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Resistivity of Copper
The
following spreadsheet is used for calculating the
DC resistance of a copper trace. You can calculate
with 1/2 ounce, 1 ounce or 2 ounce copper weight.
Enter the known average DC current, expected width
and length in column B. The spreadsheet will
output the voltage drop in column D. If you want
to know the limits on current with a given copper
weight, size and temperature then check with IPC
recomendations 275 or 2220. IPC has very nice
charts and graphs to illustrate current and
voltage limits.
Download: Tracksz
Here is a classic Lattice Diagram or what
is also known as a Bergeron Plot in an Excel
spreadsheet. This spreadsheet can easily
graph and display the ringing effect caused by
poorly terminated transmission lines.
Download it and change the source and load
impedances to get the waveforms that occur at both
the driver side and load side of the Transmission
line. There are 2 waveforms on the same
graph.
Download: Lattice Diagram
Try this sinxx
( sinx/x ) Excel spreadsheet. There are 3 popular
waveforms in this one. Sinx/x is used to
calculate bandwidth of digital waveforms
given signal rise times, frequencies and data
rates.
Download:
Sinxx |
