Chapter 4
225
Calibration
Vector-Mixer Calibration
4. Cal
ibra
tion
analyzer on which vector calibration has been performed and then connect an OPEN,
SHORT or LOAD standard to the end of the IF filter to start reflection measurement. The
signals measured at the test port include the reflection signal from the mixer’s RF port, the
IF signal (IF+) converted by the mixer and then reflected by the IF filter, and the IF signal
(IF-) passing through the IF filer and then reflected by the calibration standard.
The characteristics of the calibration mixer can be described in a 1-port error model, and
each error item can be determined from
Γ
O
,
Γ
S
, and
Γ
L
, which are obtained in the
reflection measurement of individual standards.
Figure 4-66
Characteristics evaluation of calibration mixer (with IF filter)
NOTE
The calibration mixer must be reciprocal. The term “reciprocal” means the magnitude and
phase of the conversion loss are equal both in the forward and reverse directions. The
forward conversion loss occurs during the measurement of the output signal at the IF port
while inputting measurement signals into the RF port. In contrast, the reverse conversion
loss occurs during measurement of the output signal at the RF port while inputting
measurement signals into the IF port.
NOTE
For precise calibration, the conversion loss in each direction must be less than 10 dB using
a calibration mixer and IF filter in combination. Exceeding 15 dB of the conversion loss in
any direction may deteriorate the calibration accuracy significantly.
Characterizing procedure for calibration mixer (with IF filter)
The E5070B/E5071B has a pre-installed VBA macro (Vector Mixer Characterization) for
characterizing the calibration mixer with an IF filter.
Storage Folder
VBA Macro (Project Name)
D:\Agilent
MixerCharacterization.vba
Summary of Contents for E5070B
Page 6: ......
Page 30: ...24 Contents ...
Page 34: ...28 Chapter1 Precautions Before contacting us ...
Page 286: ...280 Chapter6 Data Analysis Using the Equation Editor ...
Page 430: ...424 Chapter12 Optimizing Measurements Performing a Segment by Segment Sweep segment sweep ...
Page 538: ...532 Chapter15 Measurement Examples Executing Power Calibration ...
Page 634: ...628 AppendixB Troubleshooting Warning Message ...
Page 732: ...726 AppendixD Softkey Functions Trigger Menu ...
Page 740: ...734 AppendixE General Principles of Operation Data Processing ...
Page 760: ...754 AppendixF Replacing the 8753ES with the E5070B E5071B Comparing Functions ...
