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ADRF6516 Noise Figure vs Cutoff Frequency

Question asked by anzo on Dec 10, 2012
Latest reply on Feb 8, 2013 by jdobler



this is my first post, so hopefully it is placed where it should be.


I am measuring the ADRF6516 on the ADIs' evaluation board, and the noise figure seems to have a strong dependancy on the filter cutoff frequency, even within the passband of the filters. In particular, I get a 9.5dB noise figure at 10MHz with 31MHz filter cutoff frequency, but it degrades progressively to 16.7dB at fc=11MHz.


Is this normal?