Patent ID: 7535211
Filing Date: 2009-05-19
Classification: H02M

Abstract:
1. A voltage regulator, comprising: a controller comprising error amplifier and a pulse width modulator (PWM), wherein an input of said PWM is coupled to an output of said error amplifier; an energy storage circuit coupled to an output of said PWM and an output of said regulator (Vout); a first feedback network disposed between said Vout and an inverting input of said error amplifier; a second feedback network disposed between an output of said error amplifier and said inverting input of said error amplifier, and a current cancellation network coupled to said inverting input of said error amplifier, said current cancellation network injecting a canceling current into said inverting input that is substantially equal in magnitude and opposite in polarity to current through said second feedback network triggered by a change in reference voltage applied to said error amplifier.