Need help with a 4-6 layer High Frequency PCB design

I am working on a PCB design for our test site, which contains 100pads and more than ten RF circuits with more than 50 RF I/Os. We have 12 types of VDD and two types of GND on this chip. I am thinking about using a 6 layer board, signal, GND1, VDD, VDD, GND2, signal. However it will be very hard to assign the layer for VDDs and to route VDD lines. This board isfor a RF chip, so that transmission lines need to be created by the signal layer and GND layer. Please give me some advices on how many layer board I should design and what each layers are for. And will it be possible to run PSpice simulations for it after the design is done? Thanks.

Allen

Reply to
oceandai
Loading thread data ...

snipped-for-privacy@yahoo.com skrev:

Hi Allen

Talk to your PCB manufacture. They can advise on the question you and tell you the price of the varied layered boards.

--
Hilsen Mikkel Lund
"Sund fornuft, har aldrig stoppet en tosse"
 Click to see the full signature
Reply to
Mikkel Lund

Hi Hilsen,

Thanks for your answer. I've just contacted the PCB manufacture, but they don't give any advices on the design issues.

Allen

Reply to
oceandai

Why have two different grounds? Why so many supplies?

What's the frequency range?

John

Reply to
John Larkin

Hi John,

There are RF circuits on the chip, such as LNA and PLL, which work at about 5GHz. To be able to power on and off each individual circuit to avid possible problems, such as oscillation, we have one power supply for each circuit. This is the reason for having so many power supplies. Any suggestions? Do you think that a four-layer PCB will be proper to realize the functions? Thanks.

Allen

Reply to
Allen

5GHz, eh!? you'll need a 4-layer laminated stack-up. Use 1/2 oz copper, Rogers 4350 on top and bottom and 2 layers of 4403 in the center. Most RF chip companies have very detailed layout guidelines on their website. Did you check their first?
Reply to
maxfoo

it

per,

ite.

Hi, I've let the "Advanced Circuits" fabricated our PCB once before, they=20 only have FR4, FR406, and IS410 for the boards, which have 1 to 8=20 layers. There is no guidelines on their website. Can you please refer=20 me some good PCB companies and websites? Also, does Rogers 4350 have=20 better high frequency performance than FR4 do? Why? Thanks.

Allen

Reply to
Allen

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.