Patent attributes
An equivalent series inductance (ESL) cancel circuit for a regulator for adjusting a feedback voltage by attenuating a magnitude of a square wave ripple voltage developed on an output voltage. The regulator includes an output inductor and an output capacitor, in which the capacitor has an ESL which forms an inductive voltage divider with the output inductor causing the square wave voltage ripple. The ESL cancel circuit may include first and second current sources and a resistor device coupled between the output node and an adjust node which is further coupled to a feedback input of the regulator. The first current source applies a current proportional to the output voltage to the adjust node. The second current source selectively applies a current proportional to the input voltage of the regulator based on a state of the pulse control signal.
