Patent ID: 7019502

Claim:
A multiphase synthetic ripple voltage generator for a multiphase DC-DC regulator which includes a plurality of switching circuits each responsive to a corresponding one of a plurality of pulse width modulation (PWM) signals to switch at least one input voltage via a corresponding one of a plurality of phase nodes through a corresponding one of a plurality of output inductors to develop an output voltage at an output node, said multiphase synthetic ripple voltage generator comprising: a master clock circuit that generates a master clock signal; sequence logic that sets each of the plurality of PWM signals in sequential order based on said master clock signal; and a plurality of ripple generators, each comprising: a transconductance amplifier having an input for coupling to a corresponding one of the output inductors and an output; a ripple capacitor coupled to said output of said transconductance amplifier; and a comparator, having a first input coupled to said ripple capacitor, a second input coupled to receive an error voltage, and an output coupled to said sequence logic for resetting a corresponding one of the plurality of PWM signals.