Agilent Technologies 8753ET User Manual page 169

Network analyzers

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Table of Contents

Making Mixer Measurements

Isolation Example Measurements

8. Connect the external LO source to the mixer's LO port.

9. The measurement results show the mixer's RF feedthrough.

You may see spurious responses on the analyzer trace due to interference

caused by LO to IF leakage in the mixer. This can be reduced with averaging

or by reducing the IF bandwidth.

Figure 2-38 Example Mixer RF Feedthrough Measurement

You can measure the IF to RF isolation in a similar manner, but with the following

modiﬁcations:

• Use the analyzer source as the IF signal drive.

• View the leakage signal at the RF port.