Capacitor is a poor variant for EMI supression. It will be better to use NFA or NFL Murata EMI filters.1. For VCO supply, put a 100uF Tan Capacitor maybe better.
2. For CLK/DATA... etc, put a 100pF capacitor maybe better, this capacitor couldn't be higher than 100pF. You can try smaller value if can't lock, but have one capacitor is better than none.
3. If possible, use LDO for VCO/PLL/OpAmp respectively.
4. Avdd and Dvdd can be connected with inductance, say 1uH.
Good luck.
Also from my understanding, the reason to keep traces as short as possible for the RF signal path is mainly to minimize coupling to the power supply lines. Am I correct?
Having said that, since in the latest layout there is an unavoidable long track to Fout, should I just make the track width there equal to the 50 Ohm width computed by txline?
Thanks again for all your replies. My apologies for the multiple follow-up questions.
Hi Everyone. Happy Holidays. Just want to get some feedback regarding the board layout I made for a 7.9 GHz frequency synthesizer if I did it correctly. The board I am gonna use is a double-sided 1.6mm FR4 board which is why I decided to use microstrip transmission lines in my design.
I attached 2 board layouts along with the schematic. One board layout applied the trace width and length calculated from txline while the other board layout has the connections for the 7.9GHz signal path made as short as possible.
This is my first high-frequency board that why I hope to get some feedback to improve my design. Merry Christmas and Thanks in advance.
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