We measured a channel isolation between channels in a single AD9361 to be around 60dB. Any suggestions on how to improve this?
Asked by Tom F
Which channels and at what frequency did you do this measurement at?
We used a simple SMC cable loopback from TX1A to RX2A to make the measurements. We measured at 100MHz, 3GHz, and 5.95GHz. Best case channel isolation was 60dB and work case was about 55dB. We're assuming the range is 55-60dB over the full bandwidth.
I'm still hoping for a response
How much improvement are you looking for?
The isolation is determined by the board, structures on the board and the part itself.
I think that the bottleneck is the part itself and the structures in its immediate vicinity.
We'd love to have 100dB of channel isolation, but that doesn't seem possible without using two chips. So, my question is, does the 60dB channel isolation number we are measuring seem correct? Since no one has refuted this, I'm guessing 60dB is the best case. However, I'd like to get confirmation of this.
Yes, your measurement does seem correct.
Could you please explain the set-up, how did you make TX to RX port isolation measurement on AD9361 Eval Board.
We will follow this discussion at https://ez.analog.com/thread/87186
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