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ADRF6755 IQ Inputs levels

Question asked by sailorjerry on Aug 17, 2017
Latest reply on Aug 21, 2017 by sailorjerry

I'm trying to understand what kind of inputs the ADRF6755 requires. That what the data sheet says:


The baseband inputs, QBB_P, QBB_N, IBB_P, and IBB_N, must be driven from a differential source. The nominal drive level of 0.9 V p-p

differential (450 mV p-p on each pin) should be biased to a common-mode level of 500 mV dc.


Here is how I understand it. Each individual component is biased by +500 mV and has an amplitude 450 mV p-p, so if if I difference IBB_P-IBB_N I would see 900 mV p-p with zero mean.


Here is the plot to illustrate it.


Differential inputs

Am I correct or I'm completely in the weeds?