Patent ID: 6781257
Filing Date: 2004-08-24
Classification: H02J,H02M

Abstract:
An apparatus for reducing noise from outputs of a plurality of switching regulators, wherein said plurality of switching regulators are connected in series to provide a positive output rail and a negative output rail, said apparatus comprising:a capacitor; an operational amplifier having an output connected to an inverting input of said operational amplifier and a positive sensing input of one of said plurality of switching regulators, wherein said operational amplifier includes a non-inverting input connected to said positive output rail of said plurality of switching regulators via said capacitor; a resistor connected between a positive voltage output of said one of said plurality of switching regulators and said capacitor; and a pair of diodes connected between said positive voltage output of said one of said plurality of switching regulators and said negative output rail of said plurality of switching regulators.