ACWWong
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why do you need to probe LO ? don't you have an oscillator on the chip ?
if you do only have 1 probe, what you suggest seems reasonable, although i'd also look at G,IB,QB,G to confirm the result and G,I,IB,G and G,Q,QB,G to get the most information. Also you might like to measure the mismatch using a VSA with IQ inputs or similar rather than a scope to get perhaps better phase mismatch accuracy numbers.
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