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, n discrete electrical capacitors (202), and n electrical resistance elements (218,224) , where n ≥2. Each of the n discrete electrical resistance elements (218,224) is coupled in series with a corresponding one of the n discrete electrical capacitors (202) between the planar conductors (204,206) . The n capacitors (202) have substantially the same capacitance C, mounted resistance Rm mounted inductance Lm, and mounted resonant frequency fm-res. The mounted resistance Rm of each of the n capacitors (202) includes an electrical resistance of the corresponding electrical resistance element (218,224). The electrical power distribution structure (203) achieves an electrical impedance Z at the resonant frequency fm-res of the capacitors (202). The mounted resistance Rm of each of the n capacitors (202) is substantially equal to (n.Z). The mounted inductance Lm of each of the n capacitors (202) is less than or equal (0.2.n.ν0.h), where ν0 is the permeability of free space, and h is a distance between the planar conductors (206,206).