ADDING ELECTRICAL RESISTANCE IN SERIES WITH BYPASS CAPACITORS TO ACHIEVE A DESIRED VALUE OF ELECTRICAL IMPEDANCE BETWEEN CONDUCTORS OF AN ELECTRICAL POWER DISTRIBUTION STRUCTURE

摘要

Apparatus and methods for achieving a desired value of electrical impedance between parallel planar conductors (204,206) of an electrical power distribution structure (203) by electrically coupling multiple bypass capacitors (202) and corresponding electrical resistance elements (e.g resistive vias (218,224) in series between the planar conductors (204,206). The methods include bypass capacitor selection criteria and electrical resistance determination criteria based upon simulation results. An exemplary electrical power distribution structure (203) produced by one of the methods includes a pair of parallel planar conductors (204,206) separated by a dielectric layer, in/i discrete electrical capacitors (202), and in/i electrical resistance elements (218,224) , where in/i /=2. Each of the in/i discrete electrical resistance elements (218,224) is coupled in series with a corresponding one of the in/i discrete electrical capacitors (202) between the planar conductors (204,206) . The in/i capacitors (202) have substantially the same capacitance iC/i, mounted resistance iRm/i mounted inductance iLm/i, and mounted resonant frequency ifm-res/i. The mounted resistance iRm/i of each of the in/i capacitors (202) includes an electrical resistance of the corresponding electrical resistance element (218,224). The electrical power distribution structure (203) achieves an electrical impedance iZ/i at the resonant frequency ifm-res/i of the capacitors (202). The mounted resistance iRm/i of each of the in/i capacitors (202) is substantially equal to (in.Z/i). The mounted inductance iLm/i of each of the in/i capacitors (202) is less than or equal (0.2.in. mu 0.h/i), where i mu 0/i is the permeability of free space, and ih/i is a distance between the planar conductors (206,206).