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Frequency synthesizer circuit design

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khungbopro

khungbopro

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Hi,
I want to design a Frequency synthesizer circuit, freq_center=4900MHz
I recommend using ADF4108 IC
Could you help me design schematic of this circuit.
Thanks in advance :-D
 

have you actually googled for a datasheet for the ADF4108 ?

It would be the first obvious place to start. Most datasheets have application circuits and PCB layouts

Dave
 
There is something wrong. I tried to set in ADISimPLL (ver. 3.43) your PLL (ADF4108) and the frequency you want to generate (I don't know if you just need a single frequency or you have a range), that is 4900 MHz. Searching the VCO in the supplied library I can see 6 parts:

485515SM5 from APA Wireless
ROS-5150-11 from Mini-Ciruits
ZX95-5150-S+ from Mini-Ciruits
DCR050063 from Synergy
UMZ-189-A16 from UMC
SMV5000L from ZComm

In ADISimPLL, when you are in the box "VCO selection" on the right you can see "Search type", just click on "Search VCO Library".
 
I used 50MHz oscillator to make Reference for PLL. But, I didn't use a capacitor AC coupled between Ref and PLL. Please help me to know in detail the influence of DC current to the output frequency !?!
Thank you!
 

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