Hello,
I implemented a fully-differential RF down-conversion mixer on-chip. I have differential RF input signals, differential LO input signals, and differential IF output signals. So I have 6 PADs and I didn’t implement balun circuit to convert single-ended to differential due to area limitation.
My questions are:
* What should I suppose to do to measure such a design?
* Is there any method for measuring differential signals?
* What kind of equipment should I use?
OR
* Should I implement on PCB balun circuit?
Note: We just have a 4 channels vector network analyzer.
Thanks in advance and I really appreciate your help.
Best Regards,
You can measure nonlinearity of the transfer function for each mixer by using one and two harmonic signals. After this expediently compare two destorted signals.
Dear Thomas,
Thanks for your detail explanation. I got your point and I will try to find the differential probe.
Dear Dr. Mihail,
Thanks for your reply.
I just have 1 mixer that has 4 inputs (RF+, RF-, LO+, and LO-) and 2 outputs (IF+ and IF-).
To apply two-tone measurement I need to convert the single-ended signals (RF and LO) to differential signals (RF+, RF-, LO+, and LO-).
So how can I measure the nonlinearity by using single-ended probe???
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