Agilent Technologies 8719D, User Manual

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Harmonics, linearity, and spurious signals also introduce errors that are not removed by
frequency response calibration. These errors are smaller with a narrowband detection scheme,
but they may still interfere with your measurements. You should filter the IF signal to reduce
these errors as much as possible.
Correct filtering between the mixer’s IF port and the receiver’s input port can eliminate
unwanted mixing and leakage signals from entering the analyzer’s receiver. Figure 6-88 shows
a plot of mixer conversion loss when proper IF was neglected.
6-88.
Example of Conversion Loss versus Output Frequency Without Correct
IF Signal Filtering
6-89 shows the same mixer’s conversion loss with the addition of a low pass at the
mixer’s IF port.
i
Figure 6-89.
Example of Conversion Loss versus Output Frequency With Correct
Filtering and Attenuation at Mixer Ports
Application and Operation Concepts