Analog Devices Case (SR-232647-J5Y3G6)

VCO Test Setup

Fig1. Test setup

Fig2. Programmable power supply used to provide V tune (Tunable DC voltage) (PPD3003-S)

Fig3. GWINSTEK power supply used to provide fixed 5V (GPE-4323)

Fig4. Spectrum Analyzer (SA) to measure the output frequency (USB-SA124B signal Hound)

Plz suggest where to upload Test setup file and observed test results as we are unable to see any upload options on portal.

Your early reply will be highly appreciated as our project is critical to be completed at the earliest.

Hi I am not seeing any figures or data for your specific concern.  Can you provide the frequency and specific measured levels you are seeing?  How much loss does your cable have at the frequency you are testing?

Dear Chris:PFA the VCO test report after your comments.
A low ripple and noise dc source is used 
https://www.aplab.com/images/stories/pdfs/PPD3003S%20-%20Programmable%203%20Channel%20Power%20Supply.pdf
Still facing the issue of power fluctuations and spurs, respective
spectrum plots are attached in the file.

Hi,  Sorry just back from the holiday break.  It looks like that supply is better than the previous supply but is still inducing spurious content.  The ppd3003 specs indicate 3mvpp ripple.  However, the LT3045, or LT3042 can suppress supply ripple 50 to 100dB depending on the frequency offset.  This would put the supply ripple down to the single digit uVpp range (1000x improvement), which would improve the spurious content great.