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Query about HMC1041LC4 as IRM with high side injection

Question asked by Kris1954 on May 8, 2015
Latest reply on May 15, 2015 by Assaf

I am planning to use the HMC1041LC4 as an image reject mixer  with high side injection(LO freq > RF freq). The LO/RF is in 17-18 GHz range and IF is in the 70-80 MHz range.What is the correct way to to to connect the two IF outputs to the external hybrid achieve the image rejection? I have connected IF1 and IF2 to direct port and 90 deg coupled port respectively with the IF signal to be processed at the input port and the isolated port carrying the image signal 50 ohm terminated. Is this the correct way or is it the other way around? also, how good should the amplitude and phase match characteristics of the external hybrid be to achieve 20 dB image rejection at my specified frequencies?

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