General:
Separation of one section of a system from undesired influences of
other sections.
in a Mixer:
The ratio (in dB) of the power level applied at one port of a mixer to the resulting
power level at the same frequency appearing at another port.
Commonly specified isolation parameters of mixers are:
- LO to RF port: The degree of attenuation of the LO signal measured at the
RF port with the IF port properly terminated.
- LO to IF port: The degree of attenuation of the LO signal measured at the IF
port with the RF port properly terminated.
- RF to IF port: The degree of attenuation of the RF signal measured at the IF
port with the LO port properly terminated.
For a double-balanced mixer, the inverse isolation characteristics (such as RF
to LO, IF to LO, and IF to RF) are essentially equivalent to the forward isolation
characteristics.
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