Frequency synthesizer circuit design

[khungbopro]

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

 

[albbg]

I can suggest you to use the software ADISimPLL provided by Analog Devices.

https://form.analog.com/Form_Pages/RFComms/ADISimPll.aspx

 

[davenn]

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

 

[khungbopro]

I can suggest you to use the software ADISimPLL provided by Analog Devices.

https://form.analog.com/Form_Pages/RFComms/ADISimPll.aspx

Dear albbg,
I used ADISimPLL, but this software only have 2 VCO chip! Can you suggest me to calculate frequency and choose VCO IC for my application (f_out = 4900MHz). Thanks!

 

[albbg]

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".

 

[khungbopro]

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!