Spent 2 hours to solder the Gilbert cell active mixer board, bias current is selected in 1.8mA at each of the output loading resistors, and -20dbm for both RF and LO input, the result was disappointing. There are so many spurious signal product. The spurious signal product would be fewer for -30dbm input, but obvious the dynamic range is not enough.
-30dbm input power for RF and LO
-20dbm input power for RF and LO
RF/LO on the left side and output on the right side
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