5 CALIBRATION AND CALIBRATION KIT
157
5.7 Vector Mixer Calibration
Vector scalar calibration is a calibration method applied for mixer measurements. This
method allows measurement of both reflection and transmission S-parameters in vector
form, including phase and group delay of transmission coefficient.
The vector mixer measurements require an additional mixer with filter, which is called
calibration mixer.
The filter separates the IF, which is the input frequency for the mixer under test:
·RF + LO
·RF – LO
·LO – RF
Both calibration mixer and mixer under test are powered from one LO.
The vector mixer measurement is a combination of a 2-port calibration and a de-
embedding function (See figure 5.21).
Figure 5.21 Vector mixer measurements
The de-embedding function requires an S-parameter file of the circuit. Acquisition of
such a file for the calibration mixer/filter pair is called vector mixer calibration.
2
-
Port Calibration
De
-
embedding
Mixer Under
Test
Mixer/Filter
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