Isolation Example Measurements; Lo To Rf Isolation - Agilent Technologies 8753ET User Manual

Making Mixer Measurements

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.
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:
Start 10 M/
Stop 3000
Power 0 PWR RANGE MAN
This source stimulates the mixer's LO port.
3. To select a ratio B/R measurement, press:
Meas INPUT PORTS
4. Make the connections as shown in
2-44
.
Preset
M/
x1
B/R
Figure 2-33.
Figure 2-32 illustrates the signal