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 of an electrical power distribution structure by electrically coupling multiple bypass capacitors and corresponding electrical resistance elements in series between the planar conductors. The methods include bypass capacitor selection criteria and electrical resistance determination criteria based upon simulation results. An exemplary electrical power distribution structure produced by one of the methods includes a pair of parallel planar conductors separated by a dielectric layer, n discrete electrical capacitors, and n electrical resistance elements, where n2. Each of the n discrete electrical resistance elements is coupled in series with a corresponding one of the n discrete electrical capacitors between the planar conductors. The n capacitors have substantially the same capacitance C, mounted resistance R_m, mounted inductance L_m, and mounted resonant frequency f_m-res. The mounted resistance R_m of each of the n capacitors includes an electrical resistance of the corresponding electrical resistance element. The electrical power distribution structure achieves an electrical impedance Z at the resonant frequency f_m-res of the capacitors. The mounted resistance R_m of each of the n capacitors is substantially equal to (nZ). The mounted inductance L_m of each of the n capacitors is less than or equal to (0.2n₀h), where ₀ is the permeability of free space, and h is a distance between the planar conductors.