My knotty question concerns the possible application of transmission
line
theory to this domain of SHORT interconnect length in relation to the
rise
time, unterminatable load, and 'current source' complex Z driver.
This configuration may not be the optimum for my requirements and am
looking
to optimize both the single-layer interconnect Zo and the driver(which
must end
up to be a current driver after the rise/fall time transitions).
One as aspect is reflections and the other is optimum current rise time
in
the head.
Reflections:
Since I will have two down and back reflections from my 'high impedance'
load (during the rise/fall times)with diminishing intensity, i probably
will not
even see reflection effects??? (so i don't need be concerned about
matching?)
Fast current transmission:
Will classical transmission line theory apply here - to the rise/fall
domain?
'If source or load is terminated in Zo of the line, a lossless line
looks
purely resistive'. Therefore, make the current driver look like Zo
during
the transitions,and like a current source thereafter.
Is this 'hybrid' approach the optimum ??
Am i now not concerned so much about longer interconnects,
since i am matched during the critical timeframe??
Thanks and regards,
Greg Kimball
Applications Engr
TI Storage Products GP
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