Isolation Example Measurements; Lo To Rf Isolation - Agilent Technologies 8719ES User Manual

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 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:
Start 10 M/µ
Stop 3000
PWR RANGE MAN
Power 0
This source stimulates the mixer's LO port.
3. To select a ratio B/R measurement, press:
Meas INPUT PORTS
Figure 2-32 illustrates the signal flow in a mixer.
Preset
M/µ
x1
B/R
Making Mixer Measurements (Option 089 Only)
Isolation Example Measurements
.
−10
( , 8722ES)
x1
2- 45