External 90º Hybrid for HMC525ALC4

Question

Hi, I'm sorry if my question is too basic. I want to build FMCW radar with range 4-7GHz. Now I'm looking for the downconverter with the expected IF signal (LO-RF) is at 10-100 kHz. And I found HMC525ALC4. 
 But based on its datasheet, it mentions about external 90&ordm; Hybrid. Is it compulsory for me if I just need one IF port? What happen if I terminate one port with 50ohm dummy load and use another IF port directly without external 90&ordm; Hybrid? 
 Or, do you have any recommendation components either for the 90&ordm; Hybrid or the downconverter mixer? 
 
 Thanks, 
 Ghozali Hadi

ADIApproved · Accepted Answer

Hi Ghozal, 
 Yes you could 50 ohm terminate an IF port and use the other IF port... Or better you could use any double balanced mixer from our portfolio: 
 www.analog.com/.../10711 
 Thanks, 
 Taz)

ADIApproved · Answer

Hi, 
 Using only one IF port without the hybrid would mean that you would have 3dB additional conversion loss. The hybrid is needed for image rejection. However you would lose the image rejection capability if using only one IF port. 
 I think for your application these mixers would fit better: 
 HMC1048A (only for downconversion) 
 HMC129A. 
 HMC218B, 
 HMC219B, 
 HMC557A, 
 HMC787A, 
 LTC5548, 
 LTC5552. 
 Thanks, 
 Taz

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External 90º Hybrid for HMC525ALC4