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Downconverter Operation
Millimeter Phase Noise Measurement - User Control
3. Press the appropriate bandwidth softkey.
Step 8 - Define the measurement
Follow the instructions in the HP 3048A manual together with the
information below.
1. Specify Measurement Source and Interface Parameters
•
Measurement type: Phase Noise using a Phase-Lock-Loop
2. Enter Source and Interface Parameters
•
Carrier Frequency: mm mixer's input frequency
•
Detector/Discr. Input Frequency: Downconverter's IF frequency
•
VCO Tuning Constant: This depends on which instrument will be tuned:
HP 70427A:
........................................LO frequency
HP 8662A/3A: EFC:.............................. 10
DC FM:
....................................................................... peak deviation
•
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:
...................................................................................... 1 M
HP 8662A/3A:EFC:............................................................................... 1 M
DC FM:
................................1k
•
Phase Detector-Internal Phase Detector. ..................5 MHz to 1600 MHz
3. Specify a Calibration Process
Determining the PHASE DETECTOR CONSTANT: Measure the
Detector Constant.
Determining the VCO TUNING CONSTANT: Measure the VCO
Tuning Constant (unless the HP 8662A/3A is being tuned with DC FM,
then it should be computed).
The Computed PLL Suppression WILL be verified.
4. Specify the Control of Signal Sources
Downcoverter: USER'S DEVICE, MANUAL CONTROL
3-10 HP 70427A/HP 70428A User's Guide
×
Tuning Sensitivity
-8 ×
Downconverter IF frequency
(HP 8662A), 600 Ω (HP 8663A)
Ω
Ω
Ω
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