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NOTE
Phase Noise Measurement <26.5 GHz System Control
3. Enter Source and Interface Parameters
•
Carrier Frequency: Downconverter's input frequency
•
Detector/Disc. 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: ............................................................................. 3Hz/v
DC FM: ...............................................................peak deviation
•
Center Voltage of VCO Tuning Curve:
HP 70427A:
.......................................................................................... 0V
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: ............................................................................... EFC1M
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 8662A/3A is being tuned with the DC
FM, then it should be computed).
The Computed PLL Suppression WILL be verified.
5. Enter the downconverter parameters
1. Press the
Source Contro
Press the
70427A Parms s
The Up/Down arrow keys select the parameter, and the Left/Right arrow
keys select the parameters values.
•
Spectrum Analyzer View: IF
l softkey
oftkey on the HP 3048A controller.
HP 70427A/HP 70428A User's Guide 3-23
Downconverter Operation
×
Tuning Sensitivity
Ω
Ω
Ω
Ω
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