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      Embedded Resistors

             The resistance substrates comes in different types of value sheets
             Main manufactures are : Ohmega, Rohm, Shipely

Sheet Resistivity
Ohmega-Ply® Film Average Thickness
Material Tolerance
10Ω/ϒ
1.00 Micron
3%
25Ω/ϒ
0.40 Micron
5%
50Ω/ϒ
0.20 Micron
5%
100Ω/ϒ
0.10 Micron
5%
250Ω/ϒ
0.05 Micron
10%


      Resistor Types


             Bar Type
                       • Multiple Squares (N≥1)                                                                                                 • Partial Squares (N<1)










             Meander Type
                       • Basically, a meander resisitor can be considered as a bar resistor
                         with the exception of the corner squares (right-angle bends).
                         Due to the change in current density at right angle path,
                         the effective number of square is 0.56.




                                                                                                                                                       e.g., sheet resistance (Rs) = 100Ω/ϒ
                                                                                                                                                                            No. of squares = 37
                                                                                                                                                               No. of corner squares = 16
                                                                                                                                                  Total No. of effective squares = 37+(16 x 0.56)
                                                                                                                                                                                                        = 45.9
                                                                                                                                                                                                        ≈ 46
                                                                                                                                                                       Resistance value = 46 x 100
                                                                                                                                                                                                        = 4.6K



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