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Driving AD6649 with ADL5202

Question asked by ibotopal on Oct 29, 2013
Latest reply on Oct 31, 2013 by J.Harris



I need to drive AD6649 with ADL5202 for a broadband application (20-600MHz). I have looked into the Data sheet and evaluation board examples but there are some discrepancies. Taking the examples as a guideline, I took out anti-aliasing filters, as the filtering is already done in the RF, and came up with the attached scheme.


At the input of the VGA, impedance is matched by a 1:3 transformer. At the output, Capacitors are for decoupling, 150ohm is load of ADL5202 and 25 ohm resistors are for isolation of the switching currents from the ADC. Do I miss something here?