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Most suitable probe to measure cmos signal noise

Question asked by agaurav on Jul 12, 2011
Latest reply on Jul 14, 2011 by agaurav
Could somebody let me know which will be the best probe to measure phase noise of a CMOS signal in range of 1MHz to 50 MHz, with peak-to-peak swing of 3.3V
The phase noise measurement kit which I use is E5052B. So, it has to be an active probe. I have used 85024A in the past but 3.3V swing is definitely beyond the allowed limit for it, without 10:1 divider. The noise floor I need to measure is around -150 dBc levels and thats why I had to remove the 10:1 divider. Is there anything better available?

Thanks and Regards,