4.11 Mixer Measurements
4.11.1 Mixer Measurement Methods
The Analyzer allows you to perform measurements of mixers and other frequency
translating devices using scalar and vector methods.
The scalar method allows measurement of scalar transmission S-parameters of the
frequency translating devices. Phase and group delay measurements are not accessible
in this mode. Simple measurement setup (without any additional equipment) is the
advantage of this method (See figure 4.17).
Figure 4.17 Scalar mixer measurement setup
The scalar measurement method is based on frequency offset mode. The frequency
offset mode produces frequency offset between the Analyzer test ports and described in
detain in section 4.11.2. The frequency offset mode can be combined with different
calibration methods.
When measuring the mixers by scalar method the most accurate method of calibration is
scalar mixer calibration (See section 5.6).
An easier but less accurate method is to use the absolute measurements in combination
with receiver calibration and power calibration (See sections 4.7.3, 5.5 and section 5.4).
This method often features ripple of transmission S-parameters of the mixer due to the
mixer input and output mismatch. Partially this can be compensated by matching
attenuators at input and output of the 3-10 dB mixer.
The vector method allows measurement of mixer transmission complex S-parameter
including phase and group delay. The method requires additional equipment (See figure
4.18): an external mixer with filter, which is called calibration mixer, and a LO
common for both the calibration mixer and the mixer under test.
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