HP 8753E manual Mixer Parameters That You Can Measure, Accuracy Considerations

Mixer Parameters That You Can Measure

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Figure 6-88. Mixer hrameters

w Transmission characteristics include conversion loss, conversion compression, group delay, and RF feedthru.

nReflection characteristics include return loss, SWR and complex impedance.

nCharacteristics of the signal at the output port include the output power, the spurious or harmonic content of the signal, and intermodulation distortion.

nOther parameters of concern are isolation terms, including LC to RF isolation and Lo to IF isolation.

Accuracy Considerations

In mixer transmission measurements, you have RF and LO inputs and an IF output. Also emanating from the IF port are several other mlxing products of the RF and LO signals. In mixer reflection measurements, leakage signals from one mixer port propagate and appear at the other two mixer ports. These unwanted mixing products or leakage signals can cause distortion by mixing with a harmonic of the analyzer’s llrst down-conversion stage. ‘lb ensure that measurement accuracy is not degraded, you must filter certain frequencies or avoid them by frequency selection. If you place attenuators at all mixer ports, you can reduce mismatch uncertainties.

6-168 Application and Operation Concepts