter at 2.4 GHz, 0.05 ppm/V tuning.
Offset Frequency (Hz)
1
10
100
1E3
10E3
100E3
1E6
40E6
40E6
10E6
1E3
100
softkey is under the results graph definition menu. Use the
softkey.
Ref Chain
softkey.
Tune Sens
softkey.
0.05 ppm/V
NEXT INSTR
HP 70427A/HP 70428A User's Guide 14-43
Performance Tests
Amplitude
(dBc/Hz)
–45
–75
–95
–123
–133
–140
–140
–140
–65
–65
–65
–50
softkey. Press the
MENU
DISPLAY
to display
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