Can swap RF pin and Lo pin for a mixer like ADL5801?
It depends on your application but probably not. The IF output is a linear translation of the RF input and preserves the amplitude and phase information of the RF signal at the IF output. This is not true for the LO input. First, for proper operation the LO signal needs to be fairly large (-10dBm to +10dBm). This large LO is internally limited inside the mixer which eliminates the amplitude information. So only the phase information on the LO is translated onto the IF output. If you drive the LO with a weaker signal (say around -25dBm) then the IF output will be a linear translation of the LO but the gain will be very low and the noise figure and linearity will be very poor.
Thank you so much for answering me.
When I was tring to build a front end, I met some problem when selecting mixer or downconverter. I searched some famous microwave company, found some similar devices which confused me
1. I want to use hybrid between LO and mixer, but some devices integrated hybrid into the downconverter but is between RF and mixer.like Hittite HMC951, HMC908 etc.
2. some devices like HMC908, etc., have maximum RF input power less than 5dBm, or even 0dBm, I want to add a LNA before RF input, but cannot find proper limiter to protect the receiving unit, becase most RF power limiters have the threshold larger than 7dBm.
That is why I try to swap the pins.
I tried to find some similar ones in analog, so I want first to clear my confusion.
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