[SI-LIST] PCB too small for adequate plane capacitance
- From: "Peter Baxter" <peter.baxter@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 8 Jan 2004 22:29:38 +1100
while the si-list is talking about power distribution...
I have a 2" by 1" PCB that contains one IC that drives a whole set of series
terminated transmission lines. It always clocks data at 200MHz. Due to the
impedance of the transmission lines, the current required by the driver IC
requires there to be about 10-14 GND/POWER/GND layers, along with low
inductance IDC caps (for a flat impedance out to 1GHz). Buried Capacitance
may need to be considered, however it has been suggested that it be avoided
if possible.
My basic problem is that the housing limits the size of the PCB, which
restricts the power plane area.
Is there an alternative approach that I ought to consider, or have I
approached it the only practical way.
Cheers,
Peter Baxter
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