HP 70427A User Manual page 147

Table 4-3
NOTE
Source Operation
Phase Noise Measurement With PLL
•
Voltage Tuning Range of VCO: See table below.
•
VCO Tune-port Input Resistance: 1 M
•
Phase Detector: Internal Phase Detector - 1.2 GHz to 18 GHz
VCO Tuning Constant and Range vs. HP 70428A Tuning Sensitivity
Tune Tuning Constant
Sens
–6
× Carrier
.05 0.15×10
ppm/V Freq
–6
× Carrier Freq
1.0 10
ppm/V
–5
2 ×10 × Carrier
20
ppm/V Freq
Specify a Calibration Process
•
Determining PHASE DETECTOR CONSTANT: Measure the Detector
Constant.
•
Determining VCO TUNING CONSTANT: Measure the VCO Tuning
Constant.
Specify the Control of Signal Sources
•
DUT: USER'S SOURCE, MANUAL CONTROL
•
REF SOURCE: USER'S SOURCE, MANUAL CONTROL
Step 7 - Start a new measurement
If the HP 70428A K01 Tune Voltage Supply is being used, adjust the pot for
minimum, and turn it on at this time.
Step 8 - Verify beatnote and proceed
If the HP 70428A is being tuned use the HP 70428A K01 to adjust its
frequency for a beatnote within 5% of the peak tuning range.
The HP 70428A K01 consists of a 9 V battery and a ten-turn pot.
4-6 HP 70427A/HP 70428A User's Guide
Ω
Tuning
Range
0.2 V
5V
5V