AnsweredAssumed Answered

ADRF6701 Phase Noise

Question asked by rileyduan on May 16, 2016
Latest reply on Jun 6, 2016 by LKelly

we use the ADRF6701-EVALZ to meanture the Phase Noise,

1. REFIN:153.6MHz, PFD:38.4MHz

QQ图片20160517085945.jpg

2. REFIN:20MHz, PFD:40MHz

QQ图片20160517085938.jpg

3. REFIN:20MHz, PFD:20MHz

QQ图片20160517085813.jpg

Question:

1. Why the  Phase Noise changed so many when we change the REFIN ,from -10091dBc/Hz to -91dBc/Hz?

2. When we set the REFIN at 20MHz ,Why we get the 100KHz offset about -92dBc/Hz ,but the datasheet give 100KHz offsets below -110dBc/Hz ?

Outcomes