Yasmeen,

Sheet resistivity (Rs) refers to the resistance of a planar
resistive layer and is generally expressed as
"ohms-per-square." There is no dimension associated with
this metric. For example, a sheet resistivity of 25
ohms/square means that any sized square shaped resistive
element created out of that layer will have a resistance of
25 ohms.

The actual resistance of a specific planar resistor is a
function of the sheet resistivity and the ratio of the
length of the resistor to its width. This ratio is sometimes
referred to as the "number-of- squares" (N).

Accordingly, the resistance in ohms of a specific planar
resistor is given by the formula:

R = Rs x N, or
R = Rs x W/L.

Please contact me if you need further information or visit
our web site at www.ohmega.com.

Dan Brandler, Ohmega Technologies, Inc.

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