Accuracy Considerations; Mixer Parameters - Agilent Technologies 8719D User Manual

Mixer Parameters That lbu Can Measure
and RF feedthru.
Reflection
characteristics
n
Output power.
n
Other parameters of concern are isolation terms, including LO to RF isolation and LO to IF
n
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 mixing 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 first down-conversion stage. 'Ib ensure
that measurement accuracy is not degraded, you must illter certain frequencies or avoid them
by frequency selection. If you place attenuators at all mixer ports, you can reduce mismatch
uncertainties.
Figure 6-86. Mixer
include return loss, SWR and complex impedance.
Parameters