Power distribution system for integrated circuits

Abstract

A power distribution system for integrated circuits includes methods to damp resonance between a bypass capacitor network and a power/ground cavity of the printed circuit board that (a) does not require excessive quantities of bypass/damping components or (b) does not require high plane cavity capacitance or in the alternative can insure a Q of less than 1.4 at the transition from the bypass network to the plane cavity impedance cross-over.

1 . A method for supplying power to an integrated circuit comprising:
 providing the integrated circuit;   providing a power wiring network having a via; and   providing the via with a first series of quarter-wave resonator stubs; wherein   frequencies of the first series of quarter-wave resonator stubs are selected to correspond to half wave resonances of the power wiring network when the power wiring network is not compensated.   
     
     
         2 . A method according to  claim 1 , wherein impedances of the first series of quarter-wave resonator stubs are selected in linearly ascending values with frequency to minimize the negative impact of half-wave resonances that result from each of the first series of quarter-wave resonator stubs. 
     
     
         3 . A method according to  claim 1 , further comprising providing the via with a second series of quarter-wave resonator stubs selected to compensate half-wave resonances resulting from the first series of quarter-wave resonator stubs. 
     
     
         4 . A method according to  claim 1 , wherein the first series of quarter-wave resonator stubs is provided in an interposer. 
     
     
         5 . A method according to  claim 1 , wherein the first series of quarter-wave resonator stubs is provided in an interposer with wings. 
     
     
         6 . A method according to  claim 1 , wherein the first series of quarter-wave resonator stubs and the integrated circuit are provided in or on a single package. 
     
     
         7 . A method according to  claim 1 , wherein the first series of quarter-wave resonator stubs is provided in a circuit board to which the integrated circuit is to be mounted. 
     
     
         8 . A method for supplying power to an integrated circuit comprising:
 providing an integrated circuit;   providing a circuit board;   providing at least one discrete bypass capacitor on the circuit board; and   setting a transition frequency to a value from between about 1.65 times to about 2.2 times an NRZ bit frequency of the highest frequency noise generating source of any substantial power; wherein   the transition frequency is from the at least one discrete bypass capacitor to a capacitance within the integrated circuit or at least one planar bypass element.