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capacitors for 4.2 Ghz amplifier

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blindwidow

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Hi,

I'm designing an amplifier at 4.2 GHz using MGA-72543 amplifier chip. I need several capacitors (from 22pF to 1000pF) for biasing circuit. Can you recommend a manufacturer that will work in this band? I attach the datasheet of the chip ( it includes the biasing circuit) if needed.

Thank you,
 

Maybe I asked wrong. There are many manufacturers but in order to work at 4.2 GHz properly which serie of them should I choose? For example should I choose the one whose series resonance frequency is above 4.2GHz?

Thank you,
 

The values listed are for 1.9GHz.
C1 and C2 are blocking caps.
O/p side is RFC so these are insencitive for broad band matching.

If linear scale applied then L1 will become <2nH which has SRF >10Ghz.

First design your LNA with ideal components then transfer to practical values.
 

Murata has a useful library you can download to your PC to check capacitor/inductor values.

I d suggest to use attached freeware to get initial values, it is pretty fast, later on you can input the data into Simulation for optimization.

Cheers
 

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    blindwidow

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