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Mixer Isolation-LO to RF,LO to IF,RF to IF Isolation

This page of mixer isolation between ports covers LO to RF isolation, LO to IF isolation and RF to IF isolation.

Isolation: This term refers to ratio of applied power at one port of the mixer with the power output derived from another port of it. Both the input power and output power will have same frequency. As isolation is ratio of two powers; it is measured in dB.

There are three ports of a mixer viz. LO (Local Oscillator), RF (Radio Frequency) and IF (Intermediate Frequency). As we know mixer mixes two input frequencies and produces sum and difference of these input frequencies. Based on requirement either sum or difference part is extracted using appropriate filter and utilized.
Refer RF Mixer tutorial for more information.


rf mixer

LO to RF isolation:
It is degree of attenuation incurred by LO signal while travelling from LO port to RF port. It is measured at RF port when IF port is terminated with required impedance termination.

LO to IF isolation:
It is degree of attenuation incurred by LO signal while travelling from LO port to IF port. It is measured at IF port when RF port is terminated with required impedance termination.

RF to IF isolation:
It is degree of attenuation incurred by RF signal while travelling from RF port to IF port. It is measured at IF port when LO port is terminated with required impedance termination.

The other terms such as RF to LO isolation, IF to LO isolation and IF to RF isolation are equivalent to LO to RF isolation, LO to IF isolation and RF to IF isolation respectivey. These are used with double balanced mixer type.

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