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90 180 270

Relative Time in Degrees

90 180 270

Relative Time in Degrees

Fig 1—DBM tested under manufacturer's conditions: A) LO Current; B) IF and RF port voltage.

each cycle. This corresponds to the times when the LO drive current is zero. We also see that the output waveform is flat-topped, with respect to the LO drive-current waveform. This shows that once the IF-to-RF path is conducting, driving the LO port harder only improves conduction a little bit. This also shows why you must always use a low-pass filter after this kind of DBM—to get rid of the odd harmonics.

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