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NOTE
Millimeter Phase Noise Measurement System Control
•
Carrier Frequency: External mixer's input frequency (DUT frequency).
•
Detector/Discr. Input Frequency: Downconverter's IF frequency
•
VCO Tuning Constant: This depends on which instrument will be tuned:
HP 70427A:................................. carrier frequency
HP 8662A/3A: EFC: ..................... 10
DC FM:
........................................................................peak deviation
To find the IF frequency, manually enter the carrier frequency into the HP
70427A. it will calculate and display the IF frequency.
•
Center Voltage of VCO Tuning Curve:
HP 70427A:
......................................................................................... 0 V
HP 8662A/3A: ..........................................................0 V (EFC and DC FM)
•
Voltage Tuning Range of VCO:
HP 70427A:
.......................................................................................±5 V
HP 8662A/3A: ......................................................±10 V (EFC and DC FM)
•
VCO Tune-port Input Resistance:
HP 70427A:
.......................................................................................1M
HP 8662A/3A:EFC .................................................................................1M
HP 8662A: DC FM .................................................................................. 1k
HP 8663A: DC FM ................................................................................ 600
Phase Detector-Internal Phase Detector......................... 5 MHz to 1600 MHz
4. Specify a Calibration Process
Determining PHASE DETECTOR CONSTANT: Measure the Detector
Constant.
Determining the VCO TUNING CONSTANT: Measure the VCO
Tuning Constant (unless the HP 8662/3A is being tuned with the DC
FM, then it should be computed).
The Computed PLL Suppression WILL be verified.
5. Specify the Control of Signal Sources
•
Downconverter: HP 70427A SYSTEM CONTROL
•
Tune Voltage: Select the instrument to be tuned.
6. Enter the downconverter parameters
•
Press the
70427A Parms
Downconverter Operation
-8 ×
Downconverter IF frequency,
softkey on the HP 3048A controller.
HP 70427A/HP 70428A User's Guide 3-27
×
Tuning Sensitivity
Ω
Ω
Ω
Ω
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