Once you hit the gigahertz range, capacitance between traces can become a huge problem
too. You can get weird things resonating, phase noise(IIRC) and the dreaded crosstalk.
I'm no expert on microwave, mind. I spend most of my efforts right now around 2
meters.
Frankly, both my father and I were astounded that they made a 1GHz chip work. We thought
it would never happen...
Sent from my iPhone
On 2012-08-12, at 7:00 PM, Dave McGuire <mcguire at neurotica.com> wrote:
On 08/12/2012 06:49 PM, Dave wrote:
These days you also get various flavours of SATA
and SAS, Fibre Channel and
FireWire. In fact as speeds rise serial interfaces tend to become the
interfacee of choice.
Indeed, PCIe is serial. The amazing advancements in LVD signaling and
high-speed PCB design have given us a lot of interesting new
capabilities. The PCI bus evolved FROM parallel TO serial to gain more
speed, whoda thunk it? ;) It turned out that, in the end, skew along
parallel buses became a bigger problem than pushing the speeds into the
GHz range.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA