2-45
Making Mixer Measurements (Option 089 Only)
Isolation Example Measurements
Isolation Example Measurements Isolation is the measure of signal leakage in a mixer. Feedthrough is specifically the
forward signal leakage to the IF port. High isolation means that the amount of leakage or
feedthrough between the mixer’s ports is very small. Isolation measurements do not use
the frequency offset mode. Figure 2-32 illustrates the signal flow in a mixer.
Figure 2-32 Signal Flow in a Mixer Example
LO to RF Isolation
LO to RF isolation is the amount the LO power is attenuated when it appears directly at
the RF port.
1. Initialize the analyzer by pressing .
2. To select the analyzer frequency range and source power, press:
( , 8722ES)
This source stimulates the mixer’s LO port.
3. To select a ratio B/R measurement, press:
Preset
Start 10 M/µ
Stop 3000 M/µ
Power 0
PWR RANGE MAN
x1
−10 x1
Meas
INPUT PORTS
B/R