A voltage regulator which includes a network for improved compensation for
reference voltage changes includes an IC including an error amplifier and
a pulse width modulator (PWM), wherein an input of the PWM is coupled to
an output of the error amplifier. A low pass filter comprising an
inductor is in series with a grounded capacitor coupled to an output of
the PWM, wherein an output of the regulator (Vout) is at a node between
the inductor and the capacitor. A first feedback network is disposed
between Vout and an inverting input of the error amplifier and a second
feedback network is disposed between an output of the error amplifier and
the inverting input of the error amplifier. A current cancellation
network is coupled to the inverting input of the error amplifier. The
current cancellation network injects a canceling current into the
inverting input that is substantially equal in magnitude and opposite in
polarity to current flowing through the second feedback network triggered
by a change in reference voltage when applied to the error amplifier.