I want to simultaneous input IF signal to ADL5380 and ADL5387. How do I design signal chain is right ? Can use RF switch or RF spliter to design this function?
Hi, a nonreflective switch should be fine to realize your function, but if you want to have simultaneous input, a power divider could be a good option.
As Peng had mentioned you can use a power splitter or switch but it depends on your application and design. When using a power splitter the RF signal will appear at both the ADL5380 and ADL5387. As a result of this both parts will be switching at the same time and I do not believe this is your intention. I am guessing you only want one device operating at a time. The switch may be a better option however both parts will still be switch at the same time because the signal from one would leak into the other. Therefore it is very important for you to consider the isolation requirement. Additionally, I am not sure if you're aware of this but the ADL5380 uses a 1xLO while the ADL5387 is a 2xLO.
Hi Qui and Peng
I want to design 50MHz to 6GHz RF test instruments , so I will use two demodulator , the two demodulator will always power on. Thank you for your help. Thank you.
Dear Qui and Peng
Attached is the block diagram of up/down convertor we want to design.
We have some issues about the I/Q signal combine or splitter.
Because we need DC information of I/Q signal in our system requirement, we have two method for it.
One is using analog switch, we concern if there are some biggeruncertainty or distortion on analog switch to affect LO leakage, sidebandquality, etc...
Another is using lump resister splitter, we concern if there aresome interference from unused de/modulator even though no LO signal.
Could you help to what method will be better for morestability, lower distortion, correct DC signal, etc...?
Isolation, mixing products, and feedthrough are all the challenges involved in a design like the one you hope to achieve. It is very difficult for us to make recommendations if we don't have a full understanding of the design targets and specifications and this is probably proprietary information you do not want to share on a public forum. My best recommendations would be to level plan your design and put it together and try it out.
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