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Coupling between IF1 and IF2 in the RF mixer

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Dines

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We are using two mixers for down converting such as IF1 and IF2. When we drive LO powers to both the mixers it starts down converting as per frequency interest.

Lets say RF1 and RF2 is our input. When we drive power RF1 to Mixer1 is perfectly down converting IF1 but at the same time we are getting IF2 with same frequency as IF1 without driving RF2 but only LO Power driving because we are driving same power to LO

Why we are getting coupling ? Is there any issue in the implementation?

Mixer PN: HMC412BMS8GE

How we can avoid leakage from mixer?
 

Some degree of crosstalk can occur through common LO port. If crosstalk is larger than specified in the datahseet, you have probably a layout problem.
 

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