Coupling capacitor

[jtxu]

Hi
I am designing a rf board amplifier for 1,1Ghz with BGA2869,115 (attached)
What should be the Coupling capacitors of RF_IN and RF_OUT for 1,1GHz? C1 and C2
for 1090 Mhz ~= 1.1Ghz



Thank you

 

[albbg]

You can choose two capacitors with a SRF of about 1GHz, in order to have the minimum series impedance. Roughly the value should be around 39pF.

 

[jtxu]

Thank you very much for the information. What is the value for 162Mhz?
Where can i find coupling capacitors? Silicon RF capacitors?
Are these capacitors specific for RF?

Thank you very much again

 

[FvM]

Did you review the application example in datasheet? They use 470 pF 0603 chip for frequencies down to 100 MHz. I would prefer 0402 size due to lower series inductance.

 

[vfone]

Use SimSurfing tool from Murata, and this will give an idea what capacitor value and size to chose for minimum reactance at desired frequency.

SimSurfing

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